Init.System.IO

Programs can execute IO actions during initialization that occurs before the main function is executed. The attribute [init ] specifies which IO action is executed to set the value of an opaque constant.

The action initializing returns true iff it is invoked during initialization.

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@[extern lean_io_as_task]

opaque BaseIO.asTask {α : Type} (act : BaseIO α) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task α)

Run act in a separate Task. This is similar to Haskell's unsafeInterleaveIO, except that the Task is started eagerly as usual. Thus pure accesses to the Task do not influence the impure act computation. Unlike with pure tasks created by Task.spawn, tasks created by this function will be run even if the last reference to the task is dropped. The act should manually check for cancellation via IO.checkCanceled if it wants to react to that.

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@[extern lean_io_map_task]

opaque BaseIO.mapTask {α : Type u_1} {β : Type} (f : α → BaseIO β) (t : Task α) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task β)

See BaseIO.asTask.

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@[extern lean_io_bind_task]

opaque BaseIO.bindTask {α : Type u_1} {β : Type} (t : Task α) (f : α → BaseIO (Task β)) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task β)

See BaseIO.asTask.

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def BaseIO.mapTasks {α : Type u_1} {β : Type} (f : List α → BaseIO β) (tasks : List (Task α)) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task β)

Equations

BaseIO.mapTasks f tasks prio = BaseIO.mapTasks.go f prio tasks []

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def BaseIO.mapTasks.go {α : Type u_1} {β : Type} (f : List α → BaseIO β) (prio : optParam Task.Priority Task.Priority.default) :

List (Task α) → List α → BaseIO (Task β)

Equations

BaseIO.mapTasks.go f prio (t :: ts) x = BaseIO.bindTask t (fun a => BaseIO.mapTasks.go f prio ts (a :: x)) prio
BaseIO.mapTasks.go f prio [] x = BaseIO.asTask (f (List.reverse x)) prio

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@[inline]

def EIO.asTask {ε : Type} {α : Type} (act : EIO ε α) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task (Except ε α))

EIO specialization of BaseIO.asTask.

Equations

EIO.asTask act prio = BaseIO.asTask (EIO.toBaseIO act) prio

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@[inline]

def EIO.mapTask {α : Type u_1} {ε : Type} {β : Type} (f : α → EIO ε β) (t : Task α) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task (Except ε β))

EIO specialization of BaseIO.mapTask.

Equations

EIO.mapTask f t prio = BaseIO.mapTask (fun a => EIO.toBaseIO (f a)) t prio

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@[inline]

def EIO.bindTask {α : Type u_1} {ε : Type} {β : Type} (t : Task α) (f : α → EIO ε (Task (Except ε β))) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task (Except ε β))

EIO specialization of BaseIO.bindTask.

Equations

EIO.bindTask t f prio = BaseIO.bindTask t (fun a => EIO.catchExceptions (f a) fun e => pure { get := Except.error e }) prio

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@[inline]

def EIO.mapTasks {α : Type u_1} {ε : Type} {β : Type} (f : List α → EIO ε β) (tasks : List (Task α)) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task (Except ε β))

EIO specialization of BaseIO.mapTasks.

Equations

EIO.mapTasks f tasks prio = BaseIO.mapTasks (fun as => EIO.toBaseIO (f as)) tasks prio

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def IO.ofExcept {ε : Type u_1} {α : Type} [inst : ToString ε] (e : Except ε α) :

IO α

Equations

IO.ofExcept e = match e with | Except.ok a => pure a | Except.error e => throw (IO.userError (toString e))

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def IO.lazyPure {α : Type} (fn : Unit → α) :

IO α

Equations

IO.lazyPure fn = pure (fn ())

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@[extern lean_io_mono_ms_now]

opaque IO.monoMsNow :

BaseIO Nat

Monotonically increasing time since an unspecified past point in milliseconds. No relation to wall clock time.

