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puma--puma/lib/mongrel/command.rb

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require 'singleton'
require 'optparse'
require 'pluginfactory'
module Mongrel
# Contains all of the various commands that are used with
# Mongrel servers.
module Command
# A Command pattern implementation used to create the set of command available to the user
# from Mongrel. The script uses objects which implement this interface to do the
# user's bidding.
#
# Creating a new command is very easy, and you can do it without modifying the source
# of Mongrel thanks to PluginFactory. What you do is the following:
#
# 1.
class Command
include PluginFactory
attr_reader :valid, :done_validating
# Called by the implemented command to set the options for that command.
# Every option has a short and long version, a description, a variable to
# set, and a default value. No exceptions.
def options(opts)
# process the given options array
opts.each do |short, long, help, variable, default|
self.instance_variable_set(variable, default)
@opt.on(short, long, help) do |arg|
self.instance_variable_set(variable, arg)
end
end
end
# Called by the subclass to setup the command and parse the argv arguments.
# The call is destructive on argv since it uses the OptionParser#parse! function.
def initialize(argv)
@opt = OptionParser.new
@valid = true
# this is retarded, but it has to be done this way because -h and -v exit
@done_validating = false
@original_args = argv.dup
configure
# I need to add my own -h definition to prevent the -h by default from exiting.
@opt.on_tail("-h", "--help", "Show this message") do
@done_validating = true
puts @opt
end
# I need to add my own -v definition to prevent the -h from exiting by default as well.
@opt.on_tail("--version", "Show version") do
@done_validating = true
if VERSION
puts "Version #{VERSION}"
end
end
@opt.parse! argv
end
# Tells the PluginFactory where to look for additional commands. By default
# it's just a "plugins" directory wherever we are located.
def self.derivativeDirs
return ["plugins"]
end
# Returns true/false depending on whether the command is configured properly.
def validate
return @valid
end
# Returns a help message. Defaults to OptionParser#help which should be good.
def help
@opt.help
end
# Runs the command doing it's job. You should implement this otherwise it will
# throw a NotImplementedError as a reminder.
def run
raise NotImplementedError
end
# Validates the given expression is true and prints the message if not, exiting.
def valid?(exp, message)
if not @done_validating and (not exp)
failure message
@valid = false
@done_validating = true
end
end
# Validates that a file exists and if not displays the message
def valid_exists?(file, message)
valid?(file != nil && File.exist?(file), message)
end
# Validates that the file is a file and not a directory or something else.
def valid_file?(file, message)
valid?(file != nil && File.file?(file), message)
end
# Validates that the given directory exists
def valid_dir?(file, message)
valid?(file != nil && File.directory?(file), message)
end
# Just a simple method to display failure until something better is developed.
def failure(message)
STDERR.puts "!!! #{message}"
end
end
# A Singleton class that manages all of the available commands
# and handles running them.
class Registry
include Singleton
# Builds a list of possible commands from the Command derivates list
def commands
list = Command.derivatives()
match = Regexp.new("(.*::.*)|(.*command.*)", Regexp::IGNORECASE)
results = []
list.keys.each do |key|
results << key.to_s unless match.match(key.to_s)
end
return results.sort
end
# Prints a list of available commands.
def print_command_list
puts "Available commands are:\n\n"
self.commands.each do |name|
puts " - #{name}\n"
end
puts "\nEach command takes -h as an option to get help."
end
# Runs the args against the first argument as the command name.
# If it has any errors it returns a false, otherwise it return true.
def run(args)
# find the command
cmd_name = args.shift
if !cmd_name or cmd_name == "?" or cmd_name == "help"
print_command_list
return true
end
# command exists, set it up and validate it
begin
command = Command.create(cmd_name, args)
rescue FactoryError
STDERR.puts "INVALID COMMAND: #$!"
print_command_list
return
end
# Normally the command is NOT valid right after being created
# but sometimes (like with -h or -v) there's no further processing
# needed so the command is already valid so we can skip it.
if not command.done_validating
if not command.validate
STDERR.puts "#{cmd_name} reported an error. Use -h to get help."
return false
else
command.run
end
end
return true
end
end
end
end