Fixed side-by-side diff bugs related to binary diff and more.

The fixed bugs:

 * "Binary files differ" did not show up either in unidiff or
   side-by-side-diff.
 * Subproject diffs did not work for side-by-side diffs.
 * The ssdiff link on diff pages did not conserve the path.

Signed-off-by: Ragnar Ouchterlony <ragnar@lysator.liu.se>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

ui-diff.c

@@ -253,11 +253,11 @@ static void print_ssdiff_link()
 	if (!strcmp(ctx.qry.page, "diff")) {
 		if (use_ssdiff)
 			cgit_diff_link("Unidiff", NULL, NULL, ctx.qry.head,
-				       ctx.qry.sha1, ctx.qry.sha2, NULL, 1);
+				       ctx.qry.sha1, ctx.qry.sha2, ctx.qry.path, 1);
 		else
 			cgit_diff_link("Side-by-side diff", NULL, NULL,
 				       ctx.qry.head, ctx.qry.sha1,
-				       ctx.qry.sha2, NULL, 1);
+				       ctx.qry.sha2, ctx.qry.path, 1);
 	}
 }
 
@@ -281,13 +281,19 @@ static void filepair_cb(struct diff_filepair *pair)
 			print_line_fn(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 		if (S_ISGITLINK(pair->two->mode))
 			print_line_fn(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
+		if (use_ssdiff)
+			cgit_ssdiff_footer();
 		return;
 	}
 	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
 			    &new_size, &binary, print_line_fn))
 		cgit_print_error("Error running diff");
-	if (binary)
-		print_line_fn(" Binary files differ", 20);
+	if (binary) {
+		if (use_ssdiff)
+			html("<tr><td colspan='4'>Binary files differ</td></tr>");
+		else
+			html("Binary files differ");
+	}
 	if (use_ssdiff)
 		cgit_ssdiff_footer();
 }

ui-ssdiff.c

@@ -108,6 +108,8 @@ static void print_ssdiff_line(char *class, int old_line_no, char *old_line,
 	if (old_line_no > 0)
 		htmlf("<td class='lineno'>%d</td><td class='%s'>",
 		      old_line_no, class);
+	else if (old_line)
+		htmlf("<td class='lineno'></td><td class='%s'>", class);
 	else
 		htmlf("<td class='lineno'></td><td class='%s_dark'>", class);
 
@@ -122,6 +124,8 @@ static void print_ssdiff_line(char *class, int old_line_no, char *old_line,
 	if (new_line_no > 0)
 		htmlf("<td class='lineno'>%d</td><td class='%s'>",
 		      new_line_no, class);
+	else if (new_line)
+		htmlf("<td class='lineno'></td><td class='%s'>", class);
 	else
 		htmlf("<td class='lineno'></td><td class='%s_dark'>", class);
 
@@ -251,8 +255,8 @@ void cgit_ssdiff_line_cb(char *line, int len)
 
 void cgit_ssdiff_header_begin()
 {
-	current_old_line = 0;
-	current_new_line = 0;
+	current_old_line = -1;
+	current_new_line = -1;
 	html("<tr><td class='space' colspan='4'><div></div></td></tr>");
 	html("<tr><td class='head' colspan='4'>");
 }