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module Plate
# Callbacks are used to extend the base functionality of Plate. You might want to create
# some dynamic pages after all posts have been loaded (such as a blog archives view) or
# clean up some page output after it is rendered but before it is written to disk. Callbacks
# are the best way to achieve these and other common use cases.
#
# Callbacks must be registered with an object to be used. If you generated a new site
# using the `plate new .` or `platify` command, you should see an example callbacks file
# in `lib/callbacks.rb`.
#
module Callbacks
def self.included(base)
base.send(:include, InstanceMethods)
base.send(:extend, ClassMethods)
end
module ClassMethods
# All of the callbacks that have been registered.
def callbacks
@callbacks ||= {}
end
# Register a new callback
#
# @example
# Plate::Page.register_callback(:after_render) do |page|
# puts "Rendered page! #{page.path}"
# end
def register_callback(name, method_name = nil, &block)
callbacks[name] ||= []
callbacks[name] << (block || method_name)
end
end
module InstanceMethods
def around_callback(name, &block)
run_callback "before_#{name}".to_sym
block.call
run_callback "after_#{name}".to_sym
end
def run_callback(name)
if callbacks = self.class.callbacks[name]
callbacks.each do |callback|
if Proc === callback
callback.call(self)
elsif self.respond_to?(callback)
self.send(callback)
end
end
end
end
end
end
end
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18 entries across 18 versions & 1 rubygems