feature: make completion with cmp-dap work for watch expressions

[mikehaertl]

Did you check the docs?

• I have read all the docs

Is your feature request related to a problem? Please describe.

Completion is very helpful when entering watch expressions.

Describe the solution you'd like

nvim-dap-ui lets you enter the expression directly in the watch window. This way https://github.com/rcarriga/cmp-dap also works there.

Could this be implemented in a similar way?

Describe alternatives you've considered

Additional context

No response

[igorlfs]

Hello,

Completion is very helpful when entering watch expressions.

Indeed!

Could this be implemented in a similar way?

This feature is in my "wishlist" as well. However, I wanna follow a different approach. Completions are also useful in some other contexts (e.g., conditional breakpoints, logpoints). These features also use input() (or vim.ui.input). My idea is to implement a custom input completion (see :h command-completion) for nvim-dap, and then use it here too.

If you wanna take a glimpse into this future, look no further than nvim-dap's omnifunc completion. I'm yet to study it more carefully, but it might not be too difficult to port it to the input's completion format.

[mikehaertl]

Sounds good. But I guess this will then not work with nvim-cmp. At least that's what I understand with my (limited) knowledge about how completions work in different contexts. I also found this:
hrsh7th/cmp-cmdline#16 (comment)

[igorlfs]

I also found this

This actually makes me optimistic. It looks like there's a clean way to update the sources for input(). The only downside would be writing a cmp source, I assume (which I wouldn't be interested in, since I'm no longer using nvim-cmp).