Teach git-rev-list about non-commit objects

Now you can give git-rev-list tags, trees and blobs, and it will do the
proper reachability for them all. Knock wood.

Of course, you need the "--objects" flag to do anything but plain
commits.

diff --git a/rev-list.c b/rev-list.c
index ca8cc92..362342e 100644 (file)
--- a/rev-list.c
+++ b/rev-list.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "tag.h"
 #include "commit.h"
 #include "tree.h"
 #include "blob.h"
@@ -103,7 +104,7 @@ static struct object_list **add_object(struct object *obj, struct object_list **
 {
        struct object_list *entry = xmalloc(sizeof(*entry));
        entry->item = obj;
-       entry->next = NULL;
+       entry->next = *p;
        entry->name = name;
        *p = entry;
        return &entry->next;
@@ -143,9 +144,11 @@ static struct object_list **process_tree(struct tree *tree, struct object_list *
        return p;
 }
 
+static struct object_list *pending_objects = NULL;
+
 static void show_commit_list(struct commit_list *list)
 {
-       struct object_list *objects = NULL, **p = &objects;
+       struct object_list *objects = NULL, **p = &objects, *pending;
        while (list) {
                struct commit *commit = pop_most_recent_commit(&list, SEEN);
 
@@ -153,6 +156,26 @@ static void show_commit_list(struct commit_list *list)
                if (process_commit(commit) == STOP)
                        break;
        }
+       for (pending = pending_objects; pending; pending = pending->next) {
+               struct object *obj = pending->item;
+               const char *name = pending->name;
+               if (obj->flags & (UNINTERESTING | SEEN))
+                       continue;
+               if (obj->type == tag_type) {
+                       obj->flags |= SEEN;
+                       p = add_object(obj, p, name);
+                       continue;
+               }
+               if (obj->type == tree_type) {
+                       p = process_tree((struct tree *)obj, p, name);
+                       continue;
+               }
+               if (obj->type == blob_type) {
+                       p = process_blob((struct blob *)obj, p, name);
+                       continue;
+               }
+               die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
+       }
        while (objects) {
                printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
                objects = objects->next;
@@ -291,7 +314,7 @@ struct commit_list *limit_list(struct commit_list *list)
 {
        struct commit_list *newlist = NULL;
        struct commit_list **p = &newlist;
-       do {
+       while (list) {
                struct commit *commit = pop_most_recent_commit(&list, SEEN);
                struct object *obj = &commit->object;
 
@@ -302,24 +325,82 @@ struct commit_list *limit_list(struct commit_list *list)
                        continue;
                }
                p = &commit_list_insert(commit, p)->next;
-       } while (list);
+       }
        if (bisect_list)
                newlist = find_bisection(newlist);
        return newlist;
 }
 
+static void add_pending_object(struct object *obj, const char *name)
+{
+       add_object(obj, &pending_objects, name);
+}
+
 static struct commit *get_commit_reference(const char *name, unsigned int flags)
 {
        unsigned char sha1[20];
-       struct commit *commit;
+       struct object *object;
 
        if (get_sha1(name, sha1))
                usage(rev_list_usage);
-       commit = lookup_commit_reference(sha1);
-       if (!commit || parse_commit(commit) < 0)
-               die("bad commit object %s", name);
-       commit->object.flags |= flags;
-       return commit;
+       object = parse_object(sha1);
+       if (!object)
+               die("bad object %s", name);
+
+       /*
+        * Tag object? Look what it points to..
+        */
+       if (object->type == tag_type) {
+               struct tag *tag = (struct tag *) object;
+               object->flags |= flags;
+               if (tag_objects && !(object->flags & UNINTERESTING))
+                       add_pending_object(object, tag->tag);
+               object = tag->tagged;
+       }
+
+       /*
+        * Commit object? Just return it, we'll do all the complex
+        * reachability crud.
+        */
+       if (object->type == commit_type) {
+               struct commit *commit = (struct commit *)object;
+               object->flags |= flags;
+               if (parse_commit(commit) < 0)
+                       die("unable to parse commit %s", name);
+               return commit;
+       }
+
+       /*
+        * Tree object? Either mark it uniniteresting, or add it
+        * to the list of objects to look at later..
+        */
+       if (object->type == tree_type) {
+               struct tree *tree = (struct tree *)object;
+               if (!tree_objects)
+                       die("%s is a tree object, not a commit", name);
+               if (flags & UNINTERESTING) {
+                       mark_tree_uninteresting(tree);
+                       return NULL;
+               }
+               add_pending_object(object, "");
+               return NULL;
+       }
+
+       /*
+        * Blob object? You know the drill by now..
+        */
+       if (object->type == blob_type) {
+               struct blob *blob = (struct blob *)object;
+               if (!blob_objects)
+                       die("%s is a blob object, not a commit", name);
+               if (flags & UNINTERESTING) {
+                       mark_blob_uninteresting(blob);
+                       return NULL;
+               }
+               add_pending_object(object, "");
+               return NULL;
+       }
+       die("%s is unknown object", name);
 }
 
 int main(int argc, char **argv)
@@ -392,9 +473,6 @@ int main(int argc, char **argv)
                commit_list_insert(commit, &list);
        }
 
-       if (!list)
-               usage(rev_list_usage);
-
        if (!merge_order) {             
                if (limited)
                        list = limit_list(list);