feature request: command to remove old versions

[peterbecich]

Old versions of GHC, HLS, Cabal and Stack are kept by ghcup, a good idea to allow the user to revert to an older version.

I.m.o. a command to remove tool versions lower than what is currently set by the user would be useful.

This would save the effort of manually rming each old version.

Perhaps ghcup clean

Thanks

[hasufell]

There's already ghcup gc --old-ghc. But that relies on what is marked Old in the ghcup metadata, so might not remove everything.

[hasufell]

See #1020

This removes all "non-set versions" (of all tools). Anything more specific seems overkill to me.

[peterbecich]

Fantastic, looks good to me, thank you