[PATCH] Clean up diff option descriptions.

I got tired of maintaining almost duplicated descriptions in
diff-* brothers, both in usage string and documentation.

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

1 files changed, 20 insertions, 0 deletions

diff --git a/diff.h b/diff.h
index 46c0e236c3..9f9ca8be5b 100644
--- a/diff.h
+++ b/diff.h
@@ -53,6 +53,26 @@ extern void diffcore_std_no_resolve(const char **paths,
 				    const char *pickaxe, int pickaxe_opts,
 				    const char *orderfile, const char *filter);
 
+#define COMMON_DIFF_OPTIONS_HELP \
+"\ncommon diff options:\n" \
+"  -r		diff recursively (only meaningful in diff-tree)\n" \
+"  -z		output diff-raw with lines terminated with NUL.\n" \
+"  -p		output patch format.\n" \
+"  -u		synonym for -p.\n" \
+"  --name-only	show only names of changed files.\n" \
+"  --name-only-z\n" \
+"		same as --name-only but terminate lines with NUL.\n" \
+"  -R		swap input file pairs.\n" \
+"  -B		detect complete rewrites.\n" \
+"  -M		detect renames.\n" \
+"  -C		detect copies.\n" \
+"  --find-copies-harder\n" \
+"		try unchanged files as candidate for copy detection.\n" \
+"  -O<file>	reorder diffs according to the <file>.\n" \
+"  -S<string>	find filepair whose only one side contains the string.\n" \
+"  --pickaxe-all\n" \
+"		show all files diff when -S is used and hit is found.\n"
+
 extern int diff_queue_is_empty(void);
 
 #define DIFF_FORMAT_HUMAN	0