feat(nvim): add oil.nvim back

.vimrc

@@ -119,6 +119,7 @@ Plug 'tpope/vim-fugitive'
 Plug 'Yggdroot/indentLine'
 Plug '907th/vim-auto-save'
 Plug 'markonm/traces.vim'
+Plug 'stevearc/oil.nvim'
 
 call plug#end()
 
@@ -328,7 +329,8 @@ let g:airline_right_sep = ''
 let g:airline_right_alt_sep = ''
 
 " fix c++ comment style in Neovim
-autocmd FileType cpp setl commentstring=//\ %s
+" ref: https://github.com/tpope/vim-commentary/issues/15#issuecomment-23127749
+autocmd FileType c,cpp,cs,java setlocal commentstring=//\ %s
 
 " Why?!
 set noshowmode

home-manager/home.nix

@@ -108,6 +108,16 @@ in {
         set packpath+=${config.home.homeDirectory}/.vim
         source ${config.home.homeDirectory}/.vimrc
         set undodir=${config.home.homeDirectory}/.vim/undofiles
+        lua require('config')
+      '';
+    };
+    "nvim/lua/config.lua" = {
+      text = ''
+        require('oil').setup {
+          view_options = {
+            show_hidden = true,
+          },
+        }
       '';
     };
     "nvim/ftplugin/java.lua" = {