Add helper for diff line stats

This adds a `git_diff_patch_line_stats()` API that gets the total
number of adds, deletes, and context lines in a patch.  This will
make it a little easier to emulate `git diff --stat` and the like.

Right now, this relies on generating the `git_diff_patch` object,
which is a pretty heavyweight way to get stat information.  At
some future point, it would probably be nice to be able to get
this information without allocating the entire `git_diff_patch`,
but that's a much larger project.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/buffer.h b/src/buffer.h
index 4efd240b5..6e73895b4 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -134,6 +134,13 @@ GIT_INLINE(ssize_t) git_buf_rfind(git_buf *buf, char ch)
 	return idx;
 }
 
+GIT_INLINE(ssize_t) git_buf_find(git_buf *buf, char ch)
+{
+	size_t idx = 0;
+	while (idx < buf->size && buf->ptr[idx] != ch) idx++;
+	return (idx == buf->size) ? -1 : (ssize_t)idx;
+}
+
 /* Remove whitespace from the end of the buffer */
 void git_buf_rtrim(git_buf *buf);