X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=Documentation%2Fdiff-format.txt;h=9298d79e51bf87ccff66357227c7df4db4c820c4;hb=2c6e4771959dbe8116f39587d912f1215c06cd0d;hp=9e645399752e9b18f097840906fc640a1121d982;hpb=99665af5c0be0fe4319b39183e84917993153576;p=git.git

diff --git a/Documentation/diff-format.txt b/Documentation/diff-format.txt
index 9e645399..9298d79e 100644
--- a/Documentation/diff-format.txt
+++ b/Documentation/diff-format.txt
@@ -16,32 +16,44 @@ git-diff-tree [-r] <tree-ish-1> <tree-ish-2> [<pattern>...]::
 git-diff-files [<pattern>...]::
         compares the cache and the files on the filesystem.
 
-The following desription uses "old" and "new" to mean those
-compared entities.
-
-For files in old but not in new (i.e. removed):
-
-    -<mode> \t <type> \t <object> \t <path>
-
-For files not in old but in new (i.e. added):
-
-    +<mode> \t <type> \t <object> \t <path>
-
-For files that differ:
-
-    *<old-mode>-><new-mode> \t <type> \t <old-sha1>-><new-sha1> \t <path>
-
-<new-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:
-
-  *100644->100644 blob    5be4a4.......->000000.......      file.c
 
+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
+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) a space.
+ (10) status, followed by optional "score" number.
+ (11) a tab or a NUL when '-z' option is used.
+ (12) path for "src"
+ (13) a tab or a NUL when '-z' option is used; only exists for C or R.
+ (14) path for "dst"; only exists for C or R.
+ (15) 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:
+
+  :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
+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
@@ -50,7 +62,7 @@ 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>
@@ -87,3 +99,37 @@ 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/ filename.
+
+     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>