Lake Traces

This module defines Lake traces and associated utilities. Traces are used to determine whether a Lake build artifact is dirty (needs to be rebuilt) or is already up-to-date. The primary type is Lake.BuildTrace.

Utilities

class Lake.CheckExists (i : Type u) : Type u

• checkExists : i → BaseIO Bool

  Check whether there already exists an artifact for the given target info.

instance Lake.instCheckExistsFilePath : Lake.CheckExists System.FilePath

Trace Abstraction

class Lake.ComputeTrace (α : Type u) (m : outParam (Type v → Type w)) (τ : Type v) : Type (max u w)

• computeTrace : α → m τ

  Compute the trace of an object in its preferred monad.

@[inline]

def Lake.computeTrace {α : Type u_1} {m : Type u_2 → Type u_3} {τ : Type u_2} {n : Type u_2 → Type u_4} [Lake.ComputeTrace α m τ] [MonadLiftT m n] (a : α) : n τ

Compute the trace of an object in a supporting monad.

class Lake.NilTrace (α : Type u) : Type u

• nilTrace : α

  The nil trace. Should not unduly clash with a proper trace.

instance Lake.inhabitedOfNilTrace {α : Type u_1} [Lake.NilTrace α] : Inhabited α

class Lake.MixTrace (α : Type u) : Type u

• mixTrace : α → α → α

  Combine two traces. The result should be dirty if either of the inputs is dirty.

def Lake.mixTraceList {τ : Type u_1} [Lake.MixTrace τ] [Lake.NilTrace τ] (traces : List τ) : τ

Equations

• Lake.mixTraceList traces = List.foldl Lake.mixTrace Lake.nilTrace traces

def Lake.mixTraceArray {τ : Type u_1} [Lake.MixTrace τ] [Lake.NilTrace τ] (traces : Array τ) : τ

Equations

• Lake.mixTraceArray traces = Array.foldl Lake.mixTrace Lake.nilTrace traces

@[inline]

def Lake.computeListTrace {τ : Type u_1} {α : Type u_2} {m : Type u_1 → Type u_3} [Lake.MixTrace τ] [Lake.NilTrace τ] [Lake.ComputeTrace α m τ] {n : Type u_1 → Type u_4} [MonadLiftT m n] [Monad n] (as : List α) : n τ

Equations

• Lake.computeListTrace as = List.foldlM (fun (ts : τ) (t : α) => do let __do_lift ← Lake.computeTrace t pure (Lake.mixTrace ts __do_lift)) Lake.nilTrace as

instance Lake.instComputeTraceListOfMonad {τ : Type u_1} {α : Type u_2} {m : Type u_1 → Type u_3} [Lake.MixTrace τ] [Lake.NilTrace τ] [Lake.ComputeTrace α m τ] [Monad m] : Lake.ComputeTrace (List α) m τ

@[inline]

def Lake.computeArrayTrace {τ : Type u_1} {α : Type u_2} {m : Type u_1 → Type u_3} [Lake.MixTrace τ] [Lake.NilTrace τ] [Lake.ComputeTrace α m τ] {n : Type u_1 → Type u_4} [MonadLiftT m n] [Monad n] (as : Array α) : n τ

Equations

• Lake.computeArrayTrace as = Array.foldlM (fun (ts : τ) (t : α) => do let __do_lift ← Lake.computeTrace t pure (Lake.mixTrace ts __do_lift)) Lake.nilTrace as

instance Lake.instComputeTraceArrayOfMonad {τ : Type u_1} {α : Type u_2} {m : Type u_1 → Type u_3} [Lake.MixTrace τ] [Lake.NilTrace τ] [Lake.ComputeTrace α m τ] [Monad m] : Lake.ComputeTrace (Array α) m τ

Equations

• Lake.instComputeTraceArrayOfMonad = { computeTrace := Lake.computeArrayTrace }

Hash Trace

structure Lake.Hash : Type

A content hash.

