support calling from the command line

index.js

@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 /*
 color
 */"use strict"
@@ -133,4 +135,18 @@ color.matches = function(string){
     return !!(string + "").match(regexp)
 }
 
+var firstArg = function(fn, context) {
+    return function() {
+        var args = Array.prototype.slice.call(arguments);
+        return fn.call(context, args.length ? args[0] : null);
+    };
+}
+
+// http://nodejs.org/api/modules.html#modules_accessing_the_main_module
+if (require.main === module) {
+    process.argv.slice(2)
+        .map(firstArg(color))
+        .forEach(firstArg(console.log, console));
+}
+
 module.exports = color