1 | // Std |
2 | #[cfg (feature = "env" )] |
3 | use std::env; |
4 | #[cfg (feature = "env" )] |
5 | use std::ffi::OsString; |
6 | use std::{ |
7 | cmp::{Ord, Ordering}, |
8 | fmt::{self, Display, Formatter}, |
9 | str, |
10 | }; |
11 | |
12 | // Internal |
13 | use super::{ArgFlags, ArgSettings}; |
14 | use crate::builder::ArgPredicate; |
15 | use crate::builder::IntoResettable; |
16 | use crate::builder::OsStr; |
17 | use crate::builder::PossibleValue; |
18 | use crate::builder::Str; |
19 | use crate::builder::StyledStr; |
20 | use crate::builder::Styles; |
21 | use crate::builder::ValueRange; |
22 | use crate::util::AnyValueId; |
23 | use crate::ArgAction; |
24 | use crate::Id; |
25 | use crate::ValueHint; |
26 | use crate::INTERNAL_ERROR_MSG; |
27 | |
28 | /// The abstract representation of a command line argument. Used to set all the options and |
29 | /// relationships that define a valid argument for the program. |
30 | /// |
31 | /// There are two methods for constructing [`Arg`]s, using the builder pattern and setting options |
32 | /// manually, or using a usage string which is far less verbose but has fewer options. You can also |
33 | /// use a combination of the two methods to achieve the best of both worlds. |
34 | /// |
35 | /// - [Basic API][crate::Arg#basic-api] |
36 | /// - [Value Handling][crate::Arg#value-handling] |
37 | /// - [Help][crate::Arg#help-1] |
38 | /// - [Advanced Argument Relations][crate::Arg#advanced-argument-relations] |
39 | /// - [Reflection][crate::Arg#reflection] |
40 | /// |
41 | /// # Examples |
42 | /// |
43 | /// ```rust |
44 | /// # use clap_builder as clap; |
45 | /// # use clap::{Arg, arg, ArgAction}; |
46 | /// // Using the traditional builder pattern and setting each option manually |
47 | /// let cfg = Arg::new("config" ) |
48 | /// .short('c' ) |
49 | /// .long("config" ) |
50 | /// .action(ArgAction::Set) |
51 | /// .value_name("FILE" ) |
52 | /// .help("Provides a config file to myprog" ); |
53 | /// // Using a usage string (setting a similar argument to the one above) |
54 | /// let input = arg!(-i --input <FILE> "Provides an input file to the program" ); |
55 | /// ``` |
56 | #[derive (Default, Clone)] |
57 | pub struct Arg { |
58 | pub(crate) id: Id, |
59 | pub(crate) help: Option<StyledStr>, |
60 | pub(crate) long_help: Option<StyledStr>, |
61 | pub(crate) action: Option<ArgAction>, |
62 | pub(crate) value_parser: Option<super::ValueParser>, |
63 | pub(crate) blacklist: Vec<Id>, |
64 | pub(crate) settings: ArgFlags, |
65 | pub(crate) overrides: Vec<Id>, |
66 | pub(crate) groups: Vec<Id>, |
67 | pub(crate) requires: Vec<(ArgPredicate, Id)>, |
68 | pub(crate) r_ifs: Vec<(Id, OsStr)>, |
69 | pub(crate) r_ifs_all: Vec<(Id, OsStr)>, |
70 | pub(crate) r_unless: Vec<Id>, |
71 | pub(crate) r_unless_all: Vec<Id>, |
72 | pub(crate) short: Option<char>, |
73 | pub(crate) long: Option<Str>, |
74 | pub(crate) aliases: Vec<(Str, bool)>, // (name, visible) |
75 | pub(crate) short_aliases: Vec<(char, bool)>, // (name, visible) |
76 | pub(crate) disp_ord: Option<usize>, |
77 | pub(crate) val_names: Vec<Str>, |
78 | pub(crate) num_vals: Option<ValueRange>, |
79 | pub(crate) val_delim: Option<char>, |
80 | pub(crate) default_vals: Vec<OsStr>, |
81 | pub(crate) default_vals_ifs: Vec<(Id, ArgPredicate, Option<OsStr>)>, |
82 | pub(crate) default_missing_vals: Vec<OsStr>, |
83 | #[cfg (feature = "env" )] |
84 | pub(crate) env: Option<(OsStr, Option<OsString>)>, |
85 | pub(crate) terminator: Option<Str>, |
86 | pub(crate) index: Option<usize>, |
87 | pub(crate) help_heading: Option<Option<Str>>, |
88 | pub(crate) value_hint: Option<ValueHint>, |
89 | } |
90 | |
91 | /// # Basic API |
92 | impl Arg { |
93 | /// Create a new [`Arg`] with a unique name. |
94 | /// |
95 | /// The name is used to check whether or not the argument was used at |
96 | /// runtime, get values, set relationships with other args, etc.. |
97 | /// |
98 | /// **NOTE:** In the case of arguments that take values (i.e. [`Arg::action(ArgAction::Set)`]) |
99 | /// and positional arguments (i.e. those without a preceding `-` or `--`) the name will also |
100 | /// be displayed when the user prints the usage/help information of the program. |
101 | /// |
102 | /// # Examples |
103 | /// |
104 | /// ```rust |
105 | /// # use clap_builder as clap; |
106 | /// # use clap::{Command, Arg}; |
107 | /// Arg::new("config" ) |
108 | /// # ; |
109 | /// ``` |
110 | /// [`Arg::action(ArgAction::Set)`]: Arg::action() |
111 | pub fn new(id: impl Into<Id>) -> Self { |
112 | Arg::default().id(id) |
113 | } |
114 | |
115 | /// Set the identifier used for referencing this argument in the clap API. |
116 | /// |
117 | /// See [`Arg::new`] for more details. |
118 | #[must_use ] |
119 | pub fn id(mut self, id: impl Into<Id>) -> Self { |
120 | self.id = id.into(); |
121 | self |
122 | } |
123 | |
124 | /// Sets the short version of the argument without the preceding `-`. |
125 | /// |
126 | /// By default `V` and `h` are used by the auto-generated `version` and `help` arguments, |
127 | /// respectively. You will need to disable the auto-generated flags |
128 | /// ([`disable_help_flag`][crate::Command::disable_help_flag], |
129 | /// [`disable_version_flag`][crate::Command::disable_version_flag]) and define your own. |
130 | /// |
131 | /// # Examples |
132 | /// |
133 | /// When calling `short`, use a single valid UTF-8 character which will allow using the |
134 | /// argument via a single hyphen (`-`) such as `-c`: |
135 | /// |
136 | /// ```rust |
137 | /// # use clap_builder as clap; |
138 | /// # use clap::{Command, Arg, ArgAction}; |
139 | /// let m = Command::new("prog" ) |
140 | /// .arg(Arg::new("config" ) |
141 | /// .short('c' ) |
142 | /// .action(ArgAction::Set)) |
143 | /// .get_matches_from(vec![ |
144 | /// "prog" , "-c" , "file.toml" |
145 | /// ]); |
146 | /// |
147 | /// assert_eq!(m.get_one::<String>("config" ).map(String::as_str), Some("file.toml" )); |
148 | /// ``` |
149 | /// |
150 | /// To use `-h` for your own flag and still have help: |
151 | /// ```rust |
152 | /// # use clap_builder as clap; |
153 | /// # use clap::{Command, Arg, ArgAction}; |
154 | /// let m = Command::new("prog" ) |
155 | /// .disable_help_flag(true) |
156 | /// .arg(Arg::new("host" ) |
157 | /// .short('h' ) |
158 | /// .long("host" )) |
159 | /// .arg(Arg::new("help" ) |
160 | /// .long("help" ) |
161 | /// .global(true) |
162 | /// .action(ArgAction::Help)) |
163 | /// .get_matches_from(vec![ |
164 | /// "prog" , "-h" , "wikipedia.org" |
165 | /// ]); |
166 | /// |
167 | /// assert_eq!(m.get_one::<String>("host" ).map(String::as_str), Some("wikipedia.org" )); |
168 | /// ``` |
169 | #[inline ] |
170 | #[must_use ] |
171 | pub fn short(mut self, s: impl IntoResettable<char>) -> Self { |
172 | if let Some(s) = s.into_resettable().into_option() { |
173 | debug_assert!(s != '-' , "short option name cannot be `-`" ); |
174 | self.short = Some(s); |
175 | } else { |
176 | self.short = None; |
177 | } |
178 | self |
179 | } |
180 | |
181 | /// Sets the long version of the argument without the preceding `--`. |
182 | /// |
183 | /// By default `version` and `help` are used by the auto-generated `version` and `help` |
184 | /// arguments, respectively. You may use the word `version` or `help` for the long form of your |
185 | /// own arguments, in which case `clap` simply will not assign those to the auto-generated |
186 | /// `version` or `help` arguments. |
187 | /// |
188 | /// **NOTE:** Any leading `-` characters will be stripped |
189 | /// |
190 | /// # Examples |
191 | /// |
192 | /// To set `long` use a word containing valid UTF-8. If you supply a double leading |
193 | /// `--` such as `--config` they will be stripped. Hyphens in the middle of the word, however, |
194 | /// will *not* be stripped (i.e. `config-file` is allowed). |
195 | /// |
196 | /// Setting `long` allows using the argument via a double hyphen (`--`) such as `--config` |
197 | /// |
198 | /// ```rust |
199 | /// # use clap_builder as clap; |
200 | /// # use clap::{Command, Arg, ArgAction}; |
201 | /// let m = Command::new("prog" ) |
202 | /// .arg(Arg::new("cfg" ) |
203 | /// .long("config" ) |
204 | /// .action(ArgAction::Set)) |
205 | /// .get_matches_from(vec![ |
206 | /// "prog" , "--config" , "file.toml" |
207 | /// ]); |
208 | /// |
209 | /// assert_eq!(m.get_one::<String>("cfg" ).map(String::as_str), Some("file.toml" )); |
210 | /// ``` |
211 | #[inline ] |
212 | #[must_use ] |
213 | pub fn long(mut self, l: impl IntoResettable<Str>) -> Self { |
214 | self.long = l.into_resettable().into_option(); |
215 | self |
216 | } |
217 | |
218 | /// Add an alias, which functions as a hidden long flag. |
219 | /// |
220 | /// This is more efficient, and easier than creating multiple hidden arguments as one only |
221 | /// needs to check for the existence of this command, and not all variants. |
222 | /// |
223 | /// # Examples |
224 | /// |
225 | /// ```rust |
226 | /// # use clap_builder as clap; |
227 | /// # use clap::{Command, Arg, ArgAction}; |
228 | /// let m = Command::new("prog" ) |
229 | /// .arg(Arg::new("test" ) |
230 | /// .long("test" ) |
231 | /// .alias("alias" ) |
232 | /// .action(ArgAction::Set)) |
233 | /// .get_matches_from(vec![ |
234 | /// "prog" , "--alias" , "cool" |
235 | /// ]); |
236 | /// assert_eq!(m.get_one::<String>("test" ).unwrap(), "cool" ); |
237 | /// ``` |
238 | #[must_use ] |
239 | pub fn alias(mut self, name: impl IntoResettable<Str>) -> Self { |
240 | if let Some(name) = name.into_resettable().into_option() { |
241 | self.aliases.push((name, false)); |
242 | } else { |
243 | self.aliases.clear(); |
244 | } |
245 | self |
246 | } |
247 | |
248 | /// Add an alias, which functions as a hidden short flag. |
249 | /// |
250 | /// This is more efficient, and easier than creating multiple hidden arguments as one only |
251 | /// needs to check for the existence of this command, and not all variants. |
252 | /// |
253 | /// # Examples |
254 | /// |
255 | /// ```rust |
256 | /// # use clap_builder as clap; |
257 | /// # use clap::{Command, Arg, ArgAction}; |
258 | /// let m = Command::new("prog" ) |
259 | /// .arg(Arg::new("test" ) |
260 | /// .short('t' ) |
261 | /// .short_alias('e' ) |
262 | /// .action(ArgAction::Set)) |
263 | /// .get_matches_from(vec![ |
264 | /// "prog" , "-e" , "cool" |
265 | /// ]); |
266 | /// assert_eq!(m.get_one::<String>("test" ).unwrap(), "cool" ); |
267 | /// ``` |
268 | #[must_use ] |
269 | pub fn short_alias(mut self, name: impl IntoResettable<char>) -> Self { |
270 | if let Some(name) = name.into_resettable().into_option() { |
271 | debug_assert!(name != '-' , "short alias name cannot be `-`" ); |
272 | self.short_aliases.push((name, false)); |
273 | } else { |
274 | self.short_aliases.clear(); |
275 | } |
276 | self |
277 | } |
278 | |
279 | /// Add aliases, which function as hidden long flags. |
280 | /// |
281 | /// This is more efficient, and easier than creating multiple hidden subcommands as one only |
282 | /// needs to check for the existence of this command, and not all variants. |
283 | /// |
284 | /// # Examples |
285 | /// |
286 | /// ```rust |
287 | /// # use clap_builder as clap; |
288 | /// # use clap::{Command, Arg, ArgAction}; |
289 | /// let m = Command::new("prog" ) |
290 | /// .arg(Arg::new("test" ) |
291 | /// .long("test" ) |
292 | /// .aliases(["do-stuff" , "do-tests" , "tests" ]) |
293 | /// .action(ArgAction::SetTrue) |
294 | /// .help("the file to add" ) |
295 | /// .required(false)) |
296 | /// .get_matches_from(vec![ |
297 | /// "prog" , "--do-tests" |
298 | /// ]); |
299 | /// assert_eq!(m.get_flag("test" ), true); |
300 | /// ``` |
301 | #[must_use ] |
302 | pub fn aliases(mut self, names: impl IntoIterator<Item = impl Into<Str>>) -> Self { |
303 | self.aliases |
304 | .extend(names.into_iter().map(|x| (x.into(), false))); |
305 | self |
306 | } |
307 | |
308 | /// Add aliases, which functions as a hidden short flag. |
309 | /// |
310 | /// This is more efficient, and easier than creating multiple hidden subcommands as one only |
311 | /// needs to check for the existence of this command, and not all variants. |
312 | /// |
313 | /// # Examples |
314 | /// |
315 | /// ```rust |
316 | /// # use clap_builder as clap; |
317 | /// # use clap::{Command, Arg, ArgAction}; |
318 | /// let m = Command::new("prog" ) |
319 | /// .arg(Arg::new("test" ) |
320 | /// .short('t' ) |
321 | /// .short_aliases(['e' , 's' ]) |
322 | /// .action(ArgAction::SetTrue) |
323 | /// .help("the file to add" ) |
324 | /// .required(false)) |
325 | /// .get_matches_from(vec![ |
326 | /// "prog" , "-s" |
327 | /// ]); |
328 | /// assert_eq!(m.get_flag("test" ), true); |
329 | /// ``` |
330 | #[must_use ] |
331 | pub fn short_aliases(mut self, names: impl IntoIterator<Item = char>) -> Self { |
332 | for s in names { |
333 | debug_assert!(s != '-' , "short alias name cannot be `-`" ); |
334 | self.short_aliases.push((s, false)); |
335 | } |
336 | self |
337 | } |
338 | |
339 | /// Add an alias, which functions as a visible long flag. |
340 | /// |
341 | /// Like [`Arg::alias`], except that they are visible inside the help message. |
342 | /// |
343 | /// # Examples |
344 | /// |
345 | /// ```rust |
346 | /// # use clap_builder as clap; |
347 | /// # use clap::{Command, Arg, ArgAction}; |
348 | /// let m = Command::new("prog" ) |
349 | /// .arg(Arg::new("test" ) |
350 | /// .visible_alias("something-awesome" ) |
351 | /// .long("test" ) |
352 | /// .action(ArgAction::Set)) |
353 | /// .get_matches_from(vec![ |
354 | /// "prog" , "--something-awesome" , "coffee" |
355 | /// ]); |
356 | /// assert_eq!(m.get_one::<String>("test" ).unwrap(), "coffee" ); |
357 | /// ``` |
358 | /// [`Command::alias`]: Arg::alias() |
359 | #[must_use ] |
360 | pub fn visible_alias(mut self, name: impl IntoResettable<Str>) -> Self { |
361 | if let Some(name) = name.into_resettable().into_option() { |
362 | self.aliases.push((name, true)); |
363 | } else { |
364 | self.aliases.clear(); |
365 | } |
366 | self |
367 | } |
368 | |
369 | /// Add an alias, which functions as a visible short flag. |
370 | /// |
371 | /// Like [`Arg::short_alias`], except that they are visible inside the help message. |
372 | /// |
373 | /// # Examples |
374 | /// |
375 | /// ```rust |
376 | /// # use clap_builder as clap; |
377 | /// # use clap::{Command, Arg, ArgAction}; |
378 | /// let m = Command::new("prog" ) |
379 | /// .arg(Arg::new("test" ) |
380 | /// .long("test" ) |
381 | /// .visible_short_alias('t' ) |
382 | /// .action(ArgAction::Set)) |
383 | /// .get_matches_from(vec![ |
384 | /// "prog" , "-t" , "coffee" |
385 | /// ]); |
386 | /// assert_eq!(m.get_one::<String>("test" ).unwrap(), "coffee" ); |
387 | /// ``` |
388 | #[must_use ] |
389 | pub fn visible_short_alias(mut self, name: impl IntoResettable<char>) -> Self { |
390 | if let Some(name) = name.into_resettable().into_option() { |
391 | debug_assert!(name != '-' , "short alias name cannot be `-`" ); |
392 | self.short_aliases.push((name, true)); |
393 | } else { |
394 | self.short_aliases.clear(); |
395 | } |
396 | self |
397 | } |
398 | |
399 | /// Add aliases, which function as visible long flags. |
400 | /// |
401 | /// Like [`Arg::aliases`], except that they are visible inside the help message. |
402 | /// |
403 | /// # Examples |
404 | /// |
405 | /// ```rust |
406 | /// # use clap_builder as clap; |
407 | /// # use clap::{Command, Arg, ArgAction}; |
408 | /// let m = Command::new("prog" ) |
409 | /// .arg(Arg::new("test" ) |
410 | /// .long("test" ) |
411 | /// .action(ArgAction::SetTrue) |
412 | /// .visible_aliases(["something" , "awesome" , "cool" ])) |
413 | /// .get_matches_from(vec![ |
414 | /// "prog" , "--awesome" |
415 | /// ]); |
416 | /// assert_eq!(m.get_flag("test" ), true); |
417 | /// ``` |
418 | /// [`Command::aliases`]: Arg::aliases() |
419 | #[must_use ] |
420 | pub fn visible_aliases(mut self, names: impl IntoIterator<Item = impl Into<Str>>) -> Self { |
421 | self.aliases |
422 | .extend(names.into_iter().map(|n| (n.into(), true))); |
423 | self |
424 | } |
425 | |
426 | /// Add aliases, which function as visible short flags. |
427 | /// |
428 | /// Like [`Arg::short_aliases`], except that they are visible inside the help message. |
429 | /// |
430 | /// # Examples |
431 | /// |
432 | /// ```rust |
433 | /// # use clap_builder as clap; |
434 | /// # use clap::{Command, Arg, ArgAction}; |
435 | /// let m = Command::new("prog" ) |
436 | /// .arg(Arg::new("test" ) |
437 | /// .long("test" ) |
438 | /// .action(ArgAction::SetTrue) |
439 | /// .visible_short_aliases(['t' , 'e' ])) |
440 | /// .get_matches_from(vec![ |
441 | /// "prog" , "-t" |
442 | /// ]); |
443 | /// assert_eq!(m.get_flag("test" ), true); |
444 | /// ``` |
445 | #[must_use ] |
446 | pub fn visible_short_aliases(mut self, names: impl IntoIterator<Item = char>) -> Self { |
447 | for n in names { |
448 | debug_assert!(n != '-' , "short alias name cannot be `-`" ); |
449 | self.short_aliases.push((n, true)); |
450 | } |
451 | self |
452 | } |
453 | |
454 | /// Specifies the index of a positional argument **starting at** 1. |
455 | /// |
456 | /// **NOTE:** The index refers to position according to **other positional argument**. It does |
457 | /// not define position in the argument list as a whole. |
458 | /// |
459 | /// **NOTE:** You can optionally leave off the `index` method, and the index will be |
460 | /// assigned in order of evaluation. Utilizing the `index` method allows for setting |
461 | /// indexes out of order |
462 | /// |
463 | /// **NOTE:** This is only meant to be used for positional arguments and shouldn't to be used |
464 | /// with [`Arg::short`] or [`Arg::long`]. |
465 | /// |
466 | /// **NOTE:** When utilized with [`Arg::num_args(1..)`], only the **last** positional argument |
467 | /// may be defined as having a variable number of arguments (i.e. with the highest index) |
468 | /// |
469 | /// # Panics |
470 | /// |
471 | /// [`Command`] will [`panic!`] if indexes are skipped (such as defining `index(1)` and `index(3)` |
472 | /// but not `index(2)`, or a positional argument is defined as multiple and is not the highest |
473 | /// index |
474 | /// |
475 | /// # Examples |
476 | /// |
477 | /// ```rust |
478 | /// # use clap_builder as clap; |
479 | /// # use clap::{Command, Arg}; |
480 | /// Arg::new("config" ) |
481 | /// .index(1) |
482 | /// # ; |
483 | /// ``` |
484 | /// |
485 | /// ```rust |
486 | /// # use clap_builder as clap; |
487 | /// # use clap::{Command, Arg, ArgAction}; |
488 | /// let m = Command::new("prog" ) |
489 | /// .arg(Arg::new("mode" ) |
490 | /// .index(1)) |
491 | /// .arg(Arg::new("debug" ) |
492 | /// .long("debug" ) |
493 | /// .action(ArgAction::SetTrue)) |
494 | /// .get_matches_from(vec![ |
495 | /// "prog" , "--debug" , "fast" |
496 | /// ]); |
497 | /// |
498 | /// assert!(m.contains_id("mode" )); |
499 | /// assert_eq!(m.get_one::<String>("mode" ).unwrap(), "fast" ); // notice index(1) means "first positional" |
500 | /// // *not* first argument |
501 | /// ``` |
502 | /// [`Arg::short`]: Arg::short() |
503 | /// [`Arg::long`]: Arg::long() |
504 | /// [`Arg::num_args(true)`]: Arg::num_args() |
505 | /// [`Command`]: crate::Command |
506 | #[inline ] |
507 | #[must_use ] |
508 | pub fn index(mut self, idx: impl IntoResettable<usize>) -> Self { |
509 | self.index = idx.into_resettable().into_option(); |
510 | self |
511 | } |
512 | |
513 | /// This is a "VarArg" and everything that follows should be captured by it, as if the user had |
514 | /// used a `--`. |
515 | /// |
516 | /// **NOTE:** To start the trailing "VarArg" on unknown flags (and not just a positional |
517 | /// value), set [`allow_hyphen_values`][Arg::allow_hyphen_values]. Either way, users still |
518 | /// have the option to explicitly escape ambiguous arguments with `--`. |
519 | /// |
520 | /// **NOTE:** [`Arg::value_delimiter`] still applies if set. |
521 | /// |
522 | /// **NOTE:** Setting this requires [`Arg::num_args(..)`]. |
523 | /// |
524 | /// # Examples |
525 | /// |
526 | /// ```rust |
527 | /// # use clap_builder as clap; |
528 | /// # use clap::{Command, arg}; |
529 | /// let m = Command::new("myprog" ) |
530 | /// .arg(arg!(<cmd> ... "commands to run" ).trailing_var_arg(true)) |
531 | /// .get_matches_from(vec!["myprog" , "arg1" , "-r" , "val1" ]); |
532 | /// |
533 | /// let trail: Vec<_> = m.get_many::<String>("cmd" ).unwrap().collect(); |
534 | /// assert_eq!(trail, ["arg1" , "-r" , "val1" ]); |
535 | /// ``` |
536 | /// [`Arg::num_args(..)`]: crate::Arg::num_args() |
537 | pub fn trailing_var_arg(self, yes: bool) -> Self { |
538 | if yes { |
539 | self.setting(ArgSettings::TrailingVarArg) |
540 | } else { |
541 | self.unset_setting(ArgSettings::TrailingVarArg) |
542 | } |
543 | } |
544 | |
545 | /// This arg is the last, or final, positional argument (i.e. has the highest |
546 | /// index) and is *only* able to be accessed via the `--` syntax (i.e. `$ prog args -- |
547 | /// last_arg`). |
548 | /// |
549 | /// Even, if no other arguments are left to parse, if the user omits the `--` syntax |
550 | /// they will receive an [`UnknownArgument`] error. Setting an argument to `.last(true)` also |
551 | /// allows one to access this arg early using the `--` syntax. Accessing an arg early, even with |
552 | /// the `--` syntax is otherwise not possible. |
553 | /// |
554 | /// **NOTE:** This will change the usage string to look like `$ prog [OPTIONS] [-- <ARG>]` if |
555 | /// `ARG` is marked as `.last(true)`. |
556 | /// |
557 | /// **NOTE:** This setting will imply [`crate::Command::dont_collapse_args_in_usage`] because failing |
558 | /// to set this can make the usage string very confusing. |
559 | /// |
560 | /// **NOTE**: This setting only applies to positional arguments, and has no effect on OPTIONS |
561 | /// |
562 | /// **NOTE:** Setting this requires [taking values][Arg::num_args] |
563 | /// |
564 | /// **CAUTION:** Using this setting *and* having child subcommands is not |
565 | /// recommended with the exception of *also* using |
