nvim/nvim-config/goyo.vim

" Color name (:help cterm-colors) or ANSI code
let g:limelight_conceal_ctermfg = 'gray'
let g:limelight_conceal_ctermfg = 240

function! s:goyo_enter()
  if executable('tmux') && strlen($TMUX)
    silent !tmux set status off
    silent !tmux list-panes -F '\#F' | grep -q Z || tmux resize-pane -Z
  endif
  set noshowcmd
  set noshowmode
  set scrolloff=999
  set spell spelllang=en_us
  set wrap
  set nolist
  set linebreak
  Limelight
endfunction

function! s:goyo_leave()
  if executable('tmux') && strlen($TMUX)
    silent !tmux set status on
    silent !tmux list-panes -F '\#F' | grep -q Z && tmux resize-pane -Z
  endif
  set nospell
  set nowrap
  set scrolloff=5
  set showcmd
  set showmode
  Limelight!
endfunction

autocmd! User GoyoEnter nested call <SID>goyo_enter()
autocmd! User GoyoLeave nested call <SID>goyo_leave()