markdown: Fix stream link handler in corner cases.

* Fixes handling of multiple stream links and invalid stream names.
* Fixes text regex so it handle hash sign the right way.
* Adds tests for these stream link cases.

frontend_tests/node_tests/echo.js

@@ -1,6 +1,8 @@
 /*global Dict */
 var path = require('path');
 var fs = require('fs');
+var jsdom = require("jsdom");
+var window = jsdom.jsdom().defaultView;
 
 global.stub_out_jquery();
 
@@ -30,6 +32,8 @@ add_dependencies({
     marked: 'third/marked/lib/marked.js',
     emoji: 'js/emoji.js',
     people: 'js/people.js',
+    stream_data: 'js/stream_data.js',
+    hashchange: 'js/hashchange',
     fenced_code: 'js/fenced_code.js'
 });
 
@@ -49,6 +53,9 @@ set_global('$', function (obj) {
 
 set_global('feature_flags', {local_echo: true});
 
+jsdom.changeURL(window, 'http://zulip.zulipdev.com');
+set_global('window', window);
+
 var people = global.people;
 
 people.add({
@@ -57,6 +64,25 @@ people.add({
     email: 'cordelia@zulip.com'
 });
 
+var stream_data = global.stream_data;
+var denmark = {
+    subscribed: false,
+    color: 'blue',
+    name: 'Denmark',
+    stream_id: 1,
+    in_home_view: false
+};
+var social = {
+    subscribed: true,
+    color: 'red',
+    name: 'social',
+    stream_id: 2,
+    in_home_view: true,
+    invite_only: true
+};
+stream_data.add_sub('Denmark', denmark);
+stream_data.add_sub('social', social);
+
 var echo = require('js/echo.js');
 
 var bugdown_data = JSON.parse(fs.readFileSync(path.join(__dirname, '../../zerver/fixtures/bugdown-data.json'), 'utf8', 'r'));
@@ -79,6 +105,7 @@ var bugdown_data = JSON.parse(fs.readFileSync(path.join(__dirname, '../../zerver
                      "User Mention @**leo**",
                      "User Mention @**leo f**",
                      "User Mention @**leo with some name**",
+                     "Stream #**Verona**",
                      "This contains !gravatar(leo@zulip.com)",
                      "And an avatar !avatar(leo@zulip.com) is here"
                     ];
@@ -138,6 +165,12 @@ var bugdown_data = JSON.parse(fs.readFileSync(path.join(__dirname, '../../zerver
      expected: '<blockquote>\n<p>quote this for me</p>\n</blockquote>\n<p>thanks</p>'},
     {input: 'This is a @**Cordelia Lear** mention',
      expected: '<p>This is a <span class="user-mention" data-user-email="cordelia@zulip.com">@Cordelia Lear</span> mention</p>'},
+    {input: 'This is a #**Denmark** stream link',
+     expected: '<p>This is a <a class="stream" data-stream-id="1" href="http://zulip.zulipdev.com/#narrow/stream/Denmark">#Denmark</a> stream link</p>'},
+    {input: 'This is #**Denmark** and #**social** stream links',
+     expected: '<p>This is <a class="stream" data-stream-id="1" href="http://zulip.zulipdev.com/#narrow/stream/Denmark">#Denmark</a> and <a class="stream" data-stream-id="2" href="http://zulip.zulipdev.com/#narrow/stream/social">#social</a> stream links</p>'},
+    {input: 'And this is a #**wrong** stream link',
+     expected: '<p>And this is a #**wrong** stream link</p>'},
     {input: 'mmm...:burrito:s',
      expected: '<p>mmm...<img alt=\":burrito:\" class=\"emoji\" src=\"/static/third/gemoji/images/emoji/burrito.png\" title=\":burrito:\">s</p>'},
     {input: 'This is an :poop: message',

static/js/echo.js

@@ -327,6 +327,18 @@ function handleUserMentions(username) {
     }
 }
 
+function handleStream(streamName) {
+    var stream = stream_data.get_sub(streamName);
+    if (stream === undefined) {
+        return undefined;
+    }
+    return '<a class="stream" data-stream-id="' + stream.stream_id + '" ' +
+        'href="' + window.location.origin + '/#narrow/stream/' +
+        hashchange.encodeHashComponent(stream.name) + '"' +
+        '>' + '#' + stream.name + '</a>';
+
+}
+
 function handleRealmFilter(pattern, matches) {
     var url = realm_filter_map[pattern];
 
