Add stuff to neovim

nixpkgs/programs/neovim.nix

@@ -1,4 +1,4 @@
-{ pkgs, home, colorTheme, ... }:
+{ pkgs, home, ... }:
 {
   programs.neovim = {
     enable = true;
@@ -8,6 +8,7 @@
     vimdiffAlias = true;
 
     plugins = with pkgs.vimPlugins; [
+      direnv-vim
       vim-commentary
       vim-gitgutter
       fzf-vim
@@ -17,7 +18,48 @@
       vim-fugitive
       vim-css-color
       semshi
-      goyo-vim
+      {
+        plugin = goyo-vim;
+
+        # TODO: The mapleader definition should be in extraConfig, but setting
+        #       the mapleader before defining keymaps messes things up.
+        config = ''
+          let mapleader = " "
+
+          let g:goyo_width = '90%'
+          let g:goyo_height = '85%'
+          let g:goyo_linenr = 1
+
+          function! s:goyo_enter()
+            if executable('tmux') && strlen($TMUX)
+              silent !tmux set status off
+              silent !tmux list-panes -F '\#F' | grep -q Z || tmux resize-pane -Z
+            endif
+            set noshowmode
+            set noshowcmd
+            set scrolloff=999
+            Limelight
+            " ...
+          endfunction
+
+          function! s:goyo_leave()
+            if executable('tmux') && strlen($TMUX)
+              silent !tmux set status on
+              silent !tmux list-panes -F '\#F' | grep -q Z && tmux resize-pane -Z
+            endif
+            set showmode
+            set showcmd
+            set scrolloff=5
+            Limelight!
+            " ...
+          endfunction
+
+          autocmd! User GoyoEnter nested call <SID>goyo_enter()
+          autocmd! User GoyoLeave nested call <SID>goyo_leave()
+
+          nnoremap <leader>z :Goyo<CR>
+        '';
+      }
       limelight-vim
       vim-tmux-navigator
       vim-polyglot
@@ -46,6 +88,16 @@
     extraConfig =  ''
       set clipboard+=unnamedplus
       set number relativenumber
+
+      set undofile
+      set undodir=~/.cache/vim/undodir
+
+      nnoremap <A-j> :m .+1<CR>==
+      nnoremap <A-k> :m .-2<CR>==
+      inoremap <A-j> <Esc>:m .+1<CR>==gi
+      inoremap <A-k> <Esc>:m .-2<CR>==gi
+      vnoremap <A-j> :m '>+1<CR>gv=gv
+      vnoremap <A-k> :m '<-2<CR>gv=gv
     '';
   };