X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=Documentation%2Fdiff-format.txt;h=424e75a1c2d4747226ac1b55caac90b544f8f273;hb=b595ed1478e6240593df4c927c4a240575f53d44;hp=1d92a01a02543e55d0feb3541ee594fbc638136c;hpb=ddafa7e93325d45cd4bd950dd8e89ff3188d0250;p=git.git

diff --git a/Documentation/diff-format.txt b/Documentation/diff-format.txt
index 1d92a01a..424e75a1 100644
--- a/Documentation/diff-format.txt
+++ b/Documentation/diff-format.txt
@@ -1,13 +1,13 @@
-The output format from "git-diff-cache", "git-diff-tree" and
-"git-diff-files" is very similar.
+The output format from "git-diff-index", "git-diff-tree" and
+"git-diff-files" are very similar.
 
 These commands all compare two sets of things; what are
 compared are different:
 
-git-diff-cache <tree-ish>::
+git-diff-index <tree-ish>::
         compares the <tree-ish> and the files on the filesystem.
 
-git-diff-cache --cached <tree-ish>::
+git-diff-index --cached <tree-ish>::
         compares the <tree-ish> and the cache.
 
 git-diff-tree [-r] <tree-ish-1> <tree-ish-2> [<pattern>...]::
@@ -19,40 +19,47 @@ git-diff-files [<pattern>...]::
 
 An output line is formatted this way:
 
+------------------------------------------------
 in-place edit  :100644 100644 bcd1234... 0123456... M file0
 copy-edit      :100644 100644 abcd123... 1234567... C68 file1 file2
 rename-edit    :100644 100644 abcd123... 1234567... R86 file1 file3
-create         :000000 100644 0000000... 1234567... N file4
+create         :000000 100644 0000000... 1234567... A file4
 delete         :100644 000000 1234567... 0000000... D file5
 unmerged       :000000 000000 0000000... 0000000... U file6
+------------------------------------------------
 
 That is, from the left to the right:
 
-  (1) a colon.
-  (2) mode for "src"; 000000 if creation or unmerged.
-  (3) a space.
-  (4) mode for "dst"; 000000 if deletion or unmerged.
-  (5) a space.
-  (6) sha1 for "src"; 0{40} if creation or unmerged.
-  (7) a space.
-  (8) sha1 for "dst"; 0{40} if creation, unmerged or "look at work tree".
-  (9) status, followed by optional "score" number.
- (10) a tab or a NUL when '-z' option is used.
- (11) path for "src"
- (12) a tab or a NUL when '-z' option is used; only exists for C or R.
- (13) path for "dst"; only exists for C or R.
- (14) an LF or a NUL when '-z' option is used, to terminate the record.
+. a colon.
+. mode for "src"; 000000 if creation or unmerged.
+. a space.
+. mode for "dst"; 000000 if deletion or unmerged.
+. a space.
+. sha1 for "src"; 0\{40\} if creation or unmerged.
+. a space.
+. sha1 for "dst"; 0\{40\} if creation, unmerged or "look at work tree".
+. a space.
+. status, followed by optional "score" number.
+. a tab or a NUL when '-z' option is used.
+. path for "src"
+. a tab or a NUL when '-z' option is used; only exists for C or R.
+. path for "dst"; only exists for C or R.
+. an LF or a NUL when '-z' option is used, to terminate the record.
 
 <sha1> is shown as all 0's if new is a file on the filesystem
-and it is out of sync with the cache.  Example:
+and it is out of sync with the cache.
 
-  :100644 100644 5be4a4...... 000000...... M file.c
+Example:
+
+------------------------------------------------
+:100644 100644 5be4a4...... 000000...... M file.c
+------------------------------------------------
 
 Generating patches with -p
 --------------------------
 
-When "git-diff-cache", "git-diff-tree", or "git-diff-files" are run
-with a '-p' option, they do not produce the output described above
+When "git-diff-index", "git-diff-tree", or "git-diff-files" are run
+with a '-p' option, they do not produce the output described above;
 instead they produce a patch file.
 
 The patch generation can be customized at two levels.  This
@@ -61,7 +68,7 @@ customization also applies to "git-diff-helper".
 1. When the environment variable 'GIT_EXTERNAL_DIFF' is not set,
    these commands internally invoke "diff" like this:
 
-      diff -L a/<path> -L a/<path> -pu <old> <new>
+      diff -L a/<path> -L b/<path> -pu <old> <new>
 +
 For added files, `/dev/null` is used for <old>.  For removed
 files, `/dev/null` is used for <new>
@@ -70,7 +77,7 @@ The "diff" formatting options can be customized via the
 environment variable 'GIT_DIFF_OPTS'.  For example, if you
 prefer context diff:
 
-      GIT_DIFF_OPTS=-c git-diff-cache -p $(cat .git/HEAD)
+      GIT_DIFF_OPTS=-c git-diff-index -p $(cat .git/HEAD)
 
 
 2. When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
@@ -98,3 +105,37 @@ temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 
 For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 parameter, <path>.
+
+
+Git specific extension to diff format
+-------------------------------------
+
+What -p option produces is slightly different from the
+traditional diff format.
+
+1.   It is preceeded with a "git diff" header, that looks like
+     this:
+
+     diff --git a/file1 b/file2
++
+The `a/` and `b/` filenames are the same unless rename/copy is
+involved.  Especially, even for a creation or a deletion,
+`/dev/null` is _not_ used in place of `a/` or `b/` filenames.
++
+When rename/copy is involved, `file1` and `file2` shows the
+name of the source file of the rename/copy and the name of
+the file that rename/copy produces, respectively.
+
+2.   It is followed by extended header lines that are one or
+     more of:
+
+       old mode <mode>
+       new mode <mode>
+       deleted file mode <mode>
+       new file mode <mode>
+       copy from <path>
+       copy to <path>
+       rename from <path>
+       rename to <path>
+       similarity index <number>
+       dissimilarity index <number>