nixos-config/home/neovim.nix

{ pkgs, lib, inputs, config, ...}:
{
  programs.neovim = {
    enable = true;
    defaultEditor = true;
    viAlias = true;
    vimAlias = true;
    vimdiffAlias = true;
    plugins = with pkgs.vimPlugins; [
      lightline-vim
      vim-lightline-coc

      vim-commentary
      vim-fugitive

      nerdtree
      nerdtree-git-plugin
      vim-devicons

      nvim-lspconfig
      copilot-vim
      nvim-treesitter

      coc-css
      coc-go
      coc-html
      coc-json
      coc-nvim
      coc-pyright

      vim-nix
    ];

    extraConfig = ''
      let mapleader = ','
      set number
      set shiftwidth=2
      set tabstop=2
      set expandtab

      " Integrate status with lightline
      let g:lightline = {
        \   'active': {
        \     'left': [[  'coc_info', 'coc_hints', 'coc_errors', 'coc_warnings', 'coc_ok' ], [ 'coc_status'  ]]
        \   }
        \ }

      " register components:
      call lightline#coc#register()

      " GoTo code navigation.
      nmap <silent> gd <Plug>(coc-definition)
      nmap <silent> gy <Plug>(coc-type-definition)
      nmap <silent> gi <Plug>(coc-implementation)
      nmap <silent> gr <Plug>(coc-references)

      " Use K to show documentation in preview window.
      nnoremap <silent> K :call ShowDocumentation()<CR>
      function! ShowDocumentation()
        if CocAction('hasProvider', 'hover')
          call CocActionAsync('doHover')
        else
          call feedkeys('K', 'in')
        endif
      endfunction

      " Enable syntax folding with coc
      command! -nargs=* Fold :call CocAction('fold', <f-args>)

      inoremap <silent><expr> <CR> coc#pum#visible() ? coc#pum#confirm()
                                    \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"

      " Highlight the symbol and its references when holding the cursor.
      autocmd CursorHold * silent call CocActionAsync('highlight')

      " Symbol renaming.
      nmap <leader>rn <Plug>(coc-rename)

      " Use CTRL-S for selections ranges.
      " Requires 'textDocument/selectionRange' support of language server.
      nmap <silent> <C-s> <Plug>(coc-range-select)
      xmap <silent> <C-s> <Plug>(coc-range-select)

      " Step through diagnostics
      nmap <silent> <g <Plug>(coc-diagnostic-prev)
      nmap <silent> >g <Plug>(coc-diagnostic-next)

      " Nerdtree-settings
      " Toggle nerdtree on Ctrl+t
      nmap <silent> <C-t> :NERDTreeToggle<CR>
      autocmd VimEnter * NERDTree " Autostart nerdtree on vim startup
      autocmd VimEnter * wincmd p " Unselect nerdtree window
      " Close vim is Nerdtree is the only buffer left
      autocmd bufenter * if (winnr("$") == 1 && exists("b:NERDTree") && b:NERDTree.isTabTree()) | q | endif

      " List and switch buffers on Ctrl+k
      nnoremap <C-k> :set nomore <Bar> :ls <Bar> :set more <CR>:b<Space>

      " Show trailing whitespace
      highlight ExtraWhitespace ctermbg=red guibg=red
      match ExtraWhitespace /\s\+$/

      " Disable search highlights
      map <Leader><Space> :noh<CR>
    '';
  };
}