Class: RuboCop::Cop::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/rubocop/cop/generator.rb,
lib/rubocop/cop/generator/require_file_injector.rb,
lib/rubocop/cop/generator/configuration_injector.rb

Overview

Source and spec generator for new cops

This generator will take a cop name and generate a source file and spec file when given a valid qualified cop name.

Defined Under Namespace

Classes: ConfigurationInjector, RequireFileInjector

Constant Summary collapse

SOURCE_TEMPLATE =

Note: RDoc 5.1.0 or lower has the following issue. github.com/rubocop-hq/rubocop/issues/7043

The following ‘String#gsub` can be replaced with squiggly heredoc when RuboCop supports Ruby 2.5 or higher (RDoc 6.0 or higher).

<<-RUBY.gsub(/^ {8}/, '')
  # frozen_string_literal: true

  # TODO: when finished, run `rake generate_cops_documentation` to update the docs
  module RuboCop
    module Cop
      module %<department>s
        # TODO: Write cop description and example of bad / good code. For every
        # `SupportedStyle` and unique configuration, there needs to be examples.
        # Examples must have valid Ruby syntax. Do not use upticks.
        #
        # @example EnforcedStyle: bar (default)
        #   # Description of the `bar` style.
        #
        #   # bad
        #   bad_bar_method
        #
        #   # bad
        #   bad_bar_method(args)
        #
        #   # good
        #   good_bar_method
        #
        #   # good
        #   good_bar_method(args)
        #
        # @example EnforcedStyle: foo
        #   # Description of the `foo` style.
        #
        #   # bad
        #   bad_foo_method
        #
        #   # bad
        #   bad_foo_method(args)
        #
        #   # good
        #   good_foo_method
        #
        #   # good
        #   good_foo_method(args)
        #
        class %<cop_name>s < Cop
          # TODO: Implement the cop in here.
          #
          # In many cases, you can use a node matcher for matching node pattern.
          # See https://github.com/rubocop-hq/rubocop/blob/master/lib/rubocop/node_pattern.rb
          #
          # For example
          MSG = 'Use `#good_method` instead of `#bad_method`.'

          def_node_matcher :bad_method?, <<~PATTERN
            (send nil? :bad_method ...)
          PATTERN

          def on_send(node)
            return unless bad_method?(node)

            add_offense(node)
          end
        end
      end
    end
  end
RUBY
SPEC_TEMPLATE = 
<<~SPEC
  # frozen_string_literal: true

  RSpec.describe RuboCop::Cop::%<department>s::%<cop_name>s do
    subject(:cop) { described_class.new(config) }

    let(:config) { RuboCop::Config.new }

    # TODO: Write test code
    #
    # For example
    it 'registers an offense when using `#bad_method`' do
      expect_offense(<<~RUBY)
        bad_method
        ^^^^^^^^^^ Use `#good_method` instead of `#bad_method`.
      RUBY
    end

    it 'does not register an offense when using `#good_method`' do
      expect_no_offenses(<<~RUBY)
        good_method
      RUBY
    end
  end
SPEC
CONFIGURATION_ADDED_MESSAGE = 
<<~MESSAGE
  [modify] A configuration for the cop is added into %<configuration_file_path>s.
           If you want to disable the cop by default, set `Enabled` option to false.
MESSAGE

Instance Method Summary collapse

Constructor Details

#initialize(name, github_user, output: $stdout) ⇒ Generator

Returns a new instance of Generator.

Raises:

  • (ArgumentError) 


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# File 'lib/rubocop/cop/generator.rb', line 112

def initialize(name, github_user, output: $stdout)
  @badge = Badge.parse(name)
  @github_user = github_user
  @output = output
  return if badge.qualified?

  raise ArgumentError, 'Specify a cop name with Department/Name style'
end

Instance Method Details

#inject_config(config_file_path: 'config/default.yml') ⇒ Object 



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# File 'lib/rubocop/cop/generator.rb', line 136

def inject_config(config_file_path: 'config/default.yml')
  injector =
    ConfigurationInjector.new(configuration_file_path: config_file_path,
                              badge: badge,
                              version_added: bump_minor_version)

  injector.inject do
    output.puts(format(CONFIGURATION_ADDED_MESSAGE,
                       configuration_file_path: config_file_path))
  end
end

#inject_require(root_file_path: 'lib/rubocop.rb') ⇒ Object 



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# File 'lib/rubocop/cop/generator.rb', line 129

def inject_require(root_file_path: 'lib/rubocop.rb')
  RequireFileInjector.new(
    source_path: source_path,
    root_file_path: root_file_path
  ).inject
end

#todo ⇒ Object 



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# File 'lib/rubocop/cop/generator.rb', line 148

def todo
  <<~TODO
    Do 3 steps:
      1. Add an entry to the "New features" section in CHANGELOG.md,
         e.g. "Add new `#{badge}` cop. ([@#{github_user}][])"
      2. Modify the description of #{badge} in config/default.yml
      3. Implement your new cop in the generated file!
  TODO
end

#write_source ⇒ Object 



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# File 'lib/rubocop/cop/generator.rb', line 121

def write_source
  write_unless_file_exists(source_path, generated_source)
end

#write_spec ⇒ Object 



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# File 'lib/rubocop/cop/generator.rb', line 125

def write_spec
  write_unless_file_exists(spec_path, generated_spec)
end