iggins/index.js

Irken plugin for listening for key combinations

'use strict';

var _ = require('lodash');

var predicates = require('./predicates');

function iggins(app, opts, done) {

  var handlers = [];

  function keypress(predicate, handler) {
    var keyAction = {
      predicate: predicate,
      handler: handler
    };

    handlers.push(keyAction);

    return _.partial(_.remove, handlers, keyAction);
  }

  function match(evt) {
    _.forEach(handlers, function (handlerObject) {
      if (handlerObject.predicate(evt)) {
        handlerObject.handler(evt);
      }
    });
  }

  _.assign(keypress, predicates);

  app.expose('keypress', keypress);

  if (typeof window !== 'undefined') {
    window.addEventListener('keydown', match);
  }

  done();
}

module.exports = iggins;