ui-diff: add "stat only" diff type

This prints the diffstat but stops before printing (or generating) any
of the body of the diff.

No cgitrc option is added here so that we can wait to see how useful
this is before letting people set it as the default.

Suggested-by: Konstantin Ryabitsev <mricon@kernel.org>
Signed-off-by: John Keeping <john@keeping.me.uk>

2 files changed, 5 insertions, 1 deletions

diff --git a/cgit.h b/cgit.h
index 0eb5ed5..0c1585d 100644
--- a/cgit.h
+++ b/cgit.h
@@ -53,7 +53,7 @@ typedef void (*filepair_fn)(struct diff_filepair *pair);
 typedef void (*linediff_fn)(char *line, int len);
 
 typedef enum {
-	DIFF_UNIFIED, DIFF_SSDIFF
+	DIFF_UNIFIED, DIFF_SSDIFF, DIFF_STATONLY
 } diff_type;
 
 typedef enum {
diff --git a/ui-diff.c b/ui-diff.c
index a4ade4d..bf2ec57 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -349,6 +349,7 @@ void cgit_print_diff_ctrls()
 	curr = ctx.qry.has_difftype ? ctx.qry.difftype : ctx.cfg.difftype;
 	html_intoption(0, "unified", curr);
 	html_intoption(1, "ssdiff", curr);
+	html_intoption(2, "stat only", curr);
 	html("</select></td></tr>");
 	html("<tr><td/><td class='ctrl'>");
 	html("<noscript><input type='submit' value='reload'/></noscript>");
@@ -429,6 +430,9 @@ void cgit_print_diff(const char *new_rev, const char *old_rev,
 
 	cgit_print_diffstat(old_rev_sha1, new_rev_sha1, prefix);
 
+	if (difftype == DIFF_STATONLY)
+		return;
+
 	if (use_ssdiff) {
 		html("<table summary='ssdiff' class='ssdiff'>");
 	} else {