effectful-2.2.2.0: An easy to use, performant extensible effects library.
Safe HaskellSafe-Inferred
LanguageHaskell2010

Effectful.FileSystem.IO

Description

Lifted System.IO.

Synopsis

Effect

data FileSystem :: Effect Source #

An effect for interacting with the filesystem.

Instances

Instances details
type DispatchOf FileSystem Source # 
Instance details

Defined in Effectful.FileSystem.Effect

data StaticRep FileSystem Source # 
Instance details

Defined in Effectful.FileSystem.Effect

Handlers

runFileSystem :: IOE :> es => Eff (FileSystem ': es) a -> Eff es a Source #

Run the FileSystem effect.

IO

data IOMode #

Instances

Instances details
Enum IOMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.IOMode

Ix IOMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.IOMode

Read IOMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.IOMode

Show IOMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.IOMode

Eq IOMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.IOMode

Methods

(==) :: IOMode -> IOMode -> Bool #

(/=) :: IOMode -> IOMode -> Bool #

Ord IOMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.IOMode

data Handle #

Haskell defines operations to read and write characters from and to files, represented by values of type Handle. Each value of this type is a handle: a record used by the Haskell run-time system to manage I/O with file system objects. A handle has at least the following properties:

  • whether it manages input or output or both;
  • whether it is open, closed or semi-closed;
  • whether the object is seekable;
  • whether buffering is disabled, or enabled on a line or block basis;
  • a buffer (whose length may be zero).

Most handles will also have a current I/O position indicating where the next input or output operation will occur. A handle is readable if it manages only input or both input and output; likewise, it is writable if it manages only output or both input and output. A handle is open when first allocated. Once it is closed it can no longer be used for either input or output, though an implementation cannot re-use its storage while references remain to it. Handles are in the Show and Eq classes. The string produced by showing a handle is system dependent; it should include enough information to identify the handle for debugging. A handle is equal according to == only to itself; no attempt is made to compare the internal state of different handles for equality.

Instances

Instances details
Show Handle

Since: base-4.1.0.0

Instance details

Defined in GHC.IO.Handle.Types

Eq Handle

Since: base-4.1.0.0

Instance details

Defined in GHC.IO.Handle.Types

Methods

(==) :: Handle -> Handle -> Bool #

(/=) :: Handle -> Handle -> Bool #

withFile :: FileSystem :> es => FilePath -> IOMode -> (Handle -> Eff es a) -> Eff es a Source #

Lifted withFile.

withBinaryFile :: FileSystem :> es => FilePath -> IOMode -> (Handle -> Eff es a) -> Eff es a Source #

hClose :: FileSystem :> es => Handle -> Eff es () Source #

Lifted hClose

hFlush :: FileSystem :> es => Handle -> Eff es () Source #

Lifted hFlush

data BufferMode #

Three kinds of buffering are supported: line-buffering, block-buffering or no-buffering. These modes have the following effects. For output, items are written out, or flushed, from the internal buffer according to the buffer mode:

  • line-buffering: the entire output buffer is flushed whenever a newline is output, the buffer overflows, a hFlush is issued, or the handle is closed.
  • block-buffering: the entire buffer is written out whenever it overflows, a hFlush is issued, or the handle is closed.
  • no-buffering: output is written immediately, and never stored in the buffer.

An implementation is free to flush the buffer more frequently, but not less frequently, than specified above. The output buffer is emptied as soon as it has been written out.

Similarly, input occurs according to the buffer mode for the handle:

  • line-buffering: when the buffer for the handle is not empty, the next item is obtained from the buffer; otherwise, when the buffer is empty, characters up to and including the next newline character are read into the buffer. No characters are available until the newline character is available or the buffer is full.
  • block-buffering: when the buffer for the handle becomes empty, the next block of data is read into the buffer.
  • no-buffering: the next input item is read and returned. The hLookAhead operation implies that even a no-buffered handle may require a one-character buffer.

The default buffering mode when a handle is opened is implementation-dependent and may depend on the file system object which is attached to that handle. For most implementations, physical files will normally be block-buffered and terminals will normally be line-buffered.

Constructors

NoBuffering

buffering is disabled if possible.

LineBuffering

line-buffering should be enabled if possible.

BlockBuffering (Maybe Int)

block-buffering should be enabled if possible. The size of the buffer is n items if the argument is Just n and is otherwise implementation-dependent.

Instances

Instances details
Read BufferMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.Handle.Types

Show BufferMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.Handle.Types

Eq BufferMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.Handle.Types

Ord BufferMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.Handle.Types

hSeek :: FileSystem :> es => Handle -> SeekMode -> Integer -> Eff es () Source #

Lifted hSeek

data SeekMode #

A mode that determines the effect of hSeek hdl mode i.

Constructors

AbsoluteSeek

the position of hdl is set to i.

RelativeSeek

the position of hdl is set to offset i from the current position.

SeekFromEnd

the position of hdl is set to offset i from the end of the file.

Instances

Instances details
Enum SeekMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.Device

Ix SeekMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.Device

Read SeekMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.Device

Show SeekMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.Device

Eq SeekMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.Device

Ord SeekMode

Since: base-4.2.0.0

Instance details

Defined in GHC.IO.Device

hSetEcho :: FileSystem :> es => Handle -> Bool -> Eff es () Source #

Lifted hSetEcho