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require 'rake/file_task'
require 'rake/early_time'
module Rake
# A FileCreationTask is a file task that when used as a dependency will be
# needed if and only if the file has not been created. Once created, it is
# not re-triggered if any of its dependencies are newer, nor does trigger
# any rebuilds of tasks that depend on it whenever it is updated.
#
class FileCreationTask < FileTask
# Is this file task needed? Yes if it doesn't exist.
def needed?
! File.exist?(name)
end
# Time stamp for file creation task. This time stamp is earlier
# than any other time stamp.
def timestamp
Rake::EARLY
end
end
end
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