566 | /// [`crate::Command::args_conflicts_with_subcommands`] |
567 | /// (or [`crate::Command::subcommand_negates_reqs`] if the argument marked `Last` is also |
568 | /// marked [`Arg::required`]) |
569 | /// |
570 | /// # Examples |
571 | /// |
572 | /// ```rust |
573 | /// # use clap_builder as clap; |
574 | /// # use clap::{Arg, ArgAction}; |
575 | /// Arg::new("args" ) |
576 | /// .action(ArgAction::Set) |
577 | /// .last(true) |
578 | /// # ; |
579 | /// ``` |
580 | /// |
581 | /// Setting `last` ensures the arg has the highest [index] of all positional args |
582 | /// and requires that the `--` syntax be used to access it early. |
583 | /// |
584 | /// ```rust |
585 | /// # use clap_builder as clap; |
586 | /// # use clap::{Command, Arg, ArgAction}; |
587 | /// let res = Command::new("prog" ) |
588 | /// .arg(Arg::new("first" )) |
589 | /// .arg(Arg::new("second" )) |
590 | /// .arg(Arg::new("third" ) |
591 | /// .action(ArgAction::Set) |
592 | /// .last(true)) |
593 | /// .try_get_matches_from(vec![ |
594 | /// "prog" , "one" , "--" , "three" |
595 | /// ]); |
596 | /// |
597 | /// assert!(res.is_ok()); |
598 | /// let m = res.unwrap(); |
599 | /// assert_eq!(m.get_one::<String>("third" ).unwrap(), "three" ); |
600 | /// assert_eq!(m.get_one::<String>("second" ), None); |
601 | /// ``` |
602 | /// |
603 | /// Even if the positional argument marked `Last` is the only argument left to parse, |
604 | /// failing to use the `--` syntax results in an error. |
605 | /// |
606 | /// ```rust |
607 | /// # use clap_builder as clap; |
608 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
609 | /// let res = Command::new("prog" ) |
610 | /// .arg(Arg::new("first" )) |
611 | /// .arg(Arg::new("second" )) |
612 | /// .arg(Arg::new("third" ) |
613 | /// .action(ArgAction::Set) |
614 | /// .last(true)) |
615 | /// .try_get_matches_from(vec![ |
616 | /// "prog" , "one" , "two" , "three" |
617 | /// ]); |
618 | /// |
619 | /// assert!(res.is_err()); |
620 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::UnknownArgument); |
621 | /// ``` |
622 | /// [index]: Arg::index() |
623 | /// [`UnknownArgument`]: crate::error::ErrorKind::UnknownArgument |
624 | #[inline ] |
625 | #[must_use ] |
626 | pub fn last(self, yes: bool) -> Self { |
627 | if yes { |
628 | self.setting(ArgSettings::Last) |
629 | } else { |
630 | self.unset_setting(ArgSettings::Last) |
631 | } |
632 | } |
633 | |
634 | /// Specifies that the argument must be present. |
635 | /// |
636 | /// Required by default means it is required, when no other conflicting rules or overrides have |
637 | /// been evaluated. Conflicting rules take precedence over being required. |
638 | /// |
639 | /// **Pro tip:** Flags (i.e. not positional, or arguments that take values) shouldn't be |
640 | /// required by default. This is because if a flag were to be required, it should simply be |
641 | /// implied. No additional information is required from user. Flags by their very nature are |
642 | /// simply boolean on/off switches. The only time a user *should* be required to use a flag |
643 | /// is if the operation is destructive in nature, and the user is essentially proving to you, |
644 | /// "Yes, I know what I'm doing." |
645 | /// |
646 | /// # Examples |
647 | /// |
648 | /// ```rust |
649 | /// # use clap_builder as clap; |
650 | /// # use clap::Arg; |
651 | /// Arg::new("config" ) |
652 | /// .required(true) |
653 | /// # ; |
654 | /// ``` |
655 | /// |
656 | /// Setting required requires that the argument be used at runtime. |
657 | /// |
658 | /// ```rust |
659 | /// # use clap_builder as clap; |
660 | /// # use clap::{Command, Arg, ArgAction}; |
661 | /// let res = Command::new("prog" ) |
662 | /// .arg(Arg::new("cfg" ) |
663 | /// .required(true) |
664 | /// .action(ArgAction::Set) |
665 | /// .long("config" )) |
666 | /// .try_get_matches_from(vec![ |
667 | /// "prog" , "--config" , "file.conf" , |
668 | /// ]); |
669 | /// |
670 | /// assert!(res.is_ok()); |
671 | /// ``` |
672 | /// |
673 | /// Setting required and then *not* supplying that argument at runtime is an error. |
674 | /// |
675 | /// ```rust |
676 | /// # use clap_builder as clap; |
677 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
678 | /// let res = Command::new("prog" ) |
679 | /// .arg(Arg::new("cfg" ) |
680 | /// .required(true) |
681 | /// .action(ArgAction::Set) |
682 | /// .long("config" )) |
683 | /// .try_get_matches_from(vec![ |
684 | /// "prog" |
685 | /// ]); |
686 | /// |
687 | /// assert!(res.is_err()); |
688 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
689 | /// ``` |
690 | #[inline ] |
691 | #[must_use ] |
692 | pub fn required(self, yes: bool) -> Self { |
693 | if yes { |
694 | self.setting(ArgSettings::Required) |
695 | } else { |
696 | self.unset_setting(ArgSettings::Required) |
697 | } |
698 | } |
699 | |
700 | /// Sets an argument that is required when this one is present |
701 | /// |
702 | /// i.e. when using this argument, the following argument *must* be present. |
703 | /// |
704 | /// **NOTE:** [Conflicting] rules and [override] rules take precedence over being required |
705 | /// |
706 | /// # Examples |
707 | /// |
708 | /// ```rust |
709 | /// # use clap_builder as clap; |
710 | /// # use clap::Arg; |
711 | /// Arg::new("config" ) |
712 | /// .requires("input" ) |
713 | /// # ; |
714 | /// ``` |
715 | /// |
716 | /// Setting [`Arg::requires(name)`] requires that the argument be used at runtime if the |
717 | /// defining argument is used. If the defining argument isn't used, the other argument isn't |
718 | /// required |
719 | /// |
720 | /// ```rust |
721 | /// # use clap_builder as clap; |
722 | /// # use clap::{Command, Arg, ArgAction}; |
723 | /// let res = Command::new("prog" ) |
724 | /// .arg(Arg::new("cfg" ) |
725 | /// .action(ArgAction::Set) |
726 | /// .requires("input" ) |
727 | /// .long("config" )) |
728 | /// .arg(Arg::new("input" )) |
729 | /// .try_get_matches_from(vec![ |
730 | /// "prog" |
731 | /// ]); |
732 | /// |
733 | /// assert!(res.is_ok()); // We didn't use cfg, so input wasn't required |
734 | /// ``` |
735 | /// |
736 | /// Setting [`Arg::requires(name)`] and *not* supplying that argument is an error. |
737 | /// |
738 | /// ```rust |
739 | /// # use clap_builder as clap; |
740 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
741 | /// let res = Command::new("prog" ) |
742 | /// .arg(Arg::new("cfg" ) |
743 | /// .action(ArgAction::Set) |
744 | /// .requires("input" ) |
745 | /// .long("config" )) |
746 | /// .arg(Arg::new("input" )) |
747 | /// .try_get_matches_from(vec![ |
748 | /// "prog" , "--config" , "file.conf" |
749 | /// ]); |
750 | /// |
751 | /// assert!(res.is_err()); |
752 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
753 | /// ``` |
754 | /// [`Arg::requires(name)`]: Arg::requires() |
755 | /// [Conflicting]: Arg::conflicts_with() |
756 | /// [override]: Arg::overrides_with() |
757 | #[must_use ] |
758 | pub fn requires(mut self, arg_id: impl IntoResettable<Id>) -> Self { |
759 | if let Some(arg_id) = arg_id.into_resettable().into_option() { |
760 | self.requires.push((ArgPredicate::IsPresent, arg_id)); |
761 | } else { |
762 | self.requires.clear(); |
763 | } |
764 | self |
765 | } |
766 | |
767 | /// This argument must be passed alone; it conflicts with all other arguments. |
768 | /// |
769 | /// # Examples |
770 | /// |
771 | /// ```rust |
772 | /// # use clap_builder as clap; |
773 | /// # use clap::Arg; |
774 | /// Arg::new("config" ) |
775 | /// .exclusive(true) |
776 | /// # ; |
777 | /// ``` |
778 | /// |
779 | /// Setting an exclusive argument and having any other arguments present at runtime |
780 | /// is an error. |
781 | /// |
782 | /// ```rust |
783 | /// # use clap_builder as clap; |
784 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
785 | /// let res = Command::new("prog" ) |
786 | /// .arg(Arg::new("exclusive" ) |
787 | /// .action(ArgAction::Set) |
788 | /// .exclusive(true) |
789 | /// .long("exclusive" )) |
790 | /// .arg(Arg::new("debug" ) |
791 | /// .long("debug" )) |
792 | /// .arg(Arg::new("input" )) |
793 | /// .try_get_matches_from(vec![ |
794 | /// "prog" , "--exclusive" , "file.conf" , "file.txt" |
795 | /// ]); |
796 | /// |
797 | /// assert!(res.is_err()); |
798 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::ArgumentConflict); |
799 | /// ``` |
800 | #[inline ] |
801 | #[must_use ] |
802 | pub fn exclusive(self, yes: bool) -> Self { |
803 | if yes { |
804 | self.setting(ArgSettings::Exclusive) |
805 | } else { |
806 | self.unset_setting(ArgSettings::Exclusive) |
807 | } |
808 | } |
809 | |
810 | /// Specifies that an argument can be matched to all child [`Subcommand`]s. |
811 | /// |
812 | /// **NOTE:** Global arguments *only* propagate down, **not** up (to parent commands), however |
813 | /// their values once a user uses them will be propagated back up to parents. In effect, this |
814 | /// means one should *define* all global arguments at the top level, however it doesn't matter |
815 | /// where the user *uses* the global argument. |
816 | /// |
817 | /// # Examples |
818 | /// |
819 | /// Assume an application with two subcommands, and you'd like to define a |
820 | /// `--verbose` flag that can be called on any of the subcommands and parent, but you don't |
821 | /// want to clutter the source with three duplicate [`Arg`] definitions. |
822 | /// |
823 | /// ```rust |
824 | /// # use clap_builder as clap; |
825 | /// # use clap::{Command, Arg, ArgAction}; |
826 | /// let m = Command::new("prog" ) |
827 | /// .arg(Arg::new("verb" ) |
828 | /// .long("verbose" ) |
829 | /// .short('v' ) |
830 | /// .action(ArgAction::SetTrue) |
831 | /// .global(true)) |
832 | /// .subcommand(Command::new("test" )) |
833 | /// .subcommand(Command::new("do-stuff" )) |
834 | /// .get_matches_from(vec![ |
835 | /// "prog" , "do-stuff" , "--verbose" |
836 | /// ]); |
837 | /// |
838 | /// assert_eq!(m.subcommand_name(), Some("do-stuff" )); |
839 | /// let sub_m = m.subcommand_matches("do-stuff" ).unwrap(); |
840 | /// assert_eq!(sub_m.get_flag("verb" ), true); |
841 | /// ``` |
842 | /// |
843 | /// [`Subcommand`]: crate::Subcommand |
844 | #[inline ] |
845 | #[must_use ] |
846 | pub fn global(self, yes: bool) -> Self { |
847 | if yes { |
848 | self.setting(ArgSettings::Global) |
849 | } else { |
850 | self.unset_setting(ArgSettings::Global) |
851 | } |
852 | } |
853 | |
854 | #[inline ] |
855 | pub(crate) fn is_set(&self, s: ArgSettings) -> bool { |
856 | self.settings.is_set(s) |
857 | } |
858 | |
859 | #[inline ] |
860 | #[must_use ] |
861 | pub(crate) fn setting(mut self, setting: ArgSettings) -> Self { |
862 | self.settings.set(setting); |
863 | self |
864 | } |
865 | |
866 | #[inline ] |
867 | #[must_use ] |
868 | pub(crate) fn unset_setting(mut self, setting: ArgSettings) -> Self { |
869 | self.settings.unset(setting); |
870 | self |
871 | } |
872 | } |
873 | |
874 | /// # Value Handling |
875 | impl Arg { |
876 | /// Specify how to react to an argument when parsing it. |
877 | /// |
878 | /// [ArgAction][crate::ArgAction] controls things like |
879 | /// - Overwriting previous values with new ones |
880 | /// - Appending new values to all previous ones |
881 | /// - Counting how many times a flag occurs |
882 | /// |
883 | /// The default action is `ArgAction::Set` |
884 | /// |
885 | /// # Examples |
886 | /// |
887 | /// ```rust |
888 | /// # use clap_builder as clap; |
889 | /// # use clap::Command; |
890 | /// # use clap::Arg; |
891 | /// let cmd = Command::new("mycmd" ) |
892 | /// .arg( |
893 | /// Arg::new("flag" ) |
894 | /// .long("flag" ) |
895 | /// .action(clap::ArgAction::Append) |
896 | /// ); |
897 | /// |
898 | /// let matches = cmd.try_get_matches_from(["mycmd" , "--flag" , "value" ]).unwrap(); |
899 | /// assert!(matches.contains_id("flag" )); |
900 | /// assert_eq!( |
901 | /// matches.get_many::<String>("flag" ).unwrap_or_default().map(|v| v.as_str()).collect::<Vec<_>>(), |
902 | /// vec!["value" ] |
903 | /// ); |
904 | /// ``` |
905 | #[inline ] |
906 | #[must_use ] |
907 | pub fn action(mut self, action: impl IntoResettable<ArgAction>) -> Self { |
908 | self.action = action.into_resettable().into_option(); |
909 | self |
910 | } |
911 | |
912 | /// Specify the typed behavior of the argument. |
913 | /// |
914 | /// This allows parsing and validating a value before storing it into |
915 | /// [`ArgMatches`][crate::ArgMatches] as the given type. |
916 | /// |
917 | /// Possible value parsers include: |
918 | /// - [`value_parser!(T)`][crate::value_parser!] for auto-selecting a value parser for a given type |
919 | /// - Or [range expressions like `0..=1`][std::ops::RangeBounds] as a shorthand for [`RangedI64ValueParser`][crate::builder::RangedI64ValueParser] |
920 | /// - `Fn(&str) -> Result<T, E>` |
921 | /// - `[&str]` and [`PossibleValuesParser`][crate::builder::PossibleValuesParser] for static enumerated values |
922 | /// - [`BoolishValueParser`][crate::builder::BoolishValueParser], and [`FalseyValueParser`][crate::builder::FalseyValueParser] for alternative `bool` implementations |
923 | /// - [`NonEmptyStringValueParser`][crate::builder::NonEmptyStringValueParser] for basic validation for strings |
924 | /// - or any other [`TypedValueParser`][crate::builder::TypedValueParser] implementation |
925 | /// |
926 | /// The default value is [`ValueParser::string`][crate::builder::ValueParser::string]. |
927 | /// |
928 | /// ```rust |
929 | /// # use clap_builder as clap; |
930 | /// # use clap::ArgAction; |
931 | /// let mut cmd = clap::Command::new("raw" ) |
932 | /// .arg( |
933 | /// clap::Arg::new("color" ) |
934 | /// .long("color" ) |
935 | /// .value_parser(["always" , "auto" , "never" ]) |
936 | /// .default_value("auto" ) |
937 | /// ) |
938 | /// .arg( |
939 | /// clap::Arg::new("hostname" ) |
940 | /// .long("hostname" ) |
941 | /// .value_parser(clap::builder::NonEmptyStringValueParser::new()) |
942 | /// .action(ArgAction::Set) |
943 | /// .required(true) |
944 | /// ) |
945 | /// .arg( |
946 | /// clap::Arg::new("port" ) |
947 | /// .long("port" ) |
948 | /// .value_parser(clap::value_parser!(u16).range(3000..)) |
949 | /// .action(ArgAction::Set) |
950 | /// .required(true) |
951 | /// ); |
952 | /// |
953 | /// let m = cmd.try_get_matches_from_mut( |
954 | /// ["cmd" , "--hostname" , "rust-lang.org" , "--port" , "3001" ] |
955 | /// ).unwrap(); |
956 | /// |
957 | /// let color: &String = m.get_one("color" ) |
958 | /// .expect("default" ); |
959 | /// assert_eq!(color, "auto" ); |
960 | /// |
961 | /// let hostname: &String = m.get_one("hostname" ) |
962 | /// .expect("required" ); |
963 | /// assert_eq!(hostname, "rust-lang.org" ); |
964 | /// |
965 | /// let port: u16 = *m.get_one("port" ) |
966 | /// .expect("required" ); |
967 | /// assert_eq!(port, 3001); |
968 | /// ``` |
969 | pub fn value_parser(mut self, parser: impl IntoResettable<super::ValueParser>) -> Self { |
970 | self.value_parser = parser.into_resettable().into_option(); |
971 | self |
972 | } |
973 | |
974 | /// Specifies the number of arguments parsed per occurrence |
975 | /// |
976 | /// For example, if you had a `-f <file>` argument where you wanted exactly 3 'files' you would |
977 | /// set `.num_args(3)`, and this argument wouldn't be satisfied unless the user |
978 | /// provided 3 and only 3 values. |
979 | /// |
980 | /// Users may specify values for arguments in any of the following methods |
981 | /// |
982 | /// - Using a space such as `-o value` or `--option value` |
983 | /// - Using an equals and no space such as `-o=value` or `--option=value` |
984 | /// - Use a short and no space such as `-ovalue` |
985 | /// |
986 | /// **WARNING:** |
987 | /// |
988 | /// Setting a variable number of values (e.g. `1..=10`) for an argument without |
989 | /// other details can be dangerous in some circumstances. Because multiple values are |
990 | /// allowed, `--option val1 val2 val3` is perfectly valid. Be careful when designing a CLI |
991 | /// where **positional arguments** or **subcommands** are *also* expected as `clap` will continue |
992 | /// parsing *values* until one of the following happens: |
993 | /// |
994 | /// - It reaches the maximum number of values |
995 | /// - It reaches a specific number of values |
996 | /// - It finds another flag or option (i.e. something that starts with a `-`) |
997 | /// - It reaches the [`Arg::value_terminator`] if set |
998 | /// |
999 | /// Alternatively, |
1000 | /// - Use a delimiter between values with [Arg::value_delimiter] |
1001 | /// - Require a flag occurrence per value with [`ArgAction::Append`] |
1002 | /// - Require positional arguments to appear after `--` with [`Arg::last`] |
1003 | /// |
1004 | /// # Examples |
1005 | /// |
1006 | /// Option: |
1007 | /// ```rust |
1008 | /// # use clap_builder as clap; |
1009 | /// # use clap::{Command, Arg}; |
1010 | /// let m = Command::new("prog" ) |
1011 | /// .arg(Arg::new("mode" ) |
1012 | /// .long("mode" ) |
1013 | /// .num_args(1)) |
1014 | /// .get_matches_from(vec![ |
1015 | /// "prog" , "--mode" , "fast" |
1016 | /// ]); |
1017 | /// |
1018 | /// assert_eq!(m.get_one::<String>("mode" ).unwrap(), "fast" ); |
1019 | /// ``` |
1020 | /// |
1021 | /// Flag/option hybrid (see also [default_missing_value][Arg::default_missing_value]) |
1022 | /// ```rust |
1023 | /// # use clap_builder as clap; |
1024 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
1025 | /// let cmd = Command::new("prog" ) |
1026 | /// .arg(Arg::new("mode" ) |
1027 | /// .long("mode" ) |
1028 | /// .default_missing_value("slow" ) |
1029 | /// .default_value("plaid" ) |
1030 | /// .num_args(0..=1)); |
1031 | /// |
1032 | /// let m = cmd.clone() |
1033 | /// .get_matches_from(vec![ |
1034 | /// "prog" , "--mode" , "fast" |
1035 | /// ]); |
1036 | /// assert_eq!(m.get_one::<String>("mode" ).unwrap(), "fast" ); |
1037 | /// |
1038 | /// let m = cmd.clone() |
1039 | /// .get_matches_from(vec![ |
1040 | /// "prog" , "--mode" , |
1041 | /// ]); |
1042 | /// assert_eq!(m.get_one::<String>("mode" ).unwrap(), "slow" ); |
1043 | /// |
1044 | /// let m = cmd.clone() |
1045 | /// .get_matches_from(vec![ |
1046 | /// "prog" , |
1047 | /// ]); |
1048 | /// assert_eq!(m.get_one::<String>("mode" ).unwrap(), "plaid" ); |
1049 | /// ``` |
1050 | /// |
1051 | /// Tuples |
1052 | /// ```rust |
1053 | /// # use clap_builder as clap; |
1054 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
1055 | /// let cmd = Command::new("prog" ) |
1056 | /// .arg(Arg::new("file" ) |
1057 | /// .action(ArgAction::Set) |
1058 | /// .num_args(2) |
1059 | /// .short('F' )); |
1060 | /// |
1061 | /// let m = cmd.clone() |
1062 | /// .get_matches_from(vec![ |
1063 | /// "prog" , "-F" , "in-file" , "out-file" |
1064 | /// ]); |
1065 | /// assert_eq!( |
1066 | /// m.get_many::<String>("file" ).unwrap_or_default().map(|v| v.as_str()).collect::<Vec<_>>(), |
1067 | /// vec!["in-file" , "out-file" ] |
1068 | /// ); |
1069 | /// |
1070 | /// let res = cmd.clone() |
1071 | /// .try_get_matches_from(vec![ |
1072 | /// "prog" , "-F" , "file1" |
1073 | /// ]); |
1074 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::WrongNumberOfValues); |
1075 | /// ``` |
1076 | /// |
1077 | /// A common mistake is to define an option which allows multiple values and a positional |
1078 | /// argument. |
1079 | /// ```rust |
1080 | /// # use clap_builder as clap; |
1081 | /// # use clap::{Command, Arg, ArgAction}; |
1082 | /// let cmd = Command::new("prog" ) |
1083 | /// .arg(Arg::new("file" ) |
1084 | /// .action(ArgAction::Set) |
1085 | /// .num_args(0..) |
1086 | /// .short('F' )) |
1087 | /// .arg(Arg::new("word" )); |
1088 | /// |
1089 | /// let m = cmd.clone().get_matches_from(vec![ |
1090 | /// "prog" , "-F" , "file1" , "file2" , "file3" , "word" |
1091 | /// ]); |
1092 | /// let files: Vec<_> = m.get_many::<String>("file" ).unwrap().collect(); |
1093 | /// assert_eq!(files, ["file1" , "file2" , "file3" , "word" ]); // wait...what?! |
1094 | /// assert!(!m.contains_id("word" )); // but we clearly used word! |
1095 | /// |
1096 | /// // but this works |
1097 | /// let m = cmd.clone().get_matches_from(vec![ |
1098 | /// "prog" , "word" , "-F" , "file1" , "file2" , "file3" , |
1099 | /// ]); |
1100 | /// let files: Vec<_> = m.get_many::<String>("file" ).unwrap().collect(); |
1101 | /// assert_eq!(files, ["file1" , "file2" , "file3" ]); |
1102 | /// assert_eq!(m.get_one::<String>("word" ).unwrap(), "word" ); |
1103 | /// ``` |
1104 | /// The problem is `clap` doesn't know when to stop parsing values for "file". |
1105 | /// |
1106 | /// A solution for the example above is to limit how many values with a maximum, or specific |
1107 | /// number, or to say [`ArgAction::Append`] is ok, but multiple values are not. |
1108 | /// ```rust |
1109 | /// # use clap_builder as clap; |
1110 | /// # use clap::{Command, Arg, ArgAction}; |
1111 | /// let m = Command::new("prog" ) |
1112 | /// .arg(Arg::new("file" ) |
1113 | /// .action(ArgAction::Append) |
1114 | /// .short('F' )) |
1115 | /// .arg(Arg::new("word" )) |
1116 | /// .get_matches_from(vec![ |
1117 | /// "prog" , "-F" , "file1" , "-F" , "file2" , "-F" , "file3" , "word" |
1118 | /// ]); |
1119 | /// |
1120 | /// let files: Vec<_> = m.get_many::<String>("file" ).unwrap().collect(); |
1121 | /// assert_eq!(files, ["file1" , "file2" , "file3" ]); |
1122 | /// assert_eq!(m.get_one::<String>("word" ).unwrap(), "word" ); |
1123 | /// ``` |
1124 | #[inline ] |
1125 | #[must_use ] |
1126 | pub fn num_args(mut self, qty: impl IntoResettable<ValueRange>) -> Self { |
1127 | self.num_vals = qty.into_resettable().into_option(); |
1128 | self |
1129 | } |
1130 | |
1131 | #[doc (hidden)] |
1132 | #[cfg_attr ( |
1133 | feature = "deprecated" , |
1134 | deprecated(since = "4.0.0" , note = "Replaced with `Arg::num_args`" ) |
1135 | )] |
1136 | pub fn number_of_values(self, qty: usize) -> Self { |
1137 | self.num_args(qty) |
1138 | } |
1139 | |
1140 | /// Placeholder for the argument's value in the help message / usage. |
1141 | /// |
