X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=diff-tree.c;h=f55a35a9d5f9ae4e3f7d3fd778a953cc9cc533ad;hb=ae64bbc18c80bdad36c53336ba4f724ce128efca;hp=2f04d1eb9d9569b18b77220398f3a340d3352bf9;hpb=9174026cfe69d73ef80b27890615f8b2ef5c265a;p=git.git

diff --git a/diff-tree.c b/diff-tree.c
index 2f04d1eb..f55a35a9 100644
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -1,109 +1,328 @@
 #include "cache.h"
+#include "diff.h"
+#include "commit.h"
 
-struct tree_entry;
+static int show_root_diff = 0;
+static int no_commit_id = 0;
+static int verbose_header = 0;
+static int ignore_merges = 1;
+static int combine_merges = 0;
+static int dense_combined_merges = 0;
+static int read_stdin = 0;
+static int always_show_header = 0;
 
-static struct tree_entry *update_tree_entry(void **bufp, unsigned long *sizep)
+static const char *header = NULL;
+static const char *header_prefix = "";
+static enum cmit_fmt commit_format = CMIT_FMT_RAW;
+
+static struct diff_options diff_options;
+
+static int call_diff_flush(void)
 {
-	void *buf = *bufp;
-	unsigned long size = *sizep;
-	int len = strlen(buf) + 1 + 20;
-
-	if (size < len)
-		usage("corrupt tree file");
-	*bufp = buf + len;
-	*sizep = size - len;
-	return buf;
+	diffcore_std(&diff_options);
+	if (diff_queue_is_empty()) {
+		int saved_fmt = diff_options.output_format;
+		diff_options.output_format = DIFF_FORMAT_NO_OUTPUT;
+		diff_flush(&diff_options);
+		diff_options.output_format = saved_fmt;
+		return 0;
+	}
+	if (header) {
+		if (!no_commit_id)
+			printf("%s%c", header, diff_options.line_termination);
+		header = NULL;
+	}
+	diff_flush(&diff_options);
+	return 1;
 }
 
-static const unsigned char *extract(void *tree, unsigned long size, const char **pathp, unsigned int *modep)
+static int diff_tree_sha1_top(const unsigned char *old,
+			      const unsigned char *new, const char *base)
 {
-	int len = strlen(tree)+1;
-	const unsigned char *sha1 = tree + len;
-	const char *path = strchr(tree, ' ');
-
-	if (!path || size < len + 20 || sscanf(tree, "%o", modep) != 1)
-		usage("corrupt tree file");
-	*pathp = path+1;
-	return sha1;
+	int ret;
+
+	ret = diff_tree_sha1(old, new, base, &diff_options);
+	call_diff_flush();
+	return ret;
 }
 
-static void show_file(const char *prefix, void *tree, unsigned long size)
+static int diff_root_tree(const unsigned char *new, const char *base)
 {
-	unsigned mode;
-	const char *path;
-	const unsigned char *sha1 = extract(tree, size, &path, &mode);
-	printf("%s%o %s %s%c", prefix, mode, sha1_to_hex(sha1), path, 0);
+	int retval;
+	void *tree;
+	struct tree_desc empty, real;
+
+	tree = read_object_with_reference(new, "tree", &real.size, NULL);
+	if (!tree)
+		die("unable to read root tree (%s)", sha1_to_hex(new));
+	real.buf = tree;
+
+	empty.buf = "";
+	empty.size = 0;
+	retval = diff_tree(&empty, &real, base, &diff_options);
+	free(tree);
+	call_diff_flush();
+	return retval;
 }
 
-static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2)
+static const char *generate_header(const unsigned char *commit_sha1,
+				   const unsigned char *parent_sha1,
+				   const struct commit *commit)
 {
-	unsigned mode1, mode2;
-	const char *path1, *path2;
-	const unsigned char *sha1, *sha2;
-	int cmp;
+	static char this_header[16384];
+	int offset;
+	unsigned long len;
+	int abbrev = diff_options.abbrev;
+	const char *msg = commit->buffer;
 
-	sha1 = extract(tree1, size1, &path1, &mode1);
-	sha2 = extract(tree2, size2, &path2, &mode2);
+	if (!verbose_header)
+		return sha1_to_hex(commit_sha1);
 
