Merge branch 'es/format-patch-rangediff'

"git format-patch" learned a new "--range-diff" option to explain
the difference between this version and the previous attempt in
the cover letter (or after the tree-dashes as a comment).

* es/format-patch-rangediff:
  format-patch: allow --range-diff to apply to a lone-patch
  format-patch: add --creation-factor tweak for --range-diff
  format-patch: teach --range-diff to respect -v/--reroll-count
  format-patch: extend --range-diff to accept revision range
  format-patch: add --range-diff option to embed diff in cover letter
  range-diff: relieve callers of low-level configuration burden
  range-diff: publish default creation factor
  range-diff: respect diff_option.file rather than assuming 'stdout'

1 files changed, 23 insertions, 3 deletions

diff --git a/range-diff.c b/range-diff.c
index 3e9b984401..60edb2f518 100644
--- a/range-diff.c
+++ b/range-diff.c
@@ -343,7 +343,7 @@ static void output_pair_header(struct diff_options *diffopt,
 	}
 	strbuf_addf(buf, "%s\n", color_reset);
 
-	fwrite(buf->buf, buf->len, 1, stdout);
+	fwrite(buf->buf, buf->len, 1, diffopt->file);
 }
 
 static struct userdiff_driver no_func_name = {
@@ -429,8 +429,14 @@ static void output(struct string_list *a, struct string_list *b,
 	strbuf_release(&dashes);
 }
 
+static struct strbuf *output_prefix_cb(struct diff_options *opt, void *data)
+{
+	return data;
+}
+
 int show_range_diff(const char *range1, const char *range2,
-		    int creation_factor, struct diff_options *diffopt)
+		    int creation_factor, int dual_color,
+		    struct diff_options *diffopt)
 {
 	int res = 0;
 
@@ -443,9 +449,23 @@ int show_range_diff(const char *range1, const char *range2,
 		res = error(_("could not parse log for '%s'"), range2);
 
 	if (!res) {
+		struct diff_options opts;
+		struct strbuf indent = STRBUF_INIT;
+
+		memcpy(&opts, diffopt, sizeof(opts));
+		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;
+		strbuf_addstr(&indent, "    ");
+		opts.output_prefix_data = &indent;
+		diff_setup_done(&opts);
+
 		find_exact_matches(&branch1, &branch2);
 		get_correspondences(&branch1, &branch2, creation_factor);
-		output(&branch1, &branch2, diffopt);
+		output(&branch1, &branch2, &opts);
+
+		strbuf_release(&indent);
 	}
 
 	string_list_clear(&branch1, 1);