Module: Disco::AppDiscoLoader

Defined in:
lib/disco/app_disco_loader.rb

Constant Summary collapse

RUBY = 
File.join(*RbConfig::CONFIG.values_at('bindir', 'ruby_install_name')) + RbConfig::CONFIG['EXEEXT']
EXECUTABLES = 
['bin/disco']
BUNDLER_WARNING = 
<<EOS
Looks like your app's ./bin/disco is a stub that was generated by Bundler.

In Rails Disco, your app's bin/ directory contains executables that are versioned
like any other source code, rather than stubs that are generated on demand.

Here's how to upgrade:

  bundle config --delete bin    # Turn off Bundler's stub generator
  rake disco:update:bin        # Use the new Rails Disco executables
  git add bin                   # Add bin/ to source control

You may need to remove bin/ from your .gitignore as well.

When you install a gem whose executable you want to use in your app,
generate it and add it to source control:

  bundle binstubs some-gem-name
  git add bin/new-executable

EOS

Class Method Summary collapse

Class Method Details

.exec_app_disco ⇒ Object 



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# File 'lib/disco/app_disco_loader.rb', line 29

def self.exec_app_disco
  original_cwd = Dir.pwd

  loop do
    exe = find_executable
    if exe
      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
      elsif exe.end_with?('bin/disco') && contents.include?('This file was generated by Bundler')
        $stderr.puts(BUNDLER_WARNING)
        Object.const_set(:APP_PATH, File.expand_path('config/application', Dir.pwd))
        require File.expand_path('../boot', APP_PATH)
        require 'disco/commands'
        break
      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.
    if Pathname.new(Dir.pwd).root?
      Dir.chdir(original_cwd)
      break
    end

    # Otherwise keep moving upwards in search of a executable.
    Dir.chdir('..')
  end
end

.find_executable ⇒ Object 



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# File 'lib/disco/app_disco_loader.rb', line 61

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