regex: use regexec_buf()

diff --git a/Documentation/git-diff-tree.txt b/Documentation/git-diff-tree.txt
index 1fdf20dcc9169be2c7a51b32f94893442e160436..1439486e40ec4a8a1146310bf929d688eb01d533 100644 (file)
--- a/Documentation/git-diff-tree.txt
+++ b/Documentation/git-diff-tree.txt
@@ -20,7 +20,7 @@ Compares the content and mode of the blobs found via two tree objects.
 If there is only one <tree-ish> given, the commit is compared with its parents
 (see --stdin below).
 
-Note that 'git-diff-tree' can use the tree encapsulated in a commit object.
+Note that 'git diff-tree' can use the tree encapsulated in a commit object.
 
 OPTIONS
 -------
@@ -43,40 +43,49 @@ include::diff-options.txt[]
        show tree entry itself as well as subtrees.  Implies -r.
 
 --root::
-       When '--root' is specified the initial commit will be showed as a big
+       When '--root' is specified the initial commit will be shown as a big
        creation event. This is equivalent to a diff against the NULL tree.
 
 --stdin::
        When '--stdin' is specified, the command does not take
        <tree-ish> arguments from the command line.  Instead, it
-       reads either one <commit> or a list of <commit>
-       separated with a single space from its standard input.
+       reads lines containing either two <tree>, one <commit>, or a
+       list of <commit> from its standard input.  (Use a single space
+       as separator.)
 +
-When a single commit is given on one line of such input, it compares
-the commit with its parents.  The following flags further affects its
-behavior.  The remaining commits, when given, are used as if they are
+When two trees are given, it compares the first tree with the second.
+When a single commit is given, it compares the commit with its
+parents.  The remaining commits, when given, are used as if they are
 parents of the first commit.
++
+When comparing two trees, the ID of both trees (separated by a space
+and terminated by a newline) is printed before the difference.  When
+comparing commits, the ID of the first (or only) commit, followed by a
+newline, is printed.
++
+The following flags further affect the behavior when comparing
+commits (but not trees).
 
 -m::
-       By default, 'git-diff-tree --stdin' does not show
+       By default, 'git diff-tree --stdin' does not show
        differences for merge commits.  With this flag, it shows
        differences to that commit from all of its parents. See
        also '-c'.
 
 -s::
-       By default, 'git-diff-tree --stdin' shows differences,
+       By default, 'git diff-tree --stdin' shows differences,
        either in machine-readable form (without '-p') or in patch
        form (with '-p').  This output can be suppressed.  It is
        only useful with '-v' flag.
 
 -v::
-       This flag causes 'git-diff-tree --stdin' to also show
+       This flag causes 'git diff-tree --stdin' to also show
        the commit message before the differences.
 
 include::pretty-options.txt[]
 
 --no-commit-id::
-       'git-diff-tree' outputs a line with the commit ID when
+       'git diff-tree' outputs a line with the commit ID when
        applicable.  This flag suppressed the commit ID output.
 
 -c::
@@ -129,8 +138,8 @@ so it can be used to name subdirectories.
 
 An example of normal usage is:
 
-  torvalds@ppc970:~/git> git diff-tree 5319e4......
-  *100664->100664 blob    ac348b.......->a01513.......      git-fsck-objects.c
+  torvalds@ppc970:~/git> git diff-tree --abbrev 5319e4
+  :100664 100664 ac348b... a01513...   git-fsck-objects.c
 
 which tells you that the last commit changed just one file (it's from
 this one:
@@ -150,18 +159,8 @@ HEAD commits it finds, which is even more interesting.
 
 in case you care).
 
-Output format
--------------
-include::diff-format.txt[]
-
-
-Author
-------
-Written by Linus Torvalds <torvalds@osdl.org>
 
-Documentation
---------------
-Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>.
+include::diff-format.txt[]
 
 GIT
 ---