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@[extern lean_io_mono_nanos_now]

opaque IO.monoNanosNow :

BaseIO Nat

Monotonically increasing time since an unspecified past point in nanoseconds. No relation to wall clock time.

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@[extern lean_io_get_random_bytes]

opaque IO.getRandomBytes (nBytes : USize) :

IO ByteArray

Read bytes from a system entropy source. Not guaranteed to be cryptographically secure. If nBytes = 0, return immediately with an empty buffer.

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def IO.sleep (ms : UInt32) :

BaseIO Unit

Equations

IO.sleep ms s = dbgSleep ms fun x => EStateM.Result.ok () s

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@[inline]

def IO.asTask {α : Type} (act : IO α) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task (Except IO.Error α))

IO specialization of EIO.asTask.

Equations

IO.asTask act prio = EIO.asTask act prio

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@[inline]

def IO.mapTask {α : Type u_1} {β : Type} (f : α → IO β) (t : Task α) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task (Except IO.Error β))

IO specialization of EIO.mapTask.

Equations

IO.mapTask f t prio = EIO.mapTask f t prio

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@[inline]

def IO.bindTask {α : Type u_1} {β : Type} (t : Task α) (f : α → IO (Task (Except IO.Error β))) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task (Except IO.Error β))

IO specialization of EIO.bindTask.

Equations

IO.bindTask t f prio = EIO.bindTask t f prio

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@[inline]

def IO.mapTasks {α : Type u_1} {β : Type} (f : List α → IO β) (tasks : List (Task α)) (prio : optParam Task.Priority Task.Priority.default) :

BaseIO (Task (Except IO.Error β))

IO specialization of EIO.mapTasks.

Equations

IO.mapTasks f tasks prio = EIO.mapTasks f tasks prio

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@[extern lean_io_check_canceled]

opaque IO.checkCanceled :

BaseIO Bool

Check if the task's cancellation flag has been set by calling IO.cancel or dropping the last reference to the task.

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@[extern lean_io_cancel]

opaque IO.cancel {α : Type u_1} :

Task α → BaseIO Unit

Request cooperative cancellation of the task. The task must explicitly call IO.checkCanceled to react to the cancellation.

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@[extern lean_io_has_finished]

opaque IO.hasFinished {α : Type u_1} :

Task α → BaseIO Bool

Check if the task has finished execution, at which point calling Task.get will return immediately.

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@[extern lean_io_wait]

opaque IO.wait {α : Type} (t : Task α) :

BaseIO α

Wait for the task to finish, then return its result.

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@[extern lean_io_wait_any]

opaque IO.waitAny {α : Type} (tasks : List (Task α)) (h : autoParam (List.length tasks > 0) _auto✝) :

BaseIO α

Wait until any of the tasks in the given list has finished, then return its result.

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@[extern lean_io_get_num_heartbeats]

opaque IO.getNumHeartbeats :

BaseIO Nat

Helper method for implementing "deterministic" timeouts. It is the number of "small" memory allocations performed by the current execution thread.

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inductive IO.FS.Mode :

Type

read: IO.FS.Mode
write: IO.FS.Mode
readWrite: IO.FS.Mode
append: IO.FS.Mode

Instances For

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opaque IO.FS.Handle :

Type

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structure IO.FS.Stream :

Type

flush : IO Unit
Read up to the given number of bytes from the stream. If the returned array is empty, an end-of-file marker has been reached. Note that EOF does not actually close a stream, so further reads may block and return more data.
read : USize → IO ByteArray
write : ByteArray → IO Unit
Read text up to (including) the next line break from the stream. If the returned string is empty, an end-of-file marker has been reached. Note that EOF does not actually close a stream, so further reads may block and return more data.
getLine : IO String
putStr : String → IO Unit

A pure-Lean abstraction of POSIX streams. We use Streams for the standard streams stdin/stdout/stderr so we can capture output of #eval commands into memory.

