This seems like a useful tool, but the naming might be confusing: "cabal-install" generally means "cabal install" but "cabal-clean" and "cabal clean" have similar goals but behave differently.

Tom

On Fri, Sep 24, 2021 at 07:09:49PM +0200, Andreas Abel wrote:

=== Wondering where your disk space goes with too many Haskell projects compiled with too many GHC versions? ===

https://hackage.haskell.org/package/cabal-clean
https://github.com/andreasabel/cabal-clean

`cabal-clean` is a small executable that removes outdated cabal build artifacts from `dist-newstyle`.

A build tree is considered outdated if there is one with either

- a newer version of the package you are building, or
- a newer minor version of the GHC compiler.

In contrast to `cabal clean`, the tool `cabal-clean` retains the latest build trees for each GHC major version. Thus, it is geared towards multi-GHC development.

Example: (self-applied to cabal-clean's build directory)

--- 3.7M ghc-8.8.4 /cabal-clean-0.1.20210815
--- 3.5M ghc-8.10.6/cabal-clean-0.1.20210815
--- 3.7M ghc-9.0.1 /cabal-clean-0.1.20210815
--- 3.5M ghc-8.10.6/cabal-clean-0.1.20210924
+++ 3.6M ghc-8.10.7/cabal-clean-0.1.20210924
+++ 3.7M ghc-9.0.1 /cabal-clean-0.1.20210924

The directories prefixed with --- will be deleted, the ones with +++ retained.

Disclaimers:

1. cabal-clean does not check whether deletion will cause dangling references like broken symlinks etc. (Could happen if you created a symlink to an executable that resides in one of the deleted build directories.)

2. cabal-clean does not read nor utilize information from the .cabal file.

3. Calls `du` ("disk usage"), so, might not work on Windows.

Enjoy,
Andreas
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