Merge pull request #668 from nulltoken/topic/binary-blobs

Enhancing the blob diffing experience

include/git2/diff.h

@@ -337,12 +337,21 @@ GIT_EXTERN(int) git_diff_print_patch(
 
 /**
  * Directly run a text diff on two blobs.
+ *
+ * Compared to a file, a blob lacks some contextual information. As such, the
+ * `git_diff_file` parameters of the callbacks will be filled accordingly to the following:
+ * `mode` will be set to 0, `path` will be set to NULL. When dealing with a NULL blob, `oid`
+ * will be set to 0.
+ *
+ * When at least one of the blobs being dealt with is binary, the `git_diff_delta` binary
+ * attribute will be set to 1 and no call to the hunk_cb nor line_cb will be made.
  */
 GIT_EXTERN(int) git_diff_blobs(
 	git_blob *old_blob,
 	git_blob *new_blob,
 	git_diff_options *options,
 	void *cb_data,
+	git_diff_file_fn file_cb,
 	git_diff_hunk_fn hunk_cb,
 	git_diff_data_fn line_cb);