Instances For

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instance IO.FS.instInhabitedStream :

Inhabited IO.FS.Stream

Equations

IO.FS.instInhabitedStream = { default := { flush := default, read := default, write := default, getLine := default, putStr := default } }

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@[extern lean_get_stdin]

opaque IO.getStdin :

BaseIO IO.FS.Stream

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@[extern lean_get_stdout]

opaque IO.getStdout :

BaseIO IO.FS.Stream

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@[extern lean_get_stderr]

opaque IO.getStderr :

BaseIO IO.FS.Stream

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@[extern lean_get_set_stdin]

opaque IO.setStdin :

IO.FS.Stream → BaseIO IO.FS.Stream

Replaces the stdin stream of the current thread and returns its previous value.

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@[extern lean_get_set_stdout]

opaque IO.setStdout :

IO.FS.Stream → BaseIO IO.FS.Stream

Replaces the stdout stream of the current thread and returns its previous value.

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@[extern lean_get_set_stderr]

opaque IO.setStderr :

IO.FS.Stream → BaseIO IO.FS.Stream

Replaces the stderr stream of the current thread and returns its previous value.

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@[specialize #[]]

partial def IO.iterate {α : Type} {β : Type} (a : α) (f : α → IO (α ⊕ β)) :

IO β

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@[extern lean_io_prim_handle_mk]

opaque IO.FS.Handle.mkPrim (fn : System.FilePath) (mode : String) :

IO IO.FS.Handle

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def IO.FS.Handle.mk (fn : System.FilePath) (Mode : IO.FS.Mode) (bin : optParam Bool true) :

IO IO.FS.Handle

Equations

IO.FS.Handle.mk fn Mode bin = IO.FS.Handle.mkPrim fn (IO.FS.Handle.fopenFlags Mode bin)

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@[extern lean_io_prim_handle_flush]

opaque IO.FS.Handle.flush (h : IO.FS.Handle) :

IO Unit

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@[extern lean_io_prim_handle_read]

opaque IO.FS.Handle.read (h : IO.FS.Handle) (bytes : USize) :

IO ByteArray

Read up to the given number of bytes from the handle. If the returned array is empty, an end-of-file marker has been reached. Note that EOF does not actually close a handle, so further reads may block and return more data.

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@[extern lean_io_prim_handle_write]

opaque IO.FS.Handle.write (h : IO.FS.Handle) (buffer : ByteArray) :

IO Unit

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@[extern lean_io_prim_handle_get_line]

opaque IO.FS.Handle.getLine (h : IO.FS.Handle) :

IO String

Read text up to (including) the next line break from the handle. If the returned string is empty, an end-of-file marker has been reached. Note that EOF does not actually close a handle, so further reads may block and return more data.

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@[extern lean_io_prim_handle_put_str]

opaque IO.FS.Handle.putStr (h : IO.FS.Handle) (s : String) :

IO Unit

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@[extern lean_io_realpath]

opaque IO.FS.realPath (fname : System.FilePath) :

IO System.FilePath

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@[extern lean_io_remove_file]

opaque IO.FS.removeFile (fname : System.FilePath) :

IO Unit

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@[extern lean_io_remove_dir]

opaque IO.FS.removeDir :

System.FilePath → IO Unit

Remove given directory. Fails if not empty; see also IO.FS.removeDirAll.

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@[extern lean_io_create_dir]

opaque IO.FS.createDir :

System.FilePath → IO Unit

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@[extern lean_io_getenv]

opaque IO.getEnv (var : String) :

BaseIO (Option String)

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@[extern lean_io_app_path]

opaque IO.appPath :

IO System.FilePath

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@[extern lean_io_current_dir]

opaque IO.currentDir :

IO System.FilePath

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@[inline]

def IO.FS.withFile {α : Type} (fn : System.FilePath) (mode : IO.FS.Mode) (f : IO.FS.Handle → IO α) :

