compleat

The "declarative" part doesn't really make sense IMO, but there are a bunch of links here about having a shell-agnostic system: https://github.com/oilshell/oil/wiki/Shell-Autocompletion https://github.com/oilshell/oil/wiki/Projects-Already-Doing-... https://github.com/mbrubeck/compleat (one of the only grammar-based ones, looks nice but doesn't appear to have been used very much) There are some discussions about cross-shell autocompletion on the #shell-autocompletion channel of https://oilshell.zulipchat.com/, but it didn't go that far. The Ion work described in the sibling blog post went the furthest in terms of implementation I think, but I haven't heard anything about it in awhile.

I'm working in this area right now if you want to help :) http://www.oilshell.org/ I took a survey of what people use here: https://lobste.rs/s/z96uyr/survey_what_shell_completion_scri... That produced a link to this old project which tried to do something like what you want: a completion system that works for multiple shells (in this case, by code generation from a DSL) https://github.com/mbrubeck/compleat It's easy for you to say "completion should be specified in the binary" without actually specifying HOW. That's not straightforward, although I agree it's a good goal. ----- Right now I'm implementing a bash-compatible completion API, and I'm actually getting pretty far without too much code. git-completion.bash is 3000 lines of code, so it's actually easier to emulate bash (with all its warts) than to write an entirely new completio

Great project! I've been looking for something like this for quite a while. There's compleat [1], but it doesn't seem to allow you to "compile" completions down to bash or zsh - you have to keep compleat (and therefore the whole Haskell stack) on your system. Of course, none of this would be a problem if there was a standard "--complete <shell>" flag. I ended up doing something a bit like that on a recent project [2] to avoid editing my completion scripts every time I added a new subcommand or flag to a utility. [1]: https://github.com/mbrubeck/compleat [2]: https://github.com/woodruffw/kbsecret/blob/master/completion...