84 lines
2.2 KiB
Text
84 lines
2.2 KiB
Text
/-
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Copyright (c) 2021 Mac Malone. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Mac Malone
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-/
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import Lake.Async
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namespace Lake
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-- # Tasks
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instance : Monad Task where
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map := Task.map
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pure := Task.pure
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bind := Task.bind
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abbrev ETask ε α := ExceptT ε Task α
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-- # IO Tasks
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def IOTask α := ETask IO.Error α
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instance : Monad IOTask := inferInstanceAs <| Monad (ETask IO.Error)
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namespace IOTask
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def spawn (act : IO α) (prio := Task.Priority.dedicated) : IO (IOTask α) :=
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IO.asTask act prio
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def await (self : IOTask α) : IO α := do
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IO.ofExcept (← IO.wait self)
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def mapAsync (f : α → IO β) (self : IOTask α) (prio := Task.Priority.dedicated) : IO (IOTask β) :=
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IO.mapTask (fun x => do let x ← IO.ofExcept x; f x) self prio
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def andThen (self : IOTask α) (act : IO β) (prio := Task.Priority.dedicated) : IO (IOTask β) :=
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IO.mapTask (fun x => IO.ofExcept x *> act) self prio
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instance : HAndThen (IOTask α) (IO β) (IO (IOTask β)) := ⟨andThen⟩
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def bindAsync (self : IOTask α) (f : α → IO (IOTask β)) (prio := Task.Priority.dedicated) : IO (IOTask β) :=
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IO.bindTask self (fun x => do let x ← IO.ofExcept x; f x) prio
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instance : MonadAsync IO IOTask where
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async := IOTask.spawn
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await := IOTask.await
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mapAsync := IOTask.mapAsync
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bindAsync := IOTask.bindAsync
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end IOTask
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-- # Build Task
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def BuildTask := IOTask PUnit
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namespace BuildTask
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def nop : BuildTask :=
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Task.pure (Except.ok ())
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def spawn (act : IO PUnit) (prio := Task.Priority.dedicated) : IO BuildTask :=
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IO.asTask act prio
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def all (tasks : List BuildTask) (prio := Task.Priority.dedicated) : IO BuildTask :=
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IO.asTask (tasks.forM (·.await)) prio
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end BuildTask
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instance : Inhabited BuildTask := ⟨BuildTask.nop⟩
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def afterTaskList (tasks : List BuildTask) (act : IO PUnit) : IO BuildTask :=
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afterListAsync (async act) tasks
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def afterTaskArray (tasks : Array BuildTask) (act : IO PUnit) : IO BuildTask :=
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afterArrayAsync (async act) tasks
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instance : HAndThen BuildTask (IO PUnit) (IO BuildTask) :=
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⟨IOTask.andThen⟩
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instance : HAndThen (List BuildTask) (IO PUnit) (IO BuildTask) :=
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⟨afterTaskList⟩
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instance : HAndThen (Array BuildTask) (IO PUnit) (IO BuildTask) :=
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⟨afterTaskArray⟩
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