Fix treesitter function color and add nvim-cmp highlights

[David-Else]

Please see https://github.com/hrsh7th/nvim-cmp/wiki/Menu-Appearance#how-to-add-visual-studio-code-dark-theme-colors-to-the-menu. This PR adds those highlights directly.

(and also this PR makes the function keyword blue in treesitter, as it should be)

[tomasiser]

Thank you for this PR! Merged! :)

[immjolnir]

Hi @David-Else @tomasiser

First of all, thanks for your awesome contribution. But I thought, it would be better let you know my case:

I got an error when entering the vim:

Error detected while processing function <SNR>15_hi:
line    8:
E418: Illegal value: strikethrough
Press ENTER or type command to continue

After I removed the line:

call <sid>hi('CmpItemAbbrDeprecated', s:cdGray, {}, 'strikethrough', {})

It worked as intended. Does it depend on other plugins?

FYI, its latest commit in my host is

$ git log
commit 7fe0dc672b20ef62962494560a0bc656fb237346 (HEAD -> master, origin/master, origin/HEAD)
Merge: b75d76f 0edd11c
Author: Tomáš Iser <[email protected]>
Date:   Fri Dec 17 14:58:50 2021 +0100

    Merge pull request #63 from zdzislaw-s/zdzislaw-c++-vscode-vs-vim
    
    Changes for better colorization of C++ code

Would you please take a look?

[David-Else]

I think it is very rare that a terminal does not support strikethrough. It does not depend on anything apart from your terminal.

If some kind of check can be done (Afraid I don't know vimscript :( ):

IF terminal supports: call <sid>hi('CmpItemAbbrDeprecated', s:cdGray, {}, 'strikethrough', {})
ELSE it doesn't: call <sid>hi('CmpItemAbbrDeprecated', s:cdGray, {}, 'none', {})

Then it would fix it. Do you have another terminal on your machine? I found this comment that might help with this issue: tmux/tmux#612 (comment)

[immjolnir]

Thanks for replying. I dig it deeper today and found that it is caused by the statement in ~/.vimrc:

colorscheme codedark

It will disappear when using the below:

let g:airline_theme = 'codedark'

After reading the code, I found that call <sid>hi function looks like working as below:

:hi comment guifg=Blue ctermfg=Red cterm=underline

But when I set cterm=strikethrough, the error: E418: Illegal value: strikethrough will be displayed.

So, it seems that cterm should have some predefined options, but strikethrough is not included, right?

FYI, my terminal is terminator and echo -e "\e[9mstrikethrough\e[0m" works as intended.

[tomasiser]

Hmm, this looks like a serious problem. Interesting that no one has complained about it so far. Could you try it in a different terminal just to make sure it is really a problem of the terminal and not something deeper in your vim / system?