[PATCH] Simplify building of programs

[git.git] / diff-tree.c

diff --git a/diff-tree.c b/diff-tree.c
index 65bb9d6..0f37092 100644 (file)
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -164,14 +164,13 @@ static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, co
 {
        void *tree1, *tree2;
        unsigned long size1, size2;
-       char type[20];
        int retval;
 
-       tree1 = read_sha1_file(old, type, &size1);
-       if (!tree1 || strcmp(type, "tree"))
+       tree1 = read_tree_with_tree_or_commit_sha1(old, &size1, 0);
+       if (!tree1)
                die("unable to read source tree (%s)", sha1_to_hex(old));
-       tree2 = read_sha1_file(new, type, &size2);
-       if (!tree2 || strcmp(type, "tree"))
+       tree2 = read_tree_with_tree_or_commit_sha1(new, &size2, 0);
+       if (!tree2)
                die("unable to read destination tree (%s)", sha1_to_hex(new));
        retval = diff_tree(tree1, size1, tree2, size2, base);
        free(tree1);
@@ -179,19 +178,7 @@ static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, co
        return retval;
 }
 
-static void commit_to_tree(unsigned char *sha1)
-{
-       void *buf;
-       char type[20];
-       unsigned long size;
-
-       buf = read_sha1_file(sha1, type, &size);
-       if (buf) {
-               if (!strcmp(type, "commit"))
-                       get_sha1_hex(buf+5, sha1);
-               free(buf);
-       }
-}
+static char *diff_tree_usage = "diff-tree [-r] [-z] <tree sha1> <tree sha1>";
 
 int main(int argc, char **argv)
 {
@@ -209,12 +196,10 @@ int main(int argc, char **argv)
                        line_termination = '\0';
                        continue;
                }
-               usage("diff-tree [-r] [-z] <tree sha1> <tree sha1>");
+               usage(diff_tree_usage);
        }
 
        if (argc != 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new))
-               usage("diff-tree <tree sha1> <tree sha1>");
-       commit_to_tree(old);
-       commit_to_tree(new);
+               usage(diff_tree_usage);
        return diff_tree_sha1(old, new, "");
 }