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module Rails
module Generator
# Manifest captures the actions a generator performs. Instantiate
# a manifest with an optional target object, hammer it with actions,
# then replay or rewind on the object of your choice.
#
# Example:
# manifest = Manifest.new { |m|
# m.make_directory '/foo'
# m.create_file '/foo/bar.txt'
# }
# manifest.replay(creator)
# manifest.rewind(destroyer)
class Manifest
attr_reader :target
# Take a default action target. Yield self if block given.
def initialize(target = nil)
@target, @actions = target, []
yield self if block_given?
end
# Record an action.
def method_missing(action, *args, &block)
@actions << [action, args, block]
end
# Replay recorded actions.
def replay(target = nil)
send_actions(target || @target, @actions)
end
# Rewind recorded actions.
def rewind(target = nil)
send_actions(target || @target, @actions.reverse)
end
# Erase recorded actions.
def erase
@actions = []
end
private
def send_actions(target, actions)
actions.each do |method, args, block|
target.send(method, *args, &block)
end
end
end
end
end
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