fast-export: move commit rewriting logic into a function for reuse

Logic to replace a filtered commit with an unfiltered ancestor is useful
elsewhere; put it into a function we can call.

Signed-off-by: Elijah Newren <newren@gmail.com>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 7d50f5414e2f3b1506ecbdfcfceff80696fbf055..43e98a38a8f81561853a0357efbedfd3552fc21c 100644 (file)
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -187,6 +187,22 @@ static int get_object_mark(struct object *object)
        return ptr_to_mark(decoration);
 }
 
+static struct commit *rewrite_commit(struct commit *p)
+{
+       for (;;) {
+               if (p->parents && p->parents->next)
+                       break;
+               if (p->object.flags & UNINTERESTING)
+                       break;
+               if (!(p->object.flags & TREESAME))
+                       break;
+               if (!p->parents)
+                       return NULL;
+               p = p->parents->item;
+       }
+       return p;
+}
+
 static void show_progress(void)
 {
        static int counter = 0;
@@ -767,21 +783,12 @@ static void handle_tag(const char *name, struct tag *tag)
                                    oid_to_hex(&tag->object.oid),
                                    type_name(tagged->type));
                        }
-                       p = (struct commit *)tagged;
-                       for (;;) {
-                               if (p->parents && p->parents->next)
-                                       break;
-                               if (p->object.flags & UNINTERESTING)
-                                       break;
-                               if (!(p->object.flags & TREESAME))
-                                       break;
-                               if (!p->parents) {
-                                       printf("reset %s\nfrom %s\n\n",
-                                              name, oid_to_hex(&null_oid));
-                                       free(buf);
-                                       return;
-                               }
-                               p = p->parents->item;
+                       p = rewrite_commit((struct commit *)tagged);
+                       if (!p) {
+                               printf("reset %s\nfrom %s\n\n",
+                                      name, oid_to_hex(&null_oid));
+                               free(buf);
+                               return;
                        }
                        tagged_mark = get_object_mark(&p->object);
                }