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# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks for unused method arguments.
#
# @example
#
# # bad
#
# def some_method(used, unused, _unused_but_allowed)
# puts used
# end
#
# @example
#
# # good
#
# def some_method(used, _unused, _unused_but_allowed)
# puts used
# end
class UnusedMethodArgument < Cop
include UnusedArgument
def autocorrect(node)
UnusedArgCorrector.correct(processed_source, node)
end
private
def check_argument(variable)
return unless variable.method_argument?
return if variable.keyword_argument? &&
cop_config['AllowUnusedKeywordArguments']
if cop_config['IgnoreEmptyMethods']
body = variable.scope.node.body
return if body.nil?
end
super
end
def message(variable)
message = String.new("Unused method argument - `#{variable.name}`.")
unless variable.keyword_argument?
message << " If it's necessary, use `_` or `_#{variable.name}` " \
"as an argument name to indicate that it won't be used."
end
scope = variable.scope
all_arguments = scope.variables.each_value.select(&:method_argument?)
if all_arguments.none?(&:referenced?)
message << " You can also write as `#{scope.name}(*)` " \
'if you want the method to accept any arguments ' \
"but don't care about them."
end
message
end
end
end
end
end
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