From fd9d270478964cc8d27c2eda686b66d9a31fcc35 Mon Sep 17 00:00:00 2001
From: Vitaly Puzrin <vitaly@rcdesign.ru>
Date: Thu, 9 Oct 2014 16:04:42 +0400
Subject: [PATCH] Added links autoconversion

---
 lib/typographer.js                       | 102 ++++++++++++++++++++++-
 package.json                             |   3 +-
 test/fixtures/remarkable/typographer.txt |  13 +++
 3 files changed, 114 insertions(+), 4 deletions(-)

diff --git a/lib/typographer.js b/lib/typographer.js
index a81ee1f..669f1ab 100644
--- a/lib/typographer.js
+++ b/lib/typographer.js
@@ -12,14 +12,110 @@
 // - fractionals 1/2, 1/4, 3/4 -> ½, ¼, ¾
 // - miltiplication 2 x 4 -> 2 × 4
 
-var assign   = require('./common/utils').assign;
-var defaults = require('./defaults_typographer');
-var Ruler    = require('./ruler');
+
+var Autolinker = require('autolinker');
+
+
+var assign     = require('./common/utils').assign;
+var escapeHtml = require('./helpers').escapeHtml;
+var defaults   = require('./defaults_typographer');
+var Ruler      = require('./ruler');
+
+
+var links = [];
+var autolinker = new Autolinker({
+  stripPrefix: false,
+  replaceFn: function (autolinker, match) {
+    // Only collect matched strings but don't change anything.
+    var url;
+    if (match.getType() === 'url') {
+      url = match.getUrl();
+      if (/^(http|https|ftp|git)/.test(url)) {
+        links.push(url);
+      }
+    }
+    return false;
+  }
+});
 
 
 var rules = [];
 
 
+rules.push(function linkify(t, state) {
+  var i, token, text, nodes, ln, pos, level,
+      tokens = state.tokens;
+
+  if (!t.options.linkify) { return; }
+
+  for (i = tokens.length - 1; i >= 0; i--) {
+    token = tokens[i];
+
+    // Skip content of links
+    if (token.type === 'link_close') {
+      i--;
+      while (tokens[i].type !== 'link_open' && tokens[i].level !== token.level) {
+        i--;
+      }
+      i--;
+      continue;
+    }
+
+    if (token.type === 'text' &&
+        (token.content.indexOf('://') ||
+         token.content.indexOf('www'))) {
+      text = token.content;
+      links = [];
+      autolinker.link(text);
+
+      if (!links.length) { continue; }
+
+      // Now split string to nodes
+      nodes = [];
+      level = token.level;
+
+      for (ln = 0; ln < links.length; ln++) {
+        pos = text.indexOf(links[ln]);
+        if (pos) {
+          level = level;
+          nodes.push({
+            type: 'text',
+            content: text.slice(0, pos),
+            level: level
+          });
+        }
+        nodes.push({
+          type: 'link_open',
+          href: links[ln],
+          title: '',
+          level: level++
+        });
+        nodes.push({
+          type: 'text',
+          content: escapeHtml(links[ln]),
+          level: level
+        });
+        nodes.push({
+          type: 'link_close',
+          level: --level
+        });
+        text = text.slice(pos + links[ln].length);
+      }
+      if (text.length) {
+        nodes.push({
+          type: 'text',
+          content: text,
+          level: level
+        });
+      }
+
+      // replace cuttent node
+      state.tokens = tokens = [].concat(tokens.slice(0, i), nodes, tokens.slice(i + 1));
+    }
+  }
+});
+
+
 rules.push(function single(t, state) {
   var i, token, text,
       tokens = state.tokens,
diff --git a/package.json b/package.json
index 995bca3..3bbf4c1 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,8 @@
   ],
   "main": "index.js",
   "dependencies": {
-    "argparse": "~ 0.1.15"
+    "argparse": "~ 0.1.15",
+    "autolinker": "~ 0.12.3"
   },
   "devDependencies": {
     "ansi": "^0.3.0",
diff --git a/test/fixtures/remarkable/typographer.txt b/test/fixtures/remarkable/typographer.txt
index 1afa319..5b44b24 100644
--- a/test/fixtures/remarkable/typographer.txt
+++ b/test/fixtures/remarkable/typographer.txt
@@ -62,6 +62,19 @@ em-dashes
 .
 
 
+linkify
+.
+url http://www.youtube.com/watch?v=5Jt5GEr4AYg.
+.
+<p>url <a href="http://www.youtube.com/watch?v=5Jt5GEr4AYg">http://www.youtube.com/watch?v=5Jt5GEr4AYg</a>.</p>
+.
+.
+don't touch text in links <https://example.com>
+.
+<p>don't touch text in links <a href="https://example.com">https://example.com</a></p>
+.
+
+
 
 TODO: