dotfiles/nix/lib/vim.nix

{ pkgs, lib, ... }: {
  programs.vim = {
    enable = true;
    defaultEditor = true;
    settings = {
      background = "dark";
      expandtab = true;
      number = true;
      shiftwidth = 2;
      tabstop = 2;
    };
    plugins = with pkgs.vimPlugins; [
      nerdcommenter
      vim-go
      vim-sensible
      vim-trailing-whitespace
    ];
    extraConfig = ''
      " Tmux integration to switch panes with Ctrl+{hkjl}
      if exists('$TMUX')
        function! TmuxOrSplitSwitch(wincmd, tmuxdir)
          let previous_winnr = winnr()
          silent! execute "wincmd " . a:wincmd
          if previous_winnr == winnr()
            call system("tmux select-pane -" . a:tmuxdir)
            redraw!
          endif
        endfunction

        let previous_title = substitute(system("tmux display-message -p '#{pane_title}'"), '\n', "", "")
        let &t_ti = "\<Esc>2;vim\<Esc>\\" . &t_ti
        let &t_te = "\<Esc>2;". previous_title . "\<Esc>\\" . &t_te

        nnoremap <silent> <C-h> :call TmuxOrSplitSwitch('h', 'L')<cr>
        nnoremap <silent> <C-j> :call TmuxOrSplitSwitch('j', 'D')<cr>
        nnoremap <silent> <C-k> :call TmuxOrSplitSwitch('k', 'U')<cr>
        nnoremap <silent> <C-l> :call TmuxOrSplitSwitch('l', 'R')<cr>
      else
        map <C-h> <C-w>h
        map <C-j> <C-w>j
        map <C-k> <C-w>k
        map <C-l> <C-w>l
      endif

      " coding preference
      filetype off
      filetype plugin indent on

      syntax on
      set backspace=indent,eol,start
      set noautoindent
      set noswapfile
      set ruler
      set showmatch
      set smarttab
      set sts=2
      let g:NERDSpaceDelims=1

      let mapleader=","
      if has("autocmd")
        autocmd FileType go set ts=2 sw=2 sts=2 noet nolist autowrite
      endif
    '';
  };
}