1142 | /// This name is cosmetic only; the name is **not** used to access arguments. |
1143 | /// This setting can be very helpful when describing the type of input the user should be |
1144 | /// using, such as `FILE`, `INTERFACE`, etc. Although not required, it's somewhat convention to |
1145 | /// use all capital letters for the value name. |
1146 | /// |
1147 | /// **NOTE:** implicitly sets [`Arg::action(ArgAction::Set)`] |
1148 | /// |
1149 | /// # Examples |
1150 | /// |
1151 | /// ```rust |
1152 | /// # use clap_builder as clap; |
1153 | /// # use clap::{Command, Arg}; |
1154 | /// Arg::new("cfg" ) |
1155 | /// .long("config" ) |
1156 | /// .value_name("FILE" ) |
1157 | /// # ; |
1158 | /// ``` |
1159 | /// |
1160 | /// ```rust |
1161 | /// # use clap_builder as clap; |
1162 | /// # #[cfg (feature = "help" )] { |
1163 | /// # use clap::{Command, Arg}; |
1164 | /// let m = Command::new("prog" ) |
1165 | /// .arg(Arg::new("config" ) |
1166 | /// .long("config" ) |
1167 | /// .value_name("FILE" ) |
1168 | /// .help("Some help text" )) |
1169 | /// .get_matches_from(vec![ |
1170 | /// "prog" , "--help" |
1171 | /// ]); |
1172 | /// # } |
1173 | /// ``` |
1174 | /// Running the above program produces the following output |
1175 | /// |
1176 | /// ```text |
1177 | /// valnames |
1178 | /// |
1179 | /// Usage: valnames [OPTIONS] |
1180 | /// |
1181 | /// Options: |
1182 | /// --config <FILE> Some help text |
1183 | /// -h, --help Print help information |
1184 | /// -V, --version Print version information |
1185 | /// ``` |
1186 | /// [positional]: Arg::index() |
1187 | /// [`Arg::action(ArgAction::Set)`]: Arg::action() |
1188 | #[inline ] |
1189 | #[must_use ] |
1190 | pub fn value_name(mut self, name: impl IntoResettable<Str>) -> Self { |
1191 | if let Some(name) = name.into_resettable().into_option() { |
1192 | self.value_names([name]) |
1193 | } else { |
1194 | self.val_names.clear(); |
1195 | self |
1196 | } |
1197 | } |
1198 | |
1199 | /// Placeholders for the argument's values in the help message / usage. |
1200 | /// |
1201 | /// These names are cosmetic only, used for help and usage strings only. The names are **not** |
1202 | /// used to access arguments. The values of the arguments are accessed in numeric order (i.e. |
1203 | /// if you specify two names `one` and `two` `one` will be the first matched value, `two` will |
1204 | /// be the second). |
1205 | /// |
1206 | /// This setting can be very helpful when describing the type of input the user should be |
1207 | /// using, such as `FILE`, `INTERFACE`, etc. Although not required, it's somewhat convention to |
1208 | /// use all capital letters for the value name. |
1209 | /// |
1210 | /// **Pro Tip:** It may help to use [`Arg::next_line_help(true)`] if there are long, or |
1211 | /// multiple value names in order to not throw off the help text alignment of all options. |
1212 | /// |
1213 | /// **NOTE:** implicitly sets [`Arg::action(ArgAction::Set)`] and [`Arg::num_args(1..)`]. |
1214 | /// |
1215 | /// # Examples |
1216 | /// |
1217 | /// ```rust |
1218 | /// # use clap_builder as clap; |
1219 | /// # use clap::{Command, Arg}; |
1220 | /// Arg::new("speed" ) |
1221 | /// .short('s' ) |
1222 | /// .value_names(["fast" , "slow" ]); |
1223 | /// ``` |
1224 | /// |
1225 | /// ```rust |
1226 | /// # use clap_builder as clap; |
1227 | /// # #[cfg (feature = "help" )] { |
1228 | /// # use clap::{Command, Arg}; |
1229 | /// let m = Command::new("prog" ) |
1230 | /// .arg(Arg::new("io" ) |
1231 | /// .long("io-files" ) |
1232 | /// .value_names(["INFILE" , "OUTFILE" ])) |
1233 | /// .get_matches_from(vec![ |
1234 | /// "prog" , "--help" |
1235 | /// ]); |
1236 | /// # } |
1237 | /// ``` |
1238 | /// |
1239 | /// Running the above program produces the following output |
1240 | /// |
1241 | /// ```text |
1242 | /// valnames |
1243 | /// |
1244 | /// Usage: valnames [OPTIONS] |
1245 | /// |
1246 | /// Options: |
1247 | /// -h, --help Print help information |
1248 | /// --io-files <INFILE> <OUTFILE> Some help text |
1249 | /// -V, --version Print version information |
1250 | /// ``` |
1251 | /// [`Arg::next_line_help(true)`]: Arg::next_line_help() |
1252 | /// [`Arg::num_args`]: Arg::num_args() |
1253 | /// [`Arg::action(ArgAction::Set)`]: Arg::action() |
1254 | /// [`Arg::num_args(1..)`]: Arg::num_args() |
1255 | #[must_use ] |
1256 | pub fn value_names(mut self, names: impl IntoIterator<Item = impl Into<Str>>) -> Self { |
1257 | self.val_names = names.into_iter().map(|s| s.into()).collect(); |
1258 | self |
1259 | } |
1260 | |
1261 | /// Provide the shell a hint about how to complete this argument. |
1262 | /// |
1263 | /// See [`ValueHint`][crate::ValueHint] for more information. |
1264 | /// |
1265 | /// **NOTE:** implicitly sets [`Arg::action(ArgAction::Set)`]. |
1266 | /// |
1267 | /// For example, to take a username as argument: |
1268 | /// |
1269 | /// ```rust |
1270 | /// # use clap_builder as clap; |
1271 | /// # use clap::{Arg, ValueHint}; |
1272 | /// Arg::new("user" ) |
1273 | /// .short('u' ) |
1274 | /// .long("user" ) |
1275 | /// .value_hint(ValueHint::Username); |
1276 | /// ``` |
1277 | /// |
1278 | /// To take a full command line and its arguments (for example, when writing a command wrapper): |
1279 | /// |
1280 | /// ```rust |
1281 | /// # use clap_builder as clap; |
1282 | /// # use clap::{Command, Arg, ValueHint, ArgAction}; |
1283 | /// Command::new("prog" ) |
1284 | /// .trailing_var_arg(true) |
1285 | /// .arg( |
1286 | /// Arg::new("command" ) |
1287 | /// .action(ArgAction::Set) |
1288 | /// .num_args(1..) |
1289 | /// .value_hint(ValueHint::CommandWithArguments) |
1290 | /// ); |
1291 | /// ``` |
1292 | #[must_use ] |
1293 | pub fn value_hint(mut self, value_hint: impl IntoResettable<ValueHint>) -> Self { |
1294 | self.value_hint = value_hint.into_resettable().into_option(); |
1295 | self |
1296 | } |
1297 | |
1298 | /// Match values against [`PossibleValuesParser`][crate::builder::PossibleValuesParser] without matching case. |
1299 | /// |
1300 | /// When other arguments are conditionally required based on the |
1301 | /// value of a case-insensitive argument, the equality check done |
1302 | /// by [`Arg::required_if_eq`], [`Arg::required_if_eq_any`], or |
1303 | /// [`Arg::required_if_eq_all`] is case-insensitive. |
1304 | /// |
1305 | /// |
1306 | /// **NOTE:** Setting this requires [taking values][Arg::num_args] |
1307 | /// |
1308 | /// **NOTE:** To do unicode case folding, enable the `unicode` feature flag. |
1309 | /// |
1310 | /// # Examples |
1311 | /// |
1312 | /// ```rust |
1313 | /// # use clap_builder as clap; |
1314 | /// # use clap::{Command, Arg, ArgAction}; |
1315 | /// let m = Command::new("pv" ) |
1316 | /// .arg(Arg::new("option" ) |
1317 | /// .long("option" ) |
1318 | /// .action(ArgAction::Set) |
1319 | /// .ignore_case(true) |
1320 | /// .value_parser(["test123" ])) |
1321 | /// .get_matches_from(vec![ |
1322 | /// "pv" , "--option" , "TeSt123" , |
1323 | /// ]); |
1324 | /// |
1325 | /// assert!(m.get_one::<String>("option" ).unwrap().eq_ignore_ascii_case("test123" )); |
1326 | /// ``` |
1327 | /// |
1328 | /// This setting also works when multiple values can be defined: |
1329 | /// |
1330 | /// ```rust |
1331 | /// # use clap_builder as clap; |
1332 | /// # use clap::{Command, Arg, ArgAction}; |
1333 | /// let m = Command::new("pv" ) |
1334 | /// .arg(Arg::new("option" ) |
1335 | /// .short('o' ) |
1336 | /// .long("option" ) |
1337 | /// .action(ArgAction::Set) |
1338 | /// .ignore_case(true) |
1339 | /// .num_args(1..) |
1340 | /// .value_parser(["test123" , "test321" ])) |
1341 | /// .get_matches_from(vec![ |
1342 | /// "pv" , "--option" , "TeSt123" , "teST123" , "tESt321" |
1343 | /// ]); |
1344 | /// |
1345 | /// let matched_vals = m.get_many::<String>("option" ).unwrap().collect::<Vec<_>>(); |
1346 | /// assert_eq!(&*matched_vals, &["TeSt123" , "teST123" , "tESt321" ]); |
1347 | /// ``` |
1348 | #[inline ] |
1349 | #[must_use ] |
1350 | pub fn ignore_case(self, yes: bool) -> Self { |
1351 | if yes { |
1352 | self.setting(ArgSettings::IgnoreCase) |
1353 | } else { |
1354 | self.unset_setting(ArgSettings::IgnoreCase) |
1355 | } |
1356 | } |
1357 | |
1358 | /// Allows values which start with a leading hyphen (`-`) |
1359 | /// |
1360 | /// To limit values to just numbers, see |
1361 | /// [`allow_negative_numbers`][Arg::allow_negative_numbers]. |
1362 | /// |
1363 | /// See also [`trailing_var_arg`][Arg::trailing_var_arg]. |
1364 | /// |
1365 | /// **NOTE:** Setting this requires [taking values][Arg::num_args] |
1366 | /// |
1367 | /// **WARNING:** Prior arguments with `allow_hyphen_values(true)` get precedence over known |
1368 | /// flags but known flags get precedence over the next possible positional argument with |
1369 | /// `allow_hyphen_values(true)`. When combined with [`Arg::num_args(..)`], |
1370 | /// [`Arg::value_terminator`] is one way to ensure processing stops. |
1371 | /// |
1372 | /// **WARNING**: Take caution when using this setting combined with another argument using |
1373 | /// [`Arg::num_args`], as this becomes ambiguous `$ prog --arg -- -- val`. All |
1374 | /// three `--, --, val` will be values when the user may have thought the second `--` would |
1375 | /// constitute the normal, "Only positional args follow" idiom. |
1376 | /// |
1377 | /// # Examples |
1378 | /// |
1379 | /// ```rust |
1380 | /// # use clap_builder as clap; |
1381 | /// # use clap::{Command, Arg, ArgAction}; |
1382 | /// let m = Command::new("prog" ) |
1383 | /// .arg(Arg::new("pat" ) |
1384 | /// .action(ArgAction::Set) |
1385 | /// .allow_hyphen_values(true) |
1386 | /// .long("pattern" )) |
1387 | /// .get_matches_from(vec![ |
1388 | /// "prog" , "--pattern" , "-file" |
1389 | /// ]); |
1390 | /// |
1391 | /// assert_eq!(m.get_one::<String>("pat" ).unwrap(), "-file" ); |
1392 | /// ``` |
1393 | /// |
1394 | /// Not setting `Arg::allow_hyphen_values(true)` and supplying a value which starts with a |
1395 | /// hyphen is an error. |
1396 | /// |
1397 | /// ```rust |
1398 | /// # use clap_builder as clap; |
1399 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
1400 | /// let res = Command::new("prog" ) |
1401 | /// .arg(Arg::new("pat" ) |
1402 | /// .action(ArgAction::Set) |
1403 | /// .long("pattern" )) |
1404 | /// .try_get_matches_from(vec![ |
1405 | /// "prog" , "--pattern" , "-file" |
1406 | /// ]); |
1407 | /// |
1408 | /// assert!(res.is_err()); |
1409 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::UnknownArgument); |
1410 | /// ``` |
1411 | /// [`Arg::num_args(1)`]: Arg::num_args() |
1412 | #[inline ] |
1413 | #[must_use ] |
1414 | pub fn allow_hyphen_values(self, yes: bool) -> Self { |
1415 | if yes { |
1416 | self.setting(ArgSettings::AllowHyphenValues) |
1417 | } else { |
1418 | self.unset_setting(ArgSettings::AllowHyphenValues) |
1419 | } |
1420 | } |
1421 | |
1422 | /// Allows negative numbers to pass as values. |
1423 | /// |
1424 | /// This is similar to [`Arg::allow_hyphen_values`] except that it only allows numbers, |
1425 | /// all other undefined leading hyphens will fail to parse. |
1426 | /// |
1427 | /// **NOTE:** Setting this requires [taking values][Arg::num_args] |
1428 | /// |
1429 | /// # Examples |
1430 | /// |
1431 | /// ```rust |
1432 | /// # use clap_builder as clap; |
1433 | /// # use clap::{Command, Arg}; |
1434 | /// let res = Command::new("myprog" ) |
1435 | /// .arg(Arg::new("num" ).allow_negative_numbers(true)) |
1436 | /// .try_get_matches_from(vec![ |
1437 | /// "myprog" , "-20" |
1438 | /// ]); |
1439 | /// assert!(res.is_ok()); |
1440 | /// let m = res.unwrap(); |
1441 | /// assert_eq!(m.get_one::<String>("num" ).unwrap(), "-20" ); |
1442 | /// ``` |
1443 | #[inline ] |
1444 | pub fn allow_negative_numbers(self, yes: bool) -> Self { |
1445 | if yes { |
1446 | self.setting(ArgSettings::AllowNegativeNumbers) |
1447 | } else { |
1448 | self.unset_setting(ArgSettings::AllowNegativeNumbers) |
1449 | } |
1450 | } |
1451 | |
1452 | /// Requires that options use the `--option=val` syntax |
1453 | /// |
1454 | /// i.e. an equals between the option and associated value. |
1455 | /// |
1456 | /// **NOTE:** Setting this requires [taking values][Arg::num_args] |
1457 | /// |
1458 | /// # Examples |
1459 | /// |
1460 | /// Setting `require_equals` requires that the option have an equals sign between |
1461 | /// it and the associated value. |
1462 | /// |
1463 | /// ```rust |
1464 | /// # use clap_builder as clap; |
1465 | /// # use clap::{Command, Arg, ArgAction}; |
1466 | /// let res = Command::new("prog" ) |
1467 | /// .arg(Arg::new("cfg" ) |
1468 | /// .action(ArgAction::Set) |
1469 | /// .require_equals(true) |
1470 | /// .long("config" )) |
1471 | /// .try_get_matches_from(vec![ |
1472 | /// "prog" , "--config=file.conf" |
1473 | /// ]); |
1474 | /// |
1475 | /// assert!(res.is_ok()); |
1476 | /// ``` |
1477 | /// |
1478 | /// Setting `require_equals` and *not* supplying the equals will cause an |
1479 | /// error. |
1480 | /// |
1481 | /// ```rust |
1482 | /// # use clap_builder as clap; |
1483 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
1484 | /// let res = Command::new("prog" ) |
1485 | /// .arg(Arg::new("cfg" ) |
1486 | /// .action(ArgAction::Set) |
1487 | /// .require_equals(true) |
1488 | /// .long("config" )) |
1489 | /// .try_get_matches_from(vec![ |
1490 | /// "prog" , "--config" , "file.conf" |
1491 | /// ]); |
1492 | /// |
1493 | /// assert!(res.is_err()); |
1494 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::NoEquals); |
1495 | /// ``` |
1496 | #[inline ] |
1497 | #[must_use ] |
1498 | pub fn require_equals(self, yes: bool) -> Self { |
1499 | if yes { |
1500 | self.setting(ArgSettings::RequireEquals) |
1501 | } else { |
1502 | self.unset_setting(ArgSettings::RequireEquals) |
1503 | } |
1504 | } |
1505 | |
1506 | #[doc (hidden)] |
1507 | #[cfg_attr ( |
1508 | feature = "deprecated" , |
1509 | deprecated(since = "4.0.0" , note = "Replaced with `Arg::value_delimiter`" ) |
1510 | )] |
1511 | pub fn use_value_delimiter(mut self, yes: bool) -> Self { |
1512 | if yes { |
1513 | self.val_delim.get_or_insert(',' ); |
1514 | } else { |
1515 | self.val_delim = None; |
1516 | } |
1517 | self |
1518 | } |
1519 | |
1520 | /// Allow grouping of multiple values via a delimiter. |
1521 | /// |
1522 | /// i.e. should `--option=val1,val2,val3` be parsed as three values (`val1`, `val2`, |
1523 | /// and `val3`) or as a single value (`val1,val2,val3`). Defaults to using `,` (comma) as the |
1524 | /// value delimiter for all arguments that accept values (options and positional arguments) |
1525 | /// |
1526 | /// **NOTE:** implicitly sets [`Arg::action(ArgAction::Set)`] |
1527 | /// |
1528 | /// # Examples |
1529 | /// |
1530 | /// ```rust |
1531 | /// # use clap_builder as clap; |
1532 | /// # use clap::{Command, Arg}; |
1533 | /// let m = Command::new("prog" ) |
1534 | /// .arg(Arg::new("config" ) |
1535 | /// .short('c' ) |
1536 | /// .long("config" ) |
1537 | /// .value_delimiter(',' )) |
1538 | /// .get_matches_from(vec![ |
1539 | /// "prog" , "--config=val1,val2,val3" |
1540 | /// ]); |
1541 | /// |
1542 | /// assert_eq!(m.get_many::<String>("config" ).unwrap().collect::<Vec<_>>(), ["val1" , "val2" , "val3" ]) |
1543 | /// ``` |
1544 | /// [`Arg::value_delimiter(',')`]: Arg::value_delimiter() |
1545 | /// [`Arg::action(ArgAction::Set)`]: Arg::action() |
1546 | #[inline ] |
1547 | #[must_use ] |
1548 | pub fn value_delimiter(mut self, d: impl IntoResettable<char>) -> Self { |
1549 | self.val_delim = d.into_resettable().into_option(); |
1550 | self |
1551 | } |
1552 | |
1553 | /// Sentinel to **stop** parsing multiple values of a given argument. |
1554 | /// |
1555 | /// By default when |
1556 | /// one sets [`num_args(1..)`] on an argument, clap will continue parsing values for that |
1557 | /// argument until it reaches another valid argument, or one of the other more specific settings |
1558 | /// for multiple values is used (such as [`num_args`]). |
1559 | /// |
1560 | /// **NOTE:** This setting only applies to [options] and [positional arguments] |
1561 | /// |
1562 | /// **NOTE:** When the terminator is passed in on the command line, it is **not** stored as one |
1563 | /// of the values |
1564 | /// |
1565 | /// # Examples |
1566 | /// |
1567 | /// ```rust |
1568 | /// # use clap_builder as clap; |
1569 | /// # use clap::{Command, Arg, ArgAction}; |
1570 | /// Arg::new("vals" ) |
1571 | /// .action(ArgAction::Set) |
1572 | /// .num_args(1..) |
1573 | /// .value_terminator(";" ) |
1574 | /// # ; |
1575 | /// ``` |
1576 | /// |
1577 | /// The following example uses two arguments, a sequence of commands, and the location in which |
1578 | /// to perform them |
1579 | /// |
1580 | /// ```rust |
1581 | /// # use clap_builder as clap; |
1582 | /// # use clap::{Command, Arg, ArgAction}; |
1583 | /// let m = Command::new("prog" ) |
1584 | /// .arg(Arg::new("cmds" ) |
1585 | /// .action(ArgAction::Set) |
1586 | /// .num_args(1..) |
1587 | /// .allow_hyphen_values(true) |
1588 | /// .value_terminator(";" )) |
1589 | /// .arg(Arg::new("location" )) |
1590 | /// .get_matches_from(vec![ |
1591 | /// "prog" , "find" , "-type" , "f" , "-name" , "special" , ";" , "/home/clap" |
1592 | /// ]); |
1593 | /// let cmds: Vec<_> = m.get_many::<String>("cmds" ).unwrap().collect(); |
1594 | /// assert_eq!(&cmds, &["find" , "-type" , "f" , "-name" , "special" ]); |
1595 | /// assert_eq!(m.get_one::<String>("location" ).unwrap(), "/home/clap" ); |
1596 | /// ``` |
1597 | /// [options]: Arg::action |
1598 | /// [positional arguments]: Arg::index() |
1599 | /// [`num_args(1..)`]: Arg::num_args() |
1600 | /// [`num_args`]: Arg::num_args() |
1601 | #[inline ] |
1602 | #[must_use ] |
1603 | pub fn value_terminator(mut self, term: impl IntoResettable<Str>) -> Self { |
1604 | self.terminator = term.into_resettable().into_option(); |
1605 | self |
1606 | } |
1607 | |
1608 | /// Consume all following arguments. |
1609 | /// |
1610 | /// Do not be parse them individually, but rather pass them in entirety. |
1611 | /// |
1612 | /// It is worth noting that setting this requires all values to come after a `--` to indicate |
1613 | /// they should all be captured. For example: |
1614 | /// |
1615 | /// ```text |
1616 | /// --foo something -- -v -v -v -b -b -b --baz -q -u -x |
1617 | /// ``` |
1618 | /// |
1619 | /// Will result in everything after `--` to be considered one raw argument. This behavior |
1620 | /// may not be exactly what you are expecting and using [`crate::Command::trailing_var_arg`] |
1621 | /// may be more appropriate. |
1622 | /// |
1623 | /// **NOTE:** Implicitly sets [`Arg::action(ArgAction::Set)`] [`Arg::num_args(1..)`], |
1624 | /// [`Arg::allow_hyphen_values(true)`], and [`Arg::last(true)`] when set to `true`. |
1625 | /// |
1626 | /// [`Arg::action(ArgAction::Set)`]: Arg::action() |
1627 | /// [`Arg::num_args(1..)`]: Arg::num_args() |
1628 | /// [`Arg::allow_hyphen_values(true)`]: Arg::allow_hyphen_values() |
1629 | /// [`Arg::last(true)`]: Arg::last() |
1630 | #[inline ] |
1631 | #[must_use ] |
1632 | pub fn raw(mut self, yes: bool) -> Self { |
1633 | if yes { |
1634 | self.num_vals.get_or_insert_with(|| (1..).into()); |
1635 | } |
1636 | self.allow_hyphen_values(yes).last(yes) |
1637 | } |
1638 | |
1639 | /// Value for the argument when not present. |
1640 | /// |
1641 | /// **NOTE:** If the user *does not* use this argument at runtime [`ArgMatches::contains_id`] will |
1642 | /// still return `true`. If you wish to determine whether the argument was used at runtime or |
1643 | /// not, consider [`ArgMatches::value_source`][crate::ArgMatches::value_source]. |
1644 | /// |
1645 | /// **NOTE:** This setting is perfectly compatible with [`Arg::default_value_if`] but slightly |
1646 | /// different. `Arg::default_value` *only* takes effect when the user has not provided this arg |
1647 | /// at runtime. `Arg::default_value_if` however only takes effect when the user has not provided |
1648 | /// a value at runtime **and** these other conditions are met as well. If you have set |
1649 | /// `Arg::default_value` and `Arg::default_value_if`, and the user **did not** provide this arg |
1650 | /// at runtime, nor were the conditions met for `Arg::default_value_if`, the `Arg::default_value` |
1651 | /// will be applied. |
1652 | /// |
1653 | /// Like with command-line values, this will be split by [`Arg::value_delimiter`]. |
1654 | /// |
1655 | /// # Examples |
1656 | /// |
1657 | /// First we use the default value without providing any value at runtime. |
1658 | /// |
1659 | /// ```rust |
1660 | /// # use clap_builder as clap; |
1661 | /// # use clap::{Command, Arg, parser::ValueSource}; |
1662 | /// let m = Command::new("prog" ) |
1663 | /// .arg(Arg::new("opt" ) |
1664 | /// .long("myopt" ) |
1665 | /// .default_value("myval" )) |
1666 | /// .get_matches_from(vec![ |
1667 | /// "prog" |
1668 | /// ]); |
1669 | /// |
1670 | /// assert_eq!(m.get_one::<String>("opt" ).unwrap(), "myval" ); |
1671 | /// assert!(m.contains_id("opt" )); |
1672 | /// assert_eq!(m.value_source("opt" ), Some(ValueSource::DefaultValue)); |
1673 | /// ``` |
1674 | /// |
1675 | /// Next we provide a value at runtime to override the default. |
1676 | /// |
1677 | /// ```rust |
1678 | /// # use clap_builder as clap; |
1679 | /// # use clap::{Command, Arg, parser::ValueSource}; |
1680 | /// let m = Command::new("prog" ) |
1681 | /// .arg(Arg::new("opt" ) |
1682 | /// .long("myopt" ) |
1683 | /// .default_value("myval" )) |
1684 | /// .get_matches_from(vec![ |
1685 | /// "prog" , "--myopt=non_default" |
1686 | /// ]); |
1687 | /// |
1688 | /// assert_eq!(m.get_one::<String>("opt" ).unwrap(), "non_default" ); |
1689 | /// assert!(m.contains_id("opt" )); |
1690 | /// assert_eq!(m.value_source("opt" ), Some(ValueSource::CommandLine)); |
1691 | /// ``` |
1692 | /// [`Arg::action(ArgAction::Set)`]: Arg::action() |
1693 | /// [`ArgMatches::contains_id`]: crate::ArgMatches::contains_id() |
1694 | /// [`Arg::default_value_if`]: Arg::default_value_if() |
1695 | #[inline ] |