• val : UInt64

instance Lake.instBEqHash : BEq Lake.Hash

Equations

• Lake.instBEqHash = { beq := Lake.beqHash✝ }

instance Lake.instDecidableEqHash : DecidableEq Lake.Hash

Equations

• Lake.instDecidableEqHash = Lake.decEqHash✝

instance Lake.instReprHash : Repr Lake.Hash

@[inline]

def Lake.Hash.ofNat (n : Nat) : Lake.Hash

def Lake.Hash.ofString? (s : String) : Option Lake.Hash

Equations

• Lake.Hash.ofString? s = Option.map Lake.Hash.ofNat (inline s.toNat?)

def Lake.Hash.load? (hashFile : System.FilePath) : BaseIO (Option Lake.Hash)

Equations

• Lake.Hash.load? hashFile = EIO.catchExceptions (Lake.Hash.ofString? <$> IO.FS.readFile hashFile) fun (x : IO.Error) => pure none

def Lake.Hash.nil : Lake.Hash

instance Lake.Hash.instNilTrace : Lake.NilTrace Lake.Hash

Equations

• Lake.Hash.instNilTrace = { nilTrace := Lake.Hash.nil }

@[inline]

def Lake.Hash.mix (h1 h2 : Lake.Hash) : Lake.Hash

Equations

• h1.mix h2 = { val := mixHash h1.val h2.val }

instance Lake.Hash.instMixTrace : Lake.MixTrace Lake.Hash

Equations

• Lake.Hash.instMixTrace = { mixTrace := Lake.Hash.mix }

@[inline]

def Lake.Hash.toString (self : Lake.Hash) : String

Equations

• self.toString = toString self.val

instance Lake.Hash.instToString : ToString Lake.Hash

Equations

• Lake.Hash.instToString = { toString := Lake.Hash.toString }

@[inline]

def Lake.Hash.ofString (str : String) : Lake.Hash

@[inline]

def Lake.Hash.ofByteArray (bytes : ByteArray) : Lake.Hash

@[inline]

def Lake.Hash.toJson (self : Lake.Hash) : Lean.Json

Equations

• self.toJson = Lean.toJson self.val

instance Lake.Hash.instToJson : Lean.ToJson Lake.Hash

@[inline]

def Lake.Hash.fromJson? (json : Lean.Json) : Except String Lake.Hash

instance Lake.Hash.instFromJson : Lean.FromJson Lake.Hash

Equations

• Lake.Hash.instFromJson = { fromJson? := Lake.Hash.fromJson? }

class Lake.ComputeHash (α : Type u) (m : outParam (Type → Type v)) : Type (max u v)

• computeHash : α → m Lake.Hash

  Compute the hash of an object in its preferred monad.

instance Lake.instComputeTraceHashOfComputeHash {α : Type u_1} {m : Type → Type u_2} [Lake.ComputeHash α m] : Lake.ComputeTrace α m Lake.Hash

@[inline]

def Lake.pureHash {α : Type u_1} [Lake.ComputeHash α Id] (a : α) : Lake.Hash

Compute the hash of object a in a pure context.

Equations

• Lake.pureHash a = Lake.ComputeHash.computeHash a

@[inline]

def Lake.computeHash {α : Type u_1} {m : Type → Type u_2} {n : Type → Type u_3} [Lake.ComputeHash α m] [MonadLiftT m n] (a : α) : n Lake.Hash

Compute the hash an object in an supporting monad.

Equations

• Lake.computeHash a = liftM (Lake.ComputeHash.computeHash a)

instance Lake.instComputeHashStringId : Lake.ComputeHash String Id

def Lake.computeBinFileHash (file : System.FilePath) : IO Lake.Hash

Compute the hash of a binary file. Binary files are equivalent only if they are byte identical.

instance Lake.instComputeHashFilePathIO : Lake.ComputeHash System.FilePath IO

def Lake.computeTextFileHash (file : System.FilePath) : IO Lake.Hash

Compute the hash of a text file. Normalizes \r\n sequences to \n for cross-platform compatibility.

