Can or how to trigger signature help?

[cr0wt]

Is your feature request related to a problem? Please describe.
I'm trying to set up signature help to be triggered just as it is possible with completion (ig by <Tab> or <c-space>).

Describe the solution you'd like
Documentation for signature has:

"signature.enable":~

	Enable signature help when trigger character typed, require restart
	service on change.,  default: `true`

And for completion:

"suggest.autoTrigger":~

	How should completion be triggered,  default: `"always"`

	Valid options: ["always","trigger","none"]

That "trigger" option and function/setting similiar to inoremap <silent><expr> <c-space> coc#refresh() for signature help is what I'm looking for.

Additional context
I'm aware of signature.triggerSignatureWait.

[chemzqm]

coc#refresh is for completion, there is an action for trigger signature help.

[yueyingjuesha]

@chemzqm, I tried to trigger the signature help using :call CocAction('showSignatureHelp'), or try to assign this command a map, no signature text display, however when I use autocmd User CocJumpPlaceholder call CocActionAsync('showSignatureHelp'), and in select mode when entering function parameter, it will trigger the signature help, quite don't understand here

[chemzqm]

Your language server could be slow to response.

[yueyingjuesha]

I think it isn't the timeout fault, when I use autocmd User CocJumpPlaceholder call CocActionAsync('showSignatureHelp') , the signature is returned instantly, I already bumped the signature.triggerSignatureWait to maximum 1000, but still not working when directly invoking command :call CocActionAsync('showSignatureHelp')

[yueyingjuesha]

Basically, I want a keymap that can trigger function signature help, not automatically triggered when entering function parameter(CocJumpPlaceholder)), do you know is there a workable solution to this? @chemzqm

[chemzqm]

CocActionAsync('showSignatureHelp') should work, make sure call it in insert mode instead of command line, your language server may return nothing, you can debug it https://github.com/neoclide/coc.nvim/wiki/Debug-coc.nvim

[yaegassy]

@yueyingjuesha Do you want to map "signature help" in insert mode?

e.g:

inoremap <silent> ,s <C-r>=CocActionAsync('showSignatureHelp')<CR>

[yueyingjuesha]

That's pretty nice, it works!

[jzes]

Awesome