feat: register: Implement --drop flag mirroring functionality

[alerque]

This implements the same --drop functionality as balance command for register subcommand, allowing users to trim leading account name components from register output.

[simonmichael]

Nice! Would you mind mentioning it briefly in the body of Register.md also. (The flags list at the top will be regenerated before release, so updating that is optional.)

[alerque]

Something like that?

[simonmichael]

Great. There's still a build warning; hopefully just functest reproduces it on your machine. (If not, try a stack clean --full first.)

[alerque]

Unfortunately none of the just tasks or default invocations of stack work for me at all (due to old ghc, lack of ghcid, etc.) so part of the reason to get the PR open was to get CI results.

[simonmichael]

Unfortunately none of the just tasks or default invocations of stack work for me at all (due to old ghc

Could you help me understand this kind of situation better ? What ghc version(s), installed by what method, do you have ?

[simonmichael]

PR looks good - thank you!

[alerque]

Could you help me understand this kind of situation better ? What ghc version(s), installed by what method, do you have ?

GHC 9.6.6 installed by system packages on Arch. Yes it is ancient, yes there is work being done to update it, but our whole Haskell stack being dynamically linked is a huge pain point. GHCID is just not packaged at all, probably because it wasn't compatible with whatever ghc we had a while back and had to get dropped to unblock a ghc update. I see it does actually build at the moment. I'll check on it again when the GHC stack gets fully up to date and see if it can get added.

[simonmichael]

Ah Arch. (It's always Arch. :) But, GHC 9.6 is still supported by hledger, so it shouldn't be a big deal to use it. It might be enough to change this line in Justfile (make it use stack96.yaml):

#STACK := 'stack --stack-yaml=stack912.yaml'

ghcid is not something you need, probably. I use it only when HLS in VS Code isn't working.

We do want it to be easy for everyone to be able to run just test or just functest though.

[simonmichael]

Related: recent discussion of Justfile/test portability and dev docs at #2528.