- }
- if (cmp > 0) {
- show_file("+", tree2, size2, base);
- return 1;
- }
- if (!find_copies_harder && !memcmp(sha1, sha2, 20) && mode1 == mode2)
- return 0;
-
- /*
- * If the filemode has changed to/from a directory from/to a regular
- * file, we need to consider it a remove and an add.
- */
- if (S_ISDIR(mode1) != S_ISDIR(mode2)) {
- show_file("-", tree1, size1, base);
- show_file("+", tree2, size2, base);
- return 0;
- }
-
- if (recursive && S_ISDIR(mode1)) {
- int retval;
- char *newbase = malloc_base(base, path1, pathlen1);
- if (show_tree_entry_in_recursive)
- diff_change(mode1, mode2, sha1, sha2, base, path1);
- retval = diff_tree_sha1(sha1, sha2, newbase);
- free(newbase);
- return retval;
- }
-
- diff_change(mode1, mode2, sha1, sha2, base, path1);
- return 0;
-}
-
-static int interesting(void *tree, unsigned long size, const char *base)
-{
- const char *path;
- unsigned mode;
- int i;
- int baselen, pathlen;
-
- if (!nr_paths)
- return 1;
-
- (void)extract(tree, size, &path, &mode);
-
- pathlen = strlen(path);
- baselen = strlen(base);
-
- for (i=0; i < nr_paths; i++) {
- const char *match = paths[i];
- int matchlen = pathlens[i];
-
- if (baselen >= matchlen) {
- /* If it doesn't match, move along... */
- if (strncmp(base, match, matchlen))
- continue;
-
- /* The base is a subdirectory of a path which was specified. */
- return 1;
- }
-
- /* Does the base match? */
- if (strncmp(base, match, baselen))
- continue;
-
- match += baselen;
- matchlen -= baselen;
-
- if (pathlen > matchlen)
- continue;
-
- if (matchlen > pathlen) {
- if (match[pathlen] != '/')
- continue;
- if (!S_ISDIR(mode))
- continue;
- }
-
- if (strncmp(path, match, pathlen))
- continue;
-
- return 1;
- }
- return 0; /* No matches */
-}
-
-/* A whole sub-tree went away or appeared */
-static void show_tree(const char *prefix, void *tree, unsigned long size, const char *base)
-{
- while (size) {
- if (interesting(tree, size, base))
- show_file(prefix, tree, size, base);
- update_tree_entry(&tree, &size);
- }
-}
-
-static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *base)
-{
- while (size1 | size2) {
- if (nr_paths && size1 && !interesting(tree1, size1, base)) {
- update_tree_entry(&tree1, &size1);
- continue;
- }
- if (nr_paths && size2 && !interesting(tree2, size2, base)) {
- update_tree_entry(&tree2, &size2);
- continue;
- }
- if (!size1) {
- show_file("+", tree2, size2, base);
- update_tree_entry(&tree2, &size2);
- continue;
- }
- if (!size2) {
- show_file("-", tree1, size1, base);
- update_tree_entry(&tree1, &size1);
- continue;
- }
- switch (compare_tree_entry(tree1, size1, tree2, size2, base)) {
- case -1:
- update_tree_entry(&tree1, &size1);
- continue;
- case 0:
- update_tree_entry(&tree1, &size1);
- /* Fallthrough */
- case 1:
- update_tree_entry(&tree2, &size2);
- continue;
- }
- die("git-diff-tree: internal error");
- }
- return 0;
-}
-
-static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base)
-{
- void *tree1, *tree2;
- unsigned long size1, size2;
- 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(NULL,
- detect_rename, diff_score_opt,
- pickaxe, pickaxe_opts,
- diff_break_opt,
- orderfile,
- diff_filter);
- if (diff_queue_is_empty()) {
- diff_flush(DIFF_FORMAT_NO_OUTPUT, diff_line_termination);
- return 0;
- }
- if (header) {
- printf("%s%c", header, diff_line_termination);
- header = NULL;
- }
- diff_flush(diff_output_format, diff_line_termination);
- 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 const char *generate_header(const char *commit, const char *parent, const char *msg, unsigned long len)
-{
- static char this_header[16384];
- int offset;
-
- if (!verbose_header)
- return commit;
-
- offset = sprintf(this_header, "%s%s (from %s)\n", header_prefix, commit, parent);
- offset += pretty_print_commit(commit_format, msg, len, this_header + offset, sizeof(this_header) - offset);
- 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;