Class: RailsGemChooser

Inherits:
Object
  • Object
show all
Defined in:
lib/rails_gem_chooser.rb

Overview

Rails gem chooser.

Selects RAILS_GEM_VERSION from ENV, or from RAILS_ROOT/config/environment.rb. Returns nil otherwise.

Class Method Summary collapse

Class Method Details

.__load(rails_gem_version = nil, config_file = nil) ⇒ Object

Either define rails_gem_version or config_file



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# File 'lib/rails_gem_chooser.rb', line 61

def __load(rails_gem_version=nil,config_file=nil)
  if (config_file and rails_gem_version) and (version != rails_gem_version)
    raise 'oops: Rails version mismatch'
  end

  rails_gem_version ||= version(config_file) # also detects ENV['RAILS_GEM_VERSION']

  #STDOUT.puts 'Loading Rails version %s' % rails_gem_version
  # the gem without underline will be removed in Rails3..
  #rails_gems = %w{ active_support action_pack active_record }
  # except that with the underline divider the gem is not found ..
  #rails_gems = %w{ activesupport actionpack activerecord }
  
  rails_gems = {
    # require name      gem name
    "active_support" => "activesupport",
    "action_pack"    => "actionpack",
    "active_record"  => "activerecord"
  }

  rails_gems.keys.each do |rg_key|
    __load_gem(rg_key, rails_gems[rg_key], rails_gem_version)
  end
  require 'action_controller' # action_controller lives in action_pack

  #STDOUT.puts "Loaded gems:"
  #STDOUT.puts "ActiveRecord: %s" % ActiveRecord::VERSION::STRING
  #STDOUT.puts "ActionPack: %s" %  ActionPack::VERSION::STRING
  #require 'active_support/version'
  #STDOUT.puts "ActiveSupport: %s" %  ActiveSupport::VERSION::STRING
end

.__load_gem(require_name, gem_name, version) ⇒ Object

Load a specific GEM



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# File 'lib/rails_gem_chooser.rb', line 50

def __load_gem(require_name, gem_name, version)
  #STDOUT.puts 'Loading gem: %s v %s' % [require_name, version]
  version ? gem(gem_name, '= '+version) : gem(gem_name)
  begin
    require require_name
  rescue LoadError
    require gem_name
  end
end

.version(config_file = nil) ⇒ Object 



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# File 'lib/rails_gem_chooser.rb', line 18

def version(config_file=nil)
  # detect from ENV
  if ENV['RAILS_GEM_VERSION']
    return ENV['RAILS_GEM_VERSION']
  elsif not config_file
    # load Rails config file
    if RAILS_ROOT
        config_file = File.join(
        File.expand_path(RAILS_ROOT),
          'config',
          'environment.rb'
          )
    else
      STDERR.puts 'Could not detect Rails version'
      return nil
    end
  end
  # don't attempt to load Rails if building a Rubygem..!
  if $0[/gem$/] or !File.exist?(config_file)
    return nil
  else
    # read from Rails config file
    f=File.open(config_file)
    config = f.read
    f.close
    rails_gem_version = config[/^RAILS_GEM_VERSION.*(\d\.\d\.\d+)/,1]
    #STDOUT.puts 'Detected Rails version %s from the config file %s' % [rails_gem_version,config_file]
    return rails_gem_version
  end
end