Spin given common spintax formatted text

spin me <query> - Returns a spun version of the input. Supports nested
sets and multiline input.

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 npm-debug.log
+.DS_Store*

src/scripts/spin.coffee

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+# Spin given common spintax formatted text
+#
+# - supports nested sets
+# - supports multiline input for robot
+#
+# spin me <query> - Returns a spun version of the input.
+#
+# Example: spin me This is {my nested {spintax|spuntext} formatted string|your nested {spintax|spuntext} formatted string} test.
+# 
+# TODO: different syntaxes like '{', '|', '}' OR '[spin]', '~', '[/spin]'
+#
+split_str = '|'
+replace_regexp_str = /[{}]/gi
+match_regexp_str = /{[^{}]+?}/gi
+
+spin = (txt) ->
+	if txt
+		txt = capture(txt) while txt.match(match_regexp_str)
+	txt
+
+capture = (txt) ->
+	match = txt.match(match_regexp_str)
+	if (match[0])
+		words = match[0].split(split_str)
+		replace = words[Math.floor(Math.random()*words.length)].replace(replace_regexp_str, '')
+		txt = txt.replace(match[0], replace)
+	txt
+
+module.exports = (robot) ->
+  robot.respond /spin me ([\s\S]*)/i, (msg) ->
+    output = spin(msg.match[0])
+    msg.send output