async shotgun

asyncInvoke.js

//cmd.js
exports.invoke = function(shell, options) {
  shell.emit('async', function(resume) {
    someAsyncFn(function(result){
     shell.log(result);
      resume();
  }); 
  
  //app.js

  var rl = require('readline'),
      shell = ...
  
  var ready = true;
  //..constructors ..
  
  rl.on('line', function(userInput) {
    shell.execute(userInput);
    if (ready) {
      rl.prompt();
    }
  });
  
  shell.on('async', function(fn) {
    ready = false;
    fn(function(){
      ready = true;
      rl.prompt();
    })
  });

That sounds great! I assume the done event will only be fired at the end of execute if invoke is synchronous

That's correct. catdadcode/shotgun#23