IO α

Equations

IO.FS.withFile fn mode f = IO.FS.Handle.mk fn mode true >>= f

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def IO.FS.Handle.putStrLn (h : IO.FS.Handle) (s : String) :

IO Unit

Equations

IO.FS.Handle.putStrLn h s = IO.FS.Handle.putStr h (String.push s (Char.ofNat 10))

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def IO.FS.Handle.readBinToEnd (h : IO.FS.Handle) :

IO ByteArray

Equations

IO.FS.Handle.readBinToEnd h = IO.FS.Handle.readBinToEnd.loop h ByteArray.empty

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partial def IO.FS.Handle.readBinToEnd.loop (h : IO.FS.Handle) (acc : ByteArray) :

IO ByteArray

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def IO.FS.Handle.readToEnd (h : IO.FS.Handle) :

IO String

Equations

IO.FS.Handle.readToEnd h = IO.FS.Handle.readToEnd.loop h ""

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partial def IO.FS.Handle.readToEnd.loop (h : IO.FS.Handle) (s : String) :

IO String

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def IO.FS.readBinFile (fname : System.FilePath) :

IO ByteArray

Equations

IO.FS.readBinFile fname = do let h ← IO.FS.Handle.mk fname IO.FS.Mode.read true IO.FS.Handle.readBinToEnd h

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def IO.FS.readFile (fname : System.FilePath) :

IO String

Equations

IO.FS.readFile fname = do let h ← IO.FS.Handle.mk fname IO.FS.Mode.read false IO.FS.Handle.readToEnd h

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def IO.FS.lines (fname : System.FilePath) :

IO (Array String)

Equations

IO.FS.lines fname = do let h ← IO.FS.Handle.mk fname IO.FS.Mode.read false IO.FS.lines.read h #[]

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partial def IO.FS.lines.read (h : IO.FS.Handle) (lines : Array String) :

IO (Array String)

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def IO.FS.writeBinFile (fname : System.FilePath) (content : ByteArray) :

IO Unit

Equations

IO.FS.writeBinFile fname content = do let h ← IO.FS.Handle.mk fname IO.FS.Mode.write true IO.FS.Handle.write h content

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def IO.FS.writeFile (fname : System.FilePath) (content : String) :

IO Unit

Equations

IO.FS.writeFile fname content = do let h ← IO.FS.Handle.mk fname IO.FS.Mode.write false IO.FS.Handle.putStr h content

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def IO.FS.Stream.putStrLn (strm : IO.FS.Stream) (s : String) :

IO Unit

Equations

IO.FS.Stream.putStrLn strm s = IO.FS.Stream.putStr strm (String.push s (Char.ofNat 10))

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structure IO.FS.DirEntry :

Type

root : System.FilePath
fileName : String

Instances For

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instance IO.FS.instReprDirEntry :

Repr IO.FS.DirEntry

Equations

IO.FS.instReprDirEntry = { reprPrec := IO.FS.reprDirEntry✝ }

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def IO.FS.DirEntry.path (entry : IO.FS.DirEntry) :

System.FilePath

Equations

IO.FS.DirEntry.path entry = entry.root / { toString := entry.fileName }

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inductive IO.FS.FileType :

Type

Instances For

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instance IO.FS.instReprFileType :

Repr IO.FS.FileType

Equations

IO.FS.instReprFileType = { reprPrec := IO.FS.reprFileType✝ }

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instance IO.FS.instBEqFileType :

BEq IO.FS.FileType

Equations

IO.FS.instBEqFileType = { beq := IO.FS.beqFileType✝ }

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structure IO.FS.SystemTime :

Type

sec : Int
nsec : UInt32

Instances For

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instance IO.FS.instReprSystemTime :

Repr IO.FS.SystemTime

Equations

IO.FS.instReprSystemTime = { reprPrec := IO.FS.reprSystemTime✝ }

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instance IO.FS.instBEqSystemTime :

BEq IO.FS.SystemTime

Equations

IO.FS.instBEqSystemTime = { beq := IO.FS.beqSystemTime✝ }

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instance IO.FS.instOrdSystemTime :

