Popularity
8.0
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0.0
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16
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Monthly Downloads: 14
Programming language: Haskell
License: MIT License
Tags:
Control
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README
Hoist Error
A typeclass and some combinators to aid in the lifting of errors into your preferred context.
As an example, assuming we have the following error type:
data MyError
= WrongInt Int
| WrapLibError LibError
This package provides a combinator for straight forward translation of a general error case into a more specific type:
-- Given a function:
fn :: MonadIO m => Int -> m (Maybe b)
-- Working in some MonadError context..
... :: MonadError MyError m => m b
-- Handle the `Nothing` case by using an explicit constructor, with no intermediate boilerplate.
g :: (MonadIO m, MonadError MyError m) => Int -> m b
g n = fn n <!?> WrongInt n
You're able to run a function on the error as well:
-- Given...
fn :: MonadIO m => Int -> Either LibError b
-- Provide an `(e -> e')` function as required. In this case, wrapping a general
-- library error with our more relevant constructor.
g :: (MonadIO m, MonadError MyError m) => Int -> m b
g n = fn n <%!?> WrapLibError