[PATCHv2 14/25] diff.c: emit_diff_symbol learns DIFF_SYMBOL_REWRITE_DIFF

[Stefan Beller]

Signed-off-by: Stefan Beller <sbel...@google.com>
---
 diff.c | 35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/diff.c b/diff.c
index 78cf5ad691..0314d57647 100644
--- a/diff.c
+++ b/diff.c
@@ -560,6 +560,7 @@ static void emit_line(struct diff_options *o, const char 
*set, const char *reset
 }
 
 enum diff_symbol {
+       DIFF_SYMBOL_REWRITE_DIFF,
        DIFF_SYMBOL_BINARY_FILES,
        DIFF_SYMBOL_HEADER,
        DIFF_SYMBOL_FILEPAIR_PLUS,
@@ -614,7 +615,7 @@ static void emit_diff_symbol(struct diff_options *o, enum 
diff_symbol s,
                             const char *line, int len, unsigned flags)
 {
        static const char *nneof = " No newline at end of file\n";
-       const char *context, *reset, *set, *meta;
+       const char *context, *reset, *set, *meta, *fraginfo;
        switch (s) {
        case DIFF_SYMBOL_NO_LF_EOF:
                context = diff_get_color_opt(o, DIFF_CONTEXT);
@@ -694,6 +695,11 @@ static void emit_diff_symbol(struct diff_options *o, enum 
diff_symbol s,
        case DIFF_SYMBOL_HEADER:
                fprintf(o->file, "%s", line);
                break;
+       case DIFF_SYMBOL_REWRITE_DIFF:
+               fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
+               reset = diff_get_color_opt(o, DIFF_RESET);
+               emit_line(o, fraginfo, reset, line, len);
+               break;
        default:
                die("BUG: unknown diff symbol");
        }
@@ -816,17 +822,17 @@ static void remove_tempfile(void)
        }
 }
 
-static void print_line_count(FILE *file, int count)
+static void add_line_count(struct strbuf *out, int count)
 {
        switch (count) {
        case 0:
-               fprintf(file, "0,0");
+               strbuf_addstr(out, "0,0");
                break;
        case 1:
-               fprintf(file, "1");
+               strbuf_addstr(out, "1");
                break;
        default:
-               fprintf(file, "1,%d", count);
+               strbuf_addf(out, "1,%d", count);
                break;
        }
 }
@@ -865,14 +871,12 @@ static void emit_rewrite_diff(const char *name_a,
                              struct diff_options *o)
 {
        int lc_a, lc_b;
-       const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
-       const char *reset = diff_get_color(o->use_color, DIFF_RESET);
        static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
        const char *a_prefix, *b_prefix;
        char *data_one, *data_two;
        size_t size_one, size_two;
        struct emit_callback ecbdata;
-       const char *line_prefix = diff_line_prefix(o);
+       struct strbuf out = STRBUF_INIT;
 
        if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
                a_prefix = o->b_prefix;
@@ -916,14 +920,17 @@ static void emit_rewrite_diff(const char *name_a,
        emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
                         b_name.buf, b_name.len, 0);
 
-       fprintf(o->file, "%s%s@@ -", line_prefix, fraginfo);
+       strbuf_addstr(&out, "@@ -");
        if (!o->irreversible_delete)
-               print_line_count(o->file, lc_a);
+               add_line_count(&out, lc_a);
        else
-               fprintf(o->file, "?,?");
-       fprintf(o->file, " +");
-       print_line_count(o->file, lc_b);
-       fprintf(o->file, " @@%s\n", reset);
+               strbuf_addstr(&out, "?,?");
+       strbuf_addstr(&out, " +");
+       add_line_count(&out, lc_b);
+       strbuf_addstr(&out, " @@\n");
+       emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
+       strbuf_release(&out);
+
        if (lc_a && !o->irreversible_delete)
                emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
        if (lc_b)
-- 
2.12.2.575.gb14f27f917