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[PATCHv2 16/20] diff.c: convert diff_flush to use emit_line_*

In a later patch, I want to propose an option to detect&color
moved lines in a diff, which cannot be done in a one-pass over
the diff. Instead we need to go over the whole diff twice,
because we cannot detect the first line of the two corresponding
lines (+ and -) that got moved.

So to prepare the diff machinery for two pass algorithms
(i.e. buffer it all up and then operate on the result),
move all emissions to places, such that the only emitting
function is emit_line_0.

This covers diff_flush.

Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
 diff.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/diff.c b/diff.c
index f1cb0b7799..4cd1b3c520 100644
--- a/diff.c
+++ b/diff.c
@@ -4868,7 +4868,9 @@ void diff_flush(struct diff_options *options)
 			emit_line(options, NULL, NULL, 1, 0, term, !!term[0]);
 			if (options->stat_sep) {
 				/* attach patch instead of inline */
-				fputs(options->stat_sep, options->file);
+				emit_line(options, NULL, NULL, 0, 0,
+					  options->stat_sep,
+					  strlen(options->stat_sep));