Class: AssetWatcher

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

Constant Summary collapse

@@yaml_path = 
"config/asset_watch.yml"
@@attributes = 
%w|src_dir dest_dir|.map(&:to_sym).freeze
@@ext_map = 
{
  'coffee' => 'js',
  'haml'   => 'html',
}

Instance Method Summary collapse

Constructor Details

#initialize(config = {}) ⇒ AssetWatcher

Returns a new instance of AssetWatcher.



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# File 'lib/asset_watcher.rb', line 24

def initialize config = {}
  current_dir = `pwd`.strip
  default_config = {
    :src_dir => current_dir + "/src",
    :dest_dir => current_dir + "/public",
  }

  # configuration file
  yaml_path = current_dir + '/' + @@yaml_path
  if File.exist? yaml_path
    yaml_config = YAML.load_file yaml_path
    yaml_config.symbolize_keys!
    default_config.merge! yaml_config
  end

  @config = default_config.merge config
end

Instance Method Details

#compile(src_path) ⇒ Object 



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# File 'lib/asset_watcher.rb', line 55

def compile src_path
  if src_path =~ /\.(#{exts.join '|'})$/
    case $1
    when 'coffee' then compile_coffee src_path
    when 'haml'   then compile_haml   src_path
    end
  else
    false
  end
end

#compile_coffee(src_path) ⇒ Object 



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# File 'lib/asset_watcher.rb', line 66

def compile_coffee src_path
  return false unless File.exist? src_path and src_path =~ /\.coffee/

  dest_dir = File.dirname destination(src_path)
  puts "Compile '#{src_path}' to '#{dest_dir}'"

  if `which coffee`.blank?
    raise "'coffee' command is not found!"
  end

  `coffee -b -o #{dest_dir} #{src_path}`
  true
end

#compile_haml(src_path) ⇒ Object 



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# File 'lib/asset_watcher.rb', line 80

def compile_haml src_path
  return false unless File.exist? src_path and src_path =~ /\.haml/

  dest_path = destination src_path
  puts "Compile '#{src_path}' to '#{dest_path}'"

  # http://stackoverflow.com/questions/4549598/using-haml-with-custom-filters
  haml_engine = Haml::Engine.new File.read(src_path)

  dest_dir = File.dirname dest_path
  FileUtils.makedirs dest_dir unless File.directory? dest_dir

  File.open dest_path, 'w' do |file|
    file.write haml_engine.render
  end
  true
end

#destination(full_path) ⇒ Object 



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# File 'lib/asset_watcher.rb', line 46

def destination full_path
  if File.exist? full_path and full_path =~ /\.(#{exts.join '|'})/
    ext = $1
    relative_path = full_path.sub src_dir, ''
    relative_path.sub! /#{ext}$/, @@ext_map[ext]
    dest_dir + relative_path
  end
end

#exts ⇒ Object 



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# File 'lib/asset_watcher.rb', line 20

def exts
  @@ext_map.keys
end

#target_files ⇒ Object 



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# File 'lib/asset_watcher.rb', line 42

def target_files
  Dir[*exts.map { |ext| "#{src_dir}/**/*\.#{ext}" }]
end