Move read_revisions_from_stdin from builtin-rev-list.c to revision.c

Reading rev-list parameters from the command line can be reused by
commands other than rev-list.  Move this function to more "library-ish"
place to promote code reuse.

Signed-off-by: Adam Brewster <asb@bu.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-rev-list.c

@@ -565,23 +565,6 @@ static struct commit_list *find_bisection(struct commit_list *list,
 	return best;
 }
 
-static void read_revisions_from_stdin(struct rev_info *revs)
-{
-	char line[1000];
-
-	while (fgets(line, sizeof(line), stdin) != NULL) {
-		int len = strlen(line);
-		if (len && line[len - 1] == '\n')
-			line[--len] = 0;
-		if (!len)
-			break;
-		if (line[0] == '-')
-			die("options not supported in --stdin mode");
-		if (handle_revision_arg(line, revs, 0, 1))
-			die("bad revision '%s'", line);
-	}
-}
-
 int cmd_rev_list(int argc, const char **argv, const char *prefix)
 {
 	struct commit_list *list;

revision.c

@@ -910,6 +910,23 @@ int handle_revision_arg(const char *arg, struct rev_info *revs,
 	return 0;
 }
 
+void read_revisions_from_stdin(struct rev_info *revs)
+{
+	char line[1000];
+
+	while (fgets(line, sizeof(line), stdin) != NULL) {
+		int len = strlen(line);
+		if (len && line[len - 1] == '\n')
+			line[--len] = '\0';
+		if (!len)
+			break;
+		if (line[0] == '-')
+			die("options not supported in --stdin mode");
+		if (handle_revision_arg(line, revs, 0, 1))
+			die("bad revision '%s'", line);
+	}
+}
+
 static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
 {
 	if (!revs->grep_filter) {

revision.h

@@ -111,6 +111,8 @@ struct rev_info {
 #define REV_TREE_DIFFERENT	2
 
 /* revision.c */
+void read_revisions_from_stdin(struct rev_info *revs);
+
 typedef void (*show_early_output_fn_t)(struct rev_info *, struct commit_list *);
 volatile show_early_output_fn_t show_early_output;