lean4-htt/Lake/Util/Log.lean

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/-
Copyright (c) 2021 Mac Malone. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Authors: Mac Malone
-/
import Lake.Util.Error
namespace Lake
inductive LogLevel
| info
| warning
| error
-- # Class
class MonadLog (m : Type u → Type v) where
log (message : String) (level : LogLevel) : m PUnit
export MonadLog (log)
abbrev logInfo [MonadLog m] (message : String) : m PUnit :=
log message .info
abbrev logWarning [MonadLog m] (message : String) : m PUnit :=
log message .warning
abbrev logError [MonadLog m] (message : String) : m PUnit :=
log message .error
namespace MonadLog
def nop [Pure m] : MonadLog m :=
⟨fun _ _ => pure ()⟩
instance [Pure m] : Inhabited (MonadLog m) := ⟨MonadLog.nop⟩
def io [MonadLiftT BaseIO m] : MonadLog m where
log msg
| .info => IO.println msg.trim |>.catchExceptions fun _ => pure ()
| .warning => IO.eprintln s!"warning: {msg.trim}" |>.catchExceptions fun _ => pure ()
| .error => IO.eprintln s!"error: {msg.trim}" |>.catchExceptions fun _ => pure ()
def eio [MonadLiftT BaseIO m] : MonadLog m where
log msg
| .info => IO.eprintln s!"info: {msg.trim}" |>.catchExceptions fun _ => pure ()
| .warning => IO.eprintln s!"warning: {msg.trim}" |>.catchExceptions fun _ => pure ()
| .error => IO.eprintln s!"error: {msg.trim}" |>.catchExceptions fun _ => pure ()
def lift [MonadLiftT m n] (self : MonadLog m) : MonadLog n where
log msg lv := liftM <| self.log msg lv
instance [MonadLift m n] [methods : MonadLog m] : MonadLog n := lift methods
/-- Log the given error message and then fail. -/
protected def error [Alternative m] [MonadLog m] (msg : String) : m α :=
logError msg *> failure
end MonadLog
-- # Transformers
abbrev MonadLogT (m : Type u → Type v) (n : Type v → Type w) :=
ReaderT (MonadLog m) n
instance [Pure n] [Inhabited α] : Inhabited (MonadLogT m n α) :=
⟨fun _ => pure Inhabited.default⟩
instance [Monad n] [MonadLiftT m n] : MonadLog (MonadLogT m n) where
log msg lv := do (← read).log msg lv
namespace MonadLogT
abbrev run (methods : MonadLog m) (self : MonadLogT m n α) : n α :=
ReaderT.run self methods
abbrev runWith (methods : MonadLog m) (self : MonadLogT m n α) : n α :=
ReaderT.run self methods
abbrev adaptMethods [Monad n]
(f : MonadLog m → MonadLog m') (self : MonadLogT m' n α) : MonadLogT m n α :=
ReaderT.adapt f self
end MonadLogT
abbrev LogT (m : Type → Type) :=
MonadLogT m m
namespace LogT
def run (methods : MonadLog m) (self : LogT m α) : m α :=
ReaderT.run self methods
def runWith (methods : MonadLog m) (self : LogT m α) : m α :=
ReaderT.run self methods
end LogT