Fix protocol-less urls from linkifier

Linkifier might send raw hostnames like "example.com", where url
starts with domain name. So we prepend http:// in those cases,
and remove it afterwards.

lib/rules_core/linkify.js

@@ -17,7 +17,8 @@ function isLinkClose(str) {
 
 
 module.exports = function linkify(state) {
-  var i, j, l, tokens, token, currentToken, nodes, ln, text, pos, lastPos, level, htmlLinkLevel, url, fullUrl,
+  var i, j, l, tokens, token, currentToken, nodes, ln, text, pos, lastPos,
+      level, htmlLinkLevel, url, fullUrl, urlText,
       blockTokens = state.tokens,
       links;
 
@@ -74,6 +75,20 @@ module.exports = function linkify(state) {
           fullUrl = state.md.normalizeLink(url);
           if (!state.md.validateLink(fullUrl)) { continue; }
 
+          urlText = links[ln].text;
+
+          // Linkifier might send raw hostnames like "example.com", where url
+          // starts with domain name. So we prepend http:// in those cases,
+          // and remove it afterwards.
+          //
+          if (!links[ln].schema) {
+            urlText = state.md.normalizeLinkText('http://' + urlText).replace(/^http:\/\//, '');
+          } else if (links[ln].schema === 'mailto:' && !/^mailto:/i.test(urlText)) {
+            urlText = state.md.normalizeLinkText('mailto:' + urlText).replace(/^mailto:/, '');
+          } else {
+            urlText = state.md.normalizeLinkText(urlText);
+          }
+
           pos = links[ln].index;
 
           if (pos > lastPos) {
@@ -89,7 +104,7 @@ module.exports = function linkify(state) {
           nodes.push(token);
 
           token         = new state.Token('text', '', 0);
-          token.content = state.md.normalizeLinkText(links[ln].text);
+          token.content = urlText;
           token.level   = level;
           nodes.push(token);
 

test/fixtures/markdown-it/normalize.txt

@@ -80,3 +80,21 @@ test http://☃.net/ foo
 .
 <p>test <a href="http://xn--n3h.net/">http://☃.net/</a> foo</p>
 .
+
+.
+test //xn--n3h.net/ foo
+.
+<p>test <a href="//xn--n3h.net/">//☃.net/</a> foo</p>
+.
+
+.
+test xn--n3h.net foo
+.
+<p>test <a href="http://xn--n3h.net">☃.net</a> foo</p>
+.
+
+.
+test xn--n3h@xn--n3h.net foo
+.
+<p>test <a href="mailto:xn--n3h@xn--n3h.net">xn–n3h@☃.net</a> foo</p>
+.