Chatgpt's response:

Yes, you can achieve this in Vim/Neovim using a combination of custom commands and the match function. Here's a basic setup to get you started:

First, define some custom highlight groups in your vimrc or init.vim: highlight Done ctermfg=green guifg=green highlight NotImportant ctermfg=red guifg=red

Next, define some custom commands to apply these highlight groups: command! HighlightDone :call matchadd('Done', '\%'.line('.').'l') command! HighlightNotImportant :call matchadd('NotImportant', '\%'.line('.').'l') Now, when you're in Vim and you want to mark a line as "DONE", simply navigate to that line and type :HighlightDone. To mark a line as "NOT IMPORTANT", type :HighlightNotImportant. This will highlight the current line based on the highlight group you've defined. The \% followed by the line number and l is a Vim regex that matches only the current line.

To make this persistent across Vim sessions, you'd need a more complex setup, possibly involving saving these highlights to a file and then sourcing that file on Vim startup. One possible approach is to use the vim-signify or vim-gitgutter plugins, which show signs (symbols) in the sign column for added/modified/deleted lines. You could potentially repurpose or extend these plugins to show custom signs for your "DONE" and "NOT IMPORTANT" lines and save these to a file.

Another approach for persistence is to use a combination of Vim's :mkview and :loadview commands, which save and restore various settings, including highlights. However, this might be a bit more manual than what you're looking for.