Pack Ruby

ruby2pack.rb

require 'fileutils'

class Ruby2Pack
  attr_reader :source_path, :ruby_version, :platform, :rel, :output_path

  def initialize(source_path:, ruby_version:, platform:, rel:)
    @source_path = source_path
    @ruby_version = ruby_version
    @platform = platform
    @rel = rel
    @output_path = "#{__dir__}/dist/#{platform}-#{ruby_version}-#{rel}"
  end

  def run
    mk_dist_dir
    create_application_loader_file
    copy_files
    download_traveling_ruby
    install_gems
    create_runnable_script
  end

  private

  def mk_dist_dir
    FileUtils.makedirs output_path unless File.directory? output_path
  end

  def create_application_loader_file
    File.write(
      "#{output_path}/run.rb",
      <<~RUBY
        ENV['BUNDLE_GEMFILE'] ||= File.join("#{output_path}", "Gemfile")

        require 'bundler/setup'

        require File.join("#{output_path}", "main.rb")
      RUBY
    )
  end

  def copy_files
    Dir.glob("#{source_path}/*").each do |file|
      FileUtils.cp_r file, output_path
    end
  end

  def download_traveling_ruby
    url = "https://github.com/YOU54F/traveling-ruby/releases/download/rel-#{rel}/traveling-ruby-#{rel}-#{ruby_version}-#{platform}.tar.gz"

    `curl -L #{url} | tar xz -C #{output_path}`
  end

  def install_gems
    `BUNDLE_GEMFILE="#{output_path}/Gemfile" #{output_path}/bin/bundle install --path #{output_path}/gems`
  end

  def create_runnable_script
    File.write(
      "#{output_path}/run",
      <<~SH
        #!/usr/bin/env bash

        DIRNAME=$(dirname -- "$0")

        GEMFILE_PATH="$DIRNAME/Gemfile" "$DIRNAME/bin/ruby" "$DIRNAME/run.rb"
      SH
    )

    FileUtils.chmod 'a+x', "#{output_path}/run"
  end
end

# Usage:
#
# source_path: The path to the source files
# ruby_version: The version of Ruby to use
# platform: The platform to target
# rel: The release of Ruby to use

# Example
# Ruby2Pack.new(source_path: 'example', ruby_version: '3.3.0', platform: 'osx-arm64', rel: '20240215').run