X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=diff-tree.c;h=acd15243435742fdeb3bbdc29c1ff7ffa27cbb2f;hb=73848892adeaa421825672bce929b9cc16043fa9;hp=24b24dcfd0551405587c7cf4238f5ccae1297cd7;hpb=b11645be0139f907488b17ca4267e593ee58dd30;p=git.git

diff --git a/diff-tree.c b/diff-tree.c
index 24b24dcf..acd15243 100644
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -356,6 +356,12 @@ static int diff_tree_commit(const unsigned char *commit, const char *name)
 			return 0;
 	}
 
+	if (!name) {
+		static char commit_name[60];
+		strcpy(commit_name, sha1_to_hex(commit));
+		name = commit_name;
+	}
+
 	offset = 46;
 	while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
 		unsigned char parent[20];
@@ -397,19 +403,29 @@ static char *diff_tree_usage =
 
 int main(int argc, char **argv)
 {
+	int nr_sha1;
 	char line[1000];
-	unsigned char old[20], new[20];
+	unsigned char sha1[2][20];
 
+	nr_sha1 = 0;
 	for (;;) {
 		char *arg;
 
 		argv++;
 		argc--;
 		arg = *argv;
-		if (!arg || *arg != '-')
+		if (!arg)
 			break;
 
-		if (!strcmp(arg, "-")) {
+		if (*arg != '-') {
+			if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
+				nr_sha1++;
+				continue;
+			}
+			break;
+		}
+
+		if (!strcmp(arg, "--")) {
 			argv++;
 			argc--;
 			break;
@@ -446,13 +462,6 @@ int main(int argc, char **argv)
 		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;
 
@@ -463,8 +472,21 @@ int main(int argc, char **argv)
 			pathlens[i] = strlen(paths[i]);
 	}
 
+	switch (nr_sha1) {
+	case 0:
+		if (!read_stdin)
+			usage(diff_tree_usage);
+		break;
+	case 1:
+		diff_tree_commit(sha1[0], NULL);
+		break;
+	case 2:
+		diff_tree_sha1(sha1[0], sha1[1], "");
+		break;
+	}
+
 	if (!read_stdin)
-		return diff_tree_sha1(old, new, "");
+		return 0;
 
 	while (fgets(line, sizeof(line), stdin))
 		diff_tree_stdin(line);