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require 'thor/core_ext/hash_with_indifferent_access'
require 'thor/core_ext/ordered_hash'
require 'thor/error'
require 'thor/shell'
require 'thor/invocation'
require 'thor/parser'
require 'thor/task'
require 'thor/util'
class Thor
autoload :Actions, 'thor/actions'
autoload :RakeCompat, 'thor/rake_compat'
# Shortcuts for help.
HELP_MAPPINGS = %w(-h -? --help -D)
# Thor methods that should not be overwritten by the user.
THOR_RESERVED_WORDS = %w(invoke shell options behavior root destination_root relative_root
action add_file create_file in_root inside run run_ruby_script)
module Base
attr_accessor :options, :parent_options, :args
# It receives arguments in an Array and two hashes, one for options and
# other for configuration.
#
# Notice that it does not check if all required arguments were supplied.
# It should be done by the parser.
#
# ==== Parameters
# args<Array[Object]>:: An array of objects. The objects are applied to their
# respective accessors declared with <tt>argument</tt>.
#
# options<Hash>:: An options hash that will be available as self.options.
# The hash given is converted to a hash with indifferent
# access, magic predicates (options.skip?) and then frozen.
#
# config<Hash>:: Configuration for this Thor class.
#
def initialize(args=[], options={}, config={})
parse_options = self.class.class_options
# The start method splits inbound arguments at the first argument
# that looks like an option (starts with - or --). It then calls
# new, passing in the two halves of the arguments Array as the
# first two parameters.
if options.is_a?(Array)
task_options = config.delete(:task_options) # hook for start
parse_options = parse_options.merge(task_options) if task_options
array_options, hash_options = options, {}
else
# Handle the case where the class was explicitly instantiated
# with pre-parsed options.
array_options, hash_options = [], options
end
# Let Thor::Options parse the options first, so it can remove
# declared options from the array. This will leave us with
# a list of arguments that weren't declared.
opts = Thor::Options.new(parse_options, hash_options)
self.options = opts.parse(array_options)
# If unknown options are disallowed, make sure that none of the
# remaining arguments looks like an option.
opts.check_unknown! if self.class.check_unknown_options?(config)
# Add the remaining arguments from the options parser to the
# arguments passed in to initialize. Then remove any positional
# arguments declared using #argument (this is primarily used
# by Thor::Group). Tis will leave us with the remaining
# positional arguments.
thor_args = Thor::Arguments.new(self.class.arguments)
thor_args.parse(args + opts.remaining).each { |k,v| send("#{k}=", v) }
args = thor_args.remaining
@args = args
end
class << self
def included(base) #:nodoc:
base.send :extend, ClassMethods
base.send :include, Invocation
base.send :include, Shell
end
# Returns the classes that inherits from Thor or Thor::Group.
#
# ==== Returns
# Array[Class]
#
def subclasses
@subclasses ||= []
end
# Returns the files where the subclasses are kept.
#
# ==== Returns
# Hash[path<String> => Class]
#
def subclass_files
@subclass_files ||= Hash.new{ |h,k| h[k] = [] }
end
# Whenever a class inherits from Thor or Thor::Group, we should track the
# class and the file on Thor::Base. This is the method responsable for it.
#
def register_klass_file(klass) #:nodoc:
file = caller[1].match(/(.*):\d+/)[1]
Thor::Base.subclasses << klass unless Thor::Base.subclasses.include?(klass)
file_subclasses = Thor::Base.subclass_files[File.expand_path(file)]
file_subclasses << klass unless file_subclasses.include?(klass)
end
end
module ClassMethods
def attr_reader(*) #:nodoc:
no_tasks { super }
end
def attr_writer(*) #:nodoc:
no_tasks { super }
end
def attr_accessor(*) #:nodoc:
no_tasks { super }
end
# If you want to raise an error for unknown options, call check_unknown_options!
# This is disabled by default to allow dynamic invocations.
def check_unknown_options!
