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- # optparse.coffee

- ¶

      {repeat} = require './helpers'

- ¶

  A simple OptionParser class to parse option flags from the command-line. Use it like so:

      parser  = new OptionParser switches, helpBanner
      options = parser.parse process.argv

  The first non-option is considered to be the start of the file (and file option) list, and all subsequent arguments are left unparsed.

      exports.OptionParser = class OptionParser

- ¶

  Initialize with a list of valid options, in the form:

      [short-flag, long-flag, description]

  Along with an an optional banner for the usage help.

        constructor: (rules, @banner) ->
          @rules = buildRules rules

- ¶

  Parse the list of arguments, populating an `options` object with all of the specified options, and return it. Options after the first non-option argument are treated as arguments. `options.arguments` will be an array containing the remaining arguments. This is a simpler API than many option parsers that allow you to attach callback actions for every flag. Instead, you’re responsible for interpreting the options object.

        parse: (args) ->
          options = arguments: []
          skippingArgument = no
          originalArgs = args
          args = normalizeArguments args
          for arg, i in args
            if skippingArgument
              skippingArgument = no
              continue
            if arg is '--'
              pos = originalArgs.indexOf '--'
              options.arguments = options.arguments.concat originalArgs[(pos + 1)..]
              break
            isOption = !!(arg.match(LONG_FLAG) or arg.match(SHORT_FLAG))

- ¶

  the CS option parser is a little odd; options after the first non-option argument are treated as non-option arguments themselves

            seenNonOptionArg = options.arguments.length > 0
            unless seenNonOptionArg
              matchedRule = no
              for rule in @rules
                if rule.shortFlag is arg or rule.longFlag is arg
                  value = true
                  if rule.hasArgument
                    skippingArgument = yes
                    value = args[i + 1]
                  options[rule.name] = if rule.isList then (options[rule.name] or []).concat value else value
                  matchedRule = yes
                  break
              throw new Error "unrecognized option: #{arg}" if isOption and not matchedRule
            if seenNonOptionArg or not isOption
              options.arguments.push arg
          options

- ¶

  Return the help text for this OptionParser, listing and describing all of the valid options, for `--help` and such.

        help: ->
          lines = []
          lines.unshift "#{@banner}\n" if @banner
          for rule in @rules
            spaces  = 15 - rule.longFlag.length
            spaces  = if spaces > 0 then repeat ' ', spaces else ''
            letPart = if rule.shortFlag then rule.shortFlag + ', ' else '    '
            lines.push '  ' + letPart + rule.longFlag + spaces + rule.description
          "\n#{ lines.join('\n') }\n"

- ¶

  ## Helpers

- ¶
- ¶

  Regex matchers for option flags.

      LONG_FLAG  = /^(--\w[\w\-]*)/
      SHORT_FLAG = /^(-\w)$/
      MULTI_FLAG = /^-(\w{2,})/
      OPTIONAL   = /\[(\w+(\*?))\]/

- ¶

  Build and return the list of option rules. If the optional short-flag is unspecified, leave it out by padding with `null`.

      buildRules = (rules) ->
        for tuple in rules
          tuple.unshift null if tuple.length < 3
          buildRule tuple...

- ¶

  Build a rule from a `-o` short flag, a `--output [DIR]` long flag, and the description of what the option does.

      buildRule = (shortFlag, longFlag, description, options = {}) ->
        match     = longFlag.match(OPTIONAL)
        longFlag  = longFlag.match(LONG_FLAG)[1]
        {
          name:         longFlag.substr 2
          shortFlag:    shortFlag
          longFlag:     longFlag
          description:  description
          hasArgument:  !!(match and match[1])
          isList:       !!(match and match[2])
        }

- ¶

  Normalize arguments by expanding merged flags into multiple flags. This allows you to have `-wl` be the same as `--watch --lint`.

      normalizeArguments = (args) ->
        args = args[..]
        result = []
        for arg in args
          if match = arg.match MULTI_FLAG
            result.push '-' + l for l in match[1].split ''
          else
            result.push arg
        result