only textconv regular files

We treat symlinks as text containing the results of the
symlink, so it doesn't make much sense to text-convert them.

Similarly gitlink components just end up as the text
"Subproject commit $sha1", which we should leave intact.

Note that a typechange may be broken into two parts: the
removal of the old part and the addition of the new. In that
case, we _do_ show the textconv for any part which is the
addition or removal of a file we would ordinarily textconv,
since it is purely acting on the file contents.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/diff.c b/diff.c
index 608223a..23d454e 100644
--- a/diff.c
+++ b/diff.c
@@ -1311,6 +1311,8 @@ static const char *get_textconv(struct diff_filespec *one)
 {
 	if (!DIFF_FILE_VALID(one))
 		return NULL;
+	if (!S_ISREG(one->mode))
+		return NULL;
 	diff_filespec_load_driver(one);
 	return one->driver->textconv;
 }