1696 | #[must_use ] |
1697 | pub fn default_value(mut self, val: impl IntoResettable<OsStr>) -> Self { |
1698 | if let Some(val) = val.into_resettable().into_option() { |
1699 | self.default_values([val]) |
1700 | } else { |
1701 | self.default_vals.clear(); |
1702 | self |
1703 | } |
1704 | } |
1705 | |
1706 | #[inline ] |
1707 | #[must_use ] |
1708 | #[doc (hidden)] |
1709 | #[cfg_attr ( |
1710 | feature = "deprecated" , |
1711 | deprecated(since = "4.0.0" , note = "Replaced with `Arg::default_value`" ) |
1712 | )] |
1713 | pub fn default_value_os(self, val: impl Into<OsStr>) -> Self { |
1714 | self.default_values([val]) |
1715 | } |
1716 | |
1717 | /// Value for the argument when not present. |
1718 | /// |
1719 | /// See [`Arg::default_value`]. |
1720 | /// |
1721 | /// [`Arg::default_value`]: Arg::default_value() |
1722 | #[inline ] |
1723 | #[must_use ] |
1724 | pub fn default_values(mut self, vals: impl IntoIterator<Item = impl Into<OsStr>>) -> Self { |
1725 | self.default_vals = vals.into_iter().map(|s| s.into()).collect(); |
1726 | self |
1727 | } |
1728 | |
1729 | #[inline ] |
1730 | #[must_use ] |
1731 | #[doc (hidden)] |
1732 | #[cfg_attr ( |
1733 | feature = "deprecated" , |
1734 | deprecated(since = "4.0.0" , note = "Replaced with `Arg::default_values`" ) |
1735 | )] |
1736 | pub fn default_values_os(self, vals: impl IntoIterator<Item = impl Into<OsStr>>) -> Self { |
1737 | self.default_values(vals) |
1738 | } |
1739 | |
1740 | /// Value for the argument when the flag is present but no value is specified. |
1741 | /// |
1742 | /// This configuration option is often used to give the user a shortcut and allow them to |
1743 | /// efficiently specify an option argument without requiring an explicitly value. The `--color` |
1744 | /// argument is a common example. By, supplying an default, such as `default_missing_value("always")`, |
1745 | /// the user can quickly just add `--color` to the command line to produce the desired color output. |
1746 | /// |
1747 | /// **NOTE:** using this configuration option requires the use of the |
1748 | /// [`.num_args(0..N)`][Arg::num_args] and the |
1749 | /// [`.require_equals(true)`][Arg::require_equals] configuration option. These are required in |
1750 | /// order to unambiguously determine what, if any, value was supplied for the argument. |
1751 | /// |
1752 | /// Like with command-line values, this will be split by [`Arg::value_delimiter`]. |
1753 | /// |
1754 | /// # Examples |
1755 | /// |
1756 | /// For POSIX style `--color`: |
1757 | /// ```rust |
1758 | /// # use clap_builder as clap; |
1759 | /// # use clap::{Command, Arg, parser::ValueSource}; |
1760 | /// fn cli() -> Command { |
1761 | /// Command::new("prog" ) |
1762 | /// .arg(Arg::new("color" ).long("color" ) |
1763 | /// .value_name("WHEN" ) |
1764 | /// .value_parser(["always" , "auto" , "never" ]) |
1765 | /// .default_value("auto" ) |
1766 | /// .num_args(0..=1) |
1767 | /// .require_equals(true) |
1768 | /// .default_missing_value("always" ) |
1769 | /// .help("Specify WHEN to colorize output." ) |
1770 | /// ) |
1771 | /// } |
1772 | /// |
1773 | /// // first, we'll provide no arguments |
1774 | /// let m = cli().get_matches_from(vec![ |
1775 | /// "prog" |
1776 | /// ]); |
1777 | /// assert_eq!(m.get_one::<String>("color" ).unwrap(), "auto" ); |
1778 | /// assert_eq!(m.value_source("color" ), Some(ValueSource::DefaultValue)); |
1779 | /// |
1780 | /// // next, we'll provide a runtime value to override the default (as usually done). |
1781 | /// let m = cli().get_matches_from(vec![ |
1782 | /// "prog" , "--color=never" |
1783 | /// ]); |
1784 | /// assert_eq!(m.get_one::<String>("color" ).unwrap(), "never" ); |
1785 | /// assert_eq!(m.value_source("color" ), Some(ValueSource::CommandLine)); |
1786 | /// |
1787 | /// // finally, we will use the shortcut and only provide the argument without a value. |
1788 | /// let m = cli().get_matches_from(vec![ |
1789 | /// "prog" , "--color" |
1790 | /// ]); |
1791 | /// assert_eq!(m.get_one::<String>("color" ).unwrap(), "always" ); |
1792 | /// assert_eq!(m.value_source("color" ), Some(ValueSource::CommandLine)); |
1793 | /// ``` |
1794 | /// |
1795 | /// For bool literals: |
1796 | /// ```rust |
1797 | /// # use clap_builder as clap; |
1798 | /// # use clap::{Command, Arg, parser::ValueSource, value_parser}; |
1799 | /// fn cli() -> Command { |
1800 | /// Command::new("prog" ) |
1801 | /// .arg(Arg::new("create" ).long("create" ) |
1802 | /// .value_name("BOOL" ) |
1803 | /// .value_parser(value_parser!(bool)) |
1804 | /// .num_args(0..=1) |
1805 | /// .require_equals(true) |
1806 | /// .default_missing_value("true" ) |
1807 | /// ) |
1808 | /// } |
1809 | /// |
1810 | /// // first, we'll provide no arguments |
1811 | /// let m = cli().get_matches_from(vec![ |
1812 | /// "prog" |
1813 | /// ]); |
1814 | /// assert_eq!(m.get_one::<bool>("create" ).copied(), None); |
1815 | /// |
1816 | /// // next, we'll provide a runtime value to override the default (as usually done). |
1817 | /// let m = cli().get_matches_from(vec![ |
1818 | /// "prog" , "--create=false" |
1819 | /// ]); |
1820 | /// assert_eq!(m.get_one::<bool>("create" ).copied(), Some(false)); |
1821 | /// assert_eq!(m.value_source("create" ), Some(ValueSource::CommandLine)); |
1822 | /// |
1823 | /// // finally, we will use the shortcut and only provide the argument without a value. |
1824 | /// let m = cli().get_matches_from(vec![ |
1825 | /// "prog" , "--create" |
1826 | /// ]); |
1827 | /// assert_eq!(m.get_one::<bool>("create" ).copied(), Some(true)); |
1828 | /// assert_eq!(m.value_source("create" ), Some(ValueSource::CommandLine)); |
1829 | /// ``` |
1830 | /// |
1831 | /// [`Arg::action(ArgAction::Set)`]: Arg::action() |
1832 | /// [`Arg::default_value`]: Arg::default_value() |
1833 | #[inline ] |
1834 | #[must_use ] |
1835 | pub fn default_missing_value(mut self, val: impl IntoResettable<OsStr>) -> Self { |
1836 | if let Some(val) = val.into_resettable().into_option() { |
1837 | self.default_missing_values_os([val]) |
1838 | } else { |
1839 | self.default_missing_vals.clear(); |
1840 | self |
1841 | } |
1842 | } |
1843 | |
1844 | /// Value for the argument when the flag is present but no value is specified. |
1845 | /// |
1846 | /// See [`Arg::default_missing_value`]. |
1847 | /// |
1848 | /// [`Arg::default_missing_value`]: Arg::default_missing_value() |
1849 | /// [`OsStr`]: std::ffi::OsStr |
1850 | #[inline ] |
1851 | #[must_use ] |
1852 | pub fn default_missing_value_os(self, val: impl Into<OsStr>) -> Self { |
1853 | self.default_missing_values_os([val]) |
1854 | } |
1855 | |
1856 | /// Value for the argument when the flag is present but no value is specified. |
1857 | /// |
1858 | /// See [`Arg::default_missing_value`]. |
1859 | /// |
1860 | /// [`Arg::default_missing_value`]: Arg::default_missing_value() |
1861 | #[inline ] |
1862 | #[must_use ] |
1863 | pub fn default_missing_values(self, vals: impl IntoIterator<Item = impl Into<OsStr>>) -> Self { |
1864 | self.default_missing_values_os(vals) |
1865 | } |
1866 | |
1867 | /// Value for the argument when the flag is present but no value is specified. |
1868 | /// |
1869 | /// See [`Arg::default_missing_values`]. |
1870 | /// |
1871 | /// [`Arg::default_missing_values`]: Arg::default_missing_values() |
1872 | /// [`OsStr`]: std::ffi::OsStr |
1873 | #[inline ] |
1874 | #[must_use ] |
1875 | pub fn default_missing_values_os( |
1876 | mut self, |
1877 | vals: impl IntoIterator<Item = impl Into<OsStr>>, |
1878 | ) -> Self { |
1879 | self.default_missing_vals = vals.into_iter().map(|s| s.into()).collect(); |
1880 | self |
1881 | } |
1882 | |
1883 | /// Read from `name` environment variable when argument is not present. |
1884 | /// |
1885 | /// If it is not present in the environment, then default |
1886 | /// rules will apply. |
1887 | /// |
1888 | /// If user sets the argument in the environment: |
1889 | /// - When [`Arg::action(ArgAction::Set)`] is not set, the flag is considered raised. |
1890 | /// - When [`Arg::action(ArgAction::Set)`] is set, |
1891 | /// [`ArgMatches::get_one`][crate::ArgMatches::get_one] will |
1892 | /// return value of the environment variable. |
1893 | /// |
1894 | /// If user doesn't set the argument in the environment: |
1895 | /// - When [`Arg::action(ArgAction::Set)`] is not set, the flag is considered off. |
1896 | /// - When [`Arg::action(ArgAction::Set)`] is set, |
1897 | /// [`ArgMatches::get_one`][crate::ArgMatches::get_one] will |
1898 | /// return the default specified. |
1899 | /// |
1900 | /// Like with command-line values, this will be split by [`Arg::value_delimiter`]. |
1901 | /// |
1902 | /// # Examples |
1903 | /// |
1904 | /// In this example, we show the variable coming from the environment: |
1905 | /// |
1906 | /// ```rust |
1907 | /// # use clap_builder as clap; |
1908 | /// # use std::env; |
1909 | /// # use clap::{Command, Arg, ArgAction}; |
1910 | /// |
1911 | /// env::set_var("MY_FLAG", "env"); |
1912 | /// |
1913 | /// let m = Command::new("prog") |
1914 | /// .arg(Arg::new("flag") |
1915 | /// .long("flag") |
1916 | /// .env("MY_FLAG") |
1917 | /// .action(ArgAction::Set)) |
1918 | /// .get_matches_from(vec![ |
1919 | /// "prog" |
1920 | /// ]); |
1921 | /// |
1922 | /// assert_eq!(m.get_one::<String>("flag").unwrap(), "env"); |
1923 | /// ``` |
1924 | /// |
1925 | /// In this example, because `prog` is a flag that accepts an optional, case-insensitive |
1926 | /// boolean literal. |
1927 | /// |
1928 | /// Note that the value parser controls how flags are parsed. In this case we've selected |
1929 | /// [`FalseyValueParser`][crate::builder::FalseyValueParser]. A `false` literal is `n`, `no`, |
1930 | /// `f`, `false`, `off` or `0`. An absent environment variable will also be considered as |
1931 | /// `false`. Anything else will considered as `true`. |
1932 | /// |
1933 | /// ```rust |
1934 | /// # use clap_builder as clap; |
1935 | /// # use std::env; |
1936 | /// # use clap::{Command, Arg, ArgAction}; |
1937 | /// # use clap::builder::FalseyValueParser; |
1938 | /// |
1939 | /// env::set_var("TRUE_FLAG", "true"); |
1940 | /// env::set_var("FALSE_FLAG", "0"); |
1941 | /// |
1942 | /// let m = Command::new("prog") |
1943 | /// .arg(Arg::new("true_flag") |
1944 | /// .long("true_flag") |
1945 | /// .action(ArgAction::SetTrue) |
1946 | /// .value_parser(FalseyValueParser::new()) |
1947 | /// .env("TRUE_FLAG")) |
1948 | /// .arg(Arg::new("false_flag") |
1949 | /// .long("false_flag") |
1950 | /// .action(ArgAction::SetTrue) |
1951 | /// .value_parser(FalseyValueParser::new()) |
1952 | /// .env("FALSE_FLAG")) |
1953 | /// .arg(Arg::new("absent_flag") |
1954 | /// .long("absent_flag") |
1955 | /// .action(ArgAction::SetTrue) |
1956 | /// .value_parser(FalseyValueParser::new()) |
1957 | /// .env("ABSENT_FLAG")) |
1958 | /// .get_matches_from(vec![ |
1959 | /// "prog" |
1960 | /// ]); |
1961 | /// |
1962 | /// assert!(m.get_flag("true_flag")); |
1963 | /// assert!(!m.get_flag("false_flag")); |
1964 | /// assert!(!m.get_flag("absent_flag")); |
1965 | /// ``` |
1966 | /// |
1967 | /// In this example, we show the variable coming from an option on the CLI: |
1968 | /// |
1969 | /// ```rust |
1970 | /// # use clap_builder as clap; |
1971 | /// # use std::env; |
1972 | /// # use clap::{Command, Arg, ArgAction}; |
1973 | /// |
1974 | /// env::set_var("MY_FLAG", "env"); |
1975 | /// |
1976 | /// let m = Command::new("prog") |
1977 | /// .arg(Arg::new("flag") |
1978 | /// .long("flag") |
1979 | /// .env("MY_FLAG") |
1980 | /// .action(ArgAction::Set)) |
1981 | /// .get_matches_from(vec![ |
1982 | /// "prog", "--flag", "opt" |
1983 | /// ]); |
1984 | /// |
1985 | /// assert_eq!(m.get_one::<String>("flag").unwrap(), "opt"); |
1986 | /// ``` |
1987 | /// |
1988 | /// In this example, we show the variable coming from the environment even with the |
1989 | /// presence of a default: |
1990 | /// |
1991 | /// ```rust |
1992 | /// # use clap_builder as clap; |
1993 | /// # use std::env; |
1994 | /// # use clap::{Command, Arg, ArgAction}; |
1995 | /// |
1996 | /// env::set_var("MY_FLAG", "env"); |
1997 | /// |
1998 | /// let m = Command::new("prog") |
1999 | /// .arg(Arg::new("flag") |
2000 | /// .long("flag") |
2001 | /// .env("MY_FLAG") |
2002 | /// .action(ArgAction::Set) |
2003 | /// .default_value("default")) |
2004 | /// .get_matches_from(vec![ |
2005 | /// "prog" |
2006 | /// ]); |
2007 | /// |
2008 | /// assert_eq!(m.get_one::<String>("flag").unwrap(), "env"); |
2009 | /// ``` |
2010 | /// |
2011 | /// In this example, we show the use of multiple values in a single environment variable: |
2012 | /// |
2013 | /// ```rust |
2014 | /// # use clap_builder as clap; |
2015 | /// # use std::env; |
2016 | /// # use clap::{Command, Arg, ArgAction}; |
2017 | /// |
2018 | /// env::set_var("MY_FLAG_MULTI", "env1,env2"); |
2019 | /// |
2020 | /// let m = Command::new("prog") |
2021 | /// .arg(Arg::new("flag") |
2022 | /// .long("flag") |
2023 | /// .env("MY_FLAG_MULTI") |
2024 | /// .action(ArgAction::Set) |
2025 | /// .num_args(1..) |
2026 | /// .value_delimiter(',')) |
2027 | /// .get_matches_from(vec![ |
2028 | /// "prog" |
2029 | /// ]); |
2030 | /// |
2031 | /// assert_eq!(m.get_many::<String>("flag").unwrap().collect::<Vec<_>>(), vec!["env1", "env2"]); |
2032 | /// ``` |
2033 | /// [`Arg::action(ArgAction::Set)`]: Arg::action() |
2034 | /// [`Arg::value_delimiter(',')`]: Arg::value_delimiter() |
2035 | #[cfg (feature = "env" )] |
2036 | #[inline ] |
2037 | #[must_use ] |
2038 | pub fn env(mut self, name: impl IntoResettable<OsStr>) -> Self { |
2039 | if let Some(name) = name.into_resettable().into_option() { |
2040 | let value = env::var_os(&name); |
2041 | self.env = Some((name, value)); |
2042 | } else { |
2043 | self.env = None; |
2044 | } |
2045 | self |
2046 | } |
2047 | |
2048 | #[cfg (feature = "env" )] |
2049 | #[doc (hidden)] |
2050 | #[cfg_attr ( |
2051 | feature = "deprecated" , |
2052 | deprecated(since = "4.0.0" , note = "Replaced with `Arg::env`" ) |
2053 | )] |
2054 | pub fn env_os(self, name: impl Into<OsStr>) -> Self { |
2055 | self.env(name) |
2056 | } |
2057 | } |
2058 | |
2059 | /// # Help |
2060 | impl Arg { |
2061 | /// Sets the description of the argument for short help (`-h`). |
2062 | /// |
2063 | /// Typically, this is a short (one line) description of the arg. |
2064 | /// |
2065 | /// If [`Arg::long_help`] is not specified, this message will be displayed for `--help`. |
2066 | /// |
2067 | /// **NOTE:** Only `Arg::help` is used in completion script generation in order to be concise |
2068 | /// |
2069 | /// # Examples |
2070 | /// |
2071 | /// Any valid UTF-8 is allowed in the help text. The one exception is when one wishes to |
2072 | /// include a newline in the help text and have the following text be properly aligned with all |
2073 | /// the other help text. |
2074 | /// |
2075 | /// Setting `help` displays a short message to the side of the argument when the user passes |
2076 | /// `-h` or `--help` (by default). |
2077 | /// |
2078 | /// ```rust |
2079 | /// # #[cfg (feature = "help" )] { |
2080 | /// # use clap_builder as clap; |
2081 | /// # use clap::{Command, Arg}; |
2082 | /// let m = Command::new("prog" ) |
2083 | /// .arg(Arg::new("cfg" ) |
2084 | /// .long("config" ) |
2085 | /// .help("Some help text describing the --config arg" )) |
2086 | /// .get_matches_from(vec![ |
2087 | /// "prog" , "--help" |
2088 | /// ]); |
2089 | /// # } |
2090 | /// ``` |
2091 | /// |
2092 | /// The above example displays |
2093 | /// |
2094 | /// ```notrust |
2095 | /// helptest |
2096 | /// |
2097 | /// Usage: helptest [OPTIONS] |
2098 | /// |
2099 | /// Options: |
2100 | /// --config Some help text describing the --config arg |
2101 | /// -h, --help Print help information |
2102 | /// -V, --version Print version information |
2103 | /// ``` |
2104 | /// [`Arg::long_help`]: Arg::long_help() |
2105 | #[inline ] |
2106 | #[must_use ] |
2107 | pub fn help(mut self, h: impl IntoResettable<StyledStr>) -> Self { |
2108 | self.help = h.into_resettable().into_option(); |
2109 | self |
2110 | } |
2111 | |
2112 | /// Sets the description of the argument for long help (`--help`). |
2113 | /// |
2114 | /// Typically this a more detailed (multi-line) message |
2115 | /// that describes the arg. |
2116 | /// |
2117 | /// If [`Arg::help`] is not specified, this message will be displayed for `-h`. |
2118 | /// |
2119 | /// **NOTE:** Only [`Arg::help`] is used in completion script generation in order to be concise |
2120 | /// |
2121 | /// # Examples |
2122 | /// |
2123 | /// Any valid UTF-8 is allowed in the help text. The one exception is when one wishes to |
2124 | /// include a newline in the help text and have the following text be properly aligned with all |
2125 | /// the other help text. |
2126 | /// |
2127 | /// Setting `help` displays a short message to the side of the argument when the user passes |
2128 | /// `-h` or `--help` (by default). |
2129 | /// |
2130 | /// ```rust |
2131 | /// # #[cfg (feature = "help" )] { |
2132 | /// # use clap_builder as clap; |
2133 | /// # use clap::{Command, Arg}; |
2134 | /// let m = Command::new("prog" ) |
2135 | /// .arg(Arg::new("cfg" ) |
2136 | /// .long("config" ) |
2137 | /// .long_help( |
2138 | /// "The config file used by the myprog must be in JSON format |
2139 | /// with only valid keys and may not contain other nonsense |
2140 | /// that cannot be read by this program. Obviously I'm going on |
2141 | /// and on, so I'll stop now." )) |
2142 | /// .get_matches_from(vec![ |
2143 | /// "prog" , "--help" |
2144 | /// ]); |
2145 | /// # } |
2146 | /// ``` |
2147 | /// |
2148 | /// The above example displays |
2149 | /// |
2150 | /// ```text |
2151 | /// prog |
2152 | /// |
2153 | /// Usage: prog [OPTIONS] |
2154 | /// |
2155 | /// Options: |
2156 | /// --config |
2157 | /// The config file used by the myprog must be in JSON format |
2158 | /// with only valid keys and may not contain other nonsense |
2159 | /// that cannot be read by this program. Obviously I'm going on |
2160 | /// and on, so I'll stop now. |
2161 | /// |
2162 | /// -h, --help |
2163 | /// Print help information |
2164 | /// |
2165 | /// -V, --version |
2166 | /// Print version information |
2167 | /// ``` |
2168 | /// [`Arg::help`]: Arg::help() |
2169 | #[inline ] |
2170 | #[must_use ] |
2171 | pub fn long_help(mut self, h: impl IntoResettable<StyledStr>) -> Self { |
2172 | self.long_help = h.into_resettable().into_option(); |
2173 | self |
2174 | } |
2175 | |
2176 | /// Allows custom ordering of args within the help message. |
2177 | /// |
2178 | /// `Arg`s with a lower value will be displayed first in the help message. |
2179 | /// Those with the same display order will be sorted. |
2180 | /// |
2181 | /// `Arg`s are automatically assigned a display order based on the order they are added to the |
2182 | /// [`Command`][crate::Command]. |
2183 | /// Overriding this is helpful when the order arguments are added in isn't the same as the |
2184 | /// display order, whether in one-off cases or to automatically sort arguments. |
2185 | /// |
2186 | /// To change, see [`Command::next_display_order`][crate::Command::next_display_order]. |
2187 | /// |
2188 | /// **NOTE:** This setting is ignored for [positional arguments] which are always displayed in |
2189 | /// [index] order. |
2190 | /// |
2191 | /// # Examples |
2192 | /// |
2193 | /// ```rust |
2194 | /// # #[cfg (feature = "help" )] { |
2195 | /// # use clap_builder as clap; |
2196 | /// # use clap::{Command, Arg, ArgAction}; |
2197 | /// let m = Command::new("prog" ) |
2198 | /// .arg(Arg::new("boat" ) |
2199 | /// .short('b' ) |
2200 | /// .long("boat" ) |
2201 | /// .action(ArgAction::Set) |
2202 | /// .display_order(0) // Sort |
2203 | /// .help("Some help and text" )) |
2204 | /// .arg(Arg::new("airplane" ) |
2205 | /// .short('a' ) |
2206 | /// .long("airplane" ) |
2207 | /// .action(ArgAction::Set) |
2208 | /// .display_order(0) // Sort |
2209 | /// .help("I should be first!" )) |
2210 | /// .arg(Arg::new("custom-help" ) |
2211 | /// .short('?' ) |
2212 | /// .action(ArgAction::Help) |
2213 | /// .display_order(100) // Don't sort |
2214 | /// .help("Alt help" )) |
2215 | /// .get_matches_from(vec![ |
2216 | /// "prog" , "--help" |
2217 | /// ]); |
2218 | /// # } |
2219 | /// ``` |
2220 | /// |
2221 | /// The above example displays the following help message |
2222 | /// |
2223 | /// ```text |
2224 | /// cust-ord |
2225 | /// |
2226 | /// Usage: cust-ord [OPTIONS] |
2227 | /// |
2228 | /// Options: |
2229 | /// -a, --airplane <airplane> I should be first! |
2230 | /// -b, --boat <boar> Some help and text |
2231 | /// -h, --help Print help information |
2232 | /// -? Alt help |
2233 | /// ``` |
2234 | /// [positional arguments]: Arg::index() |
2235 | /// [index]: Arg::index() |
2236 | #[inline ] |
2237 | #[must_use ] |
2238 | pub fn display_order(mut self, ord: impl IntoResettable<usize>) -> Self { |
2239 | self.disp_ord = ord.into_resettable().into_option(); |
2240 | self |
2241 | } |
2242 | |
2243 | /// Override the [current] help section. |
2244 | /// |
2245 | /// [current]: crate::Command::next_help_heading |
2246 | #[inline ] |
2247 | #[must_use ] |
2248 | pub fn help_heading(mut self, heading: impl IntoResettable<Str>) -> Self { |
2249 | self.help_heading = Some(heading.into_resettable().into_option()); |
2250 | self |
2251 | } |
2252 | |
2253 | /// Render the [help][Arg::help] on the line after the argument. |
2254 | /// |
2255 | /// This can be helpful for arguments with very long or complex help messages. |
2256 | /// This can also be helpful for arguments with very long flag names, or many/long value names. |
2257 | /// |
2258 | /// **NOTE:** To apply this setting to all arguments and subcommands, consider using |
2259 | /// [`crate::Command::next_line_help`] |
2260 | /// |
2261 | /// # Examples |
2262 | /// |
2263 | /// ```rust |
2264 | /// # #[cfg (feature = "help" )] { |
2265 | /// # use clap_builder as clap; |
2266 | /// # use clap::{Command, Arg, ArgAction}; |
