first draft of node.js REPL

lib/coffee_script/coffee-script.js

@@ -0,0 +1,20 @@
+(function(){
+  var sys;
+  // Executes the `coffee` Ruby program to convert from CoffeeScript to JavaScript.
+  sys = require('sys');
+  exports.compile = function compile(code, callback) {
+    var coffee, js;
+    js = '';
+    coffee = process.createChildProcess('coffee', ['--eval', '--no-wrap', '--globals']);
+    coffee.addListener('output', function(results) {
+      if ((typeof results !== "undefined" && results !== null)) {
+        return js += results;
+      }
+    });
+    coffee.addListener('exit', function() {
+      return callback(js);
+    });
+    coffee.write(code);
+    return coffee.close();
+  };
+})();

lib/coffee_script/command_line.rb

@@ -118,7 +118,7 @@ Usage:
     def launch_repl
       exec "#{LAUNCHER}"
     rescue Errno::ENOENT
-      puts "Error: Narwhal must be installed to use the interactive REPL."
+      puts "Error: Node.js must be installed to use the interactive REPL."
       exit(1)
     end
 

lib/coffee_script/repl.js

@@ -0,0 +1,33 @@
+(function(){
+  var coffee, prompt, quit, readline, run;
+  // A CoffeeScript port/version of the Node.js REPL.
+  // Required modules.
+  coffee = require('./coffee-script');
+  process.mixin(require('sys'));
+  // Shortcut variables.
+  prompt = 'coffee> ';
+  quit = function quit() {
+    return process.stdio.close();
+  };
+  // The main REPL function. Called everytime a line of code is entered.
+  readline = function readline(code) {
+    return coffee.compile(code, run);
+  };
+  // Attempt to evaluate the command. If there's an exception, print it.
+  run = function run(js) {
+    var val;
+    try {
+      val = eval(js);
+      if (val !== undefined) {
+        p(val);
+      }
+    } catch (err) {
+      puts(err.stack || err.toString());
+    }
+    return print(prompt);
+  };
+  // Start up the REPL.
+  process.stdio.open();
+  process.stdio.addListener('data', readline);
+  print(prompt);
+})();

src/coffee-script.coffee

@@ -0,0 +1,15 @@
+# Executes the `coffee` Ruby program to convert from CoffeeScript to JavaScript.
+
+sys: require('sys')
+
+exports.compile: (code, callback) ->
+  js: ''
+  coffee: process.createChildProcess 'coffee', ['--eval', '--no-wrap', '--globals']
+  coffee.addListener 'output', (results) ->
+    js += results if results?
+  coffee.addListener 'exit', ->
+    callback(js)
+  coffee.write(code)
+  coffee.close()
+
+

src/repl.coffee

@@ -0,0 +1,26 @@
+# A CoffeeScript port/version of the Node.js REPL.
+
+# Required modules.
+coffee: require './coffee-script'
+process.mixin require 'sys'
+
+# Shortcut variables.
+prompt: 'coffee> '
+quit:   -> process.stdio.close()
+
+# The main REPL function. Called everytime a line of code is entered.
+readline: (code) -> coffee.compile code, run
+
+# Attempt to evaluate the command. If there's an exception, print it.
+run: (js) ->
+  try
+    val: eval(js)
+    p val if val isnt undefined
+  catch err
+    puts err.stack or err.toString()
+  print prompt
+
+# Start up the REPL.
+process.stdio.open()
+process.stdio.addListener 'data', readline
+print prompt