colorful/lib/program.js

/*
 * Command helper in terminal
 * @author: Hsiaoming Yang <lepture@me.com>
 *
 */

var color = require('./color')


function Command(name, executable, description) {
  if (!(this instanceof Command)) {
    return new Command(name, executable, description)
  }
  if (typeof name === 'object') {
    var obj = name
    this.name = obj.name
    this.executable = obj.executable || obj.name
    this.description = obj.description
    this.version = obj.version
    this.group = obj.group
    this.color = obj.color
    return this
  }

  this.name = name
  if (!description) {
    description = executable
    executable = name
  }
  this.executable = executable
  this.description = description
  this.version = undefined
  this.group = undefined
  this.color = undefined
  return this
}

Command.prototype.executable = function(executable) {
  this.executable = executable
}

Command.prototype.description = function(description) {
  this.description = description
}

exports.Command = Command

exports.printHelp = function(cmd) {
  var colorfunc = null
  if (typeof cmd.color === 'string') {
    colorfunc = color[cmd.color]
  } else if (typeof cmd.color === 'function') {
    colorfunc = cmd.color
  }
  var name = cmd.name
  if (colorfunc) {
    var name = colorfunc(name)
  }
  var text = '    ' + pad(name, 15, cmd.name.length)
  if (cmd.description.length > 60) {
    text += cmd.description.slice(0, 58)
    if (cmd.description.slice(58, 59) !== ' ') {
      text += '-'
    }
    text += '\n'
    text += Array(21).join(' ')
    text += cmd.description.slice(58)
  } else {
    text += cmd.description
  }
  console.log(text)
}

function pad(str, width, strWidth) {
  var len = Math.max(0, width - (strWidth || str.length))
  return str + Array(len + 1).join(' ')
}