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[PATCH 02/19] diff: move line ending check into emit_hunk_header

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 patch moves code that is conceptually part of
emit_hunk_header, but was using output in fn_out_consume,
back to emit_hunk_header.

Meanwhile simplify it by using a function that is designed for it.

Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
 diff.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/diff.c b/diff.c
index 3f5bf8b5a4..c2ed605cd0 100644
--- a/diff.c
+++ b/diff.c
@@ -677,6 +677,8 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
 	strbuf_add(&msgbuf, line + len, org_len - len);
+	strbuf_complete_line(&msgbuf);
 	emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
@@ -1315,8 +1317,6 @@ static void fn_out_consume(void *priv, char *line, unsigned long len)
 		len = sane_truncate_line(ecbdata, line, len);
 		find_lno(line, ecbdata);
 		emit_hunk_header(ecbdata, line, len);
-		if (line[len-1] != '\n')
-			putc('\n', o->file);