document-more-complex-task-usecases #5816
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I also discovered a potential bug during this. If that is actually intended behavior, I can include it in the documentation |
lefou
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Sep 8, 2025
| @@ -23,6 +23,9 @@ def printFileData(fileName: String) = Task.Command { | |||
| // anywhere and passed around any way you want, until you finally make use of them | |||
| // within a downstream task or command. | |||
| // | |||
| // Anonymous tasks work well when parameters are known at task definition time. Dynamically | |||
| // generated inputs can not be used with Anonymous Tasks, as this would break caching. | |||
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"as this would break caching." is wrong. It's not about caching, but definition/dependency order.
Since we need to know the parameters before creating the task, but the tasks need to be created before we can start evaluation, we have a classic hen-or-egg problem.
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There are three strategies to resolve this:
- define the values outside of a task, so Mill knows how to create the anonymous tasks before evaluation starts
- put the value itself into a task, so it can be properly ordered to be evaluated before it's dependencies
- Make it not a task but a normal
def
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Improve the documentation around Anonymous Tasks, and give some extra examples of complex task usage.
addresses #5812