2267 | /// let m = Command::new("prog" ) |
2268 | /// .arg(Arg::new("opt" ) |
2269 | /// .long("long-option-flag" ) |
2270 | /// .short('o' ) |
2271 | /// .action(ArgAction::Set) |
2272 | /// .next_line_help(true) |
2273 | /// .value_names(["value1" , "value2" ]) |
2274 | /// .help("Some really long help and complex \n\ |
2275 | /// help that makes more sense to be \n\ |
2276 | /// on a line after the option" )) |
2277 | /// .get_matches_from(vec![ |
2278 | /// "prog" , "--help" |
2279 | /// ]); |
2280 | /// # } |
2281 | /// ``` |
2282 | /// |
2283 | /// The above example displays the following help message |
2284 | /// |
2285 | /// ```text |
2286 | /// nlh |
2287 | /// |
2288 | /// Usage: nlh [OPTIONS] |
2289 | /// |
2290 | /// Options: |
2291 | /// -h, --help Print help information |
2292 | /// -V, --version Print version information |
2293 | /// -o, --long-option-flag <value1> <value2> |
2294 | /// Some really long help and complex |
2295 | /// help that makes more sense to be |
2296 | /// on a line after the option |
2297 | /// ``` |
2298 | #[inline ] |
2299 | #[must_use ] |
2300 | pub fn next_line_help(self, yes: bool) -> Self { |
2301 | if yes { |
2302 | self.setting(ArgSettings::NextLineHelp) |
2303 | } else { |
2304 | self.unset_setting(ArgSettings::NextLineHelp) |
2305 | } |
2306 | } |
2307 | |
2308 | /// Do not display the argument in help message. |
2309 | /// |
2310 | /// **NOTE:** This does **not** hide the argument from usage strings on error |
2311 | /// |
2312 | /// # Examples |
2313 | /// |
2314 | /// Setting `Hidden` will hide the argument when displaying help text |
2315 | /// |
2316 | /// ```rust |
2317 | /// # #[cfg (feature = "help" )] { |
2318 | /// # use clap_builder as clap; |
2319 | /// # use clap::{Command, Arg}; |
2320 | /// let m = Command::new("prog" ) |
2321 | /// .arg(Arg::new("cfg" ) |
2322 | /// .long("config" ) |
2323 | /// .hide(true) |
2324 | /// .help("Some help text describing the --config arg" )) |
2325 | /// .get_matches_from(vec![ |
2326 | /// "prog" , "--help" |
2327 | /// ]); |
2328 | /// # } |
2329 | /// ``` |
2330 | /// |
2331 | /// The above example displays |
2332 | /// |
2333 | /// ```text |
2334 | /// helptest |
2335 | /// |
2336 | /// Usage: helptest [OPTIONS] |
2337 | /// |
2338 | /// Options: |
2339 | /// -h, --help Print help information |
2340 | /// -V, --version Print version information |
2341 | /// ``` |
2342 | #[inline ] |
2343 | #[must_use ] |
2344 | pub fn hide(self, yes: bool) -> Self { |
2345 | if yes { |
2346 | self.setting(ArgSettings::Hidden) |
2347 | } else { |
2348 | self.unset_setting(ArgSettings::Hidden) |
2349 | } |
2350 | } |
2351 | |
2352 | /// Do not display the [possible values][crate::builder::ValueParser::possible_values] in the help message. |
2353 | /// |
2354 | /// This is useful for args with many values, or ones which are explained elsewhere in the |
2355 | /// help text. |
2356 | /// |
2357 | /// **NOTE:** Setting this requires [taking values][Arg::num_args] |
2358 | /// |
2359 | /// To set this for all arguments, see |
2360 | /// [`Command::hide_possible_values`][crate::Command::hide_possible_values]. |
2361 | /// |
2362 | /// # Examples |
2363 | /// |
2364 | /// ```rust |
2365 | /// # use clap_builder as clap; |
2366 | /// # use clap::{Command, Arg, ArgAction}; |
2367 | /// let m = Command::new("prog" ) |
2368 | /// .arg(Arg::new("mode" ) |
2369 | /// .long("mode" ) |
2370 | /// .value_parser(["fast" , "slow" ]) |
2371 | /// .action(ArgAction::Set) |
2372 | /// .hide_possible_values(true)); |
2373 | /// ``` |
2374 | /// If we were to run the above program with `--help` the `[values: fast, slow]` portion of |
2375 | /// the help text would be omitted. |
2376 | #[inline ] |
2377 | #[must_use ] |
2378 | pub fn hide_possible_values(self, yes: bool) -> Self { |
2379 | if yes { |
2380 | self.setting(ArgSettings::HidePossibleValues) |
2381 | } else { |
2382 | self.unset_setting(ArgSettings::HidePossibleValues) |
2383 | } |
2384 | } |
2385 | |
2386 | /// Do not display the default value of the argument in the help message. |
2387 | /// |
2388 | /// This is useful when default behavior of an arg is explained elsewhere in the help text. |
2389 | /// |
2390 | /// **NOTE:** Setting this requires [taking values][Arg::num_args] |
2391 | /// |
2392 | /// # Examples |
2393 | /// |
2394 | /// ```rust |
2395 | /// # use clap_builder as clap; |
2396 | /// # use clap::{Command, Arg, ArgAction}; |
2397 | /// let m = Command::new("connect" ) |
2398 | /// .arg(Arg::new("host" ) |
2399 | /// .long("host" ) |
2400 | /// .default_value("localhost" ) |
2401 | /// .action(ArgAction::Set) |
2402 | /// .hide_default_value(true)); |
2403 | /// |
2404 | /// ``` |
2405 | /// |
2406 | /// If we were to run the above program with `--help` the `[default: localhost]` portion of |
2407 | /// the help text would be omitted. |
2408 | #[inline ] |
2409 | #[must_use ] |
2410 | pub fn hide_default_value(self, yes: bool) -> Self { |
2411 | if yes { |
2412 | self.setting(ArgSettings::HideDefaultValue) |
2413 | } else { |
2414 | self.unset_setting(ArgSettings::HideDefaultValue) |
2415 | } |
2416 | } |
2417 | |
2418 | /// Do not display in help the environment variable name. |
2419 | /// |
2420 | /// This is useful when the variable option is explained elsewhere in the help text. |
2421 | /// |
2422 | /// # Examples |
2423 | /// |
2424 | /// ```rust |
2425 | /// # use clap_builder as clap; |
2426 | /// # use clap::{Command, Arg, ArgAction}; |
2427 | /// let m = Command::new("prog") |
2428 | /// .arg(Arg::new("mode") |
2429 | /// .long("mode") |
2430 | /// .env("MODE") |
2431 | /// .action(ArgAction::Set) |
2432 | /// .hide_env(true)); |
2433 | /// ``` |
2434 | /// |
2435 | /// If we were to run the above program with `--help` the `[env: MODE]` portion of the help |
2436 | /// text would be omitted. |
2437 | #[cfg (feature = "env" )] |
2438 | #[inline ] |
2439 | #[must_use ] |
2440 | pub fn hide_env(self, yes: bool) -> Self { |
2441 | if yes { |
2442 | self.setting(ArgSettings::HideEnv) |
2443 | } else { |
2444 | self.unset_setting(ArgSettings::HideEnv) |
2445 | } |
2446 | } |
2447 | |
2448 | /// Do not display in help any values inside the associated ENV variables for the argument. |
2449 | /// |
2450 | /// This is useful when ENV vars contain sensitive values. |
2451 | /// |
2452 | /// # Examples |
2453 | /// |
2454 | /// ```rust |
2455 | /// # use clap_builder as clap; |
2456 | /// # use clap::{Command, Arg, ArgAction}; |
2457 | /// let m = Command::new("connect") |
2458 | /// .arg(Arg::new("host") |
2459 | /// .long("host") |
2460 | /// .env("CONNECT") |
2461 | /// .action(ArgAction::Set) |
2462 | /// .hide_env_values(true)); |
2463 | /// |
2464 | /// ``` |
2465 | /// |
2466 | /// If we were to run the above program with `$ CONNECT=super_secret connect --help` the |
2467 | /// `[default: CONNECT=super_secret]` portion of the help text would be omitted. |
2468 | #[cfg (feature = "env" )] |
2469 | #[inline ] |
2470 | #[must_use ] |
2471 | pub fn hide_env_values(self, yes: bool) -> Self { |
2472 | if yes { |
2473 | self.setting(ArgSettings::HideEnvValues) |
2474 | } else { |
2475 | self.unset_setting(ArgSettings::HideEnvValues) |
2476 | } |
2477 | } |
2478 | |
2479 | /// Hides an argument from short help (`-h`). |
2480 | /// |
2481 | /// **NOTE:** This does **not** hide the argument from usage strings on error |
2482 | /// |
2483 | /// **NOTE:** Setting this option will cause next-line-help output style to be used |
2484 | /// when long help (`--help`) is called. |
2485 | /// |
2486 | /// # Examples |
2487 | /// |
2488 | /// ```rust |
2489 | /// # use clap_builder as clap; |
2490 | /// # use clap::{Command, Arg}; |
2491 | /// Arg::new("debug" ) |
2492 | /// .hide_short_help(true); |
2493 | /// ``` |
2494 | /// |
2495 | /// Setting `hide_short_help(true)` will hide the argument when displaying short help text |
2496 | /// |
2497 | /// ```rust |
2498 | /// # #[cfg (feature = "help" )] { |
2499 | /// # use clap_builder as clap; |
2500 | /// # use clap::{Command, Arg}; |
2501 | /// let m = Command::new("prog" ) |
2502 | /// .arg(Arg::new("cfg" ) |
2503 | /// .long("config" ) |
2504 | /// .hide_short_help(true) |
2505 | /// .help("Some help text describing the --config arg" )) |
2506 | /// .get_matches_from(vec![ |
2507 | /// "prog" , "-h" |
2508 | /// ]); |
2509 | /// # } |
2510 | /// ``` |
2511 | /// |
2512 | /// The above example displays |
2513 | /// |
2514 | /// ```text |
2515 | /// helptest |
2516 | /// |
2517 | /// Usage: helptest [OPTIONS] |
2518 | /// |
2519 | /// Options: |
2520 | /// -h, --help Print help information |
2521 | /// -V, --version Print version information |
2522 | /// ``` |
2523 | /// |
2524 | /// However, when --help is called |
2525 | /// |
2526 | /// ```rust |
2527 | /// # #[cfg (feature = "help" )] { |
2528 | /// # use clap_builder as clap; |
2529 | /// # use clap::{Command, Arg}; |
2530 | /// let m = Command::new("prog" ) |
2531 | /// .arg(Arg::new("cfg" ) |
2532 | /// .long("config" ) |
2533 | /// .hide_short_help(true) |
2534 | /// .help("Some help text describing the --config arg" )) |
2535 | /// .get_matches_from(vec![ |
2536 | /// "prog" , "--help" |
2537 | /// ]); |
2538 | /// # } |
2539 | /// ``` |
2540 | /// |
2541 | /// Then the following would be displayed |
2542 | /// |
2543 | /// ```text |
2544 | /// helptest |
2545 | /// |
2546 | /// Usage: helptest [OPTIONS] |
2547 | /// |
2548 | /// Options: |
2549 | /// --config Some help text describing the --config arg |
2550 | /// -h, --help Print help information |
2551 | /// -V, --version Print version information |
2552 | /// ``` |
2553 | #[inline ] |
2554 | #[must_use ] |
2555 | pub fn hide_short_help(self, yes: bool) -> Self { |
2556 | if yes { |
2557 | self.setting(ArgSettings::HiddenShortHelp) |
2558 | } else { |
2559 | self.unset_setting(ArgSettings::HiddenShortHelp) |
2560 | } |
2561 | } |
2562 | |
2563 | /// Hides an argument from long help (`--help`). |
2564 | /// |
2565 | /// **NOTE:** This does **not** hide the argument from usage strings on error |
2566 | /// |
2567 | /// **NOTE:** Setting this option will cause next-line-help output style to be used |
2568 | /// when long help (`--help`) is called. |
2569 | /// |
2570 | /// # Examples |
2571 | /// |
2572 | /// Setting `hide_long_help(true)` will hide the argument when displaying long help text |
2573 | /// |
2574 | /// ```rust |
2575 | /// # #[cfg (feature = "help" )] { |
2576 | /// # use clap_builder as clap; |
2577 | /// # use clap::{Command, Arg}; |
2578 | /// let m = Command::new("prog" ) |
2579 | /// .arg(Arg::new("cfg" ) |
2580 | /// .long("config" ) |
2581 | /// .hide_long_help(true) |
2582 | /// .help("Some help text describing the --config arg" )) |
2583 | /// .get_matches_from(vec![ |
2584 | /// "prog" , "--help" |
2585 | /// ]); |
2586 | /// # } |
2587 | /// ``` |
2588 | /// |
2589 | /// The above example displays |
2590 | /// |
2591 | /// ```text |
2592 | /// helptest |
2593 | /// |
2594 | /// Usage: helptest [OPTIONS] |
2595 | /// |
2596 | /// Options: |
2597 | /// -h, --help Print help information |
2598 | /// -V, --version Print version information |
2599 | /// ``` |
2600 | /// |
2601 | /// However, when -h is called |
2602 | /// |
2603 | /// ```rust |
2604 | /// # #[cfg (feature = "help" )] { |
2605 | /// # use clap_builder as clap; |
2606 | /// # use clap::{Command, Arg}; |
2607 | /// let m = Command::new("prog" ) |
2608 | /// .arg(Arg::new("cfg" ) |
2609 | /// .long("config" ) |
2610 | /// .hide_long_help(true) |
2611 | /// .help("Some help text describing the --config arg" )) |
2612 | /// .get_matches_from(vec![ |
2613 | /// "prog" , "-h" |
2614 | /// ]); |
2615 | /// # } |
2616 | /// ``` |
2617 | /// |
2618 | /// Then the following would be displayed |
2619 | /// |
2620 | /// ```text |
2621 | /// helptest |
2622 | /// |
2623 | /// Usage: helptest [OPTIONS] |
2624 | /// |
2625 | /// OPTIONS: |
2626 | /// --config Some help text describing the --config arg |
2627 | /// -h, --help Print help information |
2628 | /// -V, --version Print version information |
2629 | /// ``` |
2630 | #[inline ] |
2631 | #[must_use ] |
2632 | pub fn hide_long_help(self, yes: bool) -> Self { |
2633 | if yes { |
2634 | self.setting(ArgSettings::HiddenLongHelp) |
2635 | } else { |
2636 | self.unset_setting(ArgSettings::HiddenLongHelp) |
2637 | } |
2638 | } |
2639 | } |
2640 | |
2641 | /// # Advanced Argument Relations |
2642 | impl Arg { |
2643 | /// The name of the [`ArgGroup`] the argument belongs to. |
2644 | /// |
2645 | /// # Examples |
2646 | /// |
2647 | /// ```rust |
2648 | /// # use clap_builder as clap; |
2649 | /// # use clap::{Command, Arg, ArgAction}; |
2650 | /// Arg::new("debug" ) |
2651 | /// .long("debug" ) |
2652 | /// .action(ArgAction::SetTrue) |
2653 | /// .group("mode" ) |
2654 | /// # ; |
2655 | /// ``` |
2656 | /// |
2657 | /// Multiple arguments can be a member of a single group and then the group checked as if it |
2658 | /// was one of said arguments. |
2659 | /// |
2660 | /// ```rust |
2661 | /// # use clap_builder as clap; |
2662 | /// # use clap::{Command, Arg, ArgAction}; |
2663 | /// let m = Command::new("prog" ) |
2664 | /// .arg(Arg::new("debug" ) |
2665 | /// .long("debug" ) |
2666 | /// .action(ArgAction::SetTrue) |
2667 | /// .group("mode" )) |
2668 | /// .arg(Arg::new("verbose" ) |
2669 | /// .long("verbose" ) |
2670 | /// .action(ArgAction::SetTrue) |
2671 | /// .group("mode" )) |
2672 | /// .get_matches_from(vec![ |
2673 | /// "prog" , "--debug" |
2674 | /// ]); |
2675 | /// assert!(m.contains_id("mode" )); |
2676 | /// ``` |
2677 | /// |
2678 | /// [`ArgGroup`]: crate::ArgGroup |
2679 | #[must_use ] |
2680 | pub fn group(mut self, group_id: impl IntoResettable<Id>) -> Self { |
2681 | if let Some(group_id) = group_id.into_resettable().into_option() { |
2682 | self.groups.push(group_id); |
2683 | } else { |
2684 | self.groups.clear(); |
2685 | } |
2686 | self |
2687 | } |
2688 | |
2689 | /// The names of [`ArgGroup`]'s the argument belongs to. |
2690 | /// |
2691 | /// # Examples |
2692 | /// |
2693 | /// ```rust |
2694 | /// # use clap_builder as clap; |
2695 | /// # use clap::{Command, Arg, ArgAction}; |
2696 | /// Arg::new("debug" ) |
2697 | /// .long("debug" ) |
2698 | /// .action(ArgAction::SetTrue) |
2699 | /// .groups(["mode" , "verbosity" ]) |
2700 | /// # ; |
2701 | /// ``` |
2702 | /// |
2703 | /// Arguments can be members of multiple groups and then the group checked as if it |
2704 | /// was one of said arguments. |
2705 | /// |
2706 | /// ```rust |
2707 | /// # use clap_builder as clap; |
2708 | /// # use clap::{Command, Arg, ArgAction}; |
2709 | /// let m = Command::new("prog" ) |
2710 | /// .arg(Arg::new("debug" ) |
2711 | /// .long("debug" ) |
2712 | /// .action(ArgAction::SetTrue) |
2713 | /// .groups(["mode" , "verbosity" ])) |
2714 | /// .arg(Arg::new("verbose" ) |
2715 | /// .long("verbose" ) |
2716 | /// .action(ArgAction::SetTrue) |
2717 | /// .groups(["mode" , "verbosity" ])) |
2718 | /// .get_matches_from(vec![ |
2719 | /// "prog" , "--debug" |
2720 | /// ]); |
2721 | /// assert!(m.contains_id("mode" )); |
2722 | /// assert!(m.contains_id("verbosity" )); |
2723 | /// ``` |
2724 | /// |
2725 | /// [`ArgGroup`]: crate::ArgGroup |
2726 | #[must_use ] |
2727 | pub fn groups(mut self, group_ids: impl IntoIterator<Item = impl Into<Id>>) -> Self { |
2728 | self.groups.extend(group_ids.into_iter().map(Into::into)); |
2729 | self |
2730 | } |
2731 | |
2732 | /// Specifies the value of the argument if `arg` has been used at runtime. |
2733 | /// |
2734 | /// If `default` is set to `None`, `default_value` will be removed. |
2735 | /// |
2736 | /// **NOTE:** This setting is perfectly compatible with [`Arg::default_value`] but slightly |
2737 | /// different. `Arg::default_value` *only* takes effect when the user has not provided this arg |
2738 | /// at runtime. This setting however only takes effect when the user has not provided a value at |
2739 | /// runtime **and** these other conditions are met as well. If you have set `Arg::default_value` |
2740 | /// and `Arg::default_value_if`, and the user **did not** provide this arg at runtime, nor were |
2741 | /// the conditions met for `Arg::default_value_if`, the `Arg::default_value` will be applied. |
2742 | /// |
2743 | /// Like with command-line values, this will be split by [`Arg::value_delimiter`]. |
2744 | /// |
2745 | /// # Examples |
2746 | /// |
2747 | /// First we use the default value only if another arg is present at runtime. |
2748 | /// |
2749 | /// ```rust |
2750 | /// # use clap_builder as clap; |
2751 | /// # use clap::{Command, Arg, ArgAction}; |
2752 | /// # use clap::builder::{ArgPredicate}; |
2753 | /// let m = Command::new("prog" ) |
2754 | /// .arg(Arg::new("flag" ) |
2755 | /// .long("flag" ) |
2756 | /// .action(ArgAction::SetTrue)) |
2757 | /// .arg(Arg::new("other" ) |
2758 | /// .long("other" ) |
2759 | /// .default_value_if("flag" , ArgPredicate::IsPresent, Some("default" ))) |
2760 | /// .get_matches_from(vec![ |
2761 | /// "prog" , "--flag" |
2762 | /// ]); |
2763 | /// |
2764 | /// assert_eq!(m.get_one::<String>("other" ).unwrap(), "default" ); |
2765 | /// ``` |
2766 | /// |
2767 | /// Next we run the same test, but without providing `--flag`. |
2768 | /// |
2769 | /// ```rust |
2770 | /// # use clap_builder as clap; |
2771 | /// # use clap::{Command, Arg, ArgAction}; |
2772 | /// let m = Command::new("prog" ) |
2773 | /// .arg(Arg::new("flag" ) |
2774 | /// .long("flag" ) |
2775 | /// .action(ArgAction::SetTrue)) |
2776 | /// .arg(Arg::new("other" ) |
2777 | /// .long("other" ) |
2778 | /// .default_value_if("flag" , "true" , Some("default" ))) |
2779 | /// .get_matches_from(vec![ |
2780 | /// "prog" |
2781 | /// ]); |
2782 | /// |
2783 | /// assert_eq!(m.get_one::<String>("other" ), None); |
2784 | /// ``` |
2785 | /// |
2786 | /// Now lets only use the default value if `--opt` contains the value `special`. |
2787 | /// |
2788 | /// ```rust |
2789 | /// # use clap_builder as clap; |
2790 | /// # use clap::{Command, Arg, ArgAction}; |
2791 | /// let m = Command::new("prog" ) |
2792 | /// .arg(Arg::new("opt" ) |
2793 | /// .action(ArgAction::Set) |
2794 | /// .long("opt" )) |
2795 | /// .arg(Arg::new("other" ) |
2796 | /// .long("other" ) |
2797 | /// .default_value_if("opt" , "special" , Some("default" ))) |
2798 | /// .get_matches_from(vec![ |
2799 | /// "prog" , "--opt" , "special" |
2800 | /// ]); |
2801 | /// |
2802 | /// assert_eq!(m.get_one::<String>("other" ).unwrap(), "default" ); |
2803 | /// ``` |
2804 | /// |
2805 | /// We can run the same test and provide any value *other than* `special` and we won't get a |
2806 | /// default value. |
2807 | /// |
2808 | /// ```rust |
2809 | /// # use clap_builder as clap; |
2810 | /// # use clap::{Command, Arg, ArgAction}; |
2811 | /// let m = Command::new("prog" ) |
2812 | /// .arg(Arg::new("opt" ) |
2813 | /// .action(ArgAction::Set) |
2814 | /// .long("opt" )) |
2815 | /// .arg(Arg::new("other" ) |
2816 | /// .long("other" ) |
2817 | /// .default_value_if("opt" , "special" , Some("default" ))) |
2818 | /// .get_matches_from(vec![ |
2819 | /// "prog" , "--opt" , "hahaha" |
2820 | /// ]); |
2821 | /// |
2822 | /// assert_eq!(m.get_one::<String>("other" ), None); |
2823 | /// ``` |
2824 | /// |
2825 | /// If we want to unset the default value for an Arg based on the presence or |
2826 | /// value of some other Arg. |
2827 | /// |
2828 | /// ```rust |
2829 | /// # use clap_builder as clap; |
2830 | /// # use clap::{Command, Arg, ArgAction}; |
2831 | /// let m = Command::new("prog" ) |
2832 | /// .arg(Arg::new("flag" ) |
2833 | /// .long("flag" ) |
2834 | /// .action(ArgAction::SetTrue)) |
2835 | /// .arg(Arg::new("other" ) |
2836 | /// .long("other" ) |
2837 | /// .default_value("default" ) |
2838 | /// .default_value_if("flag" , "true" , None)) |
2839 | /// .get_matches_from(vec![ |
2840 | /// "prog" , "--flag" |
2841 | /// ]); |
2842 | /// |
2843 | /// assert_eq!(m.get_one::<String>("other" ), None); |
2844 | /// ``` |
2845 | /// [`Arg::action(ArgAction::Set)`]: Arg::action() |
2846 | /// [`Arg::default_value`]: Arg::default_value() |
2847 | #[must_use ] |
2848 | pub fn default_value_if( |
2849 | mut self, |
2850 | arg_id: impl Into<Id>, |
2851 | predicate: impl Into<ArgPredicate>, |
2852 | default: impl IntoResettable<OsStr>, |
2853 | ) -> Self { |
2854 | self.default_vals_ifs.push(( |
2855 | arg_id.into(), |
2856 | predicate.into(), |
2857 | default.into_resettable().into_option(), |
2858 | )); |
2859 | self |
2860 | } |
2861 | |
2862 | #[must_use ] |
2863 | #[doc (hidden)] |
2864 | #[cfg_attr ( |
2865 | feature = "deprecated" , |
2866 | deprecated(since = "4.0.0" , note = "Replaced with `Arg::default_value_if`" ) |
2867 | )] |
2868 | pub fn default_value_if_os( |
2869 | self, |
2870 | arg_id: impl Into<Id>, |
2871 | predicate: impl Into<ArgPredicate>, |
2872 | default: impl IntoResettable<OsStr>, |
2873 | ) -> Self { |
2874 | self.default_value_if(arg_id, predicate, default) |
2875 | } |
2876 | |
2877 | /// Specifies multiple values and conditions in the same manner as [`Arg::default_value_if`]. |
2878 | /// |
2879 | /// The method takes a slice of tuples in the `(arg, predicate, default)` format. |
2880 | /// |
2881 | /// **NOTE**: The conditions are stored in order and evaluated in the same order. I.e. the first |
2882 | /// if multiple conditions are true, the first one found will be applied and the ultimate value. |
2883 | /// |
2884 | /// Like with command-line values, this will be split by [`Arg::value_delimiter`]. |
2885 | /// |
2886 | /// # Examples |
2887 | /// |
2888 | /// First we use the default value only if another arg is present at runtime. |
2889 | /// |
2890 | /// ```rust |
2891 | /// # use clap_builder as clap; |
2892 | /// # use clap::{Command, Arg, ArgAction}; |
2893 | /// let m = Command::new("prog" ) |
2894 | /// .arg(Arg::new("flag" ) |
2895 | /// .long("flag" ) |
2896 | /// .action(ArgAction::SetTrue)) |
2897 | /// .arg(Arg::new("opt" ) |
2898 | /// .long("opt" ) |
2899 | /// .action(ArgAction::Set)) |
