Move print_commit_list to libgit.a

This is used by bisect.c, part of libgit.a while it stays in
builtin/rev-list.c. Move it to commit.c so that we won't get undefined
reference if a program that uses libgit.a happens to pull it in.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>

bisect.h

@@ -11,10 +11,6 @@ extern struct commit_list *filter_skipped(struct commit_list *list,
 					  int *count,
 					  int *skipped_first);
 
-extern void print_commit_list(struct commit_list *list,
-			      const char *format_cur,
-			      const char *format_last);
-
 #define BISECT_SHOW_ALL		(1<<0)
 #define REV_LIST_QUIET		(1<<1)
 

builtin/rev-list.c

@@ -201,16 +201,6 @@ static void show_edge(struct commit *commit)
 	printf("-%s\n", sha1_to_hex(commit->object.sha1));
 }
 
-void print_commit_list(struct commit_list *list,
-		       const char *format_cur,
-		       const char *format_last)
-{
-	for ( ; list; list = list->next) {
-		const char *format = list->next ? format_cur : format_last;
-		printf(format, sha1_to_hex(list->item->object.sha1));
-	}
-}
-
 static void print_var_str(const char *var, const char *val)
 {
 	printf("%s='%s'\n", var, val);

commit.c

@@ -1347,3 +1347,13 @@ struct commit_list **commit_list_append(struct commit *commit,
 	new->next = NULL;
 	return &new->next;
 }
+
+void print_commit_list(struct commit_list *list,
+		       const char *format_cur,
+		       const char *format_last)
+{
+	for ( ; list; list = list->next) {
+		const char *format = list->next ? format_cur : format_last;
+		printf(format, sha1_to_hex(list->item->object.sha1));
+	}
+}

commit.h

@@ -222,4 +222,8 @@ struct commit *get_merge_parent(const char *name);
 
 extern int parse_signed_commit(const unsigned char *sha1,
 			       struct strbuf *message, struct strbuf *signature);
+extern void print_commit_list(struct commit_list *list,
+			      const char *format_cur,
+			      const char *format_last);
+
 #endif /* COMMIT_H */