merge-options.txt: clarify meaning of various ff-related options

diff --git a/range-diff.c b/range-diff.c
index bd8083f2d10cea9a464ebfd1490295d13267421a..48b0e1b4ce0ff69b9c7a430174db25b1ca6494f8 100644 (file)
--- a/range-diff.c
+++ b/range-diff.c
@@ -197,6 +197,12 @@ static void diffsize_consume(void *data, char *line, unsigned long len)
        (*(int *)data)++;
 }
 
+static void diffsize_hunk(void *data, long ob, long on, long nb, long nn,
+                         const char *funcline, long funclen)
+{
+       diffsize_consume(data, NULL, 0);
+}
+
 static int diffsize(const char *a, const char *b)
 {
        xpparam_t pp = { 0 };
@@ -210,7 +216,9 @@ static int diffsize(const char *a, const char *b)
        mf2.size = strlen(b);
 
        cfg.ctxlen = 3;
-       if (!xdi_diff_outf(&mf1, &mf2, diffsize_consume, &count, &pp, &cfg))
+       if (!xdi_diff_outf(&mf1, &mf2,
+                          diffsize_hunk, diffsize_consume, &count,
+                          &pp, &cfg))
                return count;
 
        error(_("failed to generate diff"));
@@ -452,8 +460,13 @@ int show_range_diff(const char *range1, const char *range2,
                struct diff_options opts;
                struct strbuf indent = STRBUF_INIT;
 
-               memcpy(&opts, diffopt, sizeof(opts));
-               opts.output_format = DIFF_FORMAT_PATCH;
+               if (diffopt)
+                       memcpy(&opts, diffopt, sizeof(opts));
+               else
+                       diff_setup(&opts);
+
+               if (!opts.output_format)
+                       opts.output_format = DIFF_FORMAT_PATCH;
                opts.flags.suppress_diff_headers = 1;
                opts.flags.dual_color_diffed_diffs = dual_color;
                opts.output_prefix = output_prefix_cb;