Emit a whole line in one go

Since the graph prefix will be printed when calling
emit_line, so the functions should be used to emit a
complete line out once a time. No one should call
emit_line to just output some strings instead of a
complete line.
Use a strbuf to compose the whole line, and then
call emit_line to output it once.

Signed-off-by: Bo Yang <struggleyb.nku@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diff.c b/diff.c
index 7f2538d3390313719b27806b273d215ef720be00..2a1482aa9036cd033868108f7ac67ccffd2df688 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -370,6 +370,9 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
        const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
        static const char atat[2] = { '@', '@' };
        const char *cp, *ep;
+       struct strbuf msgbuf = STRBUF_INIT;
+       int org_len = len;
+       int i = 1;
 
        /*
         * As a hunk header must begin with "@@ -<old>, +<new> @@",
@@ -384,17 +387,36 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
        ep += 2; /* skip over @@ */
 
        /* The hunk header in fraginfo color */
-       emit_line(ecbdata->opt, frag, reset, line, ep - line);
+       strbuf_add(&msgbuf, frag, strlen(frag));
+       strbuf_add(&msgbuf, line, ep - line);
+       strbuf_add(&msgbuf, reset, strlen(reset));
+
+       /*
+        * trailing "\r\n"
+        */
+       for ( ; i < 3; i++)
+               if (line[len - i] == '\r' || line[len - i] == '\n')
+                       len--;
 
        /* blank before the func header */
        for (cp = ep; ep - line < len; ep++)
                if (*ep != ' ' && *ep != '\t')
                        break;
-       if (ep != cp)
-               emit_line(ecbdata->opt, plain, reset, cp, ep - cp);
+       if (ep != cp) {
+               strbuf_add(&msgbuf, plain, strlen(plain));
+               strbuf_add(&msgbuf, cp, ep - cp);
+               strbuf_add(&msgbuf, reset, strlen(reset));
+       }
+
+       if (ep < line + len) {
+               strbuf_add(&msgbuf, func, strlen(func));
+               strbuf_add(&msgbuf, ep, line + len - ep);
+               strbuf_add(&msgbuf, reset, strlen(reset));
+       }
 
-       if (ep < line + len)
-               emit_line(ecbdata->opt, func, reset, ep, line + len - ep);
+       strbuf_add(&msgbuf, line + len, org_len - len);
+       emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
+       strbuf_release(&msgbuf);
 }
 
 static struct diff_tempfile *claim_diff_tempfile(void) {