git-diff-cache: fix argument parsing

And make the code more readable while at it.

diff --git a/diff-cache.c b/diff-cache.c
index 744fffb..d573459 100644 (file)
--- a/diff-cache.c
+++ b/diff-cache.c
@@ -158,16 +158,27 @@ static char *diff_cache_usage =
 
 int main(int argc, const char **argv)
 {
-       unsigned char tree_sha1[20];
+       const char *tree_name = NULL;
+       unsigned char sha1[20];
+       const char **pathspec = NULL;
        void *tree;
        unsigned long size;
        int ret;
+       int i;
 
        read_cache();
-       while (argc > 2) {
-               const char *arg = argv[1];
-               argv++;
-               argc--;
+       for (i = 1; i < argc; i++) {
+               const char *arg = argv[i];
+
+               if (*arg != '-') {
+                       if (tree_name) {
+                               pathspec = argv + i;
+                               break;
+                       }
+                       tree_name = arg;
+                       continue;
+               }
+                       
                if (!strcmp(arg, "-r")) {
                        /* We accept the -r flag just to look like git-diff-tree */
                        continue;
@@ -209,30 +220,27 @@ int main(int argc, const char **argv)
                usage(diff_cache_usage);
        }
 
-       if (argc < 2 || get_sha1(argv[1], tree_sha1))
+       if (!tree_name || get_sha1(tree_name, sha1))
                usage(diff_cache_usage);
-       argv++;
-       argc--;
 
        /* The rest is for paths restriction. */
-
        diff_setup(reverse_diff);
 
        mark_merge_entries();
 
-       tree = read_object_with_reference(tree_sha1, "tree", &size, NULL);
+       tree = read_object_with_reference(sha1, "tree", &size, NULL);
        if (!tree)
-               die("bad tree object %s", argv[1]);
+               die("bad tree object %s", tree_name);
        if (read_tree(tree, size, 1))
-               die("unable to read tree object %s", argv[1]);
+               die("unable to read tree object %s", tree_name);
 
        ret = diff_cache(active_cache, active_nr);
        if (detect_rename)
                diffcore_rename(detect_rename, diff_score_opt);
        if (pickaxe)
                diffcore_pickaxe(pickaxe);
-       if (2 <= argc)
-               diffcore_pathspec(argv + 1);
+       if (pathspec)
+               diffcore_pathspec(pathspec);
        diff_flush(diff_output_format, 1);
        return ret;
 }