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require "action_view"
module Sprockets
module Helpers
module RailsHelper
extend ActiveSupport::Concern
include ActionView::Helpers::AssetTagHelper
def asset_paths
@asset_paths ||= begin
config = self.config if respond_to?(:config)
config ||= Rails.application.config
controller = self.controller if respond_to?(:controller)
paths = RailsHelper::AssetPaths.new(config, controller)
paths.asset_environment = asset_environment
paths.asset_prefix = asset_prefix
paths.asset_digests = asset_digests
paths.compile_assets = compile_assets?
paths.digest_assets = digest_assets?
paths.relative_url_root = config.action_controller.relative_url_root
paths
end
end
def javascript_include_tag(*sources)
options = sources.extract_options!
debug = options.key?(:debug) ? options.delete(:debug) : debug_assets?
body = options.key?(:body) ? options.delete(:body) : false
sources.collect do |source|
if debug && asset = asset_paths.asset_for(source, 'js')
asset.to_a.map { |dep|
super(dep.to_s, { :src => asset_path(dep, 'js', true) }.merge!(options))
}
else
super(source.to_s, { :src => asset_path(source, 'js', body) }.merge!(options))
end
end.join("\n").html_safe
end
def stylesheet_link_tag(*sources)
options = sources.extract_options!
debug = options.key?(:debug) ? options.delete(:debug) : debug_assets?
body = options.key?(:body) ? options.delete(:body) : false
sources.collect do |source|
if debug && asset = asset_paths.asset_for(source, 'css')
asset.to_a.map { |dep|
super(dep.to_s, { :href => asset_path(dep, 'css', true, :request) }.merge!(options))
}
else
super(source.to_s, { :href => asset_path(source, 'css', body, :request) }.merge!(options))
end
end.join("\n").html_safe
end
def asset_path(source, default_ext = nil, body = false, protocol = nil)
source = source.logical_path if source.respond_to?(:logical_path)
path = asset_paths.compute_public_path(source, 'assets', default_ext, true, protocol)
body ? "#{path}?body=1" : path
end
private
def debug_assets?
begin
compile_assets? &&
(Rails.application.config.assets.debug ||
params[:debug_assets] == '1' ||
params[:debug_assets] == 'true')
rescue NoMethodError
false
end
end
# Override to specify an alternative prefix for asset path generation.
# When combined with a custom +asset_environment+, this can be used to
# implement themes that can take advantage of the asset pipeline.
#
# If you only want to change where the assets are mounted, refer to
# +config.assets.prefix+ instead.
def asset_prefix
Rails.application.config.assets.prefix
end
def asset_digests
Rails.application.config.assets.digests
end
def compile_assets?
Rails.application.config.assets.compile
end
def digest_assets?
Rails.application.config.assets.digest
end
# Override to specify an alternative asset environment for asset
# path generation. The environment should already have been mounted
# at the prefix returned by +asset_prefix+.
def asset_environment
Rails.application.assets
end
class AssetPaths < ::ActionView::AssetPaths #:nodoc:
attr_accessor :asset_environment, :asset_prefix, :asset_digests, :compile_assets,
:digest_assets, :relative_url_root
class AssetNotPrecompiledError < StandardError; end
def compute_public_path(source, dir, ext = nil, include_host = true, protocol = nil)
public_path = super(source, asset_prefix, ext, include_host, protocol)
if !is_uri?(public_path) && relative_url_root
public_path = rewrite_relative_url_root(public_path, relative_url_root)
end
public_path
end
# Return the filesystem path for the source
def compute_source_path(source, ext)
asset_for(source, ext)
end
def asset_for(source, ext)
source = source.to_s
return nil if is_uri?(source)
source = rewrite_extension(source, nil, ext)
asset_environment[source]
end
def digest_for(logical_path)
if asset_digests && (digest = asset_digests[logical_path])
return digest
end
if compile_assets
if digest_assets && asset = asset_environment[logical_path]
return asset.digest_path
end
return logical_path
else
raise AssetNotPrecompiledError.new("#{logical_path} isn't precompiled")
end
end
def rewrite_asset_path(source, dir)
if source[0] == ?/
source
else
source = digest_for(source)
source = File.join(dir, source)
source = "/#{source}" unless source =~ /^\//
source
end
end
def rewrite_extension(source, dir, ext)
if ext && File.extname(source).empty?
"#{source}.#{ext}"
else
source
end
end
def relative_url_root
has_request? ? super : @relative_url_root
end
end
end
end
end
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