2900 | /// .arg(Arg::new("other" ) |
2901 | /// .long("other" ) |
2902 | /// .default_value_ifs([ |
2903 | /// ("flag" , "true" , Some("default" )), |
2904 | /// ("opt" , "channal" , Some("chan" )), |
2905 | /// ])) |
2906 | /// .get_matches_from(vec![ |
2907 | /// "prog" , "--opt" , "channal" |
2908 | /// ]); |
2909 | /// |
2910 | /// assert_eq!(m.get_one::<String>("other" ).unwrap(), "chan" ); |
2911 | /// ``` |
2912 | /// |
2913 | /// Next we run the same test, but without providing `--flag`. |
2914 | /// |
2915 | /// ```rust |
2916 | /// # use clap_builder as clap; |
2917 | /// # use clap::{Command, Arg, ArgAction}; |
2918 | /// let m = Command::new("prog" ) |
2919 | /// .arg(Arg::new("flag" ) |
2920 | /// .long("flag" ) |
2921 | /// .action(ArgAction::SetTrue)) |
2922 | /// .arg(Arg::new("other" ) |
2923 | /// .long("other" ) |
2924 | /// .default_value_ifs([ |
2925 | /// ("flag" , "true" , Some("default" )), |
2926 | /// ("opt" , "channal" , Some("chan" )), |
2927 | /// ])) |
2928 | /// .get_matches_from(vec![ |
2929 | /// "prog" |
2930 | /// ]); |
2931 | /// |
2932 | /// assert_eq!(m.get_one::<String>("other" ), None); |
2933 | /// ``` |
2934 | /// |
2935 | /// We can also see that these values are applied in order, and if more than one condition is |
2936 | /// true, only the first evaluated "wins" |
2937 | /// |
2938 | /// ```rust |
2939 | /// # use clap_builder as clap; |
2940 | /// # use clap::{Command, Arg, ArgAction}; |
2941 | /// # use clap::builder::ArgPredicate; |
2942 | /// let m = Command::new("prog" ) |
2943 | /// .arg(Arg::new("flag" ) |
2944 | /// .long("flag" ) |
2945 | /// .action(ArgAction::SetTrue)) |
2946 | /// .arg(Arg::new("opt" ) |
2947 | /// .long("opt" ) |
2948 | /// .action(ArgAction::Set)) |
2949 | /// .arg(Arg::new("other" ) |
2950 | /// .long("other" ) |
2951 | /// .default_value_ifs([ |
2952 | /// ("flag" , ArgPredicate::IsPresent, Some("default" )), |
2953 | /// ("opt" , ArgPredicate::Equals("channal" .into()), Some("chan" )), |
2954 | /// ])) |
2955 | /// .get_matches_from(vec![ |
2956 | /// "prog" , "--opt" , "channal" , "--flag" |
2957 | /// ]); |
2958 | /// |
2959 | /// assert_eq!(m.get_one::<String>("other" ).unwrap(), "default" ); |
2960 | /// ``` |
2961 | /// [`Arg::action(ArgAction::Set)`]: Arg::action() |
2962 | /// [`Arg::default_value_if`]: Arg::default_value_if() |
2963 | #[must_use ] |
2964 | pub fn default_value_ifs( |
2965 | mut self, |
2966 | ifs: impl IntoIterator< |
2967 | Item = ( |
2968 | impl Into<Id>, |
2969 | impl Into<ArgPredicate>, |
2970 | impl IntoResettable<OsStr>, |
2971 | ), |
2972 | >, |
2973 | ) -> Self { |
2974 | for (arg, predicate, default) in ifs { |
2975 | self = self.default_value_if(arg, predicate, default); |
2976 | } |
2977 | self |
2978 | } |
2979 | |
2980 | #[must_use ] |
2981 | #[doc (hidden)] |
2982 | #[cfg_attr ( |
2983 | feature = "deprecated" , |
2984 | deprecated(since = "4.0.0" , note = "Replaced with `Arg::default_value_ifs`" ) |
2985 | )] |
2986 | pub fn default_value_ifs_os( |
2987 | self, |
2988 | ifs: impl IntoIterator< |
2989 | Item = ( |
2990 | impl Into<Id>, |
2991 | impl Into<ArgPredicate>, |
2992 | impl IntoResettable<OsStr>, |
2993 | ), |
2994 | >, |
2995 | ) -> Self { |
2996 | self.default_value_ifs(ifs) |
2997 | } |
2998 | |
2999 | /// Set this arg as [required] as long as the specified argument is not present at runtime. |
3000 | /// |
3001 | /// **Pro Tip:** Using `Arg::required_unless_present` implies [`Arg::required`] and is therefore not |
3002 | /// mandatory to also set. |
3003 | /// |
3004 | /// # Examples |
3005 | /// |
3006 | /// ```rust |
3007 | /// # use clap_builder as clap; |
3008 | /// # use clap::Arg; |
3009 | /// Arg::new("config" ) |
3010 | /// .required_unless_present("debug" ) |
3011 | /// # ; |
3012 | /// ``` |
3013 | /// |
3014 | /// In the following example, the required argument is *not* provided, |
3015 | /// but it's not an error because the `unless` arg has been supplied. |
3016 | /// |
3017 | /// ```rust |
3018 | /// # use clap_builder as clap; |
3019 | /// # use clap::{Command, Arg, ArgAction}; |
3020 | /// let res = Command::new("prog" ) |
3021 | /// .arg(Arg::new("cfg" ) |
3022 | /// .required_unless_present("dbg" ) |
3023 | /// .action(ArgAction::Set) |
3024 | /// .long("config" )) |
3025 | /// .arg(Arg::new("dbg" ) |
3026 | /// .long("debug" ) |
3027 | /// .action(ArgAction::SetTrue)) |
3028 | /// .try_get_matches_from(vec![ |
3029 | /// "prog" , "--debug" |
3030 | /// ]); |
3031 | /// |
3032 | /// assert!(res.is_ok()); |
3033 | /// ``` |
3034 | /// |
3035 | /// Setting `Arg::required_unless_present(name)` and *not* supplying `name` or this arg is an error. |
3036 | /// |
3037 | /// ```rust |
3038 | /// # use clap_builder as clap; |
3039 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
3040 | /// let res = Command::new("prog" ) |
3041 | /// .arg(Arg::new("cfg" ) |
3042 | /// .required_unless_present("dbg" ) |
3043 | /// .action(ArgAction::Set) |
3044 | /// .long("config" )) |
3045 | /// .arg(Arg::new("dbg" ) |
3046 | /// .long("debug" )) |
3047 | /// .try_get_matches_from(vec![ |
3048 | /// "prog" |
3049 | /// ]); |
3050 | /// |
3051 | /// assert!(res.is_err()); |
3052 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
3053 | /// ``` |
3054 | /// [required]: Arg::required() |
3055 | #[must_use ] |
3056 | pub fn required_unless_present(mut self, arg_id: impl IntoResettable<Id>) -> Self { |
3057 | if let Some(arg_id) = arg_id.into_resettable().into_option() { |
3058 | self.r_unless.push(arg_id); |
3059 | } else { |
3060 | self.r_unless.clear(); |
3061 | } |
3062 | self |
3063 | } |
3064 | |
3065 | /// Sets this arg as [required] unless *all* of the specified arguments are present at runtime. |
3066 | /// |
3067 | /// In other words, parsing will succeed only if user either |
3068 | /// * supplies the `self` arg. |
3069 | /// * supplies *all* of the `names` arguments. |
3070 | /// |
3071 | /// **NOTE:** If you wish for this argument to only be required unless *any of* these args are |
3072 | /// present see [`Arg::required_unless_present_any`] |
3073 | /// |
3074 | /// # Examples |
3075 | /// |
3076 | /// ```rust |
3077 | /// # use clap_builder as clap; |
3078 | /// # use clap::Arg; |
3079 | /// Arg::new("config" ) |
3080 | /// .required_unless_present_all(["cfg" , "dbg" ]) |
3081 | /// # ; |
3082 | /// ``` |
3083 | /// |
3084 | /// In the following example, the required argument is *not* provided, but it's not an error |
3085 | /// because *all* of the `names` args have been supplied. |
3086 | /// |
3087 | /// ```rust |
3088 | /// # use clap_builder as clap; |
3089 | /// # use clap::{Command, Arg, ArgAction}; |
3090 | /// let res = Command::new("prog" ) |
3091 | /// .arg(Arg::new("cfg" ) |
3092 | /// .required_unless_present_all(["dbg" , "infile" ]) |
3093 | /// .action(ArgAction::Set) |
3094 | /// .long("config" )) |
3095 | /// .arg(Arg::new("dbg" ) |
3096 | /// .long("debug" ) |
3097 | /// .action(ArgAction::SetTrue)) |
3098 | /// .arg(Arg::new("infile" ) |
3099 | /// .short('i' ) |
3100 | /// .action(ArgAction::Set)) |
3101 | /// .try_get_matches_from(vec![ |
3102 | /// "prog" , "--debug" , "-i" , "file" |
3103 | /// ]); |
3104 | /// |
3105 | /// assert!(res.is_ok()); |
3106 | /// ``` |
3107 | /// |
3108 | /// Setting [`Arg::required_unless_present_all(names)`] and *not* supplying |
3109 | /// either *all* of `unless` args or the `self` arg is an error. |
3110 | /// |
3111 | /// ```rust |
3112 | /// # use clap_builder as clap; |
3113 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
3114 | /// let res = Command::new("prog" ) |
3115 | /// .arg(Arg::new("cfg" ) |
3116 | /// .required_unless_present_all(["dbg" , "infile" ]) |
3117 | /// .action(ArgAction::Set) |
3118 | /// .long("config" )) |
3119 | /// .arg(Arg::new("dbg" ) |
3120 | /// .long("debug" ) |
3121 | /// .action(ArgAction::SetTrue)) |
3122 | /// .arg(Arg::new("infile" ) |
3123 | /// .short('i' ) |
3124 | /// .action(ArgAction::Set)) |
3125 | /// .try_get_matches_from(vec![ |
3126 | /// "prog" |
3127 | /// ]); |
3128 | /// |
3129 | /// assert!(res.is_err()); |
3130 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
3131 | /// ``` |
3132 | /// [required]: Arg::required() |
3133 | /// [`Arg::required_unless_present_any`]: Arg::required_unless_present_any() |
3134 | /// [`Arg::required_unless_present_all(names)`]: Arg::required_unless_present_all() |
3135 | #[must_use ] |
3136 | pub fn required_unless_present_all( |
3137 | mut self, |
3138 | names: impl IntoIterator<Item = impl Into<Id>>, |
3139 | ) -> Self { |
3140 | self.r_unless_all.extend(names.into_iter().map(Into::into)); |
3141 | self |
3142 | } |
3143 | |
3144 | /// Sets this arg as [required] unless *any* of the specified arguments are present at runtime. |
3145 | /// |
3146 | /// In other words, parsing will succeed only if user either |
3147 | /// * supplies the `self` arg. |
3148 | /// * supplies *one or more* of the `unless` arguments. |
3149 | /// |
3150 | /// **NOTE:** If you wish for this argument to be required unless *all of* these args are |
3151 | /// present see [`Arg::required_unless_present_all`] |
3152 | /// |
3153 | /// # Examples |
3154 | /// |
3155 | /// ```rust |
3156 | /// # use clap_builder as clap; |
3157 | /// # use clap::Arg; |
3158 | /// Arg::new("config" ) |
3159 | /// .required_unless_present_any(["cfg" , "dbg" ]) |
3160 | /// # ; |
3161 | /// ``` |
3162 | /// |
3163 | /// Setting [`Arg::required_unless_present_any(names)`] requires that the argument be used at runtime |
3164 | /// *unless* *at least one of* the args in `names` are present. In the following example, the |
3165 | /// required argument is *not* provided, but it's not an error because one the `unless` args |
3166 | /// have been supplied. |
3167 | /// |
3168 | /// ```rust |
3169 | /// # use clap_builder as clap; |
3170 | /// # use clap::{Command, Arg, ArgAction}; |
3171 | /// let res = Command::new("prog" ) |
3172 | /// .arg(Arg::new("cfg" ) |
3173 | /// .required_unless_present_any(["dbg" , "infile" ]) |
3174 | /// .action(ArgAction::Set) |
3175 | /// .long("config" )) |
3176 | /// .arg(Arg::new("dbg" ) |
3177 | /// .long("debug" ) |
3178 | /// .action(ArgAction::SetTrue)) |
3179 | /// .arg(Arg::new("infile" ) |
3180 | /// .short('i' ) |
3181 | /// .action(ArgAction::Set)) |
3182 | /// .try_get_matches_from(vec![ |
3183 | /// "prog" , "--debug" |
3184 | /// ]); |
3185 | /// |
3186 | /// assert!(res.is_ok()); |
3187 | /// ``` |
3188 | /// |
3189 | /// Setting [`Arg::required_unless_present_any(names)`] and *not* supplying *at least one of* `names` |
3190 | /// or this arg is an error. |
3191 | /// |
3192 | /// ```rust |
3193 | /// # use clap_builder as clap; |
3194 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
3195 | /// let res = Command::new("prog" ) |
3196 | /// .arg(Arg::new("cfg" ) |
3197 | /// .required_unless_present_any(["dbg" , "infile" ]) |
3198 | /// .action(ArgAction::Set) |
3199 | /// .long("config" )) |
3200 | /// .arg(Arg::new("dbg" ) |
3201 | /// .long("debug" ) |
3202 | /// .action(ArgAction::SetTrue)) |
3203 | /// .arg(Arg::new("infile" ) |
3204 | /// .short('i' ) |
3205 | /// .action(ArgAction::Set)) |
3206 | /// .try_get_matches_from(vec![ |
3207 | /// "prog" |
3208 | /// ]); |
3209 | /// |
3210 | /// assert!(res.is_err()); |
3211 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
3212 | /// ``` |
3213 | /// [required]: Arg::required() |
3214 | /// [`Arg::required_unless_present_any(names)`]: Arg::required_unless_present_any() |
3215 | /// [`Arg::required_unless_present_all`]: Arg::required_unless_present_all() |
3216 | #[must_use ] |
3217 | pub fn required_unless_present_any( |
3218 | mut self, |
3219 | names: impl IntoIterator<Item = impl Into<Id>>, |
3220 | ) -> Self { |
3221 | self.r_unless.extend(names.into_iter().map(Into::into)); |
3222 | self |
3223 | } |
3224 | |
3225 | /// This argument is [required] only if the specified `arg` is present at runtime and its value |
3226 | /// equals `val`. |
3227 | /// |
3228 | /// # Examples |
3229 | /// |
3230 | /// ```rust |
3231 | /// # use clap_builder as clap; |
3232 | /// # use clap::Arg; |
3233 | /// Arg::new("config" ) |
3234 | /// .required_if_eq("other_arg" , "value" ) |
3235 | /// # ; |
3236 | /// ``` |
3237 | /// |
3238 | /// ```rust |
3239 | /// # use clap_builder as clap; |
3240 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
3241 | /// let res = Command::new("prog" ) |
3242 | /// .arg(Arg::new("cfg" ) |
3243 | /// .action(ArgAction::Set) |
3244 | /// .required_if_eq("other" , "special" ) |
3245 | /// .long("config" )) |
3246 | /// .arg(Arg::new("other" ) |
3247 | /// .long("other" ) |
3248 | /// .action(ArgAction::Set)) |
3249 | /// .try_get_matches_from(vec![ |
3250 | /// "prog" , "--other" , "not-special" |
3251 | /// ]); |
3252 | /// |
3253 | /// assert!(res.is_ok()); // We didn't use --other=special, so "cfg" wasn't required |
3254 | /// |
3255 | /// let res = Command::new("prog" ) |
3256 | /// .arg(Arg::new("cfg" ) |
3257 | /// .action(ArgAction::Set) |
3258 | /// .required_if_eq("other" , "special" ) |
3259 | /// .long("config" )) |
3260 | /// .arg(Arg::new("other" ) |
3261 | /// .long("other" ) |
3262 | /// .action(ArgAction::Set)) |
3263 | /// .try_get_matches_from(vec![ |
3264 | /// "prog" , "--other" , "special" |
3265 | /// ]); |
3266 | /// |
3267 | /// // We did use --other=special so "cfg" had become required but was missing. |
3268 | /// assert!(res.is_err()); |
3269 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
3270 | /// |
3271 | /// let res = Command::new("prog" ) |
3272 | /// .arg(Arg::new("cfg" ) |
3273 | /// .action(ArgAction::Set) |
3274 | /// .required_if_eq("other" , "special" ) |
3275 | /// .long("config" )) |
3276 | /// .arg(Arg::new("other" ) |
3277 | /// .long("other" ) |
3278 | /// .action(ArgAction::Set)) |
3279 | /// .try_get_matches_from(vec![ |
3280 | /// "prog" , "--other" , "SPECIAL" |
3281 | /// ]); |
3282 | /// |
3283 | /// // By default, the comparison is case-sensitive, so "cfg" wasn't required |
3284 | /// assert!(res.is_ok()); |
3285 | /// |
3286 | /// let res = Command::new("prog" ) |
3287 | /// .arg(Arg::new("cfg" ) |
3288 | /// .action(ArgAction::Set) |
3289 | /// .required_if_eq("other" , "special" ) |
3290 | /// .long("config" )) |
3291 | /// .arg(Arg::new("other" ) |
3292 | /// .long("other" ) |
3293 | /// .ignore_case(true) |
3294 | /// .action(ArgAction::Set)) |
3295 | /// .try_get_matches_from(vec![ |
3296 | /// "prog" , "--other" , "SPECIAL" |
3297 | /// ]); |
3298 | /// |
3299 | /// // However, case-insensitive comparisons can be enabled. This typically occurs when using Arg::possible_values(). |
3300 | /// assert!(res.is_err()); |
3301 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
3302 | /// ``` |
3303 | /// [`Arg::requires(name)`]: Arg::requires() |
3304 | /// [Conflicting]: Arg::conflicts_with() |
3305 | /// [required]: Arg::required() |
3306 | #[must_use ] |
3307 | pub fn required_if_eq(mut self, arg_id: impl Into<Id>, val: impl Into<OsStr>) -> Self { |
3308 | self.r_ifs.push((arg_id.into(), val.into())); |
3309 | self |
3310 | } |
3311 | |
3312 | /// Specify this argument is [required] based on multiple conditions. |
3313 | /// |
3314 | /// The conditions are set up in a `(arg, val)` style tuple. The requirement will only become |
3315 | /// valid if one of the specified `arg`'s value equals its corresponding `val`. |
3316 | /// |
3317 | /// # Examples |
3318 | /// |
3319 | /// ```rust |
3320 | /// # use clap_builder as clap; |
3321 | /// # use clap::Arg; |
3322 | /// Arg::new("config" ) |
3323 | /// .required_if_eq_any([ |
3324 | /// ("extra" , "val" ), |
3325 | /// ("option" , "spec" ) |
3326 | /// ]) |
3327 | /// # ; |
3328 | /// ``` |
3329 | /// |
3330 | /// Setting `Arg::required_if_eq_any([(arg, val)])` makes this arg required if any of the `arg`s |
3331 | /// are used at runtime and it's corresponding value is equal to `val`. If the `arg`'s value is |
3332 | /// anything other than `val`, this argument isn't required. |
3333 | /// |
3334 | /// ```rust |
3335 | /// # use clap_builder as clap; |
3336 | /// # use clap::{Command, Arg, ArgAction}; |
3337 | /// let res = Command::new("prog" ) |
3338 | /// .arg(Arg::new("cfg" ) |
3339 | /// .required_if_eq_any([ |
3340 | /// ("extra" , "val" ), |
3341 | /// ("option" , "spec" ) |
3342 | /// ]) |
3343 | /// .action(ArgAction::Set) |
3344 | /// .long("config" )) |
3345 | /// .arg(Arg::new("extra" ) |
3346 | /// .action(ArgAction::Set) |
3347 | /// .long("extra" )) |
3348 | /// .arg(Arg::new("option" ) |
3349 | /// .action(ArgAction::Set) |
3350 | /// .long("option" )) |
3351 | /// .try_get_matches_from(vec![ |
3352 | /// "prog" , "--option" , "other" |
3353 | /// ]); |
3354 | /// |
3355 | /// assert!(res.is_ok()); // We didn't use --option=spec, or --extra=val so "cfg" isn't required |
3356 | /// ``` |
3357 | /// |
3358 | /// Setting `Arg::required_if_eq_any([(arg, val)])` and having any of the `arg`s used with its |
3359 | /// value of `val` but *not* using this arg is an error. |
3360 | /// |
3361 | /// ```rust |
3362 | /// # use clap_builder as clap; |
3363 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
3364 | /// let res = Command::new("prog" ) |
3365 | /// .arg(Arg::new("cfg" ) |
3366 | /// .required_if_eq_any([ |
3367 | /// ("extra" , "val" ), |
3368 | /// ("option" , "spec" ) |
3369 | /// ]) |
3370 | /// .action(ArgAction::Set) |
3371 | /// .long("config" )) |
3372 | /// .arg(Arg::new("extra" ) |
3373 | /// .action(ArgAction::Set) |
3374 | /// .long("extra" )) |
3375 | /// .arg(Arg::new("option" ) |
3376 | /// .action(ArgAction::Set) |
3377 | /// .long("option" )) |
3378 | /// .try_get_matches_from(vec![ |
3379 | /// "prog" , "--option" , "spec" |
3380 | /// ]); |
3381 | /// |
3382 | /// assert!(res.is_err()); |
3383 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
3384 | /// ``` |
3385 | /// [`Arg::requires(name)`]: Arg::requires() |
3386 | /// [Conflicting]: Arg::conflicts_with() |
3387 | /// [required]: Arg::required() |
3388 | #[must_use ] |
3389 | pub fn required_if_eq_any( |
3390 | mut self, |
3391 | ifs: impl IntoIterator<Item = (impl Into<Id>, impl Into<OsStr>)>, |
3392 | ) -> Self { |
3393 | self.r_ifs |
3394 | .extend(ifs.into_iter().map(|(id, val)| (id.into(), val.into()))); |
3395 | self |
3396 | } |
3397 | |
3398 | /// Specify this argument is [required] based on multiple conditions. |
3399 | /// |
3400 | /// The conditions are set up in a `(arg, val)` style tuple. The requirement will only become |
3401 | /// valid if every one of the specified `arg`'s value equals its corresponding `val`. |
3402 | /// |
3403 | /// # Examples |
3404 | /// |
3405 | /// ```rust |
3406 | /// # use clap_builder as clap; |
3407 | /// # use clap::Arg; |
3408 | /// Arg::new("config" ) |
3409 | /// .required_if_eq_all([ |
3410 | /// ("extra" , "val" ), |
3411 | /// ("option" , "spec" ) |
3412 | /// ]) |
3413 | /// # ; |
3414 | /// ``` |
3415 | /// |
3416 | /// Setting `Arg::required_if_eq_all([(arg, val)])` makes this arg required if all of the `arg`s |
3417 | /// are used at runtime and every value is equal to its corresponding `val`. If the `arg`'s value is |
3418 | /// anything other than `val`, this argument isn't required. |
3419 | /// |
3420 | /// ```rust |
3421 | /// # use clap_builder as clap; |
3422 | /// # use clap::{Command, Arg, ArgAction}; |
3423 | /// let res = Command::new("prog" ) |
3424 | /// .arg(Arg::new("cfg" ) |
3425 | /// .required_if_eq_all([ |
3426 | /// ("extra" , "val" ), |
3427 | /// ("option" , "spec" ) |
3428 | /// ]) |
3429 | /// .action(ArgAction::Set) |
3430 | /// .long("config" )) |
3431 | /// .arg(Arg::new("extra" ) |
3432 | /// .action(ArgAction::Set) |
3433 | /// .long("extra" )) |
3434 | /// .arg(Arg::new("option" ) |
3435 | /// .action(ArgAction::Set) |
3436 | /// .long("option" )) |
3437 | /// .try_get_matches_from(vec![ |
3438 | /// "prog" , "--option" , "spec" |
3439 | /// ]); |
3440 | /// |
3441 | /// assert!(res.is_ok()); // We didn't use --option=spec --extra=val so "cfg" isn't required |
3442 | /// ``` |
3443 | /// |
3444 | /// Setting `Arg::required_if_eq_all([(arg, val)])` and having all of the `arg`s used with its |
3445 | /// value of `val` but *not* using this arg is an error. |
3446 | /// |
3447 | /// ```rust |
3448 | /// # use clap_builder as clap; |
3449 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
3450 | /// let res = Command::new("prog" ) |
3451 | /// .arg(Arg::new("cfg" ) |
3452 | /// .required_if_eq_all([ |
3453 | /// ("extra" , "val" ), |
3454 | /// ("option" , "spec" ) |
3455 | /// ]) |
3456 | /// .action(ArgAction::Set) |
3457 | /// .long("config" )) |
3458 | /// .arg(Arg::new("extra" ) |
3459 | /// .action(ArgAction::Set) |
3460 | /// .long("extra" )) |
3461 | /// .arg(Arg::new("option" ) |
3462 | /// .action(ArgAction::Set) |
3463 | /// .long("option" )) |
3464 | /// .try_get_matches_from(vec![ |
3465 | /// "prog" , "--extra" , "val" , "--option" , "spec" |
3466 | /// ]); |
3467 | /// |
3468 | /// assert!(res.is_err()); |
3469 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
3470 | /// ``` |
3471 | /// [required]: Arg::required() |
3472 | #[must_use ] |
3473 | pub fn required_if_eq_all( |
3474 | mut self, |
3475 | ifs: impl IntoIterator<Item = (impl Into<Id>, impl Into<OsStr>)>, |
3476 | ) -> Self { |
3477 | self.r_ifs_all |
3478 | .extend(ifs.into_iter().map(|(id, val)| (id.into(), val.into()))); |
3479 | self |
3480 | } |
3481 | |
3482 | /// Require another argument if this arg matches the [`ArgPredicate`] |
3483 | /// |
3484 | /// This method takes `value, another_arg` pair. At runtime, clap will check |
3485 | /// if this arg (`self`) matches the [`ArgPredicate`]. |
3486 | /// If it does, `another_arg` will be marked as required. |
3487 | /// |
3488 | /// # Examples |
3489 | /// |
3490 | /// ```rust |
3491 | /// # use clap_builder as clap; |
3492 | /// # use clap::Arg; |
3493 | /// Arg::new("config" ) |
3494 | /// .requires_if("val" , "arg" ) |
3495 | /// # ; |
3496 | /// ``` |
3497 | /// |
