function pgsh() {
  this.prompt = '<span style="color:purple">pgs </span><span style="color:green">$ </span>'
  this.welcome = ''
  this.responses = {
    'about': function() {
      return 'This website belongs to Weiyi Lou ' + new Date().getFullYear()
    },
    'version': function() {
      return 'Parsley Gardens Shell (pgsh) 1.0.0'
    },
    'git': function() {
      return 'Self-Hosted Code repository at <a target="_blank" href="https://code.parsleygardens.net">code.parsleygardens.net</a>'
    },
    'hello': function() {
      return 'Hello to you too'
    },
    'magic': function() {
      return 'Animation and Illustration at <a target="_blank" href="http://slightlymagic.com.au">slightlymagic.com.au</a>'
    },
    'su': function() {
      var output = ''
      if (!this.Parent.su) {
        this.Parent.oldprompt = this.Parent.prompt
        this.Parent.prompt = '<span style="color:purple">root </span><span style="color:red">% </span>'
        this.Parent.su = true
        output = 'With Great Power comes Great'
      }
      return output
    },
    'exit': function() {
      var output = 'Close browser window to exit'
      if (this.Parent.su) {
        this.Parent.prompt = this.Parent.oldprompt
        this.Parent.su = false
        output = ''
      }
      return output
    },
    'help': function() {
      var functions = [];
      for(var name in this.Parent.responses) {
        if (name !== 'Parent') {
          functions.push(name);
        }
      }
      functions.sort();
      return 'Available commands:\n' + functions.join(' ')
    }
  }
  this.process = function(input) {
    var output = ''
    if (input in this.responses) {
      this.responses.Parent = this
      output += this.responses[input]()
    }
    return output
  }
}
var pgsh = new pgsh()