Introduce git_revert to revert a single commit

1 files changed, 29 insertions, 0 deletions

diff --git a/src/commit.c b/src/commit.c
index 91b60bbb2..bbb76f350 100644
--- a/src/commit.c
+++ b/src/commit.c
@@ -31,6 +31,7 @@ void git_commit__free(void *_commit)
 	git__free(commit->raw_header);
 	git__free(commit->raw_message);
 	git__free(commit->message_encoding);
+	git__free(commit->summary);
 
 	git__free(commit);
 }
@@ -286,6 +287,34 @@ const char *git_commit_message(const git_commit *commit)
 	return message;
 }
 
+const char *git_commit_summary(git_commit *commit)
+{
+	git_buf summary = GIT_BUF_INIT;
+	const char *msg, *space;
+
+	assert(commit);
+
+	if (!commit->summary) {
+		for (msg = git_commit_message(commit), space = NULL; *msg; ++msg) {
+			if (msg[0] == '\n' && (!msg[1] || msg[1] == '\n'))
+				break;
+			else if (msg[0] == '\n')
+				git_buf_putc(&summary, ' ');
+			else if (git__isspace(msg[0]))
+				space = space ? space : msg;
+			else if (space) {
+				git_buf_put(&summary, space, (msg - space) + 1);
+				space = NULL;
+			} else
+				git_buf_putc(&summary, *msg);
+		}
+
+		commit->summary = git_buf_detach(&summary);
+	}
+
+	return commit->summary;
+}
+
 int git_commit_tree(git_tree **tree_out, const git_commit *commit)
 {
 	assert(commit);