Merge branch 'cc/maint-diff-CC-binary'

* cc/maint-diff-CC-binary:
  diff: fix "git show -C -C" output when renaming a binary file

Conflicts:
	diff.c

diff --cc diff.c
index c6b5fb376ac5ca165cb5441d2b17a6be5432f0f6,426fd046652bdfd82ec0ce399446acecb1a5ba49..2327cea5b2c9ebe8d545b5a648910077ee67cd64
--- 1/diff.c
--- 2/diff.c
+++ b/diff.c
@@@ -1890,25 -1642,28 +1891,28 @@@ static void builtin_diff(const char *na
        b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
        lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
        lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
 -      strbuf_addf(&header, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
 +      strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
        if (lbl[0][0] == '/') {
                /* /dev/null */
 -              strbuf_addf(&header, "%snew file mode %06o%s\n", set, two->mode, reset);
 -              if (xfrm_msg && xfrm_msg[0])
 -                      strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
 +              strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
 +              if (xfrm_msg)
 +                      strbuf_addstr(&header, xfrm_msg);
+               must_show_header = 1;
        }
        else if (lbl[1][0] == '/') {
 -              strbuf_addf(&header, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
 -              if (xfrm_msg && xfrm_msg[0])
 -                      strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
 +              strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
 +              if (xfrm_msg)
 +                      strbuf_addstr(&header, xfrm_msg);
+               must_show_header = 1;
        }
        else {
                if (one->mode != two->mode) {
 -                      strbuf_addf(&header, "%sold mode %06o%s\n", set, one->mode, reset);
 -                      strbuf_addf(&header, "%snew mode %06o%s\n", set, two->mode, reset);
 +                      strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
 +                      strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
+                       must_show_header = 1;
                }
 -              if (xfrm_msg && xfrm_msg[0])
 -                      strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
 +              if (xfrm_msg)
 +                      strbuf_addstr(&header, xfrm_msg);
  
                /*
                 * we do not run diff between different kind
@@@ -1928,15 -1683,19 +1932,18 @@@
                }
        }
  
 -      if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
 -              die("unable to read files to diff");
 -
        if (!DIFF_OPT_TST(o, TEXT) &&
 -          ( (diff_filespec_is_binary(one) && !textconv_one) ||
 -            (diff_filespec_is_binary(two) && !textconv_two) )) {
 +          ( (!textconv_one && diff_filespec_is_binary(one)) ||
 +            (!textconv_two && diff_filespec_is_binary(two)) )) {
 +              if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
 +                      die("unable to read files to diff");
                /* Quite common confusing case */
                if (mf1.size == mf2.size &&
-                   !memcmp(mf1.ptr, mf2.ptr, mf1.size))
+                   !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
+                       if (must_show_header)
+                               fprintf(o->file, "%s", header.buf);
                        goto free_ab_and_return;
+               }
                fprintf(o->file, "%s", header.buf);
                strbuf_reset(&header);
                if (DIFF_OPT_TST(o, BINARY))
@@@ -2568,18 -2323,9 +2575,19 @@@ static void fill_metainfo(struct strbu
                          struct diff_filespec *two,
                          struct diff_options *o,
                          struct diff_filepair *p,
 -                        int *must_show_header)
++                        int *must_show_header,
 +                        int use_color)
  {
- 
 +      const char *set = diff_get_color(use_color, DIFF_METAINFO);
 +      const char *reset = diff_get_color(use_color, DIFF_RESET);
 +      struct strbuf *msgbuf;
 +      char *line_prefix = "";
 +
+       *must_show_header = 1;
 +      if (o->output_prefix) {
 +              msgbuf = o->output_prefix(o, o->output_prefix_data);
 +              line_prefix = msgbuf->buf;
 +      }
        strbuf_init(msg, PATH_MAX * 2 + 300);
        switch (p->status) {
        case DIFF_STATUS_COPIED:
@@@ -2646,7 -2387,13 +2654,8 @@@ static void run_diff_cmd(const char *pg
  {
        const char *xfrm_msg = NULL;
        int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
+       int must_show_header = 0;
  
 -      if (msg) {
 -              fill_metainfo(msg, name, other, one, two, o, p, &must_show_header);
 -              xfrm_msg = msg->len ? msg->buf : NULL;
 -      }
 -
        if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
                pgm = NULL;
        else {
@@@ -2655,16 -2402,6 +2664,17 @@@
                        pgm = drv->external;
        }
  
 +      if (msg) {
 +              /*
 +               * don't use colors when the header is intended for an
 +               * external diff driver
 +               */
 +              fill_metainfo(msg, name, other, one, two, o, p,
++                            &must_show_header,
 +                            DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
 +              xfrm_msg = msg->len ? msg->buf : NULL;
 +      }
 +
        if (pgm) {
                run_external_diff(pgm, name, other, one, two, xfrm_msg,
                                  complete_rewrite);

diff --cc t/t4015-diff-whitespace.sh
Simple merge