handle

A version of catch with the arguments swapped around; useful in situations where the code for the handler is shorter. For example:

do handle (\NonTermination -> exitWith (ExitFailure 1)) $
...

The handle used by the action flagging this error.

Flipped catch. See Control.Exception's handle.

Flipped version of catch.

Flipped version of catch

Generalized version of handle. Note, when the given computation throws an exception any monadic side effects in m will be discarded.

Logs an event if it meets the requirements given by the most recent call to setLevel.

Flipped catch. See Control.Exception's handle.

When evaluating a stream if an exception occurs, stream evaluation aborts and the specified exception handler is run with the exception as argument. Inhibits stream fusion

Traditional exception construct. Typical usage in arrow notation:

proc p -> ...
body `handle` \ex -> handler

Flipped version of catch.

When evaluating a stream if an exception occurs, stream evaluation aborts and the specified exception handler is run with the exception as argument. The exception is caught and handled unless the handler decides to rethrow it. Note that exception handling is not applied to the stream returned by the exception handler. Observes exceptions only in the stream generation, and not in stream consumers. Inhibits stream fusion

Like Streamly.Data.Stream.handle but with one significant difference, this function observes exceptions from the consumer of the stream as well. You can also convert StreamK to Stream and use exception handling from Stream module:

>>> handle f s = StreamK.fromStream $ Stream.handle (\e -> StreamK.toStream (f e)) (StreamK.toStream s)

When unfolding Unfold m a b if an exception e occurs, unfold e using Unfold m e b. Inhibits stream fusion Pre-release

Generalized version of handle.

handle, but with the argument order swapped

>>> runPureEff $ handle (pure . show) $ \e -> do
throw e 42
pure "No exception thrown"
"42"

Like blob, but each Log is rendered as text in its own line. If the given Handle is associated to a TTY supporting ANSI colors, and the given LineRenderer supports rendering with colors, and you ask for it, then you will get colorful output.

Flipped version of catch