-	cmp = cache_name_compare(path1, strlen(path1), path2, strlen(path2));
-	if (cmp < 0) {
-		show_file("-", tree1, size1);
-		return -1;
+	len = strlen(msg);
+
+	offset = sprintf(this_header, "%s%s ",
+			 header_prefix,
+			 diff_unique_abbrev(commit_sha1, abbrev));
+	if (commit_sha1 != parent_sha1)
+		offset += sprintf(this_header + offset, "(from %s)\n",
+				  parent_sha1
+				  ? diff_unique_abbrev(parent_sha1, abbrev)
+				  : "root");
+	else
+		offset += sprintf(this_header + offset, "(from parents)\n");
+	offset += pretty_print_commit(commit_format, commit, len,
+				      this_header + offset,
+				      sizeof(this_header) - offset, abbrev);
+	if (always_show_header) {
+		puts(this_header);
+		return NULL;
 	}
-	if (cmp > 0) {
-		show_file("+", tree2, size2);
-		return 1;
+	return this_header;
+}
+
+static int diff_tree_commit(struct commit *commit)
+{
+	struct commit_list *parents;
+	unsigned const char *sha1 = commit->object.sha1;
+
+	/* Root commit? */
+	if (show_root_diff && !commit->parents) {
+		header = generate_header(sha1, NULL, commit);
+		diff_root_tree(sha1, "");
+	}
+
+	/* More than one parent? */
+	if (commit->parents && commit->parents->next) {
+		if (ignore_merges)
+			return 0;
+		else if (combine_merges) {
+			header = generate_header(sha1, sha1, commit);
+			header = diff_tree_combined_merge(sha1, header,
+							dense_combined_merges,
+							&diff_options);
+			if (!header && verbose_header)
+				header_prefix = "\ndiff-tree ";
+			return 0;
+		}
+	}
+
+	for (parents = commit->parents; parents; parents = parents->next) {
+		struct commit *parent = parents->item;
+		header = generate_header(sha1, parent->object.sha1, commit);
+		diff_tree_sha1_top(parent->object.sha1, sha1, "");
+		if (!header && verbose_header) {
+			header_prefix = "\ndiff-tree ";
+			/*
+			 * Don't print multiple merge entries if we
+			 * don't print the diffs.
+			 */
+		}
 	}
-	if (!memcmp(sha1, sha2, 20) && mode1 == mode2)
-		return 0;
-	show_file("<", tree1, size1);
-	show_file(">", tree2, size2);
 	return 0;
 }
 
