X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=diff-tree.c;h=9e15b70642c543326f4a0b432258f489e1776c8a;hb=e0965d83c533e8b6a51f1c6c1be12f5edee5ca65;hp=207617c8fa247821474948cde4e34aefe4d6b5f2;hpb=73134b6d3f700bb9e6c66aa2f099de644c6b8d09;p=git.git

diff --git a/diff-tree.c b/diff-tree.c
index 207617c8..9e15b706 100644
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -1,8 +1,19 @@
+#include <ctype.h>
 #include "cache.h"
+#include "diff.h"
 
+static int ignore_merges = 1;
 static int recursive = 0;
+static int read_stdin = 0;
+static int line_termination = '\n';
+static int generate_patch = 0;
 
-static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *src, const char *dst);
+// What paths are we interested in?
+static int nr_paths = 0;
+static char **paths = NULL;
+static int *pathlens = NULL;
+
+static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base);
 
 static void update_tree_entry(void **bufp, unsigned long *sizep)
 {
@@ -11,7 +22,7 @@ static void update_tree_entry(void **bufp, unsigned long *sizep)
 	int len = strlen(buf) + 1 + 20;
 
 	if (size < len)
-		usage("corrupt tree file");
+		die("corrupt tree file");
 	*bufp = buf + len;
 	*sizep = size - len;
 }
@@ -23,25 +34,74 @@ static const unsigned char *extract(void *tree, unsigned long size, const char *
 	const char *path = strchr(tree, ' ');
 
 	if (!path || size < len + 20 || sscanf(tree, "%o", modep) != 1)
-		usage("corrupt tree file");
+		die("corrupt tree file");
 	*pathp = path+1;
 	return sha1;
 }
 
+static char *malloc_base(const char *base, const char *path, int pathlen)
+{
+	int baselen = strlen(base);
+	char *newbase = xmalloc(baselen + pathlen + 2);
+	memcpy(newbase, base, baselen);
+	memcpy(newbase + baselen, path, pathlen);
+	memcpy(newbase + baselen + pathlen, "/", 2);
+	return newbase;
+}
+
+static void show_file(const char *prefix, void *tree, unsigned long size, const char *base);
+
+/* 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) {
+		show_file(prefix, tree, size, base);
+		update_tree_entry(&tree, &size);
+	}
+}
+
+/* A file entry went away or appeared */
 static void show_file(const char *prefix, void *tree, unsigned long size, const char *base)
 {
 	unsigned mode;
 	const char *path;
 	const unsigned char *sha1 = extract(tree, size, &path, &mode);
-	printf("%s%o %s %s%s%c", prefix, mode, sha1_to_hex(sha1), base, path, 0);
+
+	if (recursive && S_ISDIR(mode)) {
+		char type[20];
+		unsigned long size;
+		char *newbase = malloc_base(base, path, strlen(path));
+		void *tree;
+
+		tree = read_sha1_file(sha1, type, &size);
+		if (!tree || strcmp(type, "tree"))
+			die("corrupt tree sha %s", sha1_to_hex(sha1));
+
+		show_tree(prefix, tree, size, newbase);
+		
+		free(tree);
+		free(newbase);
+		return;
+	}
+
+	if (generate_patch) {
+		if (!S_ISDIR(mode))
+			diff_addremove(prefix[0], mode, sha1, base, path);
+	}
+	else
+		printf("%s%06o\t%s\t%s\t%s%s%c", prefix, mode,
+		       S_ISDIR(mode) ? "tree" : "blob",
+		       sha1_to_hex(sha1), base, path,
+		       line_termination);
 }
 
-static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *src, const char *dst)
+static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *base)
 {
 	unsigned mode1, mode2;
 	const char *path1, *path2;
 	const unsigned char *sha1, *sha2;
 	int cmp, pathlen1, pathlen2;
+	char old_sha1_hex[50];
 
 	sha1 = extract(tree1, size1, &path1, &mode1);
 	sha2 = extract(tree2, size2, &path2, &mode2);
@@ -50,48 +110,116 @@ static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, uns
 	pathlen2 = strlen(path2);
 	cmp = cache_name_compare(path1, pathlen1, path2, pathlen2);
 	if (cmp < 0) {
-		show_file("-", tree1, size1, src);
+		show_file("-", tree1, size1, base);
 		return -1;
 	}
 	if (cmp > 0) {
-		show_file("+", tree2, size2, dst);
+		show_file("+", tree2, size2, base);
 		return 1;
 	}
 	if (!memcmp(sha1, sha2, 20) && mode1 == mode2)
 		return 0;
-	if (recursive && S_ISDIR(mode1) && S_ISDIR(mode2)) {
-		int srclen = strlen(src);
-		int dstlen = strlen(dst);
-		char *srcbase = malloc(srclen + pathlen1 + 2);
-		char *dstbase = malloc(srclen + pathlen1 + 2);
-		memcpy(srcbase, src, srclen);
-		memcpy(srcbase + srclen, path1, pathlen1);
-		memcpy(srcbase + srclen + pathlen1, "/", 2);
-		memcpy(dstbase, dst, dstlen);
-		memcpy(dstbase + dstlen, path2, pathlen2);
-		memcpy(dstbase + dstlen + pathlen2, "/", 2);
-		return diff_tree_sha1(sha1, sha2, srcbase, dstbase);
-	}
-
-	show_file("<", tree1, size1, src);
-	show_file(">", tree2, size2, dst);
+
+	/*
+	 * 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);
+		retval = diff_tree_sha1(sha1, sha2, newbase);
+		free(newbase);
+		return retval;
+	}
+
+	if (generate_patch) {
+		if (!S_ISDIR(mode1))
+			diff_change(mode1, mode2, sha1, sha2, base, path1);
+	}
+	else {
+		strcpy(old_sha1_hex, sha1_to_hex(sha1));
+		printf("*%06o->%06o\t%s\t%s->%s\t%s%s%c", mode1, mode2,
+		       S_ISDIR(mode1) ? "tree" : "blob",
+		       old_sha1_hex, sha1_to_hex(sha2), base, path1,
+		       line_termination);
+	}
 	return 0;
 }
 
