handle parentheses inside of links

inline.go

@@ -319,13 +319,25 @@ func link(p *Markdown, data []byte, offset int) (int, *Node) {
 		linkB := i
 
 		// look for link end: ' " )
+		brace := 0
 	findlinkend:
 		for i < len(data) {
 			switch {
 			case data[i] == '\\':
 				i += 2
 
-			case data[i] == ')' || data[i] == '\'' || data[i] == '"':
+			case data[i] == '(':
+				brace++
+				i++
+
+			case data[i] == ')':
+				if brace <= 0 {
+					break findlinkend
+				}
+				i++
+				brace--
+
+			case data[i] == '\'' || data[i] == '"':
 				break findlinkend
 
 			default:

inline_test.go

@@ -466,6 +466,19 @@ func TestInlineLink(t *testing.T) {
 
 		"[link](<../>)\n",
 		"<p><a href=\"../\">link</a></p>\n",
+
+		"![](http://www.broadgate.co.uk/Content/Upload/DetailImages/Cyclus700(1).jpg)",
+		"<p><img src=\"http://www.broadgate.co.uk/Content/Upload/DetailImages/Cyclus700(1).jpg\" alt=\"\" /></p>\n",
+
+		// no closing ), autolinking detects the url next
+		"[disambiguation](http://en.wikipedia.org/wiki/Disambiguation_(disambiguation) is the",
+		"<p>[disambiguation](<a href=\"http://en.wikipedia.org/wiki/Disambiguation_(disambiguation\">http://en.wikipedia.org/wiki/Disambiguation_(disambiguation</a>) is the</p>\n",
+
+		"[disambiguation](http://en.wikipedia.org/wiki/Disambiguation_(disambiguation)) is the",
+		"<p><a href=\"http://en.wikipedia.org/wiki/Disambiguation_(disambiguation)\">disambiguation</a> is the</p>\n",
+
+		"[disambiguation](http://en.wikipedia.org/wiki/Disambiguation_(disambiguation))",
+		"<p><a href=\"http://en.wikipedia.org/wiki/Disambiguation_(disambiguation)\">disambiguation</a></p>\n",
 	}
 	doLinkTestsInline(t, tests)