-static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2)
+static int diff_tree_commit_sha1(const unsigned char *sha1)
+{
+	struct commit *commit = lookup_commit_reference(sha1);
+	if (!commit)
+		return -1;
+	return diff_tree_commit(commit);
+}
+
+static int diff_tree_stdin(char *line)
 {
-	while (size1 | size2) {
-		if (!size1) {
-			show_file("+", tree2, size2);
-			update_tree_entry(&tree2, &size2);
+	int len = strlen(line);
+	unsigned char sha1[20];
+	struct commit *commit;
+
+	if (!len || line[len-1] != '\n')
+		return -1;
+	line[len-1] = 0;
+	if (get_sha1_hex(line, sha1))
+		return -1;
+	commit = lookup_commit(sha1);
+	if (!commit || parse_commit(commit))
+		return -1;
+	if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
+		/* Graft the fake parents locally to the commit */
+		int pos = 41;
+		struct commit_list **pptr, *parents;
+
+		/* Free the real parent list */
+		for (parents = commit->parents; parents; ) {
+			struct commit_list *tmp = parents->next;
+			free(parents);
+			parents = tmp;
+		}
+		commit->parents = NULL;
+		pptr = &(commit->parents);
+		while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
+			struct commit *parent = lookup_commit(sha1);
+			if (parent) {
+				pptr = &commit_list_insert(parent, pptr)->next;
+			}
+			pos += 41;
+		}
+	}
+	return diff_tree_commit(commit);
+}
+
+static const char diff_tree_usage[] =
+"git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
+"[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
+"  -r            diff recursively\n"
+"  --root        include the initial commit as diff against /dev/null\n"
+COMMON_DIFF_OPTIONS_HELP;
+
+int main(int argc, const char **argv)
+{
+	int nr_sha1;
+	char line[1000];
+	unsigned char sha1[2][20];
+	const char *prefix = setup_git_directory();
+
+	git_config(git_diff_config);
+	nr_sha1 = 0;
+	diff_setup(&diff_options);
+
+	for (;;) {
+		int diff_opt_cnt;
+		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;
+		}
+
+		diff_opt_cnt = diff_opt_parse(&diff_options, argv, argc);
+		if (diff_opt_cnt < 0)
+			usage(diff_tree_usage);
+		else if (diff_opt_cnt) {
+			argv += diff_opt_cnt - 1;
+			argc -= diff_opt_cnt - 1;
+			continue;
+		}
+
+
+		if (!strcmp(arg, "--")) {
+			argv++;
+			argc--;
+			break;
+		}
+		if (!strcmp(arg, "-r")) {
+			diff_options.recursive = 1;
+			continue;
+		}
+		if (!strcmp(arg, "-t")) {
+			diff_options.recursive = 1;
+			diff_options.tree_in_recursive = 1;
+			continue;
+		}
+		if (!strcmp(arg, "-m")) {
+			ignore_merges = 0;
+			continue;
+		}
+		if (!strcmp(arg, "-c")) {
+			combine_merges = 1;
+			continue;
+		}
+		if (!strcmp(arg, "--cc")) {
+			dense_combined_merges = combine_merges = 1;
+			continue;
+		}
+		if (!strcmp(arg, "-v")) {
+			verbose_header = 1;
+			header_prefix = "diff-tree ";
+			continue;
+		}
+		if (!strncmp(arg, "--pretty", 8)) {
+			verbose_header = 1;
+			header_prefix = "diff-tree ";
+			commit_format = get_commit_format(arg+8);
+			continue;
+		}
+		if (!strcmp(arg, "--stdin")) {
+			read_stdin = 1;
 			continue;
 		}
-		if (!size2) {
-			show_file("-", tree1, size1);
-			update_tree_entry(&tree1, &size1);
+		if (!strcmp(arg, "--root")) {
+			show_root_diff = 1;
 			continue;
 		}
-		switch (compare_tree_entry(tree1, size1, tree2, size2)) {
-		case -1:
-			update_tree_entry(&tree1, &size1);
+		if (!strcmp(arg, "--no-commit-id")) {
+			no_commit_id = 1;
 			continue;
-		case 0:
-			update_tree_entry(&tree1, &size1);
-			/* Fallthrough */
-		case 1:
-			update_tree_entry(&tree2, &size2);
+		}
+		if (!strcmp(arg, "--always")) {
+			always_show_header = 1;
 			continue;
 		}
-		usage("diff-tree: internal error");
+		usage(diff_tree_usage);
 	}
-	return 0;
-}
 
-int main(int argc, char **argv)
-{
-	unsigned char old[20], new[20];
-	void *tree1, *tree2;
-	unsigned long size1, size2;
-	char type[20];
-
-	if (argc != 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new))
-		usage("diff-tree <tree sha1> <tree sha1>");
-	tree1 = read_sha1_file(old, type, &size1);
-	if (!tree1 || strcmp(type, "tree"))
-		usage("unable to read source tree");
-	tree2 = read_sha1_file(new, type, &size2);
-	if (!tree2 || strcmp(type, "tree"))
-		usage("unable to read destination tree");
-	return diff_tree(tree1, size1, tree2, size2);
+	if (combine_merges)
+		ignore_merges = 0;
+
+	/* We can only do dense combined merges with diff output */
+	if (dense_combined_merges)
+		diff_options.output_format = DIFF_FORMAT_PATCH;
+
+	if (diff_options.output_format == DIFF_FORMAT_PATCH)
+		diff_options.recursive = 1;
+
+	diff_tree_setup_paths(get_pathspec(prefix, argv));
+	diff_setup_done(&diff_options);
+
+	switch (nr_sha1) {
+	case 0:
+		if (!read_stdin)
+			usage(diff_tree_usage);
+		break;
+	case 1:
+		diff_tree_commit_sha1(sha1[0]);
+		break;
+	case 2:
+		diff_tree_sha1_top(sha1[0], sha1[1], "");
+		break;
+	}
+
+	if (!read_stdin)
+		return 0;
+
+	if (diff_options.detect_rename)
+		diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
+				       DIFF_SETUP_USE_CACHE);
+	while (fgets(line, sizeof(line), stdin))
+		diff_tree_stdin(line);
+
+	return 0;
 }