Class: CouchShell::Commandline

Inherits:
Object
  • Object
show all
Defined in:
lib/couch-shell/commandline.rb

Defined Under Namespace

Classes: ArgNotAllowedError, Error, Opt, OptArgMissingError, UnknownOptError

Instance Method Summary collapse

Constructor Details

#initialize {|_self| ... } ⇒ Commandline

Returns a new instance of Commandline.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/couch-shell/commandline.rb', line 88

def initialize
  @arg_action = nil
  @opts = []
  @leading_help = nil
  @trailing_help = nil
  yield self
end

Instance Method Details

#arg(&block) ⇒ Object 



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# File 'lib/couch-shell/commandline.rb', line 96

def arg(&block)
  @arg_action = block
end

#opt(optspec1, optspec2 = nil, doc = nil, &block) ⇒ Object 



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# File 'lib/couch-shell/commandline.rb', line 100

def opt(optspec1, optspec2 = nil, doc = nil, &block)
  raise "optspec and action block required" unless optspec1 && block
  option = Opt.new
  option.doc = doc
  option.parse_spec! optspec1
  if optspec2 && doc
    option.parse_spec! optspec2 if optspec2
  elsif optspec2
    option.doc = doc
  end
  option.action = block
  @opts << option
end

#optlisting(indent = " ") ⇒ Object 



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# File 'lib/couch-shell/commandline.rb', line 114

def optlisting(indent = "  ")
  max_value_len = @opts.map(&:value).compact.map(&:length).max || 0
  String.new.tap do |t|
    @opts.each { |opt|
      t << indent
      if opt.short
        t << "-#{opt.short} "
        if opt.value
          t << opt.value
          t << (" " * (max_value_len - opt.value.length))
        end
      else
        t << "   " << (" " * max_value_len)
      end
      t << "    "
      if opt.long
        t << "--#{opt.long}"
        t << "=#{opt.value}" if opt.value
      end
      t << "\n"
      if opt.doc
        opt.doc.each_line { |l|
          t << (indent * 3) << l
        }
      end
      t << "\n"
    }
  end
end

#process(args) ⇒ Object

May raise Commandline::Error or subclass thereof.



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# File 'lib/couch-shell/commandline.rb', line 145

def process(args)
  optstop = false
  opt_to_eat_arg = nil
  opt_to_eat_arg_arg = nil
  args.each { |arg|
    if optstop
      if opt_to_eat_arg
        raise OptArgMissingError.new(opt_to_eat_arg_arg)
      end
      @arg_action.call(arg)
      next
    end
    if opt_to_eat_arg
      opt_to_eat_arg.action.call(arg)
      opt_to_eat_arg = nil
      opt_to_eat_arg_arg = nil
      next
    end
    case arg
    when "--"
      optstop = true
    when /\A--([^=]*)(=.*)?\z/
      long = $1
      if long.nil? || long.empty?
        raise Error, "expected option name in `#{arg}'"
      end
      opt = @opts.find { |opt| opt.long == long }
      raise UnknownOptError.new(arg) unless opt
      if opt.value
        if $2
          opt.action.call($2[1..-1])
        else
          raise OptArgMissingError.new(arg)
        end
      else
        if $2
          raise ArgNotAllowedError.new(arg)
        else
          opt.action.call
        end
      end
    when /\A-([^-])\z/
      short = $1
      opt = @opts.find { |opt| opt.short == short }
      raise UnknownOptError.new(arg) unless opt
      if opt.value
        opt_to_eat_arg = opt
        opt_to_eat_arg_arg = arg
      else
        opt.action.call
      end
    when /\A-/
      raise UnknownOptError.new(arg)
    else
      if @arg_action
        @arg_action.call(arg)
      else
        ArgNotAllowedError.new(arg)
      end
    end
  }
  if opt_to_eat_arg
    raise OptArgMissingError.new(opt_to_eat_arg_arg)
  end
end