module RequireAll

Public Instance Methods

autoload_all(*paths) click to toggle source

Performs Kernel#autoload on all of the files rather than requiring immediately.

Note that all Ruby files inside of the specified directories should have same module name as the directory itself and file names should reflect the class/module names. For example if there is a my_file.rb in directories dir1/dir2/ then there should be a declaration like this in my_file.rb:

 module Dir1
   module Dir2
     class MyFile
       ...
     end
   end
end

If the filename and namespaces won't match then my_file.rb will be loaded into wrong module! Better to fix these files.

Set $DEBUG=true to see how files will be autoloaded if experiencing any problems.

If trying to perform autoload on some individual file or some inner module, then you'd have to always specify :base_dir option to specify where top-level namespace resides. Otherwise it's impossible to know the namespace of the loaded files.

For example loading only my_file.rb from dir1/dir2 with #autoload_all:

autoload_all File.dirname(__FILE__) + '/dir1/dir2/my_file',
             :base_dir => File.dirname(__FILE__) + '/dir1'

WARNING: All modules will be created even if files themselves aren't loaded yet, meaning that all the code which depends of the modules being loaded or not will not work, like usages of define? and it's friends.

Also, normal caveats of using Kernel#autoload apply - you have to remember that before applying any monkey-patches to code using autoload, you'll have to reference the full constant to load the code before applying your patch!

# File lib/require_all.rb, line 211
def autoload_all(*paths)
  paths.flatten!
  return false if paths.empty?
  require "pathname"

  options = {:method => :autoload}
  options.merge!(paths.pop) if paths.last.is_a?(Hash)

  paths.each do |path|
    require_all path, {:base_dir => path}.merge(options)
  end
end
autoload_rel(*paths) click to toggle source

Performs autoloading relatively from the caller instead of using current working directory

# File lib/require_all.rb, line 225
def autoload_rel(*paths)
  paths.flatten!
  return false if paths.empty?
  require "pathname"

  options = {:method => :autoload}
  options.merge!(paths.pop) if paths.last.is_a?(Hash)

  source_directory = File.dirname caller.first.sub(/:\d+$/, '')
  paths.each do |path|
    file_path = Pathname.new(source_directory).join(path).to_s
    require_all file_path, {:method => :autoload,
                            :base_dir => source_directory}.merge(options)
  end
end
load_all(*paths) click to toggle source

Loads all files like #require_all instead of requiring

# File lib/require_all.rb, line 159
def load_all(*paths)
  require_all paths, :method => :load
end
load_rel(*paths) click to toggle source

Loads all files by using relative paths of the caller rather than the current working directory

# File lib/require_all.rb, line 165
def load_rel(*paths)
  paths.flatten!
  return false if paths.empty?

  source_directory = File.dirname caller.first.sub(/:\d+$/, '')
  paths.each do |path|
    require_all File.join(source_directory, path), :method => :load
  end
end
require_all(*args) click to toggle source

A wonderfully simple way to load your code.

The easiest way to use #require_all is to just point it at a directory containing a bunch of .rb files. These files can be nested under subdirectories as well:

require_all 'lib'

This will find all the .rb files under the lib directory and load them. The proper order to load them in will be determined automatically.

If the dependencies between the matched files are unresolvable, it will throw the first unresolvable NameError.

You can also give it a glob, which will enumerate all the matching files:

require_all 'lib   /*.rb'

It will also accept an array of files:

require_all Dir.glob("blah/   *.rb").reject { |f| stupid_file(f) }

Or if you want, just list the files directly as arguments:

require_all 'lib/a.rb', 'lib/b.rb', 'lib/c.rb', 'lib/d.rb'
# File lib/require_all.rb, line 34
def require_all(*args)
  # Handle passing an array as an argument

  args.flatten!

  options = {:method => :require}
  options.merge!(args.pop) if args.last.is_a?(Hash)

  if args.empty?
    puts "no files were loaded due to an empty Array" if $DEBUG
    return false
  end

  if args.size > 1
    # Expand files below directories

    files = args.map do |path|
      if File.directory? path
        Dir[File.join(path, '**', '*.rb')]
      else
        path
      end
    end.flatten
  else
    arg = args.first
    begin
      # Try assuming we're doing plain ol' require compat

      stat = File.stat(arg)

      if stat.file?
        files = [arg]
      elsif stat.directory?
        files = Dir.glob File.join(arg, '**', '*.rb')
      else
        raise ArgumentError, "#{arg} isn't a file or directory"
      end
    rescue SystemCallError
      # If the stat failed, maybe we have a glob!

      files = Dir.glob arg

      # Maybe it's an .rb file and the .rb was omitted

      if File.file?(arg + '.rb')
        file = arg + '.rb'
        options[:method] != :autoload ? Kernel.send(options[:method], file) : __autoload(file, file, options)
        return true
      end

      # If we ain't got no files, the glob failed

      raise LoadError, "no such file to load -- #{arg}" if files.empty?
    end
  end

  # If there's nothing to load, you're doing it wrong!

  raise LoadError, "no files to load" if files.empty?

  if options[:method] == :autoload
    files.map! { |file| [file, File.expand_path(file)] }
    files.each do |file, full_path|
      __autoload(file, full_path, options)
    end

    return true
  end

  files.map! { |file| File.expand_path file }
  files.sort!

  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
        Kernel.send(options[:method], 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 unless ex.message["is not missing constant"]

        STDERR.puts "Warning: require_all 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
require_rel(*paths) click to toggle source

Works like #require_all, but paths are relative to the caller rather than the current working directory

# File lib/require_all.rb, line 147
def require_rel(*paths)
  # Handle passing an array as an argument

  paths.flatten!
  return false if paths.empty?

  source_directory = File.dirname caller.first.sub(/:\d+$/, '')
  paths.each do |path|
    require_all File.join(source_directory, path)
  end
end

Private Instance Methods

__autoload(file, full_path, options) click to toggle source
# File lib/require_all.rb, line 243
def __autoload(file, full_path, options)
  last_module = "Object" # default constant where namespaces are created into

  begin
    base_dir = Pathname.new(options[:base_dir]).realpath
  rescue Errno::ENOENT
    raise LoadError, ":base_dir doesn't exist at #{options[:base_dir]}"
  end
  Pathname.new(file).realpath.descend do |entry|
    # skip until *entry* is same as desired directory

    # or anything inside of it avoiding to create modules

    # from the top-level directories

    next if (entry <=> base_dir) < 0

    # get the module into which a new module is created or

    # autoload performed

    mod = Object.class_eval(last_module)

    without_ext = entry.basename(entry.extname).to_s
    const = without_ext.split("_").map {|word| word.capitalize}.join

    if entry.directory?
      mod.class_eval "module #{const} end"
      last_module += "::#{const}"
    else
      mod.class_eval do
        puts "autoloading #{mod}::#{const} from #{full_path}" if $DEBUG
        autoload const, full_path
      end
    end
  end
end