cmd_diff(): use an object_array for holding trees

Change cmd_diff() to use a (struct object_array) for holding the trees
that it accumulates, rather than rolling its own equivalent.

Incidentally, this change removes a hard-coded limit of 100 trees in
combined diff, not that it matters in practice.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/diff.c b/builtin/diff.c
index abdd613a83f60bc9a7fc395e421d09a672bb5c59..661fdde4d5169a59232db5494edc85b06a9928cc 100644 (file)
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -253,8 +253,8 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 {
        int i;
        struct rev_info rev;
-       struct object_array_entry ent[100];
-       int ents = 0, blobs = 0, paths = 0;
+       struct object_array ent = OBJECT_ARRAY_INIT;
+       int blobs = 0, paths = 0;
        const char *path = NULL;
        struct blobinfo blob[2];
        int nongit;
@@ -351,13 +351,8 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
                if (obj->type == OBJ_COMMIT)
                        obj = &((struct commit *)obj)->tree->object;
                if (obj->type == OBJ_TREE) {
-                       if (ARRAY_SIZE(ent) <= ents)
-                               die(_("more than %d trees given: '%s'"),
-                                   (int) ARRAY_SIZE(ent), name);
                        obj->flags |= flags;
-                       ent[ents].item = obj;
-                       ent[ents].name = name;
-                       ents++;
+                       add_object_array(obj, name, &ent);
                        continue;
                }
                if (obj->type == OBJ_BLOB) {
@@ -381,7 +376,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
        /*
         * Now, do the arguments look reasonable?
         */
-       if (!ents) {
+       if (!ent.nr) {
                switch (blobs) {
                case 0:
                        result = builtin_diff_files(&rev, argc, argv);
@@ -402,22 +397,26 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
        }
        else if (blobs)
                usage(builtin_diff_usage);
-       else if (ents == 1)
+       else if (ent.nr == 1)
                result = builtin_diff_index(&rev, argc, argv);
-       else if (ents == 2)
-               result = builtin_diff_tree(&rev, argc, argv, &ent[0], &ent[1]);
-       else if (ent[0].item->flags & UNINTERESTING) {
+       else if (ent.nr == 2)
+               result = builtin_diff_tree(&rev, argc, argv,
+                                          &ent.objects[0], &ent.objects[1]);
+       else if (ent.objects[0].item->flags & UNINTERESTING) {
                /*
                 * diff A...B where there is at least one merge base
-                * between A and B.  We have ent[0] == merge-base,
-                * ent[ents-2] == A, and ent[ents-1] == B.  Show diff
-                * between the base and B.  Note that we pick one
-                * merge base at random if there are more than one.
+                * between A and B.  We have ent.objects[0] ==
+                * merge-base, ent.objects[ents-2] == A, and
+                * ent.objects[ents-1] == B.  Show diff between the
+                * base and B.  Note that we pick one merge base at
+                * random if there are more than one.
                 */
-               result = builtin_diff_tree(&rev, argc, argv, &ent[0], &ent[ents-1]);
+               result = builtin_diff_tree(&rev, argc, argv,
+                                          &ent.objects[0],
+                                          &ent.objects[ent.nr-1]);
        } else
                result = builtin_diff_combined(&rev, argc, argv,
-                                              ent, ents);
+                                              ent.objects, ent.nr);
        result = diff_result_code(&rev.diffopt, result);
        if (1 < rev.diffopt.skip_stat_unmatch)
                refresh_index_quietly();