@check_unknown_options = true
end
def check_unknown_options #:nodoc:
@check_unknown_options ||= from_superclass(:check_unknown_options, false)
end
def check_unknown_options?(config) #:nodoc:
!!check_unknown_options
end
# Adds an argument to the class and creates an attr_accessor for it.
#
# Arguments are different from options in several aspects. The first one
# is how they are parsed from the command line, arguments are retrieved
# from position:
#
# thor task NAME
#
# Instead of:
#
# thor task --name=NAME
#
# Besides, arguments are used inside your code as an accessor (self.argument),
# while options are all kept in a hash (self.options).
#
# Finally, arguments cannot have type :default or :boolean but can be
# optional (supplying :optional => :true or :required => false), although
# you cannot have a required argument after a non-required argument. If you
# try it, an error is raised.
#
# ==== Parameters
# name<Symbol>:: The name of the argument.
# options<Hash>:: Described below.
#
# ==== Options
# :desc - Description for the argument.
# :required - If the argument is required or not.
# :optional - If the argument is optional or not.
# :type - The type of the argument, can be :string, :hash, :array, :numeric.
# :default - Default value for this argument. It cannot be required and have default values.
# :banner - String to show on usage notes.
#
# ==== Errors
# ArgumentError:: Raised if you supply a required argument after a non required one.
#
def argument(name, options={})
is_thor_reserved_word?(name, :argument)
no_tasks { attr_accessor name }
required = if options.key?(:optional)
!options[:optional]
elsif options.key?(:required)
options[:required]
else
options[:default].nil?
end
remove_argument name
arguments.each do |argument|
next if argument.required?
raise ArgumentError, "You cannot have #{name.to_s.inspect} as required argument after " <<
"the non-required argument #{argument.human_name.inspect}."
end if required
arguments << Thor::Argument.new(name, options[:desc], required, options[:type],
options[:default], options[:banner])
end
# Returns this class arguments, looking up in the ancestors chain.
#
# ==== Returns
# Array[Thor::Argument]
#
def arguments
@arguments ||= from_superclass(:arguments, [])
end
# Adds a bunch of options to the set of class options.
#
# class_options :foo => false, :bar => :required, :baz => :string
#
# If you prefer more detailed declaration, check class_option.
#
# ==== Parameters
# Hash[Symbol => Object]
#
def class_options(options=nil)
@class_options ||= from_superclass(:class_options, {})
build_options(options, @class_options) if options
@class_options
end
# Adds an option to the set of class options
#
# ==== Parameters
# name<Symbol>:: The name of the argument.
# options<Hash>:: Described below.
#
# ==== Options
# :desc:: -- Description for the argument.
# :required:: -- If the argument is required or not.
# :default:: -- Default value for this argument.
# :group:: -- The group for this options. Use by class options to output options in different levels.
# :aliases:: -- Aliases for this option. <b>Note:</b> Thor follows a convention of one-dash-one-letter options. Thus aliases like "-something" wouldn't be parsed; use either "\--something" or "-s" instead.
# :type:: -- The type of the argument, can be :string, :hash, :array, :numeric or :boolean.
# :banner:: -- String to show on usage notes.
# :hide:: -- If you want to hide this option from the help.
#
def class_option(name, options={})
build_option(name, options, class_options)
end
# Removes a previous defined argument. If :undefine is given, undefine
# accessors as well.
#
# ==== Parameters
# names<Array>:: Arguments to be removed
#
# ==== Examples
#
# remove_argument :foo
# remove_argument :foo, :bar, :baz, :undefine => true
#
def remove_argument(*names)
options = names.last.is_a?(Hash) ? names.pop : {}
names.each do |name|
arguments.delete_if { |a| a.name == name.to_s }
undef_method name, "#{name}=" if options[:undefine]
end
end
# Removes a previous defined class option.
#
# ==== Parameters
# names<Array>:: Class options to be removed
#
# ==== Examples
#
# remove_class_option :foo
# remove_class_option :foo, :bar, :baz
#
def remove_class_option(*names)
names.each do |name|
class_options.delete(name)
