git-rev-tree: teach it about tag references

And various cleanups that makes it able to not care.

diff --git a/rev-tree.c b/rev-tree.c
index bc190eb..7f92819 100644 (file)
--- a/rev-tree.c
+++ b/rev-tree.c
@@ -7,6 +7,9 @@
  * this commit <N>" bitmask.
  */
 #define MAX_COMMITS 16
+#define REACHABLE (1U << 16)
+
+#define cmit_flags(cmit) ((cmit)->object.flags & ~REACHABLE)
 
 static int show_edges = 0;
 static int basemask = 0;
@@ -27,14 +30,14 @@ static void read_cache_file(const char *path)
  */
 static int interesting(struct commit *rev)
 {
-       unsigned mask = rev->object.flags;
+       unsigned mask = cmit_flags(rev);
 
        if (!mask)
                return 0;
        if (show_edges) {
                struct commit_list *p = rev->parents;
                while (p) {
-                       if (mask != p->item->object.flags)
+                       if (mask != cmit_flags(p->item))
                                return 1;
                        p = p->next;
                }
@@ -46,23 +49,6 @@ static int interesting(struct commit *rev)
        return 1;
 }
 
-static void process_commit(unsigned char *sha1)
-{
-       struct commit_list *parents;
-       struct commit *obj = lookup_commit(sha1);
-
-       if (obj && obj->object.parsed)
-               return;
-       if (!obj || parse_commit(obj))
-               die("unable to parse commit (%s)", sha1_to_hex(sha1));
-
-       parents = obj->parents;
-       while (parents) {
-               process_commit(parents->item->object.sha1);
-               parents = parents->next;
-       }
-}
-
 /*
  * Usage: git-rev-tree [--edges] [--cache <cache-file>] <commit-id> [<commit-id2>]
  *
@@ -75,6 +61,7 @@ int main(int argc, char **argv)
        int i;
        int nr = 0;
        unsigned char sha1[MAX_COMMITS][20];
+       struct commit_list *list = NULL;
 
        /*
         * First - pick up all the revisions we can (both from
@@ -82,6 +69,7 @@ int main(int argc, char **argv)
         */
        for (i = 1; i < argc ; i++) {
                char *arg = argv[i];
+               struct commit *commit;
 
                if (!strcmp(arg, "--cache")) {
                        read_cache_file(argv[++i]);
@@ -99,15 +87,28 @@ int main(int argc, char **argv)
                }
                if (nr >= MAX_COMMITS || get_sha1(arg, sha1[nr]))
                        usage("git-rev-tree [--edges] [--cache <cache-file>] <commit-id> [<commit-id>]");
-               process_commit(sha1[nr]);
+
+               commit = lookup_commit_reference(sha1[nr]);
+               if (!commit || parse_commit(commit) < 0)
+                       die("bad commit object");
+               commit_list_insert(commit, &list);
                nr++;
        }
 
        /*
+        * Parse all the commits in date order.
+        *
+        * We really should stop once we know enough, but that's a
+        * decision that isn't trivial to make.
+        */
+       while (list)
+               pop_most_recent_commit(&list, REACHABLE);
+
+       /*
         * Now we have the maximal tree. Walk the different sha files back to the root.
         */
        for (i = 0; i < nr; i++)
-               mark_reachable(&lookup_commit(sha1[i])->object, 1 << i);
+               mark_reachable(&lookup_commit_reference(sha1[i])->object, 1 << i);
 
        /*
         * Now print out the results..
@@ -125,12 +126,12 @@ int main(int argc, char **argv)
                if (!interesting(commit))
                        continue;
 
-               printf("%lu %s:%d", commit->date, sha1_to_hex(obj->sha1), 
-                      obj->flags);
+               printf("%lu %s:%d", commit->date, sha1_to_hex(obj->sha1),
+                                   cmit_flags(commit));
                p = commit->parents;
                while (p) {
                        printf(" %s:%d", sha1_to_hex(p->item->object.sha1), 
-                              p->item->object.flags);
+                              cmit_flags(p->item));
                        p = p->next;
                }
                printf("\n");