+ int retval;
+
+ tree1 = read_object_with_reference(old, "tree", &size1, NULL);
+ if (!tree1)
+ die("unable to read source tree (%s)", sha1_to_hex(old));
+ tree2 = read_object_with_reference(new, "tree", &size2, NULL);
+ if (!tree2)
+ die("unable to read destination tree (%s)", sha1_to_hex(new));
+ retval = diff_tree(tree1, size1, tree2, size2, base);
+ free(tree1);
+ free(tree2);
+ return retval;
+}
+
+static void call_diff_setup(void)
+{
+ diff_setup(diff_setup_opt);
+}
+
+static int call_diff_flush(void)
+{
+ diffcore_std(0,
+ detect_rename, diff_score_opt,
+ pickaxe, pickaxe_opts,
+ diff_break_opt,
+ orderfile);
+ if (diff_queue_is_empty()) {
+ diff_flush(DIFF_FORMAT_NO_OUTPUT, 0);
+ return 0;
+ }
+ if (header) {
+ const char *fmt = "%s";
+ if (diff_output_format == DIFF_FORMAT_MACHINE)
+ fmt = "%s%c";
+
+ printf(fmt, header, 0);
+ header = NULL;
+ }
+ diff_flush(diff_output_format, 1);
+ return 1;
+}
+
+static int diff_tree_sha1_top(const unsigned char *old,
+ const unsigned char *new, const char *base)
+{
+ int ret;
+
+ call_diff_setup();
+ ret = diff_tree_sha1(old, new, base);
+ call_diff_flush();
+ return ret;
+}
+
+static int diff_root_tree(const unsigned char *new, const char *base)
+{
+ int retval;
+ void *tree;
+ unsigned long size;
+
+ call_diff_setup();
+ tree = read_object_with_reference(new, "tree", &size, NULL);
+ if (!tree)
+ die("unable to read root tree (%s)", sha1_to_hex(new));
+ retval = diff_tree("", 0, tree, size, base);
+ free(tree);
+ call_diff_flush();
+ return retval;
+}
+
+static char *generate_header(const char *commit, const char *parent, const char *msg, unsigned long len)
+{
+ static char this_header[16384];
+ int offset;
+
+ offset = sprintf(this_header, "%s%s (from %s)\n", header_prefix, commit, parent);
+ if (verbose_header) {
+ offset += pretty_print_commit(msg, len, this_header + offset, sizeof(this_header) - offset);
+ this_header[offset++] = '\n';
+ this_header[offset++] = 0;
+ }
+
+ return this_header;
+}
+
+static int diff_tree_commit(const unsigned char *commit, const char *name)
+{
+ unsigned long size, offset;
+ char *buf = read_object_with_reference(commit, "commit", &size, NULL);
+
+ if (!buf)
+ return -1;
+
+ if (!name) {
+ static char commit_name[60];
+ strcpy(commit_name, sha1_to_hex(commit));
+ name = commit_name;
+ }
+
+ /* Root commit? */
+ if (show_root_diff && memcmp(buf + 46, "parent ", 7)) {
+ header = generate_header(name, "root", buf, size);
+ diff_root_tree(commit, "");
+ }
+
+ /* More than one parent? */
+ if (ignore_merges) {
+ if (!memcmp(buf + 46 + 48, "parent ", 7))
+ return 0;
+ }
+
+ offset = 46;
+ while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
+ unsigned char parent[20];
+ if (get_sha1_hex(buf + offset + 7, parent))
+ return -1;
+ header = generate_header(name, sha1_to_hex(parent), buf, size);
+ diff_tree_sha1_top(parent, commit, "");
+ if (!header && verbose_header) {
+ header_prefix = "\ndiff-tree ";
+ /*
+ * Don't print multiple merge entries if we
+ * don't print the diffs.
