jc: add completions and README

[RGBCube]

Errors:

[weirdan]

Is there any chance to add magic command support too? You can run jc df instead of df | jc --df, but these completions won't suggest that.

[RGBCube]

Yup: ^jc --about | from json | get parsers | each { $in.magic_commands? } | flatten

Didn't know about magic_commands, cool!

[RGBCube]

Almost done, I now just want to make the magic commands appear fist

[RGBCube]

Seems like that's not a thing we can control. Oh well

[RGBCube]

Hmm, actually I can just filter based on the current input and not show the "-"

[RGBCube]

Works well now, but I removed the caching using $env as it wasn't working, and it's pretty slow to complete and recomplete. Any suggestions on caching it properly?

[RGBCube]

Managed to do it well using stor, neat!

[RGBCube]

Oops, there's a mistake where we memoize ones that don't contain "-"

[RGBCube]

Ready to merge now, would love to see if it works for you also @weirdan

[weirdan]

jc gi<tab> produces invalid completions (ought to include git ls-remote), but I can live with that.

[fdncred]

cool. thanks!

[RGBCube]

jc gi<tab> produces invalid completions (ought to include git ls-remote), but I can live with that.

The completions exist, but the thing I've noticed is that partial-completions don't really work great (which is what happens when you press gi<tab>, as it fills:

Screen.Recording.2025-07-19.at.01.15.22.mov

Not sure if this is the fault of the completer though, probably the shell as it isn't quoting for some reason