end
end
# Defines the group. This is used when thor list is invoked so you can specify
# that only tasks from a pre-defined group will be shown. Defaults to standard.
#
# ==== Parameters
# name<String|Symbol>
#
def group(name=nil)
case name
when nil
@group ||= from_superclass(:group, 'standard')
else
@group = name.to_s
end
end
# Returns the tasks for this Thor class.
#
# ==== Returns
# OrderedHash:: An ordered hash with tasks names as keys and Thor::Task
# objects as values.
#
def tasks
@tasks ||= Thor::CoreExt::OrderedHash.new
end
# Returns the tasks for this Thor class and all subclasses.
#
# ==== Returns
# OrderedHash:: An ordered hash with tasks names as keys and Thor::Task
# objects as values.
#
def all_tasks
@all_tasks ||= from_superclass(:all_tasks, Thor::CoreExt::OrderedHash.new)
@all_tasks.merge(tasks)
end
# Removes a given task from this Thor class. This is usually done if you
# are inheriting from another class and don't want it to be available
# anymore.
#
# By default it only remove the mapping to the task. But you can supply
# :undefine => true to undefine the method from the class as well.
#
# ==== Parameters
# name<Symbol|String>:: The name of the task to be removed
# options<Hash>:: You can give :undefine => true if you want tasks the method
# to be undefined from the class as well.
#
def remove_task(*names)
options = names.last.is_a?(Hash) ? names.pop : {}
names.each do |name|
tasks.delete(name.to_s)
all_tasks.delete(name.to_s)
undef_method name if options[:undefine]
end
end
# All methods defined inside the given block are not added as tasks.
#
# So you can do:
#
# class MyScript < Thor
# no_tasks do
# def this_is_not_a_task
# end
# end
# end
#
# You can also add the method and remove it from the task list:
#
# class MyScript < Thor
# def this_is_not_a_task
# end
# remove_task :this_is_not_a_task
# end
#
def no_tasks
@no_tasks = true
yield
ensure
@no_tasks = false
end
# Sets the namespace for the Thor or Thor::Group class. By default the
# namespace is retrieved from the class name. If your Thor class is named
# Scripts::MyScript, the help method, for example, will be called as:
#
# thor scripts:my_script -h
#
# If you change the namespace:
#
# namespace :my_scripts
#
# You change how your tasks are invoked:
#
# thor my_scripts -h
#
# Finally, if you change your namespace to default:
#
# namespace :default
#
# Your tasks can be invoked with a shortcut. Instead of:
#
# thor :my_task
#
def namespace(name=nil)
case name
when nil
@namespace ||= Thor::Util.namespace_from_thor_class(self)
else
@namespace = name.to_s
end
end
# Parses the task and options from the given args, instantiate the class
# and invoke the task. This method is used when the arguments must be parsed
# from an array. If you are inside Ruby and want to use a Thor class, you
# can simply initialize it:
#
# script = MyScript.new(args, options, config)
# script.invoke(:task, first_arg, second_arg, third_arg)
#
def start(given_args=ARGV, config={})
config[:shell] ||= Thor::Base.shell.new
dispatch(nil, given_args.dup, nil, config)
rescue Thor::Error => e
ENV["THOR_DEBUG"] == "1" ? (raise e) : config[:shell].error(e.message)
exit(1) if exit_on_failure?
end
# Allows to use private methods from parent in child classes as tasks.
#
# ==== Parameters
# names<Array>:: Method names to be used as tasks
#
# ==== Examples
#
# public_task :foo
# public_task :foo, :bar, :baz
#
def public_task(*names)
names.each do |name|
class_eval "def #{name}(*); super end"
end
end
def handle_no_task_error(task, has_namespace = $thor_runner) #:nodoc:
if has_namespace
raise UndefinedTaskError, "Could not find task #{task.inspect} in #{namespace.inspect} namespace."
else
raise UndefinedTaskError, "Could not find task #{task.inspect}."
end
end
def handle_argument_error(task, error, arity=nil) #:nodoc:
msg = "#{basename} #{task.name}"
if arity
required = arity < 0 ? (-1 - arity) : arity
msg << " requires at least #{required} argument"
msg << "s" if required > 1
else
msg = "call #{msg} as"
end
msg << ": #{self.banner(task).inspect}."
