X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=diff-tree.c;h=9d94e0cc58be314017d570f75fc3169197f46a9e;hb=dc26bd890d0a8571c38397e2ab33c0f3963c01a7;hp=acd15243435742fdeb3bbdc29c1ff7ffa27cbb2f;hpb=73848892adeaa421825672bce929b9cc16043fa9;p=git.git

diff --git a/diff-tree.c b/diff-tree.c
index acd15243..9d94e0cc 100644
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -3,12 +3,14 @@
 #include "diff.h"
 
 static int silent = 0;
+static int show_root_diff = 0;
 static int verbose_header = 0;
 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 detect_rename = 0;
 static const char *header = NULL;
 static const char *header_prefix = "";
 
@@ -54,15 +56,7 @@ static char *malloc_base(const char *base, const char *path, int pathlen)
 }
 
 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);
-	}
-}
+static void show_tree(const char *prefix, void *tree, unsigned long size, const char *base);
 
 /* A file entry went away or appeared */
 static void show_file(const char *prefix, void *tree, unsigned long size, const char *base)
@@ -209,6 +203,13 @@ static int interesting(void *tree, unsigned long size, const char *base)
 		if (pathlen > matchlen)
 			continue;
 
+		if (matchlen > pathlen) {
+			if (match[pathlen] != '/')
+				continue;
+			if (!S_ISDIR(mode))
+				continue;
+		}
+
 		if (strncmp(path, match, pathlen))
 			continue;
 
@@ -217,6 +218,16 @@ static int interesting(void *tree, unsigned long size, const char *base)
 	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) {
@@ -249,7 +260,7 @@ static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned lon
 			update_tree_entry(&tree2, &size2);
 			continue;
 		}
-		die("diff-tree: internal error");
+		die("git-diff-tree: internal error");
 	}
 	return 0;
 }
@@ -272,6 +283,36 @@ static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, co
 	return retval;
 }
 
+static int diff_tree_sha1_top(const unsigned char *old,
+			      const unsigned char *new, const char *base)
+{
+	int ret;
+	if (generate_patch)
+		diff_setup(detect_rename, 0, 0, 0, 0);
+	ret = diff_tree_sha1(old, new, base);
+	if (generate_patch)
+		diff_flush();
+	return ret;
+}
+
+static int diff_root_tree(const unsigned char *new, const char *base)
+{
+	int retval;
+	void *tree;
+	unsigned long size;
+
+	if (generate_patch)
+		diff_setup(detect_rename, 0, 0, 0, 0);
+	tree = read_object_with_reference(new, "tree", &size, 0);
+	if (!tree)
+		die("unable to read root tree (%s)", sha1_to_hex(new));
+	retval = diff_tree("", 0, tree, size, base);
+	free(tree);
+	if (generate_patch)
+		diff_flush();
+	return retval;
+}
+
 static int get_one_line(const char *msg, unsigned long len)
 {
 	int ret = 0;
@@ -350,25 +391,31 @@ static int diff_tree_commit(const unsigned char *commit, const char *name)
 	if (!buf)
 		return -1;
 
-	/* More than one parent? */
-	if (ignore_merges) {
-		if (!memcmp(buf + 46 + 48, "parent ", 7))
-			return 0;
-	}
-
 	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(parent, commit, "");
+		diff_tree_sha1_top(parent, commit, "");
 		if (!header && verbose_header)
 			header_prefix = "\ndiff-tree ";
 		offset += 48;
@@ -392,14 +439,14 @@ static int diff_tree_stdin(char *line)
 		line[81] = 0;
 		sprintf(this_header, "%s (from %s)\n", line, line+41);
 		header = this_header;
-		return diff_tree_sha1(parent, commit, "");
+		return diff_tree_sha1_top(parent, commit, "");
 	}
 	line[40] = 0;
 	return diff_tree_commit(commit, line);
 }
 
 static char *diff_tree_usage =
-"diff-tree [-p] [-r] [-z] [--stdin] [-m] [-s] [-v] <tree sha1> <tree sha1>";
+"git-diff-tree [-p] [-r] [-z] [--stdin] [-M] [-m] [-s] [-v] <tree-ish> <tree-ish>";
 
 int main(int argc, char **argv)
 {
@@ -438,6 +485,10 @@ int main(int argc, char **argv)
 			recursive = generate_patch = 1;
 			continue;
 		}
+		if (!strcmp(arg, "-M")) {
+			detect_rename = recursive = generate_patch = 1;
+			continue;
+		}
 		if (!strcmp(arg, "-z")) {
 			line_termination = '\0';
 			continue;
@@ -459,6 +510,10 @@ int main(int argc, char **argv)
 			read_stdin = 1;
 			continue;
 		}
+		if (!strcmp(arg, "--root")) {
+			show_root_diff = 1;
+			continue;
+		}
 		usage(diff_tree_usage);
 	}
 
@@ -481,7 +536,7 @@ int main(int argc, char **argv)
 		diff_tree_commit(sha1[0], NULL);
 		break;
 	case 2:
-		diff_tree_sha1(sha1[0], sha1[1], "");
+		diff_tree_sha1_top(sha1[0], sha1[1], "");
 		break;
 	}