bricks-cli/lib/cli/lookup-command.js

Command line tool for developing ambitious ember.js apps

'use strict';
var chalk   = require('chalk');
var Command = require('../models/command');

var UnknownCommand = Command.extend({
  printBasicHelp: function() {
    this.ui.write(chalk.red('No help entry for \'' + this.commandName + '\'\n'));
  },

  validateAndRun: function() {
    this.ui.write('The specified command ' + chalk.green(this.commandName) +
                  ' is invalid, for available options see ' +
                  chalk.green('ember help') + '.\n');
  }
});

module.exports = function(commands, commandName, commandArgs, options) {
  if(options == null) {
    options = {};
  }

  var project = options.project;
  var ui      = options.ui;

  // special case help
  if (commandArgs && (commandArgs.indexOf('--help') > -1 || commandArgs.indexOf('-h') > -1)) {
    commandArgs.splice(0);
    commandArgs.push(commandName);
    commandName = 'help';
  }

  function aliasMatches(alias) {
    return alias === commandName;
  }

  function findCommand(commands, commandName) {
    for (var key in commands) {
      var command = commands[key];

      var name = command.prototype.name;
      var aliases = command.prototype.aliases || [];

      if (name === commandName || aliases.some(aliasMatches)) {
        return command;
      }
    }
  }

  // Attempt to find command in ember-cli core commands
  var command = findCommand(commands, commandName);

  var addonCommand;
  // Attempt to find command within addons
  if (project && project.eachAddonCommand) {
    project.eachAddonCommand(function(addonName, commands){
      addonCommand = findCommand(commands, commandName);
    });
  }

  if (command && addonCommand) {
    ui.write(chalk.cyan('warning: An ember-addon has attempted to override the core command "' +
                        command.prototype.name + '". The core command will be used.\n'));
    return command;
  }

  if(command) {
    return command;
  }

  if(addonCommand) {
    return addonCommand;
  }

  // if we didn't find anything, return an "UnknownCommand"
  return UnknownCommand.extend({
    commandName: commandName
  });
};