revparse: Parse range-like syntax

Signed-off-by: Greg Price <price@mit.edu>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/revparse.c b/src/revparse.c
index 884879975..7f1497130 100644
--- a/src/revparse.c
+++ b/src/revparse.c
@@ -866,3 +866,28 @@ cleanup:
 	git_buf_free(&buf);
 	return error;
 }
+
+int git_revparse_rangelike(git_object **left, git_object **right, int *threedots, git_repository *repo, const char *rangelike)
+{
+	int error = 0;
+	const char *p, *q;
+	char *revspec;
+
+	p = strstr(rangelike, "..");
+	if (!p) {
+		giterr_set(GITERR_INVALID, "Malformed range (or rangelike syntax): %s", rangelike);
+		return GIT_EINVALIDSPEC;
+	} else if (p[2] == '.') {
+		*threedots = 1;
+		q = p + 3;
+	} else {
+		*threedots = 0;
+		q = p + 2;
+	}
+
+	revspec = git__substrdup(rangelike, p - rangelike);
+	error = (git_revparse_single(left, repo, revspec)
+	      || git_revparse_single(right, repo, q));
+	git__free(revspec);
+	return error;
+}