tgroshon/alacritty-tmux-vim_truecolor.md

## alacritty-tmux-vim_truecolor.md

      
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              alacritty-tmux-vim_truecolor.md
            
          
    True Color (24-bit) and italics with alacritty + tmux + vim (neovim)

This should make True Color (24-bit) and italics work in your tmux session and vim/neovim when using Alacritty (and should be compatible with any other terminal emulator, including Kitty).
Testing colors

Running this script should look the same in tmux as without.
curl -s https://gist.githubusercontent.com/lifepillar/09a44b8cf0f9397465614e622979107f/raw/24-bit-color.sh >24-bit-color.sh
bash 24-bit-color.sh

Configuration files

⚠️ IMPORTANT ⚠️ Don't set $TERM in your shell (zshrc, bashrc, etc.), but your terminal (alacritty).
Alacritty

In ~/.config/alacritty/alacritty.yml:
env:
  TERM: xterm-256color
tmux

In ~/.tmux.conf (or ~/.config/tmux/tmux.conf):
set -g default-terminal "tmux-256color"
set -ag terminal-overrides ",xterm-256color:RGB"

# Or use a wildcard instead of forcing a default mode.
# Some users in the comments of this gist have reported that this work better.
#set -sg terminal-overrides ",*:RGB"

# You can also use the env variable set from the terminal.
# Useful if you share your configuration betweeen systems with a varying value.
#set -ag terminal-overrides ",$TERM:RGB"
vim

In ~/.vimrc:
" You might have to force true color when using regular vim inside tmux as the
" colorscheme can appear to be grayscale with "termguicolors" option enabled.
if !has('gui_running') && &term =~ '^\%(screen\|tmux\)'
  let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
  let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
endif

syntax on
set termguicolors
colorscheme yourfavcolorscheme
neovim


If you use ~/.vimrc for your nvim configuration, use the above vim example because it's fully compatible.

In ~/.config/nvim/init.vim
set termguicolors
colorscheme yourfavcolorscheme
Or ~/.config/nvim/init.lua:
vim.o.termguicolors = true
vim.cmd'colorscheme yourfavcolorscheme'
Not working correctly ?

Check out the comments below for possible solutions.
And if you found another solution I would really appreciate if you left a comment with instructions and the following information:

OS/Distro + version
Vim or Neovim + version
Terminal name + version

Mentions

Shout-out to the nice folks that provided insightful feedback:

@mikeslattery black and white vim colorscheme
@sahibalejandro env variable inside tmux configuration
@wonbinbk wildcard in tmux terminal configuration