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https://github.com/SerenityOS/serenity
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patch: Support creation of a file
Previously patch would always expect the file that it was patching to exist (even it were empty). If we know that the patch is creating a file from nothing (i.e has a start line of '0'), then we treat a file that doesn't exist as if it has no content lines.
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@ -149,3 +149,19 @@ TEST_CASE(strip_path_partially)
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EXPECT_FILE_EQ(MUST(String::formatted("{}/to/basename", s_test_dir)), "Hello, friends!\n");
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}
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TEST_CASE(add_file_from_scratch)
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{
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PatchSetup setup;
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auto patch = R"(
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--- /dev/null
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+++ a/file_to_add
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@@ -0,0 +1 @@
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+Hello, friends!
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)"sv;
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run_patch({}, patch, "patching file file_to_add\n"sv);
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EXPECT_FILE_EQ(MUST(String::formatted("{}/file_to_add", s_test_dir)), "Hello, friends!\n");
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}
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@ -12,10 +12,31 @@
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#include <LibFileSystem/FileSystem.h>
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#include <LibMain/Main.h>
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static bool is_adding_file(Diff::Patch const& patch)
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{
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return patch.hunks[0].location.old_range.start_line == 0;
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}
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static ErrorOr<ByteBuffer> read_content(StringView path_of_file_to_patch, Diff::Patch const& patch)
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{
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auto file_to_patch_or_error = Core::File::open(path_of_file_to_patch, Core::File::OpenMode::Read);
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// Trivial case - no error reading the file.
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if (!file_to_patch_or_error.is_error())
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return TRY(file_to_patch_or_error.release_value()->read_until_eof());
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auto const& error = file_to_patch_or_error.error();
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// If the patch is adding a file then it is fine for opening the file to error out if it did not exist.
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if (!is_adding_file(patch) || !error.is_errno() || error.code() != ENOENT)
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return file_to_patch_or_error.release_error();
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return ByteBuffer {};
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}
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static ErrorOr<void> do_patch(StringView path_of_file_to_patch, Diff::Patch const& patch)
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{
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auto file_to_patch = TRY(Core::File::open(path_of_file_to_patch, Core::File::OpenMode::Read));
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auto content = TRY(file_to_patch->read_until_eof());
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ByteBuffer content = TRY(read_content(path_of_file_to_patch, patch));
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auto lines = StringView(content).lines();
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// Apply patch to a temporary file in case one or more of the hunks fails.
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@ -54,7 +75,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
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StringView to_patch;
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if (FileSystem::is_regular_file(patch.header.old_file_path)) {
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to_patch = patch.header.old_file_path;
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} else if (FileSystem::is_regular_file(patch.header.new_file_path)) {
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} else if (is_adding_file(patch) || FileSystem::is_regular_file(patch.header.new_file_path)) {
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to_patch = patch.header.new_file_path;
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} else {
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warnln("Unable to determine file to patch");
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