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repl.coffee

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A very simple Read-Eval-Print-Loop. Compiles one line at a time to JavaScript and evaluates it. Good for simple tests, or poking around the Node.js API. Using it looks like this:

coffee> puts "#{num} bottles of beer" for num in [99..1]

             		           
                               
                            
                 #               
               
Require the coffee-script module to get access to the compiler.
             		                            
CoffeeScript = require './coffee-script'
helpers      = require('./helpers').helpers
readline     = require 'readline'
             		           
                               
                            
                 #               
               
Start by opening up stdio.
             		                            
stdio = process.openStdin()
             		           
                               
                            
                 #               
               
Quick alias for quitting the REPL.
             		                            
helpers.extend global, quit: -> process.exit(0)
             		           
                               
                            
                 #               
               
The main REPL function. run is called every time a line of code is entered.
Attempt to evaluate the command. If there's an exception, print it out instead
of exiting.
             		                            
run = (buffer) ->
  try
    val = CoffeeScript.eval buffer.toString(), noWrap: true, globals: true, fileName: 'repl'
    puts inspect val if val isnt undefined
  catch err
    puts err.stack or err.toString()
  repl.prompt()
             		           
                               
                            
                 #               
               
Create the REPL by listening to stdin.
             		                            
repl = readline.createInterface stdio
repl.setPrompt 'coffee> '
stdio.on 'data',   (buffer) -> repl.write buffer
repl.on  'close',  -> stdio.destroy()
repl.on  'line',   run
repl.prompt()