Build the tree line gutter in one buffer

The line-number gutter did one allocation and one write per line.

1 file changed, 5 insertions, 2 deletions

diff --git a/source/ui-tree.c b/source/ui-tree.c
index f820f1f..8bb71eb 100644
--- a/source/ui-tree.c
+++ b/source/ui-tree.c
@@ -41,12 +41,15 @@ static void print_text_buffer(const char *name, char *buf, unsigned long size)
 		lineno = 0;
 
 		if (size) {
-			htmlf(numberfmt, ++lineno);
+			struct strbuf sb = STRBUF_INIT;
+			strbuf_addf(&sb, numberfmt, ++lineno);
 			while (idx < size - 1) { // skip absolute last newline
 				if (buf[idx] == '\n')
-					htmlf(numberfmt, ++lineno);
+					strbuf_addf(&sb, numberfmt, ++lineno);
 				idx++;
 			}
+			html(sb.buf);
+			strbuf_release(&sb);
 		}
 		html("</pre></td>\n");
 	}