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require 'rake'
require 'rake/tasklib'
require 'sprockets'
require 'logger'
module Rake
# Simple Sprockets compilation Rake task macro.
#
# Rake::SprocketsTask.new do |t|
# t.environment = Sprockets::Environment.new
# t.output = "./public/assets"
# t.assets = %w( application.js application.css )
# end
#
class SprocketsTask < Rake::TaskLib
# Name of the task. Defaults to "assets".
#
# The name will also be used to suffix the clean and clobber
# tasks, "clean_assets" and "clobber_assets".
attr_accessor :name
# `Environment` instance used for finding assets.
#
# You'll most likely want to reassign `environment` to your own.
#
# Rake::SprocketsTask.new do |t|
# t.environment = Foo::Assets
# end
#
def environment
if !@environment.is_a?(Sprockets::Base) && @environment.respond_to?(:call)
@environment = @environment.call
else
@environment
end
end
attr_writer :environment
# Returns cached cached environment
def cached
@cached ||= environment.cached if environment
end
alias_method :index, :cached
# `Manifest` instance used for already compiled assets.
#
# Will be created by default if an environment and output
# directory are given
def manifest
if !@manifest.is_a?(Sprockets::Manifest) && @manifest.respond_to?(:call)
@manifest = @manifest.call
else
@manifest
end
end
attr_writer :manifest
# Directory to write compiled assets too. As well as the manifest file.
#
# t.output = "./public/assets"
#
attr_accessor :output
# Array of asset logical paths to compile.
#
# t.assets = %w( application.js jquery.js application.css )
#
attr_accessor :assets
# Number of old assets to keep.
attr_accessor :keep
# Logger to use during rake tasks. Defaults to using stderr.
#
# t.logger = Logger.new($stdout)
#
attr_accessor :logger
# Returns logger level Integer.
def log_level
@logger.level
end
# Set logger level with constant or symbol.
#
# t.log_level = Logger::INFO
# t.log_level = :debug
#
def log_level=(level)
if level.is_a?(Integer)
@logger.level = level
else
@logger.level = Logger.const_get(level.to_s.upcase)
end
end
def initialize(name = :assets)
@name = name
@environment = lambda { Sprockets::Environment.new(Dir.pwd) }
@manifest = lambda { Sprockets::Manifest.new(cached, output) }
@logger = Logger.new($stderr)
@logger.level = Logger::INFO
@keep = 2
yield self if block_given?
define
end
# Define tasks
def define
desc name == :assets ? "Compile assets" : "Compile #{name} assets"
task name do
with_logger do
manifest.compile(assets)
end
end
desc name == :assets ? "Remove all assets" : "Remove all #{name} assets"
task "clobber_#{name}" do
with_logger do
manifest.clobber
end
end
task :clobber => ["clobber_#{name}"]
desc name == :assets ? "Clean old assets" : "Clean old #{name} assets"
task "clean_#{name}" do
with_logger do
manifest.clean(keep)
end
end
task :clean => ["clean_#{name}"]
end
private
# Sub out environment logger with our rake task logger that
# writes to stderr.
def with_logger
if env = manifest.environment
old_logger = env.logger
env.logger = @logger
end
yield
ensure
env.logger = old_logger if env
end
end
end
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