3498 | /// Setting `Arg::requires_if(val, arg)` requires that the `arg` be used at runtime if the |
3499 | /// defining argument's value is equal to `val`. If the defining argument is anything other than |
3500 | /// `val`, the other argument isn't required. |
3501 | /// |
3502 | /// ```rust |
3503 | /// # use clap_builder as clap; |
3504 | /// # use clap::{Command, Arg, ArgAction}; |
3505 | /// let res = Command::new("prog" ) |
3506 | /// .arg(Arg::new("cfg" ) |
3507 | /// .action(ArgAction::Set) |
3508 | /// .requires_if("my.cfg" , "other" ) |
3509 | /// .long("config" )) |
3510 | /// .arg(Arg::new("other" )) |
3511 | /// .try_get_matches_from(vec![ |
3512 | /// "prog" , "--config" , "some.cfg" |
3513 | /// ]); |
3514 | /// |
3515 | /// assert!(res.is_ok()); // We didn't use --config=my.cfg, so other wasn't required |
3516 | /// ``` |
3517 | /// |
3518 | /// Setting `Arg::requires_if(val, arg)` and setting the value to `val` but *not* supplying |
3519 | /// `arg` is an error. |
3520 | /// |
3521 | /// ```rust |
3522 | /// # use clap_builder as clap; |
3523 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
3524 | /// let res = Command::new("prog" ) |
3525 | /// .arg(Arg::new("cfg" ) |
3526 | /// .action(ArgAction::Set) |
3527 | /// .requires_if("my.cfg" , "input" ) |
3528 | /// .long("config" )) |
3529 | /// .arg(Arg::new("input" )) |
3530 | /// .try_get_matches_from(vec![ |
3531 | /// "prog" , "--config" , "my.cfg" |
3532 | /// ]); |
3533 | /// |
3534 | /// assert!(res.is_err()); |
3535 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
3536 | /// ``` |
3537 | /// [`Arg::requires(name)`]: Arg::requires() |
3538 | /// [Conflicting]: Arg::conflicts_with() |
3539 | /// [override]: Arg::overrides_with() |
3540 | #[must_use ] |
3541 | pub fn requires_if(mut self, val: impl Into<ArgPredicate>, arg_id: impl Into<Id>) -> Self { |
3542 | self.requires.push((val.into(), arg_id.into())); |
3543 | self |
3544 | } |
3545 | |
3546 | /// Allows multiple conditional requirements. |
3547 | /// |
3548 | /// The requirement will only become valid if this arg's value matches the |
3549 | /// [`ArgPredicate`]. |
3550 | /// |
3551 | /// # Examples |
3552 | /// |
3553 | /// ```rust |
3554 | /// # use clap_builder as clap; |
3555 | /// # use clap::Arg; |
3556 | /// Arg::new("config" ) |
3557 | /// .requires_ifs([ |
3558 | /// ("val" , "arg" ), |
3559 | /// ("other_val" , "arg2" ), |
3560 | /// ]) |
3561 | /// # ; |
3562 | /// ``` |
3563 | /// |
3564 | /// Setting `Arg::requires_ifs(["val", "arg"])` requires that the `arg` be used at runtime if the |
3565 | /// defining argument's value is equal to `val`. If the defining argument's value is anything other |
3566 | /// than `val`, `arg` isn't required. |
3567 | /// |
3568 | /// ```rust |
3569 | /// # use clap_builder as clap; |
3570 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
3571 | /// let res = Command::new("prog" ) |
3572 | /// .arg(Arg::new("cfg" ) |
3573 | /// .action(ArgAction::Set) |
3574 | /// .requires_ifs([ |
3575 | /// ("special.conf" , "opt" ), |
3576 | /// ("other.conf" , "other" ), |
3577 | /// ]) |
3578 | /// .long("config" )) |
3579 | /// .arg(Arg::new("opt" ) |
3580 | /// .long("option" ) |
3581 | /// .action(ArgAction::Set)) |
3582 | /// .arg(Arg::new("other" )) |
3583 | /// .try_get_matches_from(vec![ |
3584 | /// "prog" , "--config" , "special.conf" |
3585 | /// ]); |
3586 | /// |
3587 | /// assert!(res.is_err()); // We used --config=special.conf so --option <val> is required |
3588 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
3589 | /// ``` |
3590 | /// |
3591 | /// Setting `Arg::requires_ifs` with [`ArgPredicate::IsPresent`] and *not* supplying all the |
3592 | /// arguments is an error. |
3593 | /// |
3594 | /// ```rust |
3595 | /// # use clap_builder as clap; |
3596 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction, builder::ArgPredicate}; |
3597 | /// let res = Command::new("prog" ) |
3598 | /// .arg(Arg::new("cfg" ) |
3599 | /// .action(ArgAction::Set) |
3600 | /// .requires_ifs([ |
3601 | /// (ArgPredicate::IsPresent, "input" ), |
3602 | /// (ArgPredicate::IsPresent, "output" ), |
3603 | /// ]) |
3604 | /// .long("config" )) |
3605 | /// .arg(Arg::new("input" )) |
3606 | /// .arg(Arg::new("output" )) |
3607 | /// .try_get_matches_from(vec![ |
3608 | /// "prog" , "--config" , "file.conf" , "in.txt" |
3609 | /// ]); |
3610 | /// |
3611 | /// assert!(res.is_err()); |
3612 | /// // We didn't use output |
3613 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument); |
3614 | /// ``` |
3615 | /// |
3616 | /// [`Arg::requires(name)`]: Arg::requires() |
3617 | /// [Conflicting]: Arg::conflicts_with() |
3618 | /// [override]: Arg::overrides_with() |
3619 | #[must_use ] |
3620 | pub fn requires_ifs( |
3621 | mut self, |
3622 | ifs: impl IntoIterator<Item = (impl Into<ArgPredicate>, impl Into<Id>)>, |
3623 | ) -> Self { |
3624 | self.requires |
3625 | .extend(ifs.into_iter().map(|(val, arg)| (val.into(), arg.into()))); |
3626 | self |
3627 | } |
3628 | |
3629 | #[doc (hidden)] |
3630 | #[cfg_attr ( |
3631 | feature = "deprecated" , |
3632 | deprecated(since = "4.0.0" , note = "Replaced with `Arg::requires_ifs`" ) |
3633 | )] |
3634 | pub fn requires_all(self, ids: impl IntoIterator<Item = impl Into<Id>>) -> Self { |
3635 | self.requires_ifs(ids.into_iter().map(|id| (ArgPredicate::IsPresent, id))) |
3636 | } |
3637 | |
3638 | /// This argument is mutually exclusive with the specified argument. |
3639 | /// |
3640 | /// **NOTE:** Conflicting rules take precedence over being required by default. Conflict rules |
3641 | /// only need to be set for one of the two arguments, they do not need to be set for each. |
3642 | /// |
3643 | /// **NOTE:** Defining a conflict is two-way, but does *not* need to defined for both arguments |
3644 | /// (i.e. if A conflicts with B, defining A.conflicts_with(B) is sufficient. You do not |
3645 | /// need to also do B.conflicts_with(A)) |
3646 | /// |
3647 | /// **NOTE:** [`Arg::conflicts_with_all(names)`] allows specifying an argument which conflicts with more than one argument. |
3648 | /// |
3649 | /// **NOTE** [`Arg::exclusive(true)`] allows specifying an argument which conflicts with every other argument. |
3650 | /// |
3651 | /// **NOTE:** All arguments implicitly conflict with themselves. |
3652 | /// |
3653 | /// # Examples |
3654 | /// |
3655 | /// ```rust |
3656 | /// # use clap_builder as clap; |
3657 | /// # use clap::Arg; |
3658 | /// Arg::new("config" ) |
3659 | /// .conflicts_with("debug" ) |
3660 | /// # ; |
3661 | /// ``` |
3662 | /// |
3663 | /// Setting conflicting argument, and having both arguments present at runtime is an error. |
3664 | /// |
3665 | /// ```rust |
3666 | /// # use clap_builder as clap; |
3667 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
3668 | /// let res = Command::new("prog" ) |
3669 | /// .arg(Arg::new("cfg" ) |
3670 | /// .action(ArgAction::Set) |
3671 | /// .conflicts_with("debug" ) |
3672 | /// .long("config" )) |
3673 | /// .arg(Arg::new("debug" ) |
3674 | /// .long("debug" ) |
3675 | /// .action(ArgAction::SetTrue)) |
3676 | /// .try_get_matches_from(vec![ |
3677 | /// "prog" , "--debug" , "--config" , "file.conf" |
3678 | /// ]); |
3679 | /// |
3680 | /// assert!(res.is_err()); |
3681 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::ArgumentConflict); |
3682 | /// ``` |
3683 | /// |
3684 | /// [`Arg::conflicts_with_all(names)`]: Arg::conflicts_with_all() |
3685 | /// [`Arg::exclusive(true)`]: Arg::exclusive() |
3686 | #[must_use ] |
3687 | pub fn conflicts_with(mut self, arg_id: impl IntoResettable<Id>) -> Self { |
3688 | if let Some(arg_id) = arg_id.into_resettable().into_option() { |
3689 | self.blacklist.push(arg_id); |
3690 | } else { |
3691 | self.blacklist.clear(); |
3692 | } |
3693 | self |
3694 | } |
3695 | |
3696 | /// This argument is mutually exclusive with the specified arguments. |
3697 | /// |
3698 | /// See [`Arg::conflicts_with`]. |
3699 | /// |
3700 | /// **NOTE:** Conflicting rules take precedence over being required by default. Conflict rules |
3701 | /// only need to be set for one of the two arguments, they do not need to be set for each. |
3702 | /// |
3703 | /// **NOTE:** Defining a conflict is two-way, but does *not* need to defined for both arguments |
3704 | /// (i.e. if A conflicts with B, defining A.conflicts_with(B) is sufficient. You do not need |
3705 | /// need to also do B.conflicts_with(A)) |
3706 | /// |
3707 | /// **NOTE:** [`Arg::exclusive(true)`] allows specifying an argument which conflicts with every other argument. |
3708 | /// |
3709 | /// # Examples |
3710 | /// |
3711 | /// ```rust |
3712 | /// # use clap_builder as clap; |
3713 | /// # use clap::Arg; |
3714 | /// Arg::new("config" ) |
3715 | /// .conflicts_with_all(["debug" , "input" ]) |
3716 | /// # ; |
3717 | /// ``` |
3718 | /// |
3719 | /// Setting conflicting argument, and having any of the arguments present at runtime with a |
3720 | /// conflicting argument is an error. |
3721 | /// |
3722 | /// ```rust |
3723 | /// # use clap_builder as clap; |
3724 | /// # use clap::{Command, Arg, error::ErrorKind, ArgAction}; |
3725 | /// let res = Command::new("prog" ) |
3726 | /// .arg(Arg::new("cfg" ) |
3727 | /// .action(ArgAction::Set) |
3728 | /// .conflicts_with_all(["debug" , "input" ]) |
3729 | /// .long("config" )) |
3730 | /// .arg(Arg::new("debug" ) |
3731 | /// .long("debug" )) |
3732 | /// .arg(Arg::new("input" )) |
3733 | /// .try_get_matches_from(vec![ |
3734 | /// "prog" , "--config" , "file.conf" , "file.txt" |
3735 | /// ]); |
3736 | /// |
3737 | /// assert!(res.is_err()); |
3738 | /// assert_eq!(res.unwrap_err().kind(), ErrorKind::ArgumentConflict); |
3739 | /// ``` |
3740 | /// [`Arg::conflicts_with`]: Arg::conflicts_with() |
3741 | /// [`Arg::exclusive(true)`]: Arg::exclusive() |
3742 | #[must_use ] |
3743 | pub fn conflicts_with_all(mut self, names: impl IntoIterator<Item = impl Into<Id>>) -> Self { |
3744 | self.blacklist.extend(names.into_iter().map(Into::into)); |
3745 | self |
3746 | } |
3747 | |
3748 | /// Sets an overridable argument. |
3749 | /// |
3750 | /// i.e. this argument and the following argument |
3751 | /// will override each other in POSIX style (whichever argument was specified at runtime |
3752 | /// **last** "wins") |
3753 | /// |
3754 | /// **NOTE:** When an argument is overridden it is essentially as if it never was used, any |
3755 | /// conflicts, requirements, etc. are evaluated **after** all "overrides" have been removed |
3756 | /// |
3757 | /// **NOTE:** Overriding an argument implies they [conflict][Arg::conflicts_with`]. |
3758 | /// |
3759 | /// # Examples |
3760 | /// |
3761 | /// ```rust |
3762 | /// # use clap_builder as clap; |
3763 | /// # use clap::{Command, arg}; |
3764 | /// let m = Command::new("prog" ) |
3765 | /// .arg(arg!(-f --flag "some flag" ) |
3766 | /// .conflicts_with("debug" )) |
3767 | /// .arg(arg!(-d --debug "other flag" )) |
3768 | /// .arg(arg!(-c --color "third flag" ) |
3769 | /// .overrides_with("flag" )) |
3770 | /// .get_matches_from(vec![ |
3771 | /// "prog" , "-f" , "-d" , "-c" ]); |
3772 | /// // ^~~~~~~~~~~~^~~~~ flag is overridden by color |
3773 | /// |
3774 | /// assert!(m.get_flag("color")); |
3775 | /// assert!(m.get_flag("debug")); // even though flag conflicts with debug, it's as if flag |
3776 | /// // was never used because it was overridden with color |
3777 | /// assert!(!m.get_flag("flag")); |
3778 | /// ``` |
3779 | #[must_use ] |
3780 | pub fn overrides_with(mut self, arg_id: impl IntoResettable<Id>) -> Self { |
3781 | if let Some(arg_id) = arg_id.into_resettable().into_option() { |
3782 | self.overrides.push(arg_id); |
3783 | } else { |
3784 | self.overrides.clear(); |
3785 | } |
3786 | self |
3787 | } |
3788 | |
3789 | /// Sets multiple mutually overridable arguments by name. |
3790 | /// |
3791 | /// i.e. this argument and the following argument will override each other in POSIX style |
3792 | /// (whichever argument was specified at runtime **last** "wins") |
3793 | /// |
3794 | /// **NOTE:** When an argument is overridden it is essentially as if it never was used, any |
3795 | /// conflicts, requirements, etc. are evaluated **after** all "overrides" have been removed |
3796 | /// |
3797 | /// **NOTE:** Overriding an argument implies they [conflict][Arg::conflicts_with_all`]. |
3798 | /// |
3799 | /// # Examples |
3800 | /// |
3801 | /// ```rust |
3802 | /// # use clap_builder as clap; |
3803 | /// # use clap::{Command, arg}; |
3804 | /// let m = Command::new("prog" ) |
3805 | /// .arg(arg!(-f --flag "some flag" ) |
3806 | /// .conflicts_with("color" )) |
3807 | /// .arg(arg!(-d --debug "other flag" )) |
3808 | /// .arg(arg!(-c --color "third flag" ) |
3809 | /// .overrides_with_all(["flag" , "debug" ])) |
3810 | /// .get_matches_from(vec![ |
3811 | /// "prog" , "-f" , "-d" , "-c" ]); |
3812 | /// // ^~~~~~^~~~~~~~~ flag and debug are overridden by color |
3813 | /// |
3814 | /// assert!(m.get_flag("color")); // even though flag conflicts with color, it's as if flag |
3815 | /// // and debug were never used because they were overridden |
3816 | /// // with color |
3817 | /// assert!(!m.get_flag("debug")); |
3818 | /// assert!(!m.get_flag("flag")); |
3819 | /// ``` |
3820 | #[must_use ] |
3821 | pub fn overrides_with_all(mut self, names: impl IntoIterator<Item = impl Into<Id>>) -> Self { |
3822 | self.overrides.extend(names.into_iter().map(Into::into)); |
3823 | self |
3824 | } |
3825 | } |
3826 | |
3827 | /// # Reflection |
3828 | impl Arg { |
3829 | /// Get the name of the argument |
3830 | #[inline ] |
3831 | pub fn get_id(&self) -> &Id { |
3832 | &self.id |
3833 | } |
3834 | |
3835 | /// Get the help specified for this argument, if any |
3836 | #[inline ] |
3837 | pub fn get_help(&self) -> Option<&StyledStr> { |
3838 | self.help.as_ref() |
3839 | } |
3840 | |
3841 | /// Get the long help specified for this argument, if any |
3842 | /// |
3843 | /// # Examples |
3844 | /// |
3845 | /// ```rust |
3846 | /// # use clap_builder as clap; |
3847 | /// # use clap::Arg; |
3848 | /// let arg = Arg::new("foo" ).long_help("long help" ); |
3849 | /// assert_eq!(Some("long help" .to_owned()), arg.get_long_help().map(|s| s.to_string())); |
3850 | /// ``` |
3851 | /// |
3852 | #[inline ] |
3853 | pub fn get_long_help(&self) -> Option<&StyledStr> { |
3854 | self.long_help.as_ref() |
3855 | } |
3856 | |
3857 | /// Get the help heading specified for this argument, if any |
3858 | #[inline ] |
3859 | pub fn get_help_heading(&self) -> Option<&str> { |
3860 | self.help_heading |
3861 | .as_ref() |
3862 | .map(|s| s.as_deref()) |
3863 | .unwrap_or_default() |
3864 | } |
3865 | |
3866 | /// Get the short option name for this argument, if any |
3867 | #[inline ] |
3868 | pub fn get_short(&self) -> Option<char> { |
3869 | self.short |
3870 | } |
3871 | |
3872 | /// Get visible short aliases for this argument, if any |
3873 | #[inline ] |
3874 | pub fn get_visible_short_aliases(&self) -> Option<Vec<char>> { |
3875 | if self.short_aliases.is_empty() { |
3876 | None |
3877 | } else { |
3878 | Some( |
3879 | self.short_aliases |
3880 | .iter() |
3881 | .filter_map(|(c, v)| if *v { Some(c) } else { None }) |
3882 | .copied() |
3883 | .collect(), |
3884 | ) |
3885 | } |
3886 | } |
3887 | |
3888 | /// Get *all* short aliases for this argument, if any, both visible and hidden. |
3889 | #[inline ] |
3890 | pub fn get_all_short_aliases(&self) -> Option<Vec<char>> { |
3891 | if self.short_aliases.is_empty() { |
3892 | None |
3893 | } else { |
3894 | Some(self.short_aliases.iter().map(|(s, _)| s).copied().collect()) |
3895 | } |
3896 | } |
3897 | |
3898 | /// Get the short option name and its visible aliases, if any |
3899 | #[inline ] |
3900 | pub fn get_short_and_visible_aliases(&self) -> Option<Vec<char>> { |
3901 | let mut shorts = match self.short { |
3902 | Some(short) => vec![short], |
3903 | None => return None, |
3904 | }; |
3905 | if let Some(aliases) = self.get_visible_short_aliases() { |
3906 | shorts.extend(aliases); |
3907 | } |
3908 | Some(shorts) |
3909 | } |
3910 | |
3911 | /// Get the long option name for this argument, if any |
3912 | #[inline ] |
3913 | pub fn get_long(&self) -> Option<&str> { |
3914 | self.long.as_deref() |
3915 | } |
3916 | |
3917 | /// Get visible aliases for this argument, if any |
3918 | #[inline ] |
3919 | pub fn get_visible_aliases(&self) -> Option<Vec<&str>> { |
3920 | if self.aliases.is_empty() { |
3921 | None |
3922 | } else { |
3923 | Some( |
3924 | self.aliases |
3925 | .iter() |
3926 | .filter_map(|(s, v)| if *v { Some(s.as_str()) } else { None }) |
3927 | .collect(), |
3928 | ) |
3929 | } |
3930 | } |
3931 | |
3932 | /// Get *all* aliases for this argument, if any, both visible and hidden. |
3933 | #[inline ] |
3934 | pub fn get_all_aliases(&self) -> Option<Vec<&str>> { |
3935 | if self.aliases.is_empty() { |
3936 | None |
3937 | } else { |
3938 | Some(self.aliases.iter().map(|(s, _)| s.as_str()).collect()) |
3939 | } |
3940 | } |
3941 | |
3942 | /// Get the long option name and its visible aliases, if any |
3943 | #[inline ] |
3944 | pub fn get_long_and_visible_aliases(&self) -> Option<Vec<&str>> { |
3945 | let mut longs = match self.get_long() { |
3946 | Some(long) => vec![long], |
3947 | None => return None, |
3948 | }; |
3949 | if let Some(aliases) = self.get_visible_aliases() { |
3950 | longs.extend(aliases); |
3951 | } |
3952 | Some(longs) |
3953 | } |
3954 | |
3955 | /// Get the names of possible values for this argument. Only useful for user |
3956 | /// facing applications, such as building help messages or man files |
3957 | pub fn get_possible_values(&self) -> Vec<PossibleValue> { |
3958 | if !self.is_takes_value_set() { |
3959 | vec![] |
3960 | } else { |
3961 | self.get_value_parser() |
3962 | .possible_values() |
3963 | .map(|pvs| pvs.collect()) |
3964 | .unwrap_or_default() |
3965 | } |
3966 | } |
3967 | |
3968 | /// Get the names of values for this argument. |
3969 | #[inline ] |
3970 | pub fn get_value_names(&self) -> Option<&[Str]> { |
3971 | if self.val_names.is_empty() { |
3972 | None |
3973 | } else { |
3974 | Some(&self.val_names) |
3975 | } |
3976 | } |
3977 | |
3978 | /// Get the number of values for this argument. |
3979 | #[inline ] |
3980 | pub fn get_num_args(&self) -> Option<ValueRange> { |
3981 | self.num_vals |
3982 | } |
3983 | |
3984 | #[inline ] |
3985 | pub(crate) fn get_min_vals(&self) -> usize { |
3986 | self.get_num_args().expect(INTERNAL_ERROR_MSG).min_values() |
3987 | } |
3988 | |
3989 | /// Get the delimiter between multiple values |
3990 | #[inline ] |
3991 | pub fn get_value_delimiter(&self) -> Option<char> { |
3992 | self.val_delim |
3993 | } |
3994 | |
3995 | /// Get the value terminator for this argument. The value_terminator is a value |
3996 | /// that terminates parsing of multi-valued arguments. |
3997 | #[inline ] |
3998 | pub fn get_value_terminator(&self) -> Option<&Str> { |
3999 | self.terminator.as_ref() |
4000 | } |
4001 | |
4002 | /// Get the index of this argument, if any |
4003 | #[inline ] |
4004 | pub fn get_index(&self) -> Option<usize> { |
4005 | self.index |
4006 | } |
4007 | |
4008 | /// Get the value hint of this argument |
4009 | pub fn get_value_hint(&self) -> ValueHint { |
4010 | self.value_hint.unwrap_or_else(|| { |
4011 | if self.is_takes_value_set() { |
4012 | let type_id = self.get_value_parser().type_id(); |
4013 | if type_id == AnyValueId::of::<std::path::PathBuf>() { |
4014 | ValueHint::AnyPath |
4015 | } else { |
4016 | ValueHint::default() |
4017 | } |
4018 | } else { |
4019 | ValueHint::default() |
4020 | } |
4021 | }) |
4022 | } |
4023 | |
4024 | /// Get the environment variable name specified for this argument, if any |
4025 | /// |
4026 | /// # Examples |
4027 | /// |
4028 | /// ```rust |
4029 | /// # use clap_builder as clap; |
4030 | /// # use std::ffi::OsStr; |
4031 | /// # use clap::Arg; |
4032 | /// let arg = Arg::new("foo").env("ENVIRONMENT"); |
4033 | /// assert_eq!(arg.get_env(), Some(OsStr::new("ENVIRONMENT"))); |
4034 | /// ``` |
4035 | #[cfg (feature = "env" )] |
4036 | pub fn get_env(&self) -> Option<&std::ffi::OsStr> { |
4037 | self.env.as_ref().map(|x| x.0.as_os_str()) |
4038 | } |
4039 | |
4040 | /// Get the default values specified for this argument, if any |
4041 | /// |
4042 | /// # Examples |
4043 | /// |
4044 | /// ```rust |
4045 | /// # use clap_builder as clap; |
4046 | /// # use clap::Arg; |
4047 | /// let arg = Arg::new("foo" ).default_value("default value" ); |
4048 | /// assert_eq!(arg.get_default_values(), &["default value" ]); |
4049 | /// ``` |
4050 | pub fn get_default_values(&self) -> &[OsStr] { |
4051 | &self.default_vals |
4052 | } |
4053 | |
4054 | /// Checks whether this argument is a positional or not. |
4055 | /// |
4056 | /// # Examples |
4057 | /// |
4058 | /// ```rust |
4059 | /// # use clap_builder as clap; |
4060 | /// # use clap::Arg; |
4061 | /// let arg = Arg::new("foo" ); |
4062 | /// assert_eq!(arg.is_positional(), true); |
4063 | /// |
4064 | /// let arg = Arg::new("foo" ).long("foo" ); |
4065 | /// assert_eq!(arg.is_positional(), false); |
4066 | /// ``` |
4067 | pub fn is_positional(&self) -> bool { |
4068 | self.get_long().is_none() && self.get_short().is_none() |
4069 | } |
4070 | |
4071 | /// Reports whether [`Arg::required`] is set |
4072 | pub fn is_required_set(&self) -> bool { |
4073 | self.is_set(ArgSettings::Required) |
4074 | } |
4075 | |
4076 | pub(crate) fn is_multiple_values_set(&self) -> bool { |
4077 | self.get_num_args().unwrap_or_default().is_multiple() |
4078 | } |
4079 | |
4080 | pub(crate) fn is_takes_value_set(&self) -> bool { |
4081 | self.get_action().takes_values() |
4082 | } |
4083 | |
4084 | /// Report whether [`Arg::allow_hyphen_values`] is set |
4085 | pub fn is_allow_hyphen_values_set(&self) -> bool { |
4086 | self.is_set(ArgSettings::AllowHyphenValues) |
4087 | } |
4088 | |
4089 | /// Report whether [`Arg::allow_negative_numbers`] is set |
4090 | pub fn is_allow_negative_numbers_set(&self) -> bool { |
4091 | self.is_set(ArgSettings::AllowNegativeNumbers) |
4092 | } |
4093 | |
