[PATCH] rev-{list,parse}: allow -<n> as shorthand for --max-count=<n>

[Eric Wong <normalperson@yhbt.net>]

Some versions of head(1) and tail(1) allow their line limits to be
parsed this way.  I find --max-count to be a commonly used option,
and also similar in spirit to head/tail, so I decided to make life
easier on my worn out (and lazy :) fingers with this patch.

Signed-off-by: Eric Wong <normalperson@yhbt.net>

---

 rev-list.c  |    5 +++++
 rev-parse.c |    4 ++++
 2 files changed, 9 insertions(+), 0 deletions(-)

68df4b28986a4642119373e18a63751be0e26366
diff --git a/rev-list.c b/rev-list.c
index d060966..2bbd699 100644
--- a/rev-list.c
+++ b/rev-list.c
@@ -732,6 +732,11 @@ int main(int argc, const char **argv)
 		struct commit *commit;
 		unsigned char sha1[20];
 
+		/* accept, -<digit>, like some versions of head/tail  */
+		if (*arg == '-' && isdigit(arg[1])) {
+			max_count = atoi(arg + 1);
+			continue;
+		}
 		if (!strncmp(arg, "--max-count=", 12)) {
 			max_count = atoi(arg + 12);
 			continue;
diff --git a/rev-parse.c b/rev-parse.c
index 0c951af..4dfc1a9 100644
--- a/rev-parse.c
+++ b/rev-parse.c
@@ -52,6 +52,10 @@ static int is_rev_argument(const char *a
 	};
 	const char **p = rev_args;
 
+	/* accept, -<digit>, like some versions of head/tail  */
+	if (*arg == '-' && isdigit(arg[1]))
+		return 1;
+
 	for (;;) {
 		const char *str = *p++;
 		int len;
-- 
1.1.4.g68df