Equations

• Lake.computeTextFileHash file = do let text ← IO.FS.readFile file let text : String := text.crlfToLf pure (Lake.Hash.ofString text)

structure Lake.TextFilePath : Type

A wrapper around FilePath that adjusts its ComputeHash implementation to normalize \r\n sequences to \n for cross-platform compatibility.

• path : System.FilePath

instance Lake.instCoeTextFilePathFilePath : Coe Lake.TextFilePath System.FilePath

instance Lake.instComputeHashTextFilePathIO : Lake.ComputeHash Lake.TextFilePath IO

Equations

• Lake.instComputeHashTextFilePathIO = { computeHash := fun (x : Lake.TextFilePath) => Lake.computeTextFileHash x.path }

@[inline]

def Lake.computeFileHash (file : System.FilePath) (text : Bool := false) : IO Lake.Hash

Compute the hash of a file. If text := true, normalize line endings.

Equations

• Lake.computeFileHash file text = if text = true then Lake.computeTextFileHash file else Lake.computeBinFileHash file

@[inline]

def Lake.computeArrayHash {α : Type u_1} {m : Type → Type u_2} [Lake.ComputeHash α m] [Monad m] (as : Array α) : m Lake.Hash

Compute the hash of each element of an array and combine them (left-to-right).

instance Lake.instComputeHashArrayOfMonad {α : Type u_1} {m : Type → Type u_2} [Lake.ComputeHash α m] [Monad m] : Lake.ComputeHash (Array α) m

Equations

• Lake.instComputeHashArrayOfMonad = { computeHash := Lake.computeArrayHash }

Modification Time (MTime) Trace

def Lake.MTime : Type

A modification time (e.g., of a file).

Equations

• Lake.MTime = IO.FS.SystemTime

instance Lake.MTime.instOfNat : OfNat Lake.MTime 0

Equations

• Lake.MTime.instOfNat = { ofNat := { sec := 0, nsec := 0 } }

instance Lake.MTime.instBEq : BEq Lake.MTime

instance Lake.MTime.instRepr : Repr Lake.MTime

instance Lake.MTime.instOrd : Ord Lake.MTime

Equations

• Lake.MTime.instOrd = inferInstanceAs (Ord IO.FS.SystemTime)

instance Lake.MTime.instLT : LT Lake.MTime

Equations

• Lake.MTime.instLT = ltOfOrd

instance Lake.MTime.instLE : LE Lake.MTime

Equations

• Lake.MTime.instLE = leOfOrd

instance Lake.MTime.instMin : Min Lake.MTime

instance Lake.MTime.instMax : Max Lake.MTime

Equations

• Lake.MTime.instMax = maxOfLe

instance Lake.MTime.instNilTrace : Lake.NilTrace Lake.MTime

instance Lake.MTime.instMixTrace : Lake.MixTrace Lake.MTime

class Lake.GetMTime (α : Type u) : Type u

• getMTime : α → IO Lake.MTime

  Return the modification time of an object.

instance Lake.instComputeTraceIOMTimeOfGetMTime {α : Type u_1} [Lake.GetMTime α] : Lake.ComputeTrace α IO Lake.MTime

Equations

• Lake.instComputeTraceIOMTimeOfGetMTime = { computeTrace := Lake.getMTime }

@[inline]

def Lake.getFileMTime (file : System.FilePath) : IO Lake.MTime

Return the modification time of a file recorded by the OS.

Equations

• Lake.getFileMTime file = do let __do_lift ← file.metadata pure __do_lift.modified

instance Lake.instGetMTimeFilePath : Lake.GetMTime System.FilePath

instance Lake.instGetMTimeTextFilePath : Lake.GetMTime Lake.TextFilePath

Equations

• Lake.instGetMTimeTextFilePath = { getMTime := fun (x : Lake.TextFilePath) => Lake.getFileMTime x.path }

@[specialize #[]]

def Lake.MTime.checkUpToDate {i : Type u_1} [Lake.GetMTime i] (info : i) (self : Lake.MTime) : BaseIO Bool

Check if info is up-to-date using modification time. That is, check if the info is newer than self.

