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-rw-r--r--lib/rake/file_task.rb47
1 files changed, 47 insertions, 0 deletions
diff --git a/lib/rake/file_task.rb b/lib/rake/file_task.rb
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+require 'rake/task.rb'
+require 'rake/early_time'
+
+module Rake
+ # #########################################################################
+ # A FileTask is a task that includes time based dependencies. If any of a
+ # FileTask's prerequisites have a timestamp that is later than the file
+ # represented by this task, then the file must be rebuilt (using the
+ # supplied actions).
+ #
+ class FileTask < Task
+
+ # Is this file task needed? Yes if it doesn't exist, or if its time stamp
+ # is out of date.
+ def needed?
+ ! File.exist?(name) || out_of_date?(timestamp)
+ end
+
+ # Time stamp for file task.
+ def timestamp
+ if File.exist?(name)
+ File.mtime(name.to_s)
+ else
+ Rake::EARLY
+ end
+ end
+
+ private
+
+ # Are there any prerequisites with a later time than the given time stamp?
+ def out_of_date?(stamp)
+ @prerequisites.any? { |n| application[n, @scope].timestamp > stamp}
+ end
+
+ # ----------------------------------------------------------------
+ # Task class methods.
+ #
+ class << self
+ # Apply the scope to the task name according to the rules for this kind
+ # of task. File based tasks ignore the scope when creating the name.
+ def scope_name(scope, task_name)
+ task_name
+ end
+ end
+ end
+end
+