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b6d8f309d9
This changes the diff-raw format again, following the mailing list discussion. The new format explicitly expresses which one is a rename and which one is a copy. The documentation and tests are updated to match this change. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
101 lines
3.5 KiB
Plaintext
101 lines
3.5 KiB
Plaintext
The output format from "git-diff-cache", "git-diff-tree" and
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"git-diff-files" is very similar.
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These commands all compare two sets of things; what are
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compared are different:
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git-diff-cache <tree-ish>::
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compares the <tree-ish> and the files on the filesystem.
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git-diff-cache --cached <tree-ish>::
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compares the <tree-ish> and the cache.
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git-diff-tree [-r] <tree-ish-1> <tree-ish-2> [<pattern>...]::
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compares the trees named by the two arguments.
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git-diff-files [<pattern>...]::
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compares the cache and the files on the filesystem.
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An output line is formatted this way:
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in-place edit :100644 100644 bcd1234... 0123456... M file0
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copy-edit :100644 100644 abcd123... 1234567... C68 file1 file2
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rename-edit :100644 100644 abcd123... 1234567... R86 file1 file3
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create :000000 100644 0000000... 1234567... N file4
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delete :100644 000000 1234567... 0000000... D file5
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unmerged :000000 000000 0000000... 0000000... U file6
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That is, from the left to the right:
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(1) a colon.
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(2) mode for "src"; 000000 if creation or unmerged.
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(3) a space.
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(4) mode for "dst"; 000000 if deletion or unmerged.
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(5) a space.
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(6) sha1 for "src"; 0{40} if creation or unmerged.
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(7) a space.
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(8) sha1 for "dst"; 0{40} if creation, unmerged or "look at work tree".
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(9) status, followed by similarlity index number only for C and R.
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(10) a tab or a NUL when '-z' option is used.
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(11) path for "src"
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(12) a tab or a NUL when '-z' option is used; only exists for C or R.
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(13) path for "dst"; only exists for C or R.
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(14) an LF or a NUL when '-z' option is used, to terminate the record.
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<sha1> is shown as all 0's if new is a file on the filesystem
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and it is out of sync with the cache. Example:
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:100644 100644 5be4a4...... 000000...... M file.c
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Generating patches with -p
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--------------------------
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When "git-diff-cache", "git-diff-tree", or "git-diff-files" are run
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with a '-p' option, they do not produce the output described above
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instead they produce a patch file.
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The patch generation can be customized at two levels. This
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customization also applies to "git-diff-helper".
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1. When the environment variable 'GIT_EXTERNAL_DIFF' is not set,
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these commands internally invoke "diff" like this:
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diff -L a/<path> -L a/<path> -pu <old> <new>
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+
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For added files, `/dev/null` is used for <old>. For removed
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files, `/dev/null` is used for <new>
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+
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The "diff" formatting options can be customized via the
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environment variable 'GIT_DIFF_OPTS'. For example, if you
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prefer context diff:
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GIT_DIFF_OPTS=-c git-diff-cache -p $(cat .git/HEAD)
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2. When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
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program named by it is called, instead of the diff invocation
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described above.
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+
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For a path that is added, removed, or modified,
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'GIT_EXTERNAL_DIFF' is called with 7 parameters:
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path old-file old-hex old-mode new-file new-hex new-mode
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+
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where:
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<old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
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contents of <old|ne>,
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<old|new>-hex:: are the 40-hexdigit SHA1 hashes,
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<old|new>-mode:: are the octal representation of the file modes.
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+
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The file parameters can point at the user's working file
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(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
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when a new file is added), or a temporary file (e.g. `old-file` in the
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cache). 'GIT_EXTERNAL_DIFF' should not worry about unlinking the
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temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
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For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
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parameter, <path>.
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