-static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *src, const char *dst)
+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 (strncmp(path, match, pathlen))
+			continue;
+
+		return 1;
+	}
+	return 0; /* No matches */
+}
+
+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, dst);
+			show_file("+", tree2, size2, base);
 			update_tree_entry(&tree2, &size2);
 			continue;
 		}
 		if (!size2) {
-			show_file("-", tree1, size1, src);
+			show_file("-", tree1, size1, base);
 			update_tree_entry(&tree1, &size1);
 			continue;
 		}
-		switch (compare_tree_entry(tree1, size1, tree2, size2, src, dst)) {
+		switch (compare_tree_entry(tree1, size1, tree2, size2, base)) {
 		case -1:
 			update_tree_entry(&tree1, &size1);
 			continue;
@@ -102,46 +230,135 @@ static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned lon
 			update_tree_entry(&tree2, &size2);
 			continue;
 		}
-		usage("diff-tree: internal error");
+		die("diff-tree: internal error");
 	}
 	return 0;
 }
 
-static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *src, const char *dst)
+static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base)
 {
 	void *tree1, *tree2;
 	unsigned long size1, size2;
-	char type[20];
 	int retval;
 
-	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");
-	retval = diff_tree(tree1, size1, tree2, size2, src, dst);
+	tree1 = read_object_with_reference(old, "tree", &size1, 0);
+	if (!tree1)
+		die("unable to read source tree (%s)", sha1_to_hex(old));
+	tree2 = read_object_with_reference(new, "tree", &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);
 	free(tree2);
 	return retval;
 }
 
+static int diff_tree_stdin(char *line)
+{
+	int len = strlen(line);
+	unsigned char commit[20], parent[20];
+	unsigned long size, offset;
+	char *buf;
+
+	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] = ' ';
+		line[81] = 0;
+		printf("%s:\n", line);
+		return diff_tree_sha1(parent, commit, "");
+	}
+	buf = read_object_with_reference(commit, "commit", &size, NULL);
+	if (!buf)
+		return -1;
+
+	/* More than one parent? */
+	if (ignore_merges) {
+		if (!memcmp(buf + 46 + 48, "parent ", 7))
+			return 0;
+	}
+
+	line[40] = 0;
+	offset = 46;
+	while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
+		if (get_sha1_hex(buf + offset + 7, parent))
+			return -1;
+		printf("%s %s:\n", line, sha1_to_hex(parent));
+		diff_tree_sha1(parent, commit, "");
+		offset += 48;
+	}
+	return -1;
+}
+
+static char *diff_tree_usage = "diff-tree [-p] [-r] [-z] <tree sha1> <tree sha1>";
+
 int main(int argc, char **argv)
 {
+	char line[1000];
 	unsigned char old[20], new[20];
 
-	while (argc > 3) {
-		char *arg = argv[1];
+	for (;;) {
+		char *arg;
+
 		argv++;
 		argc--;
-		if (!strcmp(arg, "-R")) {
+		arg = *argv;
+		if (!arg || *arg != '-')
+			break;
+
+		if (!strcmp(arg, "-")) {
+			argv++;
+			argc--;
+			break;
+		}
+		if (!strcmp(arg, "-r")) {
 			recursive = 1;
 			continue;
 		}
-		usage("diff-tree [-R] <tree sha1> <tree sha1>");
+		if (!strcmp(arg, "-p")) {
+			recursive = generate_patch = 1;
+			continue;
+		}
+		if (!strcmp(arg, "-z")) {
+			line_termination = '\0';
+			continue;
+		}
+		if (!strcmp(arg, "-m")) {
+			ignore_merges = 0;
+			continue;
+		}
+		if (!strcmp(arg, "--stdin")) {
+			read_stdin = 1;
+			continue;
+		}
+		usage(diff_tree_usage);
+	}
+
+	if (!read_stdin) {
+		if (argc < 2 || get_sha1(argv[0], old) || get_sha1(argv[1], new))
+			usage(diff_tree_usage);
+		argv += 2;
+		argc -= 2;
+	}
+
+	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]);
 	}
 
-	if (argc != 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new))
-		usage("diff-tree <tree sha1> <tree sha1>");
-	return diff_tree_sha1(old, new, "", "");
+	if (!read_stdin)
+		return diff_tree_sha1(old, new, "");
+
+	while (fgets(line, sizeof(line), stdin))
+		diff_tree_stdin(line);
+
+	return 0;
 }