add ruby/prefer-endless-method snippet

Author: flyerhzm

lib/ruby/prefer-endless-method.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+Synvert::Rewriter.new 'ruby', 'prefer-endless-method' do
+  configure(parser: Synvert::PRISM_PARSER)
+
+  description <<~EOS
+    It prefers endless method.
+
+    ```ruby
+    def one_plus_one
+      1 + 1
+    end
+    ```
+
+    =>
+
+    ```ruby
+    def one_plus_one = 1 + 1
+    ```
+  EOS
+
+  within_files Synvert::ALL_RUBY_FILES + Synvert::ALL_RAKE_FILES do
+    find_node '.def_node[body!=nil][body.body.length=1]' do
+      replace_with 'def {{name}} = {{body}}'
+    end
+  end
+end

spec/ruby/prefer-endless-method_spec.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Prefer endless method' do
+  let(:rewriter_name) { 'ruby/prefer-endless-method' }
+  let(:fake_file_path) { 'foobar.rb' }
+  let(:test_content) { <<~EOS }
+    def one_plus_one
+      1 + 1
+    end
+  EOS
+  let(:test_rewritten_content) { <<~EOS }
+    def one_plus_one = 1 + 1
+  EOS
+
+  include_examples 'convertable'
+end