Adding screencast script

Watches for screencast links and posts the images from the main page.

src/scripts/screencast.coffee

@@ -0,0 +1,32 @@
+# Description:
+#   Post screencast image link
+#
+# Dependencies:
+#   None
+#
+# Configuration:
+#   None
+#
+# Commands:
+#   http://screencast.com/... - Display image from Screencast
+#
+# Author:
+#   Chris Larson
+
+Select      = require( "soupselect" ).select
+HTMLParser  = require "htmlparser"
+
+module.exports = (robot) ->
+  robot.hear /(http:\/\/)?screencast.com\/t\/([^\s]*)/i, (msg) ->
+    SCShortId = escape(msg.match[2])
+    try
+      msg.http("http://screencast.com/t/"+SCShortId).get() (err, resp, body) ->
+        htmlHandler  = new HTMLParser.DefaultHandler( (()->), ignoreWhitespace: true )
+        htmlParser   = new HTMLParser.Parser htmlHandler
+
+        htmlParser.parseComplete body
+        try
+          url = Select( htmlHandler.dom, "img.embeddedObject" )[0].attribs.src
+        catch error
+        msg.send url
+    catch error