Prepopulate blacklist variable

[xeruf]

I wanted to leave the original blacklist untouched and simply append a type (btw, even though it is a custom one from taskwarrior, you could add that in natively, because you should never highlight or strip white-space in that file - it is prepopulated with lots of trailing white-spaces and will be trimmed automatically on save):

let g:better_whitespace_filetypes_blacklist += ['taskedit']

But I got the error that the variable was undefined - how about predefining that variable so that we can extend it?
My concern here is that if you update the blacklist, I would have to manually update mine. Also DRY.

[ntpeters]

The variable is predefined, but plugins aren't yet loaded while your vimrc is being read. Setting an auto command to append to the list after startup should work:

autocmd VimEnter * let g:better_whitespace_filetypes_blacklist += ['taskedit']

[xeruf]

Ah, that makes sense, thanks! But unfortunately, this doesn't seem to work :/

[ntpeters]

Hm, looks like that's due to the plugin setting everything up on FileType, WinEnter, and BufWinEnter events, all of which fire before VimEnter... 😕

I suppose a workaround would be to just disable it for that file type (with a check to prevent any errors if you ever don't load the plugin):

autocmd FileType taskedit if exists(":DisableWhitespace") | execute ":DisableWhitespace" | endif

@Cimbali, any ideas on a better way to handle this?

[xeruf]

Yes, this works for now, thank you :)

[Cimbali]

I’m afraid I don’t have a better solution right now. I can see 2 only options:

• copy the blacklist, or
• add an “append to blacklist“ option

[Cimbali]

Actually the VimEnter technique works for me in Vim 8.1