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- = Glossary
- [<b>action</b>]
- Code to be executed in order to perform a task. Actions in a
- rakefile are specified in a code block (usually delimited by
- +do+/+end+ pairs.
- [<b>execute</b>]
- When a task is executed, all of its actions are performed, in
- the order they were defined. Note that unlike
- <tt>invoke</tt>, <tt>execute</tt> always executes the actions
- (without invoking or executing the prerequisites).
- [<b>file task</b> (FileTask)]
- A file task is a task whose purpose is to create a file
- (which has the same name as the task). When invoked, a file
- task will only execute if one or more of the following
- conditions are true.
- 1. The associated file does not exist.
- 2. A prerequisite has a later time stamp than the existing file.
- Because normal Tasks always have the current time as
- timestamp, a FileTask that has a normal Task prerequisite
- will always execute.
- [<b>invoke</b>]
- When a task is invoked, first we check to see if it has been
- invoked before. if it has been, then nothing else is done.
- If this is the first time its been invoked, then we invoke
- each of its prerequisites. Finally, we check to see if we
- need to execute the actions of this task by calling
- <tt>needed?</tt>. Finally, if the task is needed, we execute
- its actions.
- NOTE: Currently prerequisites are invoked even if the task is
- not needed. This may change in the future.
- [<b>prerequisites</b>]
- Every task has a set (possibly empty) of prerequisites. A
- prerequisite P to Task T is itself a task that must be invoked
- before Task T.
- [<b>rule</b>]
- A rule is a recipe for synthesizing a task when no task is
- explicitly defined. Rules generally synthesize file tasks.
- [<b>task</b> (Task)]
- Basic unit of work in a rakefile. A task has a name, a set of
- prerequisites and a list of actions to be performed.
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