ref-filter: modify "%(objectname:short)" to take length

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 17cbfabdde3845099e0ffd303db5e4a730e5262b..ff13e59e1dbd200b6e7cf7d1c508b620b19e8cc7 100644 (file)
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -298,14 +298,30 @@ static int try_parent_shorthands(const char *arg)
        unsigned char sha1[20];
        struct commit *commit;
        struct commit_list *parents;
-       int parents_only;
-
-       if ((dotdot = strstr(arg, "^!")))
-               parents_only = 0;
-       else if ((dotdot = strstr(arg, "^@")))
-               parents_only = 1;
-
-       if (!dotdot || dotdot[2])
+       int parent_number;
+       int include_rev = 0;
+       int include_parents = 0;
+       int exclude_parent = 0;
+
+       if ((dotdot = strstr(arg, "^!"))) {
+               include_rev = 1;
+               if (dotdot[2])
+                       return 0;
+       } else if ((dotdot = strstr(arg, "^@"))) {
+               include_parents = 1;
+               if (dotdot[2])
+                       return 0;
+       } else if ((dotdot = strstr(arg, "^-"))) {
+               include_rev = 1;
+               exclude_parent = 1;
+
+               if (dotdot[2]) {
+                       char *end;
+                       exclude_parent = strtoul(dotdot + 2, &end, 10);
+                       if (*end != '\0' || !exclude_parent)
+                               return 0;
+               }
+       } else
                return 0;
 
        *dotdot = 0;
@@ -314,12 +330,29 @@ static int try_parent_shorthands(const char *arg)
                return 0;
        }
 
-       if (!parents_only)
-               show_rev(NORMAL, sha1, arg);
        commit = lookup_commit_reference(sha1);
-       for (parents = commit->parents; parents; parents = parents->next)
-               show_rev(parents_only ? NORMAL : REVERSED,
-                               parents->item->object.oid.hash, arg);
+       if (exclude_parent &&
+           exclude_parent > commit_list_count(commit->parents)) {
+               *dotdot = '^';
+               return 0;
+       }
+
+       if (include_rev)
+               show_rev(NORMAL, sha1, arg);
+       for (parents = commit->parents, parent_number = 1;
+            parents;
+            parents = parents->next, parent_number++) {
+               char *name = NULL;
+
+               if (exclude_parent && parent_number != exclude_parent)
+                       continue;
+
+               if (symbolic)
+                       name = xstrfmt("%s^%d", arg, parent_number);
+               show_rev(include_parents ? NORMAL : REVERSED,
+                        parents->item->object.oid.hash, name);
+               free(name);
+       }
 
        *dotdot = '^';
        return 1;