Add comment toggling

[habamax]

Refers to #14626

[chrisbra]

Thanks. Can you add this:

	vim9script
	import autoload 'dist/comment.vim'
	nnoremap <silent> <expr> gc comment.Toggle()
	xnoremap <silent> <expr> gc comment.Toggle()
	nnoremap <silent> <expr> gcc comment.Toggle() .. '_'

into a new file pack/dist/opt/comment/plugin/comment.vim?

Then we can add the following to the documentation:

 Load the plugin with this command: >
    packadd comment
<
This way you can use the plugin with the default key bindings `gc` and similar for commenting (which is a well-established mapping established in the Vim community). 

To have more control over the mappings used, add the following snippet to your .vimrc (assuming vim9 script): >
	vim9script
	import autoload 'dist/comment.vim'
	nnoremap <silent> <expr> gc comment.Toggle()
	xnoremap <silent> <expr> gc comment.Toggle()
	nnoremap <silent> <expr> gcc comment.Toggle() .. '_'

Something like this?

Can you please also add yourself in the header of the autoload script as upstream author? And please also as Codeowner. We may also need to update the Filelist

[clason]

Would it make sense to move the autoload to pack/dist/opt/comment as well then?

[habamax]

It doesn't feel right to add help entry into filetype.txt though.

[clason]

It doesn't feel right to add help entry into filetype.txt though.

We put it in various.txt: https://github.com/neovim/neovim/blob/a736e845a48c5ccdcfeb4ea485aa859a04b35d59/runtime/doc/various.txt#L560-L597

[chrisbra]

Thanks. I would move it to around here:

vim/runtime/doc/usr_05.txt

Line 440 in 98b12ed

so it's close to the editorconfig and matchit install instructions.

We should also document the use of 'commentstring' option. Also that it won't do anything if this option isn't set for a particular filetype and how to set this to make gc work. The Neovim doc looks quite clear in this regard.

I am wondering, whether we should add help-tags for gc. That will certainly conflict with tpopes commentary plugin. So not sure if this is a particular good idea or not.

[clason]

I am wondering, whether we should add help-tags for gc. That will certainly conflict with tpopes commentary plugin. So not sure if this is a particular good idea or not.

We did, because otherwise :h gc won't work because there are tags with a higher score. And conflicts (E154) are only triggered by duplicate tags in the same directory? @zeertzjq

[zeertzjq]

Since this is an optional plugin, maybe mapping tags like gc should be added to runtime/pack/dist/opt/comment/doc/ instead (like matchit), so that they are only found when the plugin is loaded.

[habamax]

We should also document the use of 'commentstring' option. Also that it won't do anything if this option isn't set for a particular filetype and how to set this to make gc work. The Neovim doc looks quite clear in this regard.

If it would wait another week or so, or anyone else would be able to add this documentation.

[chrisbra]

please let the choice back to users, there lots wonderful vim plugins, it should be not possible to add them all within vim,
besides some users specifically may just like tpopes' commentary (e.g me), so that conflict may not be liked by amount of people.

It's completly optional. You will need to use packadd to use it. Or simply use your favorite other plugin. And it makes sense, to add the plugin specific documentation into the package itself.

Thanks

[chrisbra]

Thanks all. I have included it and adjusted the documentation.

@habamax I made a simple change to the plugin, so that it doesn't error out for non-modifiable buffers:

vim/runtime/pack/dist/opt/comment/autoload/comment.vim

Line 18 in 5400a5d

if empty(&cms) || !&ma | return '' | endif

[ColinKennedy]

Related: neovim/neovim#28176

[habamax]

Thanks, @chrisbra!

[girishji]

Thank you, @habamax and @chrisbra :)