Module: LoadGlob

Defined in:
lib/load_glob.rb

Overview

– Copyright ©2009 Tony Arcieri You can redistribute this under the terms of the MIT license See file LICENSE for details ++

Instance Method Summary collapse

Instance Method Details

#load_glob(glob) ⇒ Object

Load all files matching the given glob, handling dependencies between the files gracefully



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# File 'lib/load_glob.rb', line 10

def load_glob(glob)
  files = Dir[glob].map { |file| File.expand_path file }
          
  begin
    failed = []
    first_name_error = nil
    
    # Attempt to load each file, rescuing which ones raise NameError for
    # undefined constants.  Keep trying to successively reload files that 
    # previously caused NameErrors until they've all been loaded or no new
    # files can be loaded, indicating unresolvable dependencies.
    files.each do |file|
      begin
        require file
      rescue NameError => ex
        failed << file
        first_name_error ||= ex
      rescue ArgumentError => ex
        # Work around ActiveSuport freaking out... *sigh*
        #
        # ActiveSupport sometimes throws these exceptions and I really
        # have no idea why.  Code loading will work successfully if these
        # exceptions are swallowed, although I've run into strange 
        # nondeterministic behaviors with constants mysteriously vanishing.
        # I've gone spelunking through dependencies.rb looking for what 
        # exactly is going on, but all I ended up doing was making my eyes 
        # bleed.
        #
        # FIXME: If you can understand ActiveSupport's dependencies.rb 
        # better than I do I would *love* to find a better solution
        raise ex unless ex["is not missing constant"]
        STDERR.puts "Warning: load_glob swallowed ActiveSupport 'is not missing constant' error"
        STDERR.puts ex.backtrace[0..9]
      end
    end
    
    # If this pass didn't resolve any NameErrors, we've hit an unresolvable
    # dependency, so raise one of the exceptions we encountered.
    if failed.size == files.size
      raise first_name_error
    else
      files = failed
    end
  end until failed.empty?
  
  true
end