[PATCH 07/19] diff.c: convert fn_out_consume to use emit_line_*

[Stefan Beller]

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 the parts of fn_out_consume.

Signed-off-by: Stefan Beller <sbel...@google.com>
---
 diff.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/diff.c b/diff.c
index aef159a919..93343a9ccc 100644
--- a/diff.c
+++ b/diff.c
@@ -1289,7 +1289,6 @@ static void fn_out_consume(void *priv, char *line, 
unsigned long len)
        const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
        const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
        struct diff_options *o = ecbdata->opt;
-       const char *line_prefix = diff_line_prefix(o);
 
        o->found_changes = 1;
 
@@ -1301,14 +1300,12 @@ static void fn_out_consume(void *priv, char *line, 
unsigned long len)
 
        if (ecbdata->label_path[0]) {
                const char *name_a_tab, *name_b_tab;
-
                name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
                name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
-
-               fprintf(o->file, "%s%s--- %s%s%s\n",
-                       line_prefix, meta, ecbdata->label_path[0], reset, 
name_a_tab);
-               fprintf(o->file, "%s%s+++ %s%s%s\n",
-                       line_prefix, meta, ecbdata->label_path[1], reset, 
name_b_tab);
+               emit_line_fmt(o, meta, reset, "--- %s%s\n",
+                             ecbdata->label_path[0], name_a_tab);
+               emit_line_fmt(o, meta, reset, "+++ %s%s\n",
+                             ecbdata->label_path[1], name_b_tab);
                ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
        }
 
@@ -1349,7 +1346,7 @@ static void fn_out_consume(void *priv, char *line, 
unsigned long len)
                diff_words_flush(ecbdata);
                if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
                        emit_line(o, context, reset, line, len);
-                       fputs("~\n", o->file);
+                       emit_line(o, NULL, NULL, "~\n", 2);
                } else {
                        /*
                         * Skip the prefix character, if any.  With
-- 
2.13.0.18.g183880de0a