Import existing code

CHANGELOG.md

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+# Revision history for ExceptIOH
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.

ExceptIOH.cabal

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+cabal-version:       >=1.10
+-- Initial package description 'ExceptIOH.cabal' generated by 'cabal init'.
+--   For further documentation, see http://haskell.org/cabal/users-guide/
+
+name:                ExceptIOH
+version:             0.1.0.0
+synopsis:            Exception handling, cause apparently it's missing from the Except Monad ?
+-- description:
+homepage:            https://git.marvid.fr/Tissevert/ExceptIOH
+-- bug-reports:
+license:             BSD3
+license-file:        LICENSE
+author:              Tissevert
+maintainer:          tissevert+devel@marvid.fr
+-- copyright:
+category:            Control
+build-type:          Simple
+extra-source-files:  CHANGELOG.md
+
+library
+  exposed-modules:     Control.Monad.Except.IOH
+  -- other-modules:
+  -- other-extensions:
+  build-depends:       base >=4.12 && <4.13
+                     , mtl
+  hs-source-dirs:      src
+  default-language:    Haskell2010

LICENSE

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+Copyright (c) 2020, Tissevert
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Tissevert nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Setup.hs

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+import Distribution.Simple
+main = defaultMain

src/Control/Monad/Except/IOH.hs

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+module Control.Monad.Except.IOH (
+    handle
+  ) where
+
+import Control.Monad.Except (MonadError(..), ExceptT, runExceptT)
+
+handle :: Monad m => ExceptT a m b -> (a -> m b) -> m b
+handle m handler = (runExceptT m) >>= either handler return