update vim2 config

vim2/.vimrc

@@ -6,18 +6,33 @@ set cindent
 set mouse=a
 set number
 set relativenumber
+set ignorecase
+
+let &t_EI = "\<Esc>[2 q"
+let &t_SI = "\<Esc>[6 q"
 
 syntax on
-colorscheme habamax
-filetype plugin on
+filetype plugin indent on
+
+if !isdirectory($HOME."/.vim/undo-dir")
+    call mkdir($HOME."/.vim/undo-dir", "", 0700)
+endif
+
+set undodir=~/.vim/undo-dir
+set undofile
 
 call plug#begin()
 Plug 'tpope/vim-sensible'
 Plug 'sheerun/vim-polyglot'
 Plug 'joe-skb7/cscope-maps'
 Plug 'vimsence/vimsence'
+Plug 'preservim/nerdcommenter'
+Plug 'tomasiser/vim-code-dark'
 call plug#end()
 
+colorscheme codedark
+
+noremap <C-_> <plug>NERDCommenterInvert
 nnoremap gd :cscope find g <C-R><C-W><CR>
 nnoremap gf :cscope find f <C-R><C-W><CR>
-vnoremap <silent> <C-c> :w !wl-copy<CR><CR>
+vnoremap <silent> <C-