Equations

• One or more equations did not get rendered due to their size.

Lake Build Trace

structure Lake.BuildTrace : Type

Trace used for common Lake targets. Combines Hash and MTime.

• hash : Lake.Hash
• mtime : Lake.MTime

instance Lake.instReprBuildTrace : Repr Lake.BuildTrace

Equations

• Lake.instReprBuildTrace = { reprPrec := Lake.reprBuildTrace✝ }

@[inline]

def Lake.BuildTrace.ofHash (hash : Lake.Hash) : Lake.BuildTrace

instance Lake.BuildTrace.instCoeHash : Coe Lake.Hash Lake.BuildTrace

Equations

• Lake.BuildTrace.instCoeHash = { coe := Lake.BuildTrace.ofHash }

@[inline]

def Lake.BuildTrace.ofMTime (mtime : Lake.MTime) : Lake.BuildTrace

Equations

• Lake.BuildTrace.ofMTime mtime = { hash := Lake.Hash.nil, mtime := mtime }

instance Lake.BuildTrace.instCoeMTime : Coe Lake.MTime Lake.BuildTrace

def Lake.BuildTrace.nil : Lake.BuildTrace

instance Lake.BuildTrace.instNilTrace : Lake.NilTrace Lake.BuildTrace

@[specialize #[]]

def Lake.BuildTrace.compute {α : Type u_1} {m : Type → Type u_2} [Lake.ComputeHash α m] [MonadLiftT m IO] [Lake.GetMTime α] (info : α) : IO Lake.BuildTrace

Equations

• Lake.BuildTrace.compute info = do let __do_lift ← Lake.computeHash info let __do_lift_1 ← Lake.getMTime info pure { hash := __do_lift, mtime := __do_lift_1 }

instance Lake.BuildTrace.instComputeTraceIOOfComputeHashOfMonadLiftTOfGetMTime {α : Type u_1} {m : Type → Type u_2} [Lake.ComputeHash α m] [MonadLiftT m IO] [Lake.GetMTime α] : Lake.ComputeTrace α IO Lake.BuildTrace

def Lake.BuildTrace.mix (t1 t2 : Lake.BuildTrace) : Lake.BuildTrace

Equations

• t1.mix t2 = { hash := t1.hash.mix t2.hash, mtime := max t1.mtime t2.mtime }

instance Lake.BuildTrace.instMixTrace : Lake.MixTrace Lake.BuildTrace

Equations

• Lake.BuildTrace.instMixTrace = { mixTrace := Lake.BuildTrace.mix }

@[specialize #[]]

def Lake.BuildTrace.checkAgainstHash {i : Type u_1} [Lake.CheckExists i] (info : i) (hash : Lake.Hash) (self : Lake.BuildTrace) : BaseIO Bool

Check if the info is up-to-date using a hash. That is, check that info exists and its input hash matches this trace's hash.

@[inline]

def Lake.BuildTrace.checkAgainstTime {i : Type u_1} [Lake.GetMTime i] (info : i) (self : Lake.BuildTrace) : BaseIO Bool

Check if the info is up-to-date using modification time. That is, check if the info is newer than this input trace's modification time.

Equations

• Lake.BuildTrace.checkAgainstTime info self = Lake.MTime.checkUpToDate info self.mtime

@[specialize #[], deprecated]

def Lake.BuildTrace.checkAgainstFile {i : Type u_1} [Lake.CheckExists i] [Lake.GetMTime i] (info : i) (traceFile : System.FilePath) (self : Lake.BuildTrace) : BaseIO Bool

Check if the info is up-to-date using a trace file. If the file exists, match its hash to this trace's hash. If not, check if the info is newer than this trace's modification time.

Deprecated: Should not be done manually, but as part of buildUnlessUpToDate.

Equations

• One or more equations did not get rendered due to their size.

@[deprecated]

def Lake.BuildTrace.writeToFile (traceFile : System.FilePath) (self : Lake.BuildTrace) : IO PUnit

Write trace to a file.

Deprecated: Should not be done manually, but as part of buildUnlessUpToDate.