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Contents
require 'action_view'
module Landable
module Liquid
class AssetTag < ::Liquid::Tag
attr_accessor :tag_name, :asset_name
# we'll be calling up to methods in here
include ActionView::Helpers::AssetTagHelper
# included for asset digest support
include Sprockets::Rails::Helper
def initialize(tag_name, param, tokens)
@tag_name = tag_name
@asset_name = param.strip
@tokens = tokens
end
def render(context)
tag_method = tag_name.to_sym
tag_method = :image_tag if tag_method == :img_tag
# if this matches an application asset, use that
if assets_environment[asset_name]
send tag_method, asset_name
# otherwise, find an asset of our own
else
asset = lookup_asset context, asset_name
options = {}
options[:alt] = asset.description if tag_method == :image_tag
send tag_method, asset.public_url, options
end
end
protected
def lookup_asset(context, name)
assets = context.registers.fetch(:assets) do
raise ArgumentError.new("`assets' value was never registered with the template")
end
assets.fetch(name) do
raise ArgumentError.new("No `#{name}' asset available in #{assets.inspect}")
end
end
# stuff for sprockets
delegate :assets_prefix, :digest_assets, to: 'ActionView::Base'
# ActionView::Base.assets_environment will be nil if the pipeline is
# disabled - use this instead
def assets_environment
Rails.application.assets
end
end
class AssetAttributeTag < AssetTag
def render(context)
asset = lookup_asset context, asset_name
attribute = tag_name.sub /^asset_/, ''
if attribute == 'url'
asset.public_url
else
asset.send attribute
end
end
end
end
end
Version data entries
16 entries across 16 versions & 1 rubygems