Add word of the day script

Choose a provider with WOTD_PROVIDER (wordnik or dictionary).
Set the appropriate API key (WORDNIK_API_KEY or DICTIONARY_API_KEY).

src/scripts/word-of-the-day.coffee

@@ -0,0 +1,67 @@
+# Return the word of the day.
+#
+# You'll need an API key from http://developer.wordnik.com/ or from
+# http://developer.dictionary.com/
+#
+# Set the env variable WOTD_PROVIDER to 'wordnik' or 'dictionary'.
+#
+# wotd (me) (short) - Returns the word of the day.
+# word of the day (me) (short) - Returns the word of the day.
+Parser = require("xml2js").Parser
+
+module.exports = (robot) ->
+
+  robot.respond /(word of the day|wotd)\s?(me)?\s?(short)?(.*)$/i, (msg) ->
+    if process.env.WOTD_PROVIDER is "wordnik" and process.env.WORDNIK_API_KEY?
+      wotd_wordnik msg, msg.match[3]?
+    else if process.env.WOTD_PROVIDER is "dictionary" and process.env.DICTIONARY_API_KEY?
+      wotd_dictionary msg, msg.match[3]?
+    else
+      msg.send "Missing WOTD_PROVIDER, WORDNIK_API_KEY or DICTIONARY_API_KEY env variable"
+
+wotd_wordnik = (msg, short_response) ->
+  msg.http("http://api.wordnik.com/api/wordoftheday.json")
+    .header("api_key", process.env.WORDNIK_API_KEY)
+    .get() (err, res, body) ->
+      if err?
+        lookup_error msg, err
+      else
+        wotd = JSON.parse(body)
+        if wotd.wordstring?
+          msg.send "Word of the day: #{wotd.wordstring}"
+        if wotd.definition?
+          for def in wotd.definition
+            msg.send "Definition: #{def.text}"
+        if not short_response
+          if wotd.example?
+            for example in wotd.example
+              msg.send "Example: #{example.text}"
+          if wotd.note?
+            msg.send "Note: #{wotd.note}"
+
+wotd_dictionary = (msg, short_response) ->
+  msg.http("http://api-pub.dictionary.com/v001")
+    .query(vid: process.env.DICTIONARY_API_KEY, type: "wotd")
+    .get() (err, res, body) ->
+      if err?
+        lookup_error msg, err
+      else
+        parser = new Parser
+        parser.parseString body, (error, doc) ->
+          wotd = doc.entry
+          msg.send "Word of the day: #{wotd.word}"
+          msg.send "Pronunciation: #{wotd.pronunciation}"
+          msg.send "Audio: #{wotd.audio["@"].audioUrl}"
+          if short_response
+            msg.send "Definition: (#{wotd.partofspeech}) #{wotd.shortdefinition}"
+          else
+            for def in wotd.definitions.definition
+              msg.send "Definition: (#{def.partofspeech}) #{def.data}"
+            for example in wotd.examples.example
+              msg.send "Example: #{example.quote}"
+            msg.send "Note: #{wotd.footernotes}"
+
+lookup_error = (msg, err) ->
+  console.log err
+  msg.reply "Sorry, there was an error looking up the word of the day"
+