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#!/usr/bin/env ruby
#--
# Ruwiki
# Copyright © 2002 - 2004, Digikata and HaloStatue
# Alan Chen (alan@digikata.com)
# Austin Ziegler (ruwiki@halostatue.ca)
#
# Licensed under the same terms as Ruby.
#
# This file may be renamed to change the URI for the wiki.
#
# $Id$
#++
# Implements the command pattern. Commands are used by the command-line
class Ruwiki::Utils::CommandPattern
class AbstractCommandError < Exception; end
class UnknownCommandError < RuntimeError; end
class CommandAlreadyExists < RuntimeError; end
class MissingParameterError < ArgumentError
def initialize(argument)
@argument = argument
end
attr_reader :argument
end
class << self
def add(command)
command = command.new if command.kind_of?(Class)
@commands ||= {}
if @commands.has_key?(command.name)
raise CommandAlreadyExists
else
@commands[command.name] = command
end
if command.respond_to?(:altname)
unless @commands.has_key?(command.altname)
@commands[command.altname] = command
end
end
end
def <<(command)
add(command)
end
attr_accessor :default
def default=(command) #:nodoc:
if command.kind_of?(Ruwiki::Utils::CommandPattern)
@default = command
elsif command.kind_of?(Class)
@default = command.new
elsif @commands.has_key?(command)
@default = @commands[command]
else
raise UnknownCommandError
end
end
def command?(command)
@commands.has_key?(command)
end
def command(command)
if command?(command)
@commands[command]
else
@default
end
end
def [](cmd)
self.command(cmd)
end
def default_ioe(ioe = {})
ioe[:input] ||= $stdin
ioe[:output] ||= $stdout
ioe[:error] ||= $stderr
ioe
end
end
def [](args, opts = {}, ioe = {})
call(args, opts, ioe)
end
def name
raise AbstractCommandError
end
def call(args, opts = {}, ioe = {})
raise AbstractCommandError
end
def help
raise AbstractCommandError
end
end
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