+ */
+ }
+ offset += 48;
+ }
+ return 0;
+}
+
+static int diff_tree_stdin(char *line)
+{
+ int len = strlen(line);
+ unsigned char commit[20], parent[20];
+ static char this_header[1000];
+
+ if (!len || line[len-1] != '\n')
+ return -1;
+ line[len-1] = 0;
+ if (get_sha1_hex(line, commit))
+ return -1;
+ if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
+ line[40] = 0;
+ line[81] = 0;
+ sprintf(this_header, "%s (from %s)\n", line, line+41);
+ header = this_header;
+ return diff_tree_sha1_top(parent, commit, "");
+ }
+ line[40] = 0;
+ return diff_tree_commit(commit, line);
+}
+
+static char *diff_tree_usage =
+"git-diff-tree [-p] [-r] [-z] [--stdin] [-M] [-C] [-R] [-S<string>] [-m] [-s] [-v] [-t] <tree-ish> <tree-ish>";
+
+int main(int argc, const char **argv)
+{
+ int nr_sha1;
+ char line[1000];
+ unsigned char sha1[2][20];
+
+ nr_sha1 = 0;
+ for (;;) {
+ const char *arg;
+
+ argv++;
+ argc--;
+ arg = *argv;
+ if (!arg)
+ break;
+
+ if (*arg != '-') {
+ if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
+ nr_sha1++;
+ continue;
+ }
+ break;
+ }
+
+ if (!strcmp(arg, "--")) {
+ argv++;
+ argc--;
+ break;
+ }
+ if (!strcmp(arg, "-r")) {
+ recursive = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-t")) {
+ recursive = show_tree_entry_in_recursive = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-R")) {
+ diff_setup_opt |= DIFF_SETUP_REVERSE;
+ continue;
+ }
+ if (!strcmp(arg, "-p")) {
+ diff_output_format = DIFF_FORMAT_PATCH;
+ recursive = 1;
+ continue;
+ }
+ if (!strncmp(arg, "-S", 2)) {
+ pickaxe = arg + 2;
+ continue;
+ }
+ if (!strncmp(arg, "-O", 2)) {
+ orderfile = arg + 2;
+ continue;
+ }
+ if (!strcmp(arg, "--pickaxe-all")) {
+ pickaxe_opts = DIFF_PICKAXE_ALL;
+ continue;
+ }
+ if (!strncmp(arg, "-M", 2)) {
+ detect_rename = DIFF_DETECT_RENAME;
+ diff_score_opt = diff_scoreopt_parse(arg);
+ continue;
+ }
+ if (!strncmp(arg, "-C", 2)) {
+ detect_rename = DIFF_DETECT_COPY;
+ diff_score_opt = diff_scoreopt_parse(arg);
+ continue;
+ }
+ if (!strncmp(arg, "-B", 2)) {
+ diff_break_opt = diff_scoreopt_parse(arg);
+ continue;
+ }
+ if (!strcmp(arg, "-z")) {
+ diff_output_format = DIFF_FORMAT_MACHINE;
+ continue;
+ }
+ if (!strcmp(arg, "-m")) {
+ ignore_merges = 0;
+ continue;
+ }
+ if (!strcmp(arg, "-s")) {
+ diff_output_format = DIFF_FORMAT_NO_OUTPUT;
+ continue;
+ }
+ if (!strcmp(arg, "-v")) {
+ verbose_header = 1;
+ header_prefix = "diff-tree ";
+ continue;
+ }
+ if (!strcmp(arg, "--stdin")) {
+ read_stdin = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--root")) {
+ show_root_diff = 1;
+ continue;
+ }
+ usage(diff_tree_usage);
+ }
+
+ if (argc > 0) {
+ int i;
+
+ paths = argv;
+ nr_paths = argc;
+ pathlens = xmalloc(nr_paths * sizeof(int));
+ for (i=0; i<nr_paths; i++)
+ pathlens[i] = strlen(paths[i]);
+ }
+
+ switch (nr_sha1) {
+ case 0:
+ if (!read_stdin)
+ usage(diff_tree_usage);
+ break;
+ case 1:
+ diff_tree_commit(sha1[0], NULL);
+ break;
+ case 2:
+ diff_tree_sha1_top(sha1[0], sha1[1], "");
+ break;
+ }
+
+ if (!read_stdin)
+ return 0;
+
+ if (detect_rename)
+ diff_setup_opt |= (DIFF_SETUP_USE_SIZE_CACHE |
+ DIFF_SETUP_USE_CACHE);
+ while (fgets(line, sizeof(line), stdin))
+ diff_tree_stdin(line);
+
+ return 0;