Xieby1's Nix/NixOS Config

{ config, pkgs, stdenv, lib, ... }:
let
  opt = import ../../../opt.nix;
in {

Plugins with customizations:

  imports = [
    ./nvim-metals
    ./conform-nvim.nix
    ./nvim-lspconfig.nix
    ./nvim-cmp.nix
    ./vim-mark.nix
    ./DrawIt.nix
    ./nvim-treesitter.nix
    ./nvim-config-local.nix
    ./leap-nvim.nix
    ./telescope-nvim.nix
    ./git-wip.nix
    ./vim-floaterm.nix
    ./vista-vim.nix
    ./vim-markdown.nix
    ./vim-hexokinase.nix
    ./gitsigns-nvim.nix
    ./color-scheme.nix
    ./hbac-nvim.nix
    ./winshift-nvim.nix
    ./smartyank-nvim.nix
    ./mini-nvim.nix
    ./vim-easy-align.nix
  ];

  programs.bash.shellAliases.view = "nvim -R";

Set nvim as manpager. see nvim :h :Man. nvim manpage huge mange is SLOW! E.g. man configuration.nix.

  programs.bash.shellAliases.nman = "env MANPAGER='nvim +Man!' man";

  programs.neovim = {
    enable = true;
    viAlias = true;
    vimAlias = true;
    vimdiffAlias = true;

Plugins without customizations:

    plugins = with pkgs.vimPlugins; [
      vim-smoothie
      vim-fugitive
      vim-nix
      vim-markdown-toc
      vim-commentary
      tabular
      vim-plugin-AnsiEsc
    ] ++ (lib.optional opt.isGui markdown-preview-nvim);

Vim config

    extraConfig = ''
      " vim
      "" Highlight searches
      set hlsearch
      nnoremap <F3> :nohlsearch<CR>
      "" Show line number
      set number
      "" Always show the signcolumn, otherwise it would shift the text each time
      "" diagnostics appear/become resolved
      set signcolumn=number
      "" indent
      "set smartindent " not good, indentation in empty line cannot be auto removed
      """ show existing tab with 4 spaces width
      set tabstop=4
      """ when indenting with '>', use 4 spaces width
      set shiftwidth=4
      """ specicial indent
      au FileType markdown setlocal shiftwidth=2 tabstop=2
      """ On pressing tab, insert 4 spaces
      set expandtab
      """ line wrap with ident
      set breakindent
      """" horizontally scroll 4 characters
      nnoremap z<left> 4zh
      nnoremap z<right> 4zl
      "" tags support, ';' means upward search, refering to http://vimdoc.sourceforge.net/htmldoc/editing.html#file-searching
      set tags=./tags;
      "" Fold
      """ fold text to be the first and last line
      """ refer to sbernheim4's reply at
      """ https://github.com/nvim-treesitter/nvim-treesitter/pull/390
      function! GetSpaces(foldLevel)
          if &expandtab == 1
              " Indenting with spaces
              let str = repeat(" ", a:foldLevel / (&shiftwidth + 1) - 1)
              return str
          elseif &expandtab == 0
              " Indenting with tabs
              return repeat(" ", indent(v:foldstart) - (indent(v:foldstart) / &shiftwidth))
          endif
      endfunction
      function! MyFoldText()
          let startLineText = getline(v:foldstart)
          let endLineText = trim(getline(v:foldend))
          let indentation = GetSpaces(foldlevel("."))
          let spaces = repeat(" ", 200)
          let str = indentation . startLineText . " …… " . endLineText . spaces
          return str
      endfunction
      "" toggle foldmethod between manual and indent
      set foldmethod=indent
      :function ToggleFoldmethod()
      : if (&foldmethod == "manual")
      :   set foldmethod=indent
      : else
      :   set foldmethod=manual
      : endif
      :endfunction
      nnoremap <Leader>z :call ToggleFoldmethod()<CR>:echo &foldmethod<CR>
      "" Custom display for text when folding
      set foldtext=MyFoldText()
      """ Set the foldlevel to a high setting,
      """ files are always loaded with opened folds.
      set foldlevel=20
      """ mouse support " select by pressing shift key!
      set mouse=a
      """ matchit.vim " :h matchit-install
      packadd! matchit
      "" Preview
      nnoremap <leader>[ :pc<CR>
      "" highlight unwanted whitespace
      set list
      set listchars=tab:>-,trail:-
      "" syntax
      syntax on
      "" backspace
      set backspace=indent,eol,start
      "" wrap line
      """ https://stackoverflow.com/questions/248102/is-there-any-command-to-toggle-enable-auto-text-wrapping
      :function ToggleWrap()
      : if (&wrap == 1)
      :   set nowrap
      : else
      :   set wrap
      : endif
      :endfunction
      nnoremap <F9> :call ToggleWrap()<CR>
      set updatetime=400
      "" highlight current line
      set cursorlineopt=number
      augroup CursorLine
        au!
        au VimEnter,WinEnter,BufWinEnter * setlocal cursorline
        au WinLeave * setlocal nocursorline
      augroup END

      " filetype
      augroup filetype
          " detect LLVM IR file
          au! BufRead,BufNewFile *.ll     set filetype=llvm
          " cpp " from gem5
          au! BufRead,BufNewFile *.hh.inc,*.cc.inc set filetype=cpp
      augroup END

      " set terminal title
      "" https://stackoverflow.com/questions/15123477/tmux-tabs-with-name-of-file-open-in-vim
      autocmd BufEnter * let &titlestring = "" . expand("%:t")
      set title

      nnoremap <F10> :echo "hi<" . synIDattr(synID(line("."),col("."),1),"name") . '> trans<'
      \ . synIDattr(synID(line("."),col("."),0),"name") . "> lo<"
      \ . synIDattr(synIDtrans(synID(line("."),col("."),1)),"name") . ">"<CR>

      " highlight
      augroup HiglightTODO
          autocmd!
          autocmd WinEnter,VimEnter * :silent! call matchadd('Todo', 'TODO', -1)
      augroup END

      " wildmenu
      " see: https://github.com/neovim/neovim/pull/11001
      cnoremap <expr> <Up>    pumvisible() ? "\<Left>"  : "\<Up>"
      cnoremap <expr> <Down>  pumvisible() ? "\<Right>" : "\<Down>"
      cnoremap <expr> <Left>  pumvisible() ? "\<Up>"    : "\<Left>"
      cnoremap <expr> <Right> pumvisible() ? "\<Down>"  : "\<Right>"
    '';
  };
}