Class: Goat::Autoreload

Inherits:
Object show all
Defined in:
lib/goat/autoreload.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(dir, interval) ⇒ Autoreload

Returns a new instance of Autoreload.



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# File 'lib/goat/autoreload.rb', line 46

def initialize(dir, interval)
  @dir = dir
  @interval = interval
  @cache = {}
end

Class Method Details

.command ⇒ Object 



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# File 'lib/goat/autoreload.rb', line 42

def self.command
  @command || "ruby #{$0} #{ARGV.join(' ')}" 
end

.command=(c) ⇒ Object 



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# File 'lib/goat/autoreload.rb', line 38

def self.command=(c)
  @command = c
end

.full_loadpaths ⇒ Object 



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# File 'lib/goat/autoreload.rb', line 5

def self.full_loadpaths
  paths = []

  $LOADED_FEATURES.each do |f|
    next if f =~ /\.(so|bundle)$/

    if f =~ /^\//
      paths << f
    else
      maybe = []
      $LOAD_PATH.each do |p|
        if File.exists?(File.join(p, f))
          maybe << File.expand_path(File.join(p, f))
        end
      end

      if maybe.empty?
        $stderr.puts "Couldn't find #{f}"
      elsif maybe.size > 1
        # ignore ambiguous files -- usually a gem or something
      else
        paths << maybe.first
      end
    end
  end
  
  paths
end

.schedule(dir, interval) ⇒ Object 



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# File 'lib/goat/autoreload.rb', line 34

def self.schedule(dir, interval)
  self.new(dir, interval).schedule
end

Instance Method Details

#filter_loadpaths ⇒ Object 



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# File 'lib/goat/autoreload.rb', line 52

def filter_loadpaths
  self.class.full_loadpaths.select {|f| f.downcase.start_with?(@dir.downcase)}
end

#maybe_reload ⇒ Object 



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# File 'lib/goat/autoreload.rb', line 72

def maybe_reload
  watchpaths.each do |path|
    if File.stat(path).mtime > @cache[path]
      $stderr.puts "Reloading after change in #{path}..."
      reload
    end
  end
end

#reload ⇒ Object 



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# File 'lib/goat/autoreload.rb', line 66

def reload
  EM.stop
  IO.closefrom(3)
  Kernel.exec(self.class.command)
end

#schedule ⇒ Object 



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# File 'lib/goat/autoreload.rb', line 81

def schedule
  update_cache
  EM.next_tick do
    EM.add_periodic_timer(@interval) do
      maybe_reload
    end
  end
end

#update_cache ⇒ Object 



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# File 'lib/goat/autoreload.rb', line 60

def update_cache
  watchpaths.each do |path|
    @cache[path] = File.stat(path).mtime
  end
end

#watchpaths ⇒ Object 



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# File 'lib/goat/autoreload.rb', line 56

def watchpaths
  @paths ||= filter_loadpaths
end