Charyf/charyf-core

# frozen_string_literal: true

require 'pathname'

module Charyf
  module AppLoader # :nodoc:
    extend self

    RUBY = Gem.ruby
    EXECUTABLES = %w(bin/charyf charyf/bin/charyf)

    def exec_app
      original_cwd = Dir.pwd

      loop do
        if exe = find_executable
          contents = File.read(exe)

          if contents =~ /(APP|ENGINE)_PATH/
            exec RUBY, exe, *ARGV
            break # non reachable, hack to be able to stub exec in the test suite
          end
        end

        # If we exhaust the search there is no executable, this could be a
        # call to generate a new application, so restore the original cwd.
        Dir.chdir(original_cwd) && return if Pathname.new(Dir.pwd).root?

        # Otherwise keep moving upwards in search of an executable.
        Dir.chdir("..")
      end
    end

    def find_executable
      EXECUTABLES.find { |exe| File.file?(exe) }
    end
  end
end