Variant always dark in neovim

[adben27]

I have done the following steps before reporting this issue:

• [X] I have searched the existing issues
• [X] I have read the FAQ in the help doc

Operating system/version

Fedora 37

Terminal emulator/version

kitty 0.26.5

$TERM environment variable

xterm-kitty

Tmux version

No response

Feature matrix

coc: health#coc#check
========================================================================
  - OK: nvim version satisfied
  - OK: Environment check passed
  - OK: Javascript bundle build/index.js found
  - OK: Service started

man: require("man.health").check()
========================================================================
  - OK: plugin/man.vim not in $VIMRUNTIME
  - OK: autoload/man.vim not in $VIMRUNTIME

nvim: health#nvim#check
========================================================================
## Configuration
  - OK: no issues found

## Performance
  - OK: Build type: RelWithDebInfo

## Remote Plugins
  - OK: Up to date

## terminal
  - INFO: key_backspace (kbs) terminfo entry: key_backspace=\177
  - INFO: key_dc (kdch1) terminfo entry: key_dc=\E[3~
  - INFO: $COLORTERM='truecolor'

provider: health#provider#check
========================================================================
## Clipboard (optional)
  - OK: Clipboard tool found: xsel

## Python 3 provider (optional)
  - INFO: Using: g:python3_host_prog = "/usr/bin/python3"
  - INFO: Executable: /usr/bin/python3
  - INFO: Python version: 3.11.2
  - INFO: pynvim version: 0.4.3
  - OK: Latest pynvim is installed.

## Python virtualenv
  - OK: no $VIRTUAL_ENV

## Ruby provider (optional)
  - INFO: Ruby: ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
  - WARNING: `neovim-ruby-host` not found.
    - ADVICE:
      - Run `gem install neovim` to ensure the neovim RubyGem is installed.
      - Run `gem environment` to ensure the gem bin directory is in $PATH.
      - If you are using rvm/rbenv/chruby, try "rehashing".
      - See :help |g:ruby_host_prog| for non-standard gem installations.
      - You may disable this provider (and warning) by adding `let g:loaded_ruby_provider = 0` to your init.vim

## Node.js provider (optional)
  - INFO: Node.js: v18.15.0
  - WARNING: Missing "neovim" npm (or yarn, pnpm) package.
    - ADVICE:
      - Run in shell: npm install -g neovim
      - Run in shell (if you use yarn): yarn global add neovim
      - Run in shell (if you use pnpm): pnpm install -g neovim
      - You may disable this provider (and warning) by adding `let g:loaded_node_provider = 0` to your init.vim

## Perl provider (optional)
  - WARNING: "Neovim::Ext" cpan module is not installed
    - ADVICE:
      - See :help |provider-perl| for more information.
      - You may disable this provider (and warning) by adding `let g:loaded_perl_provider = 0` to your init.vim

vim.lsp: require("vim.lsp.health").check()
========================================================================
  - INFO: LSP log level : WARN
  - INFO: Log path: /home/adsys/.local/state/nvim/lsp.log
  - INFO: Log size: 0 KB

vim.treesitter: require("vim.treesitter.health").check()
========================================================================
  - INFO: Runtime ABI version : 14

Minimal vimrc that can reproduce this bug.

call plug#begin()
Plug 'sainnhe/gruvbox-material'
Plug 'itchyny/lightline.vim'
call plug#end()

if has('termguicolors')
   set termguicolors
endif
colorscheme gruvbox-material

set laststatus=2
set noshowmode
let g:lightline={}
let g:lightline.colorscheme = 'gruvbox_material'

Steps to reproduce this bug using minimal vimrc

1. "Link" init.vim to .vimrc with

   set runtimepath^=~/.vim runtimepath+=~/.vim/after
   let &packpath = &runtimepath
   source ~/.vimrc

2. Launch vim and see that the theme of lightline is correct.

3. Launch nvim and see that the theme is dark even if background is light

Expected behavior

Having lightline light theme when background is light.

Actual behavior

The lightline theme is dark even if background is light

[antoineco]

You need set background=light in your vimrc. Neovim defaults to "dark".

[antoineco]

In case this doesn't work, or if you prefer the light/dark background to be determined automatically, I recommend using an autocmd as the one below to reload lightline upon colorscheme changes (this will also be executed during the initial loading of the colorscheme):

-- Reload lightline on colorscheme change.
-- Must be declared before executing ':colorscheme'.
grpid = vim.api.nvim_create_augroup('lightline_reload_colorscheme', {})
vim.api.nvim_create_autocmd('ColorScheme', {
  group = grpid,
  pattern = '*',
  command = 'call nviminit#lightline#SetColorscheme() | ' ..
            'call nviminit#lightline#Reload()'
})

Where the two functions from the command are something like:

https://github.com/antoineco/dotfiles/blob/91d0e4b7/nvim/autoload/nviminit/lightline.vim

[adben27]

First, thanks for your answer. But I wonder if you could help me on this.

I want to set background depending on the kitty theme (it's changed with the GNOME extension Night Theme Switcher at sunset/rise time)

So, i found a way to extract only the name of the current kitty theme, but i just can't figure out how to make it work. I'm quite a noob at vimscript.

So, here is my idea.

let ${KITTY_THEME}={grep -Po '## name: \K[^"]*' ~/.config/kitty/current-theme.conf}
if(KITTY_THEME == 'Gruvbox Material Light Medium') 
    set background=light
else
    set background=dark
endif

[antoineco]

A similar use case is described in details here: https://arslan.io/2021/02/15/automatic-dark-mode-for-terminal-applications/

I think you should be able to achieve something similar with your setup.