4094 | /// Behavior when parsing the argument |
4095 | pub fn get_action(&self) -> &super::ArgAction { |
4096 | const DEFAULT: super::ArgAction = super::ArgAction::Set; |
4097 | self.action.as_ref().unwrap_or(&DEFAULT) |
4098 | } |
4099 | |
4100 | /// Configured parser for argument values |
4101 | /// |
4102 | /// # Example |
4103 | /// |
4104 | /// ```rust |
4105 | /// # use clap_builder as clap; |
4106 | /// let cmd = clap::Command::new("raw" ) |
4107 | /// .arg( |
4108 | /// clap::Arg::new("port" ) |
4109 | /// .value_parser(clap::value_parser!(usize)) |
4110 | /// ); |
4111 | /// let value_parser = cmd.get_arguments() |
4112 | /// .find(|a| a.get_id() == "port" ).unwrap() |
4113 | /// .get_value_parser(); |
4114 | /// println!("{value_parser:?}" ); |
4115 | /// ``` |
4116 | pub fn get_value_parser(&self) -> &super::ValueParser { |
4117 | if let Some(value_parser) = self.value_parser.as_ref() { |
4118 | value_parser |
4119 | } else { |
4120 | static DEFAULT: super::ValueParser = super::ValueParser::string(); |
4121 | &DEFAULT |
4122 | } |
4123 | } |
4124 | |
4125 | /// Report whether [`Arg::global`] is set |
4126 | pub fn is_global_set(&self) -> bool { |
4127 | self.is_set(ArgSettings::Global) |
4128 | } |
4129 | |
4130 | /// Report whether [`Arg::next_line_help`] is set |
4131 | pub fn is_next_line_help_set(&self) -> bool { |
4132 | self.is_set(ArgSettings::NextLineHelp) |
4133 | } |
4134 | |
4135 | /// Report whether [`Arg::hide`] is set |
4136 | pub fn is_hide_set(&self) -> bool { |
4137 | self.is_set(ArgSettings::Hidden) |
4138 | } |
4139 | |
4140 | /// Report whether [`Arg::hide_default_value`] is set |
4141 | pub fn is_hide_default_value_set(&self) -> bool { |
4142 | self.is_set(ArgSettings::HideDefaultValue) |
4143 | } |
4144 | |
4145 | /// Report whether [`Arg::hide_possible_values`] is set |
4146 | pub fn is_hide_possible_values_set(&self) -> bool { |
4147 | self.is_set(ArgSettings::HidePossibleValues) |
4148 | } |
4149 | |
4150 | /// Report whether [`Arg::hide_env`] is set |
4151 | #[cfg (feature = "env" )] |
4152 | pub fn is_hide_env_set(&self) -> bool { |
4153 | self.is_set(ArgSettings::HideEnv) |
4154 | } |
4155 | |
4156 | /// Report whether [`Arg::hide_env_values`] is set |
4157 | #[cfg (feature = "env" )] |
4158 | pub fn is_hide_env_values_set(&self) -> bool { |
4159 | self.is_set(ArgSettings::HideEnvValues) |
4160 | } |
4161 | |
4162 | /// Report whether [`Arg::hide_short_help`] is set |
4163 | pub fn is_hide_short_help_set(&self) -> bool { |
4164 | self.is_set(ArgSettings::HiddenShortHelp) |
4165 | } |
4166 | |
4167 | /// Report whether [`Arg::hide_long_help`] is set |
4168 | pub fn is_hide_long_help_set(&self) -> bool { |
4169 | self.is_set(ArgSettings::HiddenLongHelp) |
4170 | } |
4171 | |
4172 | /// Report whether [`Arg::require_equals`] is set |
4173 | pub fn is_require_equals_set(&self) -> bool { |
4174 | self.is_set(ArgSettings::RequireEquals) |
4175 | } |
4176 | |
4177 | /// Reports whether [`Arg::exclusive`] is set |
4178 | pub fn is_exclusive_set(&self) -> bool { |
4179 | self.is_set(ArgSettings::Exclusive) |
4180 | } |
4181 | |
4182 | /// Report whether [`Arg::trailing_var_arg`] is set |
4183 | pub fn is_trailing_var_arg_set(&self) -> bool { |
4184 | self.is_set(ArgSettings::TrailingVarArg) |
4185 | } |
4186 | |
4187 | /// Reports whether [`Arg::last`] is set |
4188 | pub fn is_last_set(&self) -> bool { |
4189 | self.is_set(ArgSettings::Last) |
4190 | } |
4191 | |
4192 | /// Reports whether [`Arg::ignore_case`] is set |
4193 | pub fn is_ignore_case_set(&self) -> bool { |
4194 | self.is_set(ArgSettings::IgnoreCase) |
4195 | } |
4196 | } |
4197 | |
4198 | /// # Internally used only |
4199 | impl Arg { |
4200 | pub(crate) fn _build(&mut self) { |
4201 | if self.action.is_none() { |
4202 | if self.num_vals == Some(ValueRange::EMPTY) { |
4203 | let action = super::ArgAction::SetTrue; |
4204 | self.action = Some(action); |
4205 | } else { |
4206 | let action = |
4207 | if self.is_positional() && self.num_vals.unwrap_or_default().is_unbounded() { |
4208 | // Allow collecting arguments interleaved with flags |
4209 | // |
4210 | // Bounded values are probably a group and the user should explicitly opt-in to |
4211 | // Append |
4212 | super::ArgAction::Append |
4213 | } else { |
4214 | super::ArgAction::Set |
4215 | }; |
4216 | self.action = Some(action); |
4217 | } |
4218 | } |
4219 | if let Some(action) = self.action.as_ref() { |
4220 | if let Some(default_value) = action.default_value() { |
4221 | if self.default_vals.is_empty() { |
4222 | self.default_vals = vec![default_value.into()]; |
4223 | } |
4224 | } |
4225 | if let Some(default_value) = action.default_missing_value() { |
4226 | if self.default_missing_vals.is_empty() { |
4227 | self.default_missing_vals = vec![default_value.into()]; |
4228 | } |
4229 | } |
4230 | } |
4231 | |
4232 | if self.value_parser.is_none() { |
4233 | if let Some(default) = self.action.as_ref().and_then(|a| a.default_value_parser()) { |
4234 | self.value_parser = Some(default); |
4235 | } else { |
4236 | self.value_parser = Some(super::ValueParser::string()); |
4237 | } |
4238 | } |
4239 | |
4240 | let val_names_len = self.val_names.len(); |
4241 | if val_names_len > 1 { |
4242 | self.num_vals.get_or_insert(val_names_len.into()); |
4243 | } else { |
4244 | let nargs = if self.get_action().takes_values() { |
4245 | ValueRange::SINGLE |
4246 | } else { |
4247 | ValueRange::EMPTY |
4248 | }; |
4249 | self.num_vals.get_or_insert(nargs); |
4250 | } |
4251 | } |
4252 | |
4253 | // Used for positionals when printing |
4254 | pub(crate) fn name_no_brackets(&self) -> String { |
4255 | debug!("Arg::name_no_brackets:{}" , self.get_id()); |
4256 | let delim = " " ; |
4257 | if !self.val_names.is_empty() { |
4258 | debug!("Arg::name_no_brackets: val_names={:#?}" , self.val_names); |
4259 | |
4260 | if self.val_names.len() > 1 { |
4261 | self.val_names |
4262 | .iter() |
4263 | .map(|n| format!("< {n}>" )) |
4264 | .collect::<Vec<_>>() |
4265 | .join(delim) |
4266 | } else { |
4267 | self.val_names |
4268 | .first() |
4269 | .expect(INTERNAL_ERROR_MSG) |
4270 | .as_str() |
4271 | .to_owned() |
4272 | } |
4273 | } else { |
4274 | debug!("Arg::name_no_brackets: just name" ); |
4275 | self.get_id().as_str().to_owned() |
4276 | } |
4277 | } |
4278 | |
4279 | pub(crate) fn stylized(&self, styles: &Styles, required: Option<bool>) -> StyledStr { |
4280 | use std::fmt::Write as _; |
4281 | let literal = styles.get_literal(); |
4282 | |
4283 | let mut styled = StyledStr::new(); |
4284 | // Write the name such --long or -l |
4285 | if let Some(l) = self.get_long() { |
4286 | let _ = write!( |
4287 | styled, |
4288 | " {}-- {l}{}" , |
4289 | literal.render(), |
4290 | literal.render_reset() |
4291 | ); |
4292 | } else if let Some(s) = self.get_short() { |
4293 | let _ = write!(styled, " {}- {s}{}" , literal.render(), literal.render_reset()); |
4294 | } |
4295 | styled.push_styled(&self.stylize_arg_suffix(styles, required)); |
4296 | styled |
4297 | } |
4298 | |
4299 | pub(crate) fn stylize_arg_suffix(&self, styles: &Styles, required: Option<bool>) -> StyledStr { |
4300 | use std::fmt::Write as _; |
4301 | let literal = styles.get_literal(); |
4302 | let placeholder = styles.get_placeholder(); |
4303 | let mut styled = StyledStr::new(); |
4304 | |
4305 | let mut need_closing_bracket = false; |
4306 | if self.is_takes_value_set() && !self.is_positional() { |
4307 | let is_optional_val = self.get_min_vals() == 0; |
4308 | let (style, start) = if self.is_require_equals_set() { |
4309 | if is_optional_val { |
4310 | need_closing_bracket = true; |
4311 | (placeholder, "[=" ) |
4312 | } else { |
4313 | (literal, "=" ) |
4314 | } |
4315 | } else if is_optional_val { |
4316 | need_closing_bracket = true; |
4317 | (placeholder, " [" ) |
4318 | } else { |
4319 | (placeholder, " " ) |
4320 | }; |
4321 | let _ = write!(styled, " {}{start}{}" , style.render(), style.render_reset()); |
4322 | } |
4323 | if self.is_takes_value_set() || self.is_positional() { |
4324 | let required = required.unwrap_or_else(|| self.is_required_set()); |
4325 | let arg_val = self.render_arg_val(required); |
4326 | let _ = write!( |
4327 | styled, |
4328 | " {}{arg_val}{}" , |
4329 | placeholder.render(), |
4330 | placeholder.render_reset() |
4331 | ); |
4332 | } else if matches!(*self.get_action(), ArgAction::Count) { |
4333 | let _ = write!( |
4334 | styled, |
4335 | " {}... {}" , |
4336 | placeholder.render(), |
4337 | placeholder.render_reset() |
4338 | ); |
4339 | } |
4340 | if need_closing_bracket { |
4341 | let _ = write!( |
4342 | styled, |
4343 | " {}] {}" , |
4344 | placeholder.render(), |
4345 | placeholder.render_reset() |
4346 | ); |
4347 | } |
4348 | |
4349 | styled |
4350 | } |
4351 | |
4352 | /// Write the values such as `<name1> <name2>` |
4353 | fn render_arg_val(&self, required: bool) -> String { |
4354 | let mut rendered = String::new(); |
4355 | |
4356 | let num_vals = self.get_num_args().unwrap_or_else(|| 1.into()); |
4357 | |
4358 | let mut val_names = if self.val_names.is_empty() { |
4359 | vec![self.id.as_internal_str().to_owned()] |
4360 | } else { |
4361 | self.val_names.clone() |
4362 | }; |
4363 | if val_names.len() == 1 { |
4364 | let min = num_vals.min_values().max(1); |
4365 | let val_name = val_names.pop().unwrap(); |
4366 | val_names = vec![val_name; min]; |
4367 | } |
4368 | |
4369 | debug_assert!(self.is_takes_value_set()); |
4370 | for (n, val_name) in val_names.iter().enumerate() { |
4371 | let arg_name = if self.is_positional() && (num_vals.min_values() == 0 || !required) { |
4372 | format!("[ {val_name}]" ) |
4373 | } else { |
4374 | format!("< {val_name}>" ) |
4375 | }; |
4376 | |
4377 | if n != 0 { |
4378 | rendered.push(' ' ); |
4379 | } |
4380 | rendered.push_str(&arg_name); |
4381 | } |
4382 | |
4383 | let mut extra_values = false; |
4384 | extra_values |= val_names.len() < num_vals.max_values(); |
4385 | if self.is_positional() && matches!(*self.get_action(), ArgAction::Append) { |
4386 | extra_values = true; |
4387 | } |
4388 | if extra_values { |
4389 | rendered.push_str("..." ); |
4390 | } |
4391 | |
4392 | rendered |
4393 | } |
4394 | |
4395 | /// Either multiple values or occurrences |
4396 | pub(crate) fn is_multiple(&self) -> bool { |
4397 | self.is_multiple_values_set() || matches!(*self.get_action(), ArgAction::Append) |
4398 | } |
4399 | |
4400 | #[cfg (feature = "help" )] |
4401 | pub(crate) fn get_display_order(&self) -> usize { |
4402 | self.disp_ord.unwrap_or(999) |
4403 | } |
4404 | } |
4405 | |
4406 | impl From<&'_ Arg> for Arg { |
4407 | fn from(a: &Arg) -> Self { |
4408 | a.clone() |
4409 | } |
4410 | } |
4411 | |
4412 | impl PartialEq for Arg { |
4413 | fn eq(&self, other: &Arg) -> bool { |
4414 | self.get_id() == other.get_id() |
4415 | } |
4416 | } |
4417 | |
4418 | impl PartialOrd for Arg { |
4419 | fn partial_cmp(&self, other: &Self) -> Option<Ordering> { |
4420 | Some(self.cmp(other)) |
4421 | } |
4422 | } |
4423 | |
4424 | impl Ord for Arg { |
4425 | fn cmp(&self, other: &Arg) -> Ordering { |
4426 | self.get_id().cmp(other.get_id()) |
4427 | } |
4428 | } |
4429 | |
4430 | impl Eq for Arg {} |
4431 | |
4432 | impl Display for Arg { |
4433 | fn fmt(&self, f: &mut Formatter) -> fmt::Result { |
4434 | let plain: Styles = Styles::plain(); |
4435 | self.stylized(&plain, required:None).fmt(f) |
4436 | } |
4437 | } |
4438 | |
4439 | impl fmt::Debug for Arg { |
4440 | fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> { |
4441 | let mut ds = f.debug_struct("Arg" ); |
4442 | |
4443 | #[allow (unused_mut)] |
4444 | let mut ds = ds |
4445 | .field("id" , &self.id) |
4446 | .field("help" , &self.help) |
4447 | .field("long_help" , &self.long_help) |
4448 | .field("action" , &self.action) |
4449 | .field("value_parser" , &self.value_parser) |
4450 | .field("blacklist" , &self.blacklist) |
4451 | .field("settings" , &self.settings) |
4452 | .field("overrides" , &self.overrides) |
4453 | .field("groups" , &self.groups) |
4454 | .field("requires" , &self.requires) |
4455 | .field("r_ifs" , &self.r_ifs) |
4456 | .field("r_unless" , &self.r_unless) |
4457 | .field("short" , &self.short) |
4458 | .field("long" , &self.long) |
4459 | .field("aliases" , &self.aliases) |
4460 | .field("short_aliases" , &self.short_aliases) |
4461 | .field("disp_ord" , &self.disp_ord) |
4462 | .field("val_names" , &self.val_names) |
4463 | .field("num_vals" , &self.num_vals) |
4464 | .field("val_delim" , &self.val_delim) |
4465 | .field("default_vals" , &self.default_vals) |
4466 | .field("default_vals_ifs" , &self.default_vals_ifs) |
4467 | .field("terminator" , &self.terminator) |
4468 | .field("index" , &self.index) |
4469 | .field("help_heading" , &self.help_heading) |
4470 | .field("value_hint" , &self.value_hint) |
4471 | .field("default_missing_vals" , &self.default_missing_vals); |
4472 | |
4473 | #[cfg (feature = "env" )] |
4474 | { |
4475 | ds = ds.field("env" , &self.env); |
4476 | } |
4477 | |
4478 | ds.finish() |
4479 | } |
4480 | } |
4481 | |
4482 | // Flags |
4483 | #[cfg (test)] |
4484 | mod test { |
4485 | use super::Arg; |
4486 | use super::ArgAction; |
4487 | |
4488 | #[test ] |
4489 | fn flag_display_long() { |
4490 | let mut f = Arg::new("flg" ).long("flag" ).action(ArgAction::SetTrue); |
4491 | f._build(); |
4492 | |
4493 | assert_eq!(f.to_string(), "--flag" ); |
4494 | } |
4495 | |
4496 | #[test ] |
4497 | fn flag_display_short() { |
4498 | let mut f2 = Arg::new("flg" ).short('f' ).action(ArgAction::SetTrue); |
4499 | f2._build(); |
4500 | |
4501 | assert_eq!(f2.to_string(), "-f" ); |
4502 | } |
4503 | |
4504 | #[test ] |
4505 | fn flag_display_count() { |
4506 | let mut f2 = Arg::new("flg" ).long("flag" ).action(ArgAction::Count); |
4507 | f2._build(); |
4508 | |
4509 | assert_eq!(f2.to_string(), "--flag..." ); |
4510 | } |
4511 | |
4512 | #[test ] |
4513 | fn flag_display_single_alias() { |
4514 | let mut f = Arg::new("flg" ) |
4515 | .long("flag" ) |
4516 | .visible_alias("als" ) |
4517 | .action(ArgAction::SetTrue); |
4518 | f._build(); |
4519 | |
4520 | assert_eq!(f.to_string(), "--flag" ) |
4521 | } |
4522 | |
4523 | #[test ] |
4524 | fn flag_display_multiple_aliases() { |
4525 | let mut f = Arg::new("flg" ).short('f' ).action(ArgAction::SetTrue); |
4526 | f.aliases = vec![ |
4527 | ("alias_not_visible" .into(), false), |
4528 | ("f2" .into(), true), |
4529 | ("f3" .into(), true), |
4530 | ("f4" .into(), true), |
4531 | ]; |
4532 | f._build(); |
4533 | |
4534 | assert_eq!(f.to_string(), "-f" ); |
4535 | } |
4536 | |
4537 | #[test ] |
4538 | fn flag_display_single_short_alias() { |
4539 | let mut f = Arg::new("flg" ).short('a' ).action(ArgAction::SetTrue); |
4540 | f.short_aliases = vec![('b' , true)]; |
4541 | f._build(); |
4542 | |
4543 | assert_eq!(f.to_string(), "-a" ) |
4544 | } |
4545 | |
4546 | #[test ] |
4547 | fn flag_display_multiple_short_aliases() { |
4548 | let mut f = Arg::new("flg" ).short('a' ).action(ArgAction::SetTrue); |
4549 | f.short_aliases = vec![('b' , false), ('c' , true), ('d' , true), ('e' , true)]; |
4550 | f._build(); |
4551 | |
4552 | assert_eq!(f.to_string(), "-a" ); |
4553 | } |
4554 | |
4555 | // Options |
4556 | |
4557 | #[test ] |
4558 | fn option_display_multiple_occurrences() { |
4559 | let mut o = Arg::new("opt" ).long("option" ).action(ArgAction::Append); |
4560 | o._build(); |
4561 | |
4562 | assert_eq!(o.to_string(), "--option <opt>" ); |
4563 | } |
4564 | |
4565 | #[test ] |
4566 | fn option_display_multiple_values() { |
4567 | let mut o = Arg::new("opt" ) |
4568 | .long("option" ) |
4569 | .action(ArgAction::Set) |
4570 | .num_args(1..); |
4571 | o._build(); |
4572 | |
4573 | assert_eq!(o.to_string(), "--option <opt>..." ); |
4574 | } |
4575 | |
4576 | #[test ] |
4577 | fn option_display_zero_or_more_values() { |
4578 | let mut o = Arg::new("opt" ) |
4579 | .long("option" ) |
4580 | .action(ArgAction::Set) |
4581 | .num_args(0..); |
4582 | o._build(); |
4583 | |
4584 | assert_eq!(o.to_string(), "--option [<opt>...]" ); |
4585 | } |
4586 | |
4587 | #[test ] |
4588 | fn option_display_one_or_more_values() { |
4589 | let mut o = Arg::new("opt" ) |
4590 | .long("option" ) |
4591 | .action(ArgAction::Set) |
4592 | .num_args(1..); |
4593 | o._build(); |
4594 | |
4595 | assert_eq!(o.to_string(), "--option <opt>..." ); |
4596 | } |
4597 | |
4598 | #[test ] |
4599 | fn option_display_zero_or_more_values_with_value_name() { |
4600 | let mut o = Arg::new("opt" ) |
4601 | .short('o' ) |
4602 | .action(ArgAction::Set) |
4603 | .num_args(0..) |
4604 | .value_names(["file" ]); |
4605 | o._build(); |
4606 | |
4607 | assert_eq!(o.to_string(), "-o [<file>...]" ); |
4608 | } |
4609 | |
4610 | #[test ] |
4611 | fn option_display_one_or_more_values_with_value_name() { |
4612 | let mut o = Arg::new("opt" ) |
4613 | .short('o' ) |
4614 | .action(ArgAction::Set) |
4615 | .num_args(1..) |
4616 | .value_names(["file" ]); |
4617 | o._build(); |
4618 | |
4619 | assert_eq!(o.to_string(), "-o <file>..." ); |
4620 | } |
4621 | |
4622 | #[test ] |
4623 | fn option_display_optional_value() { |
4624 | let mut o = Arg::new("opt" ) |
4625 | .long("option" ) |
4626 | .action(ArgAction::Set) |
4627 | .num_args(0..=1); |
4628 | o._build(); |
4629 | |
4630 | assert_eq!(o.to_string(), "--option [<opt>]" ); |
4631 | } |
4632 | |
4633 | #[test ] |
4634 | fn option_display_value_names() { |
4635 | let mut o = Arg::new("opt" ) |
4636 | .short('o' ) |
4637 | .action(ArgAction::Set) |
4638 | .value_names(["file" , "name" ]); |
4639 | o._build(); |
4640 | |
4641 | assert_eq!(o.to_string(), "-o <file> <name>" ); |
4642 | } |
4643 | |
4644 | #[test ] |
4645 | fn option_display3() { |
4646 | let mut o = Arg::new("opt" ) |
4647 | .short('o' ) |
4648 | .num_args(1..) |
4649 | .action(ArgAction::Set) |
4650 | .value_names(["file" , "name" ]); |
4651 | o._build(); |
4652 | |
4653 | assert_eq!(o.to_string(), "-o <file> <name>..." ); |
4654 | } |
4655 | |
4656 | #[test ] |
4657 | fn option_display_single_alias() { |
4658 | let mut o = Arg::new("opt" ) |
4659 | .long("option" ) |
4660 | .action(ArgAction::Set) |
4661 | .visible_alias("als" ); |
4662 | o._build(); |
4663 | |
4664 | assert_eq!(o.to_string(), "--option <opt>" ); |
4665 | } |
4666 | |
4667 | #[test ] |
4668 | fn option_display_multiple_aliases() { |
4669 | let mut o = Arg::new("opt" ) |
4670 | .long("option" ) |
4671 | .action(ArgAction::Set) |
4672 | .visible_aliases(["als2" , "als3" , "als4" ]) |
4673 | .alias("als_not_visible" ); |
4674 | o._build(); |
4675 | |
4676 | assert_eq!(o.to_string(), "--option <opt>" ); |
4677 | } |
4678 | |
4679 | #[test ] |
4680 | fn option_display_single_short_alias() { |
4681 | let mut o = Arg::new("opt" ) |
4682 | .short('a' ) |
4683 | .action(ArgAction::Set) |
4684 | .visible_short_alias('b' ); |
4685 | o._build(); |
4686 | |
4687 | assert_eq!(o.to_string(), "-a <opt>" ); |
4688 | } |
4689 | |
4690 | #[test ] |
4691 | fn option_display_multiple_short_aliases() { |
4692 | let mut o = Arg::new("opt" ) |
4693 | .short('a' ) |
4694 | .action(ArgAction::Set) |
4695 | .visible_short_aliases(['b' , 'c' , 'd' ]) |
4696 | .short_alias('e' ); |
4697 | o._build(); |
4698 | |
4699 | assert_eq!(o.to_string(), "-a <opt>" ); |
4700 | } |
4701 | |
4702 | // Positionals |
4703 | |
4704 | #[test ] |
4705 | fn positional_display_multiple_values() { |
4706 | let mut p = Arg::new("pos" ).index(1).num_args(1..); |
4707 | p._build(); |
4708 | |
4709 | assert_eq!(p.to_string(), "[pos]..." ); |
4710 | } |
4711 | |
4712 | #[test ] |
4713 | fn positional_display_multiple_values_required() { |
4714 | let mut p = Arg::new("pos" ).index(1).num_args(1..).required(true); |
4715 | p._build(); |
4716 | |
4717 | assert_eq!(p.to_string(), "<pos>..." ); |
4718 | } |
4719 | |
4720 | #[test ] |
4721 | fn positional_display_zero_or_more_values() { |
4722 | let mut p = Arg::new("pos" ).index(1).num_args(0..); |
4723 | p._build(); |
4724 | |
4725 | assert_eq!(p.to_string(), "[pos]..." ); |
4726 | } |
4727 | |
4728 | #[test ] |
4729 | fn positional_display_one_or_more_values() { |
4730 | let mut p = Arg::new("pos" ).index(1).num_args(1..); |
4731 | p._build(); |
4732 | |
4733 | assert_eq!(p.to_string(), "[pos]..." ); |
4734 | } |
4735 | |
4736 | #[test ] |
4737 | fn positional_display_one_or_more_values_required() { |
4738 | let mut p = Arg::new("pos" ).index(1).num_args(1..).required(true); |
4739 | p._build(); |
4740 | |
4741 | assert_eq!(p.to_string(), "<pos>..." ); |
4742 | } |
4743 | |
4744 | #[test ] |
4745 | fn positional_display_optional_value() { |
4746 | let mut p = Arg::new("pos" ) |
4747 | .index(1) |
4748 | .num_args(0..=1) |
4749 | .action(ArgAction::Set); |
4750 | p._build(); |
4751 | |
4752 | assert_eq!(p.to_string(), "[pos]" ); |
4753 | } |
4754 | |
4755 | #[test ] |
4756 | fn positional_display_multiple_occurrences() { |
4757 | let mut p = Arg::new("pos" ).index(1).action(ArgAction::Append); |
4758 | p._build(); |
4759 | |
4760 | assert_eq!(p.to_string(), "[pos]..." ); |
4761 | } |
4762 | |
4763 | #[test ] |
4764 | fn positional_display_multiple_occurrences_required() { |
4765 | let mut p = Arg::new("pos" ) |
4766 | .index(1) |
4767 | .action(ArgAction::Append) |
4768 | .required(true); |
4769 | p._build(); |
4770 | |
4771 | assert_eq!(p.to_string(), "<pos>..." ); |
4772 | } |
4773 | |
4774 | #[test ] |
4775 | fn positional_display_required() { |
4776 | let mut p = Arg::new("pos" ).index(1).required(true); |
4777 | p._build(); |
4778 | |
4779 | assert_eq!(p.to_string(), "<pos>" ); |
4780 | } |
4781 | |
4782 | #[test ] |
4783 | fn positional_display_val_names() { |
4784 | let mut p = Arg::new("pos" ).index(1).value_names(["file1" , "file2" ]); |
4785 | p._build(); |
4786 | |
4787 | assert_eq!(p.to_string(), "[file1] [file2]" ); |
4788 | } |
4789 | |
4790 | #[test ] |
4791 | fn positional_display_val_names_required() { |
4792 | let mut p = Arg::new("pos" ) |
4793 | .index(1) |
4794 | .value_names(["file1" , "file2" ]) |
4795 | .required(true); |
4796 | p._build(); |
4797 | |
4798 | assert_eq!(p.to_string(), "<file1> <file2>" ); |
4799 | } |
4800 | } |
4801 | |