1//===-- ClangApplyReplacementsMain.cpp - Main file for the tool -----------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// This file provides the main function for the
11/// clang-apply-replacements tool.
12///
13//===----------------------------------------------------------------------===//
14
15#include "clang-apply-replacements/Tooling/ApplyReplacements.h"
16#include "clang/Basic/Diagnostic.h"
17#include "clang/Basic/DiagnosticOptions.h"
18#include "clang/Basic/SourceManager.h"
19#include "clang/Basic/Version.h"
20#include "clang/Format/Format.h"
21#include "clang/Rewrite/Core/Rewriter.h"
22#include "llvm/ADT/STLExtras.h"
23#include "llvm/ADT/StringSet.h"
24#include "llvm/Support/CommandLine.h"
25
26using namespace llvm;
27using namespace clang;
28using namespace clang::replace;
29
30static cl::opt<std::string> Directory(cl::Positional, cl::Required,
31 cl::desc("<Search Root Directory>"));
32
33static cl::OptionCategory ReplacementCategory("Replacement Options");
34static cl::OptionCategory FormattingCategory("Formatting Options");
35
36const cl::OptionCategory *VisibleCategories[] = {&ReplacementCategory,
37 &FormattingCategory};
38
39static cl::opt<bool> RemoveTUReplacementFiles(
40 "remove-change-desc-files",
41 cl::desc("Remove the change description files regardless of successful\n"
42 "merging/replacing."),
43 cl::init(Val: false), cl::cat(ReplacementCategory));
44
45static cl::opt<bool> IgnoreInsertConflict(
46 "ignore-insert-conflict",
47 cl::desc("Ignore insert conflict and keep running to fix."),
48 cl::init(Val: false), cl::cat(ReplacementCategory));
49
50static cl::opt<bool> DoFormat(
51 "format",
52 cl::desc("Enable formatting of code changed by applying replacements.\n"
53 "Use -style to choose formatting style.\n"),
54 cl::cat(FormattingCategory));
55
56// FIXME: Consider making the default behaviour for finding a style
57// configuration file to start the search anew for every file being changed to
58// handle situations where the style is different for different parts of a
59// project.
60
61static cl::opt<std::string> FormatStyleConfig(
62 "style-config",
63 cl::desc("Path to a directory containing a .clang-format file\n"
64 "describing a formatting style to use for formatting\n"
65 "code when -style=file.\n"),
66 cl::init(Val: ""), cl::cat(FormattingCategory));
67
68static cl::opt<std::string>
69 FormatStyleOpt("style", cl::desc(format::StyleOptionHelpDescription),
70 cl::init(Val: "LLVM"), cl::cat(FormattingCategory));
71
72namespace {
73// Helper object to remove the TUReplacement and TUDiagnostic (triggered by
74// "remove-change-desc-files" command line option) when exiting current scope.
75class ScopedFileRemover {
76public:
77 ScopedFileRemover(const TUReplacementFiles &Files,
78 clang::DiagnosticsEngine &Diagnostics)
79 : TURFiles(Files), Diag(Diagnostics) {}
80
81 ~ScopedFileRemover() { deleteReplacementFiles(Files: TURFiles, Diagnostics&: Diag); }
82
83private:
84 const TUReplacementFiles &TURFiles;
85 clang::DiagnosticsEngine &Diag;
86};
87} // namespace
88
89static void printVersion(raw_ostream &OS) {
90 OS << "clang-apply-replacements version " CLANG_VERSION_STRING << "\n";
91}
92
93int main(int argc, char **argv) {
94 cl::HideUnrelatedOptions(Categories: ArrayRef(VisibleCategories));
95
96 cl::SetVersionPrinter(printVersion);
97 cl::ParseCommandLineOptions(argc, argv);
98
99 DiagnosticOptions DiagOpts;
100 DiagnosticsEngine Diagnostics(
101 IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs()), DiagOpts);
102
103 // Determine a formatting style from options.
104 auto FormatStyleOrError = format::getStyle(StyleName: FormatStyleOpt, FileName: FormatStyleConfig,
105 FallbackStyle: format::DefaultFallbackStyle);
106 if (!FormatStyleOrError) {
107 llvm::errs() << llvm::toString(E: FormatStyleOrError.takeError()) << "\n";
108 return 1;
109 }
110 format::FormatStyle FormatStyle = std::move(*FormatStyleOrError);
111
112 TUReplacements TURs;
113 TUReplacementFiles TUFiles;
114
115 std::error_code ErrorCode =
116 collectReplacementsFromDirectory(Directory, TUs&: TURs, TUFiles, Diagnostics);
117
118 TUDiagnostics TUDs;
119 TUFiles.clear();
120 ErrorCode =
121 collectReplacementsFromDirectory(Directory, TUs&: TUDs, TUFiles, Diagnostics);
122
123 if (ErrorCode) {
124 errs() << "Trouble iterating over directory '" << Directory
125 << "': " << ErrorCode.message() << "\n";
126 return 1;
127 }
128
129 // Remove the TUReplacementFiles (triggered by "remove-change-desc-files"
130 // command line option) when exiting main().
131 std::unique_ptr<ScopedFileRemover> Remover;
132 if (RemoveTUReplacementFiles)
133 Remover.reset(p: new ScopedFileRemover(TUFiles, Diagnostics));
134
135 FileManager Files((FileSystemOptions()));
136 SourceManager SM(Diagnostics, Files);
137
138 FileToChangesMap Changes;
139 if (!mergeAndDeduplicate(TUs: TURs, TUDs, FileChanges&: Changes, SM, IgnoreInsertConflict))
140 return 1;
141
142 tooling::ApplyChangesSpec Spec;
143 Spec.Cleanup = true;
144 Spec.Format = DoFormat ? tooling::ApplyChangesSpec::kAll
145 : tooling::ApplyChangesSpec::kNone;
146 Spec.Style = DoFormat ? FormatStyle : format::getNoStyle();
147
148 for (const auto &FileChange : Changes) {
149 FileEntryRef Entry = FileChange.first;
150 StringRef FileName = Entry.getName();
151 llvm::Expected<std::string> NewFileData =
152 applyChanges(File: FileName, Changes: FileChange.second, Spec, Diagnostics);
153 if (!NewFileData) {
154 errs() << llvm::toString(E: NewFileData.takeError()) << "\n";
155 continue;
156 }
157
158 // Write new file to disk
159 std::error_code EC;
160 llvm::raw_fd_ostream FileStream(FileName, EC, llvm::sys::fs::OF_None);
161 if (EC) {
162 llvm::errs() << "Could not open " << FileName << " for writing\n";
163 continue;
164 }
165 FileStream << *NewFileData;
166 }
167
168 return 0;
169}
170

source code of clang-tools-extra/clang-apply-replacements/tool/ClangApplyReplacementsMain.cpp