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Diffstat (limited to 'builtin/diff-tree.c')
-rw-r--r--builtin/diff-tree.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c
index 802363d0a2..9fc95e959f 100644
--- a/builtin/diff-tree.c
+++ b/builtin/diff-tree.c
@@ -111,6 +111,7 @@ int cmd_diff_tree(int argc, const char **argv, const char *prefix)
struct setup_revision_opt s_r_opt;
struct userformat_want w;
int read_stdin = 0;
+ int merge_base = 0;
if (argc == 2 && !strcmp(argv[1], "-h"))
usage(diff_tree_usage);
@@ -143,9 +144,18 @@ int cmd_diff_tree(int argc, const char **argv, const char *prefix)
read_stdin = 1;
continue;
}
+ if (!strcmp(arg, "--merge-base")) {
+ merge_base = 1;
+ continue;
+ }
usage(diff_tree_usage);
}
+ if (read_stdin && merge_base)
+ die(_("--stdin and --merge-base are mutually exclusive"));
+ if (merge_base && opt->pending.nr != 2)
+ die(_("--merge-base only works with two commits"));
+
/*
* NOTE! We expect "a..b" to expand to "^a b" but it is
* perfectly valid for revision range parser to yield "b ^a",
@@ -165,7 +175,12 @@ int cmd_diff_tree(int argc, const char **argv, const char *prefix)
case 2:
tree1 = opt->pending.objects[0].item;
tree2 = opt->pending.objects[1].item;
- if (tree2->flags & UNINTERESTING) {
+ if (merge_base) {
+ struct object_id oid;
+
+ diff_get_merge_base(opt, &oid);
+ tree1 = lookup_object(the_repository, &oid);
+ } else if (tree2->flags & UNINTERESTING) {
SWAP(tree2, tree1);
}
diff_tree_oid(&tree1->oid, &tree2->oid, "", &opt->diffopt);