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diff: Allow configurable context for unified and context diffs

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Add the options '-C','--context' and '-U','--unified', which can be used
to ask diff to write a diff in that format with a given number of
context lines surrounding the diff.
This commit is contained in:
Shannon Booth 2023-07-05 18:36:03 +12:00 committed by Sam Atkins
parent 876ad69ea3
commit c57658fffa
Notes: sideshowbarker 2024-07-17 02:35:27 +09:00 
Author: https://github.com/shannonbooth
Commit: https://github.com/SerenityOS/serenity/commit/c57658fffa
Pull-request: https://github.com/SerenityOS/serenity/pull/19804
Reviewed-by: https://github.com/AtkinsSJ ✅
1 changed files with 19 additions and 1 deletions
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20
Userland/Utilities/diff.cpp
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@ -21,6 +21,10 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
bool unified = false;
bool context = false;
Optional<size_t> unified_format_context;
Optional<size_t> context_format_context;
StringView filename1;
StringView filename2;
@ -28,6 +32,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
parser.add_positional_argument(filename2, "Second file to compare", "file2", Core::ArgsParser::Required::Yes);
parser.add_option(unified, "Write diff in unified format", nullptr, 'u');
parser.add_option(context, "Write diff in context format", nullptr, 'c');
parser.add_option(unified_format_context, "Write diff in unified format with the given number of context lines", "unified", 'U', "lines");
parser.add_option(context_format_context, "Write diff in context format with the given number of context lines", "context", 'C', "lines");
parser.parse(arguments);
auto file1 = TRY(Core::File::open(filename1, Core::File::OpenMode::Read));
@ -36,7 +42,19 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
auto const color_output = TRY(Core::System::isatty(STDOUT_FILENO)) ? Diff::ColorOutput::Yes : Diff::ColorOutput::No;
size_t number_context_lines = unified || context ? 3 : 0;
size_t number_context_lines = 0;
if (unified_format_context.has_value()) {
number_context_lines = *unified_format_context;
unified = true;
} else if (context_format_context.has_value()) {
number_context_lines = *context_format_context;
context = true;
} else if (context || unified) {
// Default for these formats is 3, but 0 in normal format.
number_context_lines = 3;
}
auto hunks = TRY(Diff::from_text(TRY(file1->read_until_eof()), TRY(file2->read_until_eof()), number_context_lines));
if (unified) {