Ord IO.FS.SystemTime

Equations

IO.FS.instOrdSystemTime = { compare := IO.FS.ordSystemTime✝ }

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instance IO.FS.instInhabitedSystemTime :

Inhabited IO.FS.SystemTime

Equations

IO.FS.instInhabitedSystemTime = { default := { sec := default, nsec := default } }

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instance IO.FS.instLTSystemTime :

LT IO.FS.SystemTime

Equations

IO.FS.instLTSystemTime = ltOfOrd

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instance IO.FS.instLESystemTime :

LE IO.FS.SystemTime

Equations

IO.FS.instLESystemTime = leOfOrd

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structure IO.FS.Metadata :

Type

accessed : IO.FS.SystemTime
modified : IO.FS.SystemTime
byteSize : UInt64
type : IO.FS.FileType

Instances For

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instance IO.FS.instReprMetadata :

Repr IO.FS.Metadata

Equations

IO.FS.instReprMetadata = { reprPrec := IO.FS.reprMetadata✝ }

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@[extern lean_io_read_dir]

opaque System.FilePath.readDir :

System.FilePath → IO (Array IO.FS.DirEntry)

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@[extern lean_io_metadata]

opaque System.FilePath.metadata :

System.FilePath → IO IO.FS.Metadata

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def System.FilePath.isDir (p : System.FilePath) :

BaseIO Bool

Equations

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

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def System.FilePath.pathExists (p : System.FilePath) :

BaseIO Bool

Equations

System.FilePath.pathExists p = do let __do_lift ← EIO.toBaseIO (System.FilePath.metadata p) pure (Except.toBool __do_lift)

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def System.FilePath.walkDir (p : System.FilePath) (enter : optParam (System.FilePath → IO Bool) fun x => pure true) :

IO (Array System.FilePath)

Return all filesystem entries of a preorder traversal of all directories satisfying enter, starting at p. Symbolic links are visited as well by default.

Equations

System.FilePath.walkDir p enter = Prod.snd <$> StateT.run (System.FilePath.walkDir.go enter p) #[]

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partial def System.FilePath.walkDir.go (enter : optParam (System.FilePath → IO Bool) fun x => pure true) (p : System.FilePath) :

StateT (Array System.FilePath) IO Unit

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def IO.withStdin {m : Type → Type u_1} {α : Type} [inst : Monad m] [inst : MonadFinally m] [inst : MonadLiftT BaseIO m] (h : IO.FS.Stream) (x : m α) :

m α

Equations

IO.withStdin h x = do let prev ← liftM (IO.setStdin h) tryFinally x (discard (liftM (IO.setStdin prev)))

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def IO.withStdout {m : Type → Type u_1} {α : Type} [inst : Monad m] [inst : MonadFinally m] [inst : MonadLiftT BaseIO m] (h : IO.FS.Stream) (x : m α) :

m α

Equations

IO.withStdout h x = do let prev ← liftM (IO.setStdout h) tryFinally x (discard (liftM (IO.setStdout prev)))

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def IO.withStderr {m : Type → Type u_1} {α : Type} [inst : Monad m] [inst : MonadFinally m] [inst : MonadLiftT BaseIO m] (h : IO.FS.Stream) (x : m α) :

m α

Equations

IO.withStderr h x = do let prev ← liftM (IO.setStderr h) tryFinally x (discard (liftM (IO.setStderr prev)))

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def IO.print {α : Type u_1} [inst : ToString α] (s : α) :

IO Unit

Equations

IO.print s = do let out ← liftM IO.getStdout IO.FS.Stream.putStr out (toString s)

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def IO.println {α : Type u_1} [inst : ToString α] (s : α) :

IO Unit

Equations

IO.println s = IO.print (String.push (toString s) (Char.ofNat 10))

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def IO.eprint {α : Type u_1} [inst : ToString α] (s : α) :

IO Unit

Equations

IO.eprint s = do let out ← liftM IO.getStderr IO.FS.Stream.putStr out (toString s)

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def IO.eprintln {α : Type u_1} [inst : ToString α] (s : α) :

IO Unit

Equations

IO.eprintln s = IO.eprint (String.push (toString s) (Char.ofNat 10))

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def IO.appDir :

IO System.FilePath

Equations

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

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partial def IO.FS.createDirAll (p : System.FilePath) :

IO Unit

Create given path and all missing parents as directories.

