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LibDiff+patch: Support multiple patches in a single patch file

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Multiple patches may be concatenated in the same patch file, such as git
commits which are changing multiple files at the same time. To handle
this, parse each patch in order in the patch file, and apply each patch
sequentially.

To determine whether we are at the end of a patch (and not just parsing
another hunk) the parser will look for a leading '@@ ' after every hunk.
If that is found, there is another hunk. Otherwise, we must be at the
end of this patch.
This commit is contained in:
Shannon Booth 2023-07-12 10:37:26 +12:00 • committed by Sam Atkins
parent ddbd77cca1
commit dd373eacbc
4 changed files with 57 additions and 20 deletions
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4
Userland/Libraries/LibDiff/Hunks.h
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@ -80,11 +80,13 @@ class Parser : public GenericLexer {
public:
using GenericLexer::GenericLexer;
ErrorOr<Patch> parse_patch(Optional<size_t> const& strip_count = {});
ErrorOr<Vector<Hunk>> parse_hunks();
private:
ErrorOr<Header> parse_header(Optional<size_t> const& strip_count);
private:
ErrorOr<String> parse_file_line(Optional<size_t> const& strip_count);
Optional<HunkLocation> consume_unified_location();
bool consume_line_number(size_t& number);