Add stock monitoring command

scripts/alpha_vantage.coffee

@@ -0,0 +1,33 @@
+# Description:
+#   Get an equity price.
+#
+# Commands:
+#   hubot stock <symbol> - Get the equity price of your choice
+
+AlphaVantage = require '../lib/alpha_vantage'
+
+module.exports = (robot) ->
+  robot.respond /stock ([a-z_0-9^]+)$/i, (msg) ->
+    try
+      new AlphaVantage(
+        function: 'TIME_SERIES_DAILY',
+        symbol: msg.match[1]
+      ).execute(robot, (data) ->
+        if data.hasOwnProperty('error')
+          msg.send(attachments: [{ color: '#ff0000', title: 'Error Message', text: data.error }])
+        else
+          attachments = []
+          for c in data.compare
+            attachments.push(
+              color: (c.diff > 0 ? '#155724' : (c.diff < 0 ? '#721c24' : '#383d41')),
+              text: "#{c.diff} (#{c.ratio}%) at #{new Date(c.timestamp)}"
+            )
+
+          msg.send(
+            text: "*#{data.price}* #{new Date(data.timestamp)}",
+            attachments: attachments,
+            mrkdwn: true
+          )
+      )
+    catch error
+      msg.send "#{error.name}: #{error.message}"