X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=diff-tree.c;h=618fdb616cebbd2fc9f1cddc0b6b75fd575250a1;hb=86436c28289eedd2ee9b7f9c872a0ed039866a0f;hp=04eb933b00b94411f212f5ce2cb54510ce8e360e;hpb=2de381f919829aec1e35d6c7cc33519295dcd053;p=git.git

diff --git a/diff-tree.c b/diff-tree.c
index 04eb933b..618fdb61 100644
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -1,6 +1,12 @@
 #include "cache.h"
 
 static int recursive = 0;
+static int line_termination = '\n';
+
+// 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);
 
@@ -73,7 +79,10 @@ static void show_file(const char *prefix, void *tree, unsigned long size, const
 		return;
 	}
 
-	printf("%s%o %s %s%s%c", prefix, mode, sha1_to_hex(sha1), base, path, 0);
+	printf("%s%o\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 *base)
@@ -103,7 +112,7 @@ static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, uns
 
 	/*
 	 * If the filemode has changed to/from a directory from/to a regular
-	 * file, we need to consider it a remove and an add. 
+	 * file, we need to consider it a remove and an add.
 	 */
 	if (S_ISDIR(mode1) != S_ISDIR(mode2)) {
 		show_file("-", tree1, size1, base);
@@ -120,13 +129,70 @@ static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, uns
 	}
 
 	strcpy(old_sha1_hex, sha1_to_hex(sha1));
-	printf("*%o->%o %s->%s %s%s%c", mode1, mode2, old_sha1_hex, sha1_to_hex(sha2), base, path1, 0);
+	printf("*%o->%o\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 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, base);
 			update_tree_entry(&tree2, &size2);
@@ -157,14 +223,13 @@ 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);
@@ -172,22 +237,43 @@ static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, co
 	return retval;
 }
 
+static char *diff_tree_usage = "diff-tree [-r] [-z] <tree sha1> <tree sha1>";
+
 int main(int argc, char **argv)
 {
 	unsigned char old[20], new[20];
 
-	while (argc > 3) {
+	for (;;) {
 		char *arg = argv[1];
+
+		if (!arg || *arg != '-')
+			break;
+
 		argv++;
 		argc--;
 		if (!strcmp(arg, "-r")) {
 			recursive = 1;
 			continue;
 		}
-		usage("diff-tree [-R] <tree sha1> <tree sha1>");
+		if (!strcmp(arg, "-z")) {
+			line_termination = '\0';
+			continue;
+		}
+		usage(diff_tree_usage);
+	}
+
+	if (argc < 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new))
+		usage(diff_tree_usage);
+
+	if (argc > 3) {
+		int i;
+
+		paths = &argv[3];
+		nr_paths = argc - 3;
+		pathlens = malloc(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, "");
 }