@@ -340,10 +352,6 @@ function handleRealmFilter(pattern, matches) {
     return url;
 }
 
-function handleStreamLinks(stream_name) {
-    return '<a href="' + window.location.origin + '#narrow/stream/' + hashchange.encodeHashComponent(stream_name) + '">#' + stream_name + '</a>';
-}
-
 function python_to_js_filter(pattern, url) {
     // Converts a python named-group regex to a javascript-compatible numbered
     // group regex... with a regex!
@@ -487,7 +495,7 @@ $(function () {
         avatarHandler: handleAvatar,
         unicodeEmojiHandler: handleUnicodeEmoji,
         userMentionHandler: handleUserMentions,
-        streamLinkHandler: handleStreamLinks,
+        streamHandler: handleStream,
         realmFilterHandler: handleRealmFilter,
         renderer: r,
         preprocessors: [preprocess_code_blocks]

static/third/marked/lib/marked.js

@@ -477,6 +477,7 @@ var inline = {
   emoji: noop,
   unicodeemoji: noop,
   usermention: noop,
+  stream: noop,
   avatar: noop,
   gravatar: noop,
   realm_filters: [],
@@ -537,13 +538,13 @@ inline.zulip = merge({}, inline.breaks, {
   emoji: /^:([A-Za-z0-9_\-\+]+?):/,
   unicodeemoji: /^(\ud83c[\udf00-\udfff]|\ud83d[\udc00-\ude4f]|\ud83d[\ude80-\udeff])/,
   usermention: /^(@(?:\*\*([^\*]+)?\*\*|(\w+)?))/m, // Match multi-word string between @** ** or match any one-word
-  streamlink: /^(#\*\*([^\*]+)\*\*)/,
+  stream: /^#\*\*([^\*]+)\*\*/m,
   avatar: /^!avatar\(([^)]+)\)/,
   gravatar: /^!gravatar\(([^)]+)\)/,
   realm_filters: [],
   text: replace(inline.breaks.text)
     ('|', '|(\ud83c[\udf00-\udfff]|\ud83d[\udc00-\ude4f]|\ud83d[\ude80-\udeff])|')
-    (']|', '@:]|')
+    (']|', '#@:]|')
     ()
 });
 
@@ -725,10 +726,11 @@ InlineLexer.prototype.output = function(src) {
       out += this.usermention(cap[2] || cap[3], cap[1]);
       continue;
     }
-    // streamlink (zulip)
-    if (cap = this.rules.streamlink.exec(src)) {
+
+    // stream (zulip)
+    if (cap = this.rules.stream.exec(src)) {
       src = src.substring(cap[0].length);
-      out += this.streamlink(cap[2], cap[1]);
+      out += this.stream(cap[1], cap[0]);
       continue;
     }
 
@@ -870,22 +872,16 @@ InlineLexer.prototype.usermention = function (username, orig) {
   return orig;
 };
 
-InlineLexer.prototype.streamlink = function(stream_name, orig) {
-  if (stream_data.get_sub(stream_name) === undefined) {
+InlineLexer.prototype.stream = function (streamName, orig) {
+  if (typeof this.options.streamHandler !== 'function')
     return orig;
-  }
-  if (typeof this.options.streamLinkHandler !== 'function')
-  {
-    return orig;
-  }
 
-  var handled = this.options.streamLinkHandler(stream_name);
+  var handled = this.options.streamHandler(streamName);
   if (handled !== undefined) {
     return handled;
   }
-
   return orig;
-}
+};
 
 /**
  * Smartypants Transformations