Git.pm: Handle failed commands' output

diff --git a/builtin-diff-tree.c b/builtin-diff-tree.c
index cc53b81ac427f27522130e741350b955f4b1f653..3409a39a9f73f9ed67547f5cc79619c1e402f47b 100644 (file)
--- a/builtin-diff-tree.c
+++ b/builtin-diff-tree.c
@@ -65,7 +65,6 @@ int cmd_diff_tree(int argc, const char **argv, char **envp)
        char line[1000];
        struct object *tree1, *tree2;
        static struct rev_info *opt = &log_tree_opt;
-       struct object_list *list;
        int read_stdin = 0;
 
        git_config(git_diff_config);
@@ -86,45 +85,28 @@ int cmd_diff_tree(int argc, const char **argv, char **envp)
        }
 
        /*
-        * NOTE! "setup_revisions()" will have inserted the revisions
-        * it parsed in reverse order. So if you do
-        *
-        *      git-diff-tree a b
-        *
-        * the commit list will be "b" -> "a" -> NULL, so we reverse
-        * the order of the objects if the first one is not marked
-        * UNINTERESTING.
+        * NOTE! We expect "a ^b" to be equal to "a..b", so we
+        * reverse the order of the objects if the second one
+        * is marked UNINTERESTING.
         */
-       nr_sha1 = 0;
-       list = opt->pending_objects;
-       if (list) {
-               nr_sha1++;
-               tree1 = list->item;
-               list = list->next;
-               if (list) {
-                       nr_sha1++;
-                       tree2 = tree1;
-                       tree1 = list->item;
-                       if (list->next)
-                               usage(diff_tree_usage);
-                       /* Switch them around if the second one was uninteresting.. */
-                       if (tree2->flags & UNINTERESTING) {
-                               struct object *tmp = tree2;
-                               tree2 = tree1;
-                               tree1 = tmp;
-                       }
-               }
-       }
-
+       nr_sha1 = opt->pending.nr;
        switch (nr_sha1) {
        case 0:
                if (!read_stdin)
                        usage(diff_tree_usage);
                break;
        case 1:
+               tree1 = opt->pending.objects[0].item;
                diff_tree_commit_sha1(tree1->sha1);
                break;
        case 2:
+               tree1 = opt->pending.objects[0].item;
+               tree2 = opt->pending.objects[1].item;
+               if (tree2->flags & UNINTERESTING) {
+                       struct object *tmp = tree2;
+                       tree2 = tree1;
+                       tree1 = tmp;
+               }
                diff_tree_sha1(tree1->sha1,
                               tree2->sha1,
                               "", &opt->diffopt);
@@ -138,11 +120,15 @@ int cmd_diff_tree(int argc, const char **argv, char **envp)
        if (opt->diffopt.detect_rename)
                opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
                                       DIFF_SETUP_USE_CACHE);
-       while (fgets(line, sizeof(line), stdin))
-               if (line[0] == '\n')
+       while (fgets(line, sizeof(line), stdin)) {
+               unsigned char sha1[20];
+
+               if (get_sha1_hex(line, sha1)) {
+                       fputs(line, stdout);
                        fflush(stdout);
+               }
                else
                        diff_tree_stdin(line);
-
+       }
        return 0;
 }