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partial def IO.FS.removeDirAll (p : System.FilePath) :

IO Unit

Fully remove given directory by deleting all contained files and directories in an unspecified order. Fails if any contained entry cannot be deleted or was newly created during execution.

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inductive IO.Process.Stdio :

Type

Instances For

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def IO.Process.Stdio.toHandleType :

IO.Process.Stdio → Type

Equations

IO.Process.Stdio.toHandleType x = match x with | IO.Process.Stdio.piped => IO.FS.Handle | IO.Process.Stdio.inherit => Unit | IO.Process.Stdio.null => Unit

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structure IO.Process.StdioConfig :

Type

Configuration for the process' stdin handle.
stdin : IO.Process.Stdio
Configuration for the process' stdout handle.
stdout : IO.Process.Stdio
Configuration for the process' stderr handle.
stderr : IO.Process.Stdio

Instances For

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structure IO.Process.SpawnArgsextends IO.Process.StdioConfig :

Type

Command name.
cmd : String
Arguments for the process
args : Array String
Working directory for the process. Inherit from current process if none.
cwd : Option System.FilePath
Add or remove environment variables for the process.
env : Array (String × Option String)

Instances For

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structure IO.Process.Child (cfg : IO.Process.StdioConfig) :

Type

stdin : IO.Process.Stdio.toHandleType cfg.stdin
stdout : IO.Process.Stdio.toHandleType cfg.stdout
stderr : IO.Process.Stdio.toHandleType cfg.stderr

Instances For

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@[extern lean_io_process_spawn]

opaque IO.Process.spawn (args : IO.Process.SpawnArgs) :

IO (IO.Process.Child args.toStdioConfig)

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@[extern lean_io_process_child_wait]

opaque IO.Process.Child.wait {cfg : IO.Process.StdioConfig} :

IO.Process.Child cfg → IO UInt32

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@[extern lean_io_process_child_take_stdin]

opaque IO.Process.Child.takeStdin {cfg : IO.Process.StdioConfig} :

IO.Process.Child cfg → IO (IO.Process.Stdio.toHandleType cfg.stdin × IO.Process.Child { stdin := IO.Process.Stdio.null, stdout := cfg.stdout, stderr := cfg.stderr })

Extract the stdin field from a Child object, allowing them to be freed independently. This operation is necessary for closing the child process' stdin while still holding on to a process handle, e.g. for Child.wait. A file handle is closed when all references to it are dropped, which without this operation includes the Child object.

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structure IO.Process.Output :

Type

exitCode : UInt32
stdout : String
stderr : String

Instances For

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def IO.Process.output (args : IO.Process.SpawnArgs) :

IO IO.Process.Output

Run process to completion and capture output.

Equations

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

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def IO.Process.run (args : IO.Process.SpawnArgs) :

IO String

Run process to completion and return stdout on success.

Equations

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

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@[extern lean_io_exit]

opaque IO.Process.exit {α : Type} :

UInt8 → IO α

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structure IO.AccessRight :

Type

read : Bool
write : Bool
execution : Bool

Instances For

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def IO.AccessRight.flags (acc : IO.AccessRight) :

UInt32

Equations

IO.AccessRight.flags acc = let r := if acc.read = true then 4 else 0; let w := if acc.write = true then 2 else 0; let x := if acc.execution = true then 1 else 0; UInt32.lor r (UInt32.lor w x)