[PATCH] Introduce diff-tree-helper.

This patch introduces a new program, diff-tree-helper.  It reads
output from diff-cache and diff-tree, and produces a patch file.
The diff format customization can be done the same way the
show-diff uses; the same external diff interface introduced by
the previous patch to drive diff from show-diff is used so this
is not surprising.

It is used like the following examples:

   $ diff-cache --cached -z <tree> | diff-tree-helper -z -R paths...
   $ diff-tree -r -z <tree1> <tree2> | diff-tree-helper -z paths...

 - As usual, the use of the -z flag is recommended in the script
   to pass NUL-terminated filenames through the pipe between
   commands.

 - The -R flag is used to generate reverse diff.  It does not
   matter for diff-tree case, but it is sometimes useful to get
   a patch in the desired direction out of diff-cache.

 - The paths parameters are used to restrict the paths that
   appears in the output.  Again this is useful to use with
   diff-cache, which, unlike diff-tree, does not take such paths
   restriction parameters.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/strbuf.h b/strbuf.h
new file mode 100644
index 0000000000..da678e506f
--- /dev/null
+++ b/strbuf.h
@@ -0,0 +1,13 @@
+#ifndef STRBUF_H
+#define STRBUF_H
+struct strbuf {
+	int alloc;
+	int len;
+	int eof;
+	unsigned char *buf;
+};
+
+extern void strbuf_init(struct strbuf *);
+extern void read_line(struct strbuf *, FILE *, int);
+
+#endif /* STRBUF_H */