repository: add a getter and remove function for git's prepared message

The 'git revert/cherry-pick/merge -n' commands leave .git/MERGE_MSG
behind so that git-commit can find it. As we don't yet support these
operations, users who are shelling out to let git perform these
operations haven't had a convenient way to get this message.

These functions allow the user to retrieve the message and remove it
when she's created the commit.

1 files changed, 47 insertions, 0 deletions

diff --git a/tests-clar/repo/message.c b/tests-clar/repo/message.c
new file mode 100644
index 000000000..4a6f13b9d
--- /dev/null
+++ b/tests-clar/repo/message.c
@@ -0,0 +1,47 @@
+#include "clar_libgit2.h"
+#include "buffer.h"
+#include "refs.h"
+#include "posix.h"
+
+static git_repository *_repo;
+static git_buf _path;
+static char *_actual;
+
+void test_repo_message__initialize(void)
+{
+        _repo = cl_git_sandbox_init("testrepo.git");
+}
+
+void test_repo_message__cleanup(void)
+{
+        cl_git_sandbox_cleanup();
+	git_buf_free(&_path);
+	git__free(_actual);
+	_actual = NULL;
+}
+
+void test_repo_message__none(void)
+{
+	cl_assert_equal_i(GIT_ENOTFOUND, git_repository_message(NULL, 0, _repo));
+}
+
+void test_repo_message__message(void)
+{
+	const char expected[] = "Test\n\nThis is a test of the emergency broadcast system\n";
+	ssize_t len;
+
+	cl_git_pass(git_buf_joinpath(&_path, git_repository_path(_repo), "MERGE_MSG"));
+        cl_git_mkfile(git_buf_cstr(&_path), expected);
+
+        len = git_repository_message(NULL, 0, _repo);
+        cl_assert(len > 0);
+        _actual = git__malloc(len + 1);
+        cl_assert(_actual != NULL);
+
+        cl_assert(git_repository_message(_actual, len, _repo) > 0);
+        _actual[len] = '\0';
+        cl_assert_equal_s(expected, _actual);
+
+	cl_git_pass(p_unlink(git_buf_cstr(&_path)));
+	cl_assert_equal_i(GIT_ENOTFOUND, git_repository_message(NULL, 0, _repo));
+}