[PATCH 3/4 v4] revision.c: args starting with "-" might be a revision

[Siddharth Kannan <kannan.siddharth12@gmail.com>]

setup_revisions used to consider any argument starting with "-" to be either a
valid or an unknown option.

Teach setup_revisions to check if an argument is a revision before adding it as
an unknown option (something that setup_revisions didn't understand) to argv,
and moving on to the next argument.

This patch prepares the addition of "-" as a shorthand for "previous branch".

Signed-off-by: Siddharth Kannan <kannan.siddharth12@gmail.com>
---
 revision.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/revision.c b/revision.c
index 8d4ddae..5470c33 100644
--- a/revision.c
+++ b/revision.c
@@ -2203,6 +2203,7 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
 	read_from_stdin = 0;
 	for (left = i = 1; i < argc; i++) {
 		const char *arg = argv[i];
+		int maybe_opt = 0;
 		if (*arg == '-') {
 			int opts;
 
@@ -2232,15 +2233,17 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
 			}
 			if (opts < 0)
 				exit(128);
-			/* arg is an unknown option */
-			argv[left++] = arg;
-			continue;
+			maybe_opt = 1;
 		}
 
 
 		if (!handle_revision_arg(arg, revs, flags, revarg_opt))
 			got_rev_arg = 1;
-		else {
+		else if (maybe_opt) {
+			/* arg is an unknown option */
+			argv[left++] = arg;
+			continue;
+		} else {
 			int j;
 			if (seen_dashdash || *arg == '^')
 				die("bad revision '%s'", arg);
-- 
2.1.4