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81e50eabf0
Update the diff-raw format as Linus and I discussed, except that it does not use sequence of underscore '_' letters to express nonexistence. All '0' mode is used for that purpose instead. The new diff-raw format can express rename/copy, and the earlier restriction that -M and -C _must_ be used with the patch format output is no longer necessary. The patch makes -M and -C flags independent of -p flag, so you need to say git-whatchanged -M -p to get the diff/patch format. Updated are both documentations and tests. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
95 lines
3.2 KiB
Plaintext
95 lines
3.2 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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':' <mode> ' ' <mode> ' ' <sha1> ' ' <sha1> I <path> I <path> L
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By default, I and L are '\t' and '\n' respectively. When '-z'
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flag is in effect, both I and L are '\0'.
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In each <mode>, <sha1> and <path> pair, left hand side describes
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the left hand side of what is being compared (<tree-ish> in
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git-diff-cache, <tree-ish-1> in git-diff-tree, cache contents in
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git-diff-files). Non-existence is shown by having 000000 in the
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<mode> column. That is, 000000 appears as the first <mode> for
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newly created files, and as the second <mode> for deleted files.
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Usually two <path> are the same. When rename/copy detection is
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used, however, an "create" and another "delete" records can be
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merged into a single record that has two <path>, old name and
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new name.
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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...... file.c 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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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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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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