// mixin to generate a single key
//
// args: (mandatory) one of the following:
//    - action
//    - action label
//
// action: (mandatory) one of the following:
//    - a keysym with or without the XK_ prefix eg 'XK_a' or 'a'
//    - id
//      a command-id as defined in command yaml
//    - id:params
//      command-id with a list of comma-delimited parameters
//
//    Full list of keysyms at https://github.com/sidorares/node-x11/blob/master/lib/keysyms.js
//
// label: (optional) text string e.g. 'my amazing label'
//    May include font-awesome classes prefixed with 'fa-' in which case an
//    icon is displayed. If label isn't supplied then treat action as the label.
//
mixin key(args, label)
  - var arr = args.toString().split(' ')
  - var act = arr[0]
  - var faw = []
  - var txt = []
  - words = (label && label.split(' ')) || (arr.length > 1 && arr.slice(1)) || [act]
  //- console.log(words)
  each w in words
    if w && w.substring(0,3) == 'fa-'
      - faw.push(w)
    else
      - txt.push(w)
  - txt = txt.join(' ')
  .key.up(id=act, class=attributes.class, title=txt)
    if faw.length
      - faw = faw.join(' ')
      // icon
      .label
        i.fa.fa-2x(class=faw)
    else
      // text
      - var cla = 'len-' + txt.toString().length
      .label(class=cla)= txt

// mixin to generate multiple keys
//
// accepts either
//    - a space-delimited string of actions e.g. 'q w e r t y'
// or
//    - a list of args for +key
//
//  Any classes or attributes are applied to each key in turn. Examples:
//
//  +keys('a b').z        expands to +key('a').z +key('b').z
//  +keys('a b c').z      expands to +key('a').z +key('b').z +key('c').z
//  +keys('a', 'b').z     expands to +key('a').z +key('b').z
//  +keys('a b', 'c d').z expands to +key('a b').z +key('c d').z
//
mixin keys(...args)
  if (args.length == 1)
    - args = args[0].split(' ')
  each arg in args
    +key(arg)&attributes(attributes)