diff: avoid generating unused hunk header lines
Some callers of xdi_diff_outf() do not look at the generated hunk header
lines at all. By plugging in a no-op hunk callback, this tells xdiff not
to even bother formatting them.
This patch introduces a stock no-op callback and uses it with a few
callers whose line callbacks explicitly ignore hunk headers (because
they look only for +/- lines).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/xdiff-interface.c b/xdiff-interface.c
index eb9c05a..b99a578 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -157,6 +157,12 @@ int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t co
return xdl_diff(&a, &b, xpp, xecfg, xecb);
}
+void discard_hunk_line(void *priv,
+ long ob, long on, long nb, long nn,
+ const char *func, long funclen)
+{
+}
+
int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2,
xdiff_emit_hunk_fn hunk_fn,
xdiff_emit_line_fn line_fn,
