Modulepolysemy-1.9.2.0Haskell2010

Polysemy.Trace

Contents

Synopsis

Effect

datadata Trace (m :: k) a where

An effect for logging strings.

valuetrace :: Member Trace r => String -> Sem r ()

Log a message.

valuetraceToHandle

Run a Trace effect by printing the messages to the provided Handle.

valuetraceToStdout :: Member (Embed IO) r => Sem (Trace ': r) a -> Sem r a

Run a Trace effect by printing the messages to stdout.

valuetraceToStderr :: Member (Embed IO) r => Sem (Trace ': r) a -> Sem r a

Run a Trace effect by printing the messages to stderr.

valuetraceToIO :: Member (Embed IO) r => Sem (Trace ': r) a -> Sem r a

Deprecated. Use traceToStdout

Run a Trace effect by printing the messages to stdout.

valuerunTraceList :: Sem (Trace ': r) a -> Sem r ([String], a)

Get the result of a Trace effect as a list of Strings.

valueignoreTrace :: Sem (Trace ': r) a -> Sem r a

Run a Trace effect by ignoring all of its messages.

valuetraceToOutput :: Member (Output String) r => Sem (Trace ': r) a -> Sem r a

Transform a Trace effect into a Output String effect.

valueoutputToTrace

Transform an Output w effect into a Trace effect given a function to transform each w to a String.