From d2eb80935a4e93cd775b5e8dc3f07fa1cd21d330 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Fri, 2 Nov 2018 02:39:40 -0400 Subject: [PATCH] range-diff: use a hunk callback When we count the lines in a diff, we don't actually care about the contents of each line. By using a hunk callback, we tell xdiff that it does not need to even bother generating a hunk header line, saving a small amount of work. Arguably we could even ignore the hunk headers completely, since we're just computing a cost function between patches. But doing it this way maintains the exact same behavior before and after. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- range-diff.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/range-diff.c b/range-diff.c index 0f4ce140dc..2ef372bbac 100644 --- a/range-diff.c +++ b/range-diff.c @@ -177,6 +177,12 @@ static void diffsize_consume(void *data, char *line, unsigned long len) (*(int *)data)++; } +static void diffsize_hunk(void *data, long ob, long on, long nb, long nn, + const char *funcline, long funclen) +{ + diffsize_consume(data, NULL, 0); +} + static int diffsize(const char *a, const char *b) { xpparam_t pp = { 0 }; @@ -190,7 +196,9 @@ static int diffsize(const char *a, const char *b) mf2.size = strlen(b); cfg.ctxlen = 3; - if (!xdi_diff_outf(&mf1, &mf2, NULL, diffsize_consume, &count, &pp, &cfg)) + if (!xdi_diff_outf(&mf1, &mf2, + diffsize_hunk, diffsize_consume, &count, + &pp, &cfg)) return count; error(_("failed to generate diff"));