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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop identifies places where `$stderr.puts` can be replaced by
# `warn`. The latter has the advantage of easily being disabled by,
# the `-W0` interpreter flag or setting `$VERBOSE` to `nil`.
#
# @example
# # bad
# $stderr.puts('hello')
#
# # good
# warn('hello')
#
class StderrPuts < Cop
include RangeHelp
MSG = 'Use `warn` instead of `$stderr.puts` to allow such output ' \
'to be disabled.'.freeze
def_node_matcher :stderr_puts?, <<-PATTERN
(send
(gvar #stderr_gvar?) :puts $_
...)
PATTERN
def on_send(node)
return unless stderr_puts?(node)
add_offense(node, location: stderr_puts_range(node))
end
def autocorrect(node)
lambda do |corrector|
corrector.replace(stderr_puts_range(node), 'warn')
end
end
private
def stderr_gvar?(sym)
sym == :$stderr
end
def stderr_puts_range(send)
range_between(
send.loc.expression.begin_pos,
send.loc.selector.end_pos
)
end
end
end
end
end
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