cabal-env

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Tool for managing GHC package environments

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# cabal-env

`cabal-env` is a prototype UI for managing the new [package environments](https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/packages.html#package-environments) facility implement in GHC for use by cabal's [nix-style local builds](https://cabal.readthedocs.io/en/latest/nix-local-build-overview.html) which allows to provide seamless access to the nix-style package store for direct invocations GHC and GHCi.

__NOTE__: A newer different prototype (different implementation, but same name `cabal-env`) can be found at https://github.com/phadej/cabal-env

## Usage

```
Usage: ./cabal-env.sh [-n <env-name>] (-r | -l | [DEP]+)"

Creates GHC package environment named '<env-name>' (default = 'default')
containing the specified deps.

Flags:

-n <env-name>   set environment name to operate on;
                  use the special env-name '.' to create a
                  local '.ghc.environment' file in the current folder.
                  (default: 'default')

-r              deletes the specified environment (via -n)

-l              lists available environments for current 'ghc'
                  (cannot be combined with other flags)

-i              create temporary environment and invoke GHCi with it
                  (cannot be combined with other flags)

-s <script>     run script (via 'runghc') in temporary environment

GHC Package environments are supported since GHC 8.0.2 and Cabal 2.2;
By default, the environment named 'default' is loaded by GHC and GHCi
if it exists.

You can select a specific package environment for GHC(i) via e.g.
'ghci -package-env myenv' or by setting an environment variable
'GHC_ENVIRONMENT=myenv ghci'

Examples:

./cabal-env.sh -n lens 'lens == 4.15.*' 'lens-aeson == 1.0.*' http-streams

./cabal-env.sh unordered-containers QuickCheck quickcheck-instances

./cabal-env.sh -s webcrawler.hs wreq

./cabal-env.sh -i lens-aeson
```

cabal-env

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