port_ruby_to_crystal' Initial commit. Date: 2022-11-02 18:53:05'

README.md

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+a Regex script for port ruby code to crystal, reduce friction.
+
+Include only the easiest, most obvious, and safest parts.
+
+only change the most easy part with minimum effort. 
+
+with minimal effort and cost.
+
+**Note:** Run this code at your own risk.
+
+# How to use it
+
+Entrying the projet folder, you should have renamed the extension .rb file
+to .cr for those in-place files.
+
+Before this step, it's a good idea to use rubocop to make some style changes.
+e.g. change all single-quoted strings to double-quoted strings.
+
+```sh
+$: ./port_ruby_to_crystal
+```
+
+# Run test
+
+```sh
+ ╰─ $ ./test.sh
+Running ruby test.rb successful.
+Running crystal run test.cr successful.
+```

port_ruby_to_crystal

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+#!/bin/env ruby
+
+def replace(code)
+  code.gsub!(/\bFile\.exist\?(\s*)/, 'File.exists?\1')
+  code.gsub!(/\bFile\.readlines\b/, 'File.read_lines')
+  code.gsub!(/\bYAML\.load\b/, 'YAML.parse')
+  code.gsub!(/require (?:'|")fileutils(?:'|")(\s*)/, 'require "file_utils"\1')
+  code.gsub!(/\.respond_to\?(\s*)/, '.responds_to?\1')
+  code.gsub!(/\brequire_relative\b/, 'require')
+  code.gsub!(/\.include\?(\s*)/, '.includes?\1')
+  code.gsub!(/\.end_with\?(\s*)/, '.ends_with?\1')
+  code.gsub!(/\.start_with\?(\s*)/, '.starts_with?\1')
+  code.gsub!(/(\w+\[.*?\]) \|\|/, '\1? ||')
+  code.gsub!(/\battr_accessor\b/, 'property')
+  code.gsub!(/\battr_reader\b/, 'getter')
+  code.gsub!(/\battr_writer\b/, 'setter')
+  code.gsub!("__dir__", '__DIR__')
+  code.gsub!(/(\()?(&):(\w+)(\))?/,  ' \2.\3')
+end
+
+if ARGV[0] == '--test'
+  code = File.read('test/test.rb')
+  replace(code)
+  File.write('test/test.cr', code)
+else
+  Dir.glob("**/*.cr").each do |cr_file|
+    code = File.read(cr_file)
+    replace(code)
+    File.write(cr_file, code)
+  end
+end

test.sh

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+#!/usr/bin/env sh
+
+set -e
+
+ruby test/test.rb && echo "Running ruby test.rb successful."
+chmod +x ./port_ruby_to_crystal
+./port_ruby_to_crystal --test
+crystal run test/test.cr && echo "Running crystal run test.cr successful."

test/test.cr

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+File.exists?("ruby")
+"hello".responds_to? :size
+require "./empty"
+
+arr = {"world" => 100}
+arr["hello"]? || "world"
+
+["hello", "world"].includes? "hello"
+
+class Test
+  property :test1
+  getter :test2
+  setter :test3
+end
+
+__DIR__
+
+["a", "b"].map &.upcase
+["a", "b"].map  &.upcase
+
+"hello".ends_with? "lo"
+"hello".starts_with? "he"
+
+File.read_lines("./test/test.rb")
+
+require "file_utils"
+require "file_utils"

test/test.rb

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+File.exist?("ruby")
+"hello".respond_to? :size
+require_relative "./empty"
+
+arr = {"world" => 100}
+arr["hello"] || "world"
+
+["hello", "world"].include? "hello"
+
+class Test
+  attr_accessor :test1
+  attr_reader :test2
+  attr_writer :test3
+end
+
+__dir__
+
+["a", "b"].map(&:upcase)
+["a", "b"].map &:upcase
+
+"hello".end_with? "lo"
+"hello".start_with? "he"
+
+File.readlines("./test/test.rb")
+
+require 'fileutils'
+require "fileutils"