System.Process.ListLike.Classes

Documentation

class ListLikeIO a c => ListLikeLazyIO a c where

Class of types which can be used as the input and outputs of these process functions.

Methods

readChunks :: Handle -> IO [a]

Read the list of chunks from this handle. For lazy types this is just a call to hGetContents followed by toChunks. For strict types it might return a singleton list. Strings are trickier.

Instances

ListLikeLazyIO String Char

This String instance is implemented using the Lazy Text instance. Otherwise (without some serious coding) String would be a strict instance . Note that the readProcess in the process library is strict, while our equivalent is not - see test4 in Tests/Dots.hs.

ListLikeLazyIO String Char

ListLikeLazyIO ByteString Word8

ListLikeLazyIO ByteString Word8

ListLikeLazyIO Text Char

ListLikeLazyIO Text Char

class Monoid b => ProcessOutput a b | b -> a where

Methods for turning the output of a process into a monoid.

Methods

pidf :: ProcessHandle -> b

outf :: a -> b

errf :: a -> b

intf :: SomeException -> b

codef :: ExitCode -> b

Instances

(ListLikeLazyIO a c, Monoid a) => ProcessOutput a (StdoutWrapper a)

ListLikeLazyIO a c => ProcessOutput a [Chunk a]

ListLikeLazyIO a c => ProcessOutput a (ExitCode, [Chunk a])

ListLikeLazyIO a c => ProcessOutput a (ExitCode, a, a)