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-rw-r--r--rev-parse.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/rev-parse.c b/rev-parse.c
new file mode 100644
index 0000000..69749f5
--- /dev/null
+++ b/rev-parse.c
@@ -0,0 +1,70 @@
+/*
+ * rev-parse.c
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ */
+#include "cache.h"
+
+int main(int argc, char **argv)
+{
+ int i, as_is = 0;
+ char *def = NULL;
+ unsigned char sha1[20];
+
+ for (i = 1; i < argc; i++) {
+ char *arg = argv[i];
+ char *dotdot;
+
+ if (as_is) {
+ printf("%s\n", arg);
+ continue;
+ }
+ if (*arg == '-') {
+ if (!strcmp(arg, "--")) {
+ if (def) {
+ printf("%s\n", def);
+ def = NULL;
+ }
+ as_is = 1;
+ }
+ if (!strcmp(arg, "--default")) {
+ if (def)
+ printf("%s\n", def);
+ def = argv[i+1];
+ i++;
+ continue;
+ }
+ printf("%s\n", arg);
+ continue;
+ }
+ def = NULL;
+ if (!get_sha1(arg, sha1)) {
+ printf("%s\n", sha1_to_hex(sha1));
+ continue;
+ }
+ if (*arg == '^' && !get_sha1(arg+1, sha1)) {
+ printf("^%s\n", sha1_to_hex(sha1));
+ continue;
+ }
+ dotdot = strstr(arg, "..");
+ if (dotdot) {
+ unsigned char end[20];
+ char *n = dotdot+2;
+ *dotdot = 0;
+ if (!get_sha1(arg, sha1)) {
+ if (!*n)
+ n = "HEAD";
+ if (!get_sha1(n, end)) {
+ printf("%s\n", sha1_to_hex(end));
+ printf("^%s\n", sha1_to_hex(sha1));
+ continue;
+ }
+ }
+ *dotdot = '.';
+ }
+ printf("%s\n", arg);
+ }
+ if (def)
+ printf("%s\n", def);
+ return 0;
+}