raise InvocationError, msg
end
protected
# Prints the class options per group. If an option does not belong to
# any group, it's printed as Class option.
#
def class_options_help(shell, groups={}) #:nodoc:
# Group options by group
class_options.each do |_, value|
groups[value.group] ||= []
groups[value.group] << value
end
# Deal with default group
global_options = groups.delete(nil) || []
print_options(shell, global_options)
# Print all others
groups.each do |group_name, options|
print_options(shell, options, group_name)
end
end
# Receives a set of options and print them.
def print_options(shell, options, group_name=nil)
return if options.empty?
list = []
padding = options.collect{ |o| o.aliases.size }.max.to_i * 4
options.each do |option|
unless option.hide
item = [ option.usage(padding) ]
item.push(option.description ? "# #{option.description}" : "")
list << item
list << [ "", "# Default: #{option.default}" ] if option.show_default?
end
end
shell.say(group_name ? "#{group_name} options:" : "Options:")
shell.print_table(list, :indent => 2)
shell.say ""
end
# Raises an error if the word given is a Thor reserved word.
def is_thor_reserved_word?(word, type) #:nodoc:
return false unless THOR_RESERVED_WORDS.include?(word.to_s)
raise "#{word.inspect} is a Thor reserved word and cannot be defined as #{type}"
end
# Build an option and adds it to the given scope.
#
# ==== Parameters
# name<Symbol>:: The name of the argument.
# options<Hash>:: Described in both class_option and method_option.
def build_option(name, options, scope) #:nodoc:
scope[name] = Thor::Option.new(name, options[:desc], options[:required],
options[:type], options[:default], options[:banner],
options[:lazy_default], options[:group], options[:aliases], options[:hide])
end
# Receives a hash of options, parse them and add to the scope. This is a
# fast way to set a bunch of options:
#
# build_options :foo => true, :bar => :required, :baz => :string
#
# ==== Parameters
# Hash[Symbol => Object]
def build_options(options, scope) #:nodoc:
options.each do |key, value|
scope[key] = Thor::Option.parse(key, value)
end
end
# Finds a task with the given name. If the task belongs to the current
# class, just return it, otherwise dup it and add the fresh copy to the
# current task hash.
def find_and_refresh_task(name) #:nodoc:
task = if task = tasks[name.to_s]
task
elsif task = all_tasks[name.to_s]
tasks[name.to_s] = task.clone
else
raise ArgumentError, "You supplied :for => #{name.inspect}, but the task #{name.inspect} could not be found."
end
end
# Everytime someone inherits from a Thor class, register the klass
# and file into baseclass.
def inherited(klass)
Thor::Base.register_klass_file(klass)
klass.instance_variable_set(:@no_tasks, false)
end
# Fire this callback whenever a method is added. Added methods are
# tracked as tasks by invoking the create_task method.
def method_added(meth)
meth = meth.to_s
if meth == "initialize"
initialize_added
return
end
# Return if it's not a public instance method
return unless public_instance_methods.include?(meth) ||
public_instance_methods.include?(meth.to_sym)
return if @no_tasks || !create_task(meth)
is_thor_reserved_word?(meth, :task)
Thor::Base.register_klass_file(self)
end
# Retrieves a value from superclass. If it reaches the baseclass,
# returns default.
def from_superclass(method, default=nil)
if self == baseclass || !superclass.respond_to?(method, true)
default
else
value = superclass.send(method)
value.dup if value
end
end
# A flag that makes the process exit with status 1 if any error happens.
def exit_on_failure?
false
end
#
# The basename of the program invoking the thor class.
#
def basename
File.basename($0).split(' ').first
end
# SIGNATURE: Sets the baseclass. This is where the superclass lookup
# finishes.
def baseclass #:nodoc:
end
# SIGNATURE: Creates a new task if valid_task? is true. This method is
# called when a new method is added to the class.
def create_task(meth) #:nodoc:
end
# SIGNATURE: Defines behavior when the initialize method is added to the
# class.
def initialize_added #:nodoc:
end
# SIGNATURE: The hook invoked by start.
def dispatch(task, given_args, given_opts, config) #:nodoc:
raise NotImplementedError
end
end
end
end
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