Add a `check` mode

[mmhat]

Is it possible to have a check mode, that tells you whether a given GHC version is in the get-tested stanza of a Cabal file or not?
What I mean is something like this:

$ get-tested get-tested.cabal
["9.10.1"]
$ get-tested check get-tested.cabal 9.10.1; echo $?
0
$ get-tested check get-tested.cabal 9.8.2; echo $?
1
$ get-tested check get-tested.cabal 9.8.2 9.10.1; echo $?
1

I know I can work around that (e.g. get-tested get-tested.cabal | jq --raw-output '.[]' | grep -q '9.10.1'), but that's rather hacky...

[Kleidukos]

Oh that's hacky indeed, jq provides a contains() filter for you already:

❯ get-tested *.cabal
["9.6.6","9.8.2","9.10.1"]

❯ get-tested *.cabal | jq 'contains(["9.10.1"])'
true

[webdevred]

Hi @Kleidukos @mmhat
Do you think we should close this issue?

In case there is still interest for this and if we are missing some particular thing in the current approach, I would be happy to continue the work and create a new PR based your on your work @mmhat

Best regards,
webdevred

[Kleidukos]

I'll let @mmhat tell us if it's still needed.