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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Rails
# This cop checks for the use of output calls like puts and print
#
# @example
# # bad
# puts 'A debug message'
# pp 'A debug message'
# print 'A debug message'
#
# # good
# Rails.logger.debug 'A debug message'
class Output < Cop
MSG = 'Do not write to stdout. ' \
"Use Rails's logger if you want to log.".freeze
def_node_matcher :output?, <<-PATTERN
(send nil? {:ap :p :pp :pretty_print :print :puts} ...)
PATTERN
def_node_matcher :io_output?, <<-PATTERN
(send
{
(gvar #match_gvar?)
{(const nil? :STDOUT) (const nil? :STDERR)}
}
{:binwrite :syswrite :write :write_nonblock}
...)
PATTERN
def on_send(node)
return unless (output?(node) || io_output?(node)) &&
node.arguments?
add_offense(node, location: :selector)
end
private
def match_gvar?(sym)
%i[$stdout $stderr].include?(sym)
end
end
end
end
end
Version data entries
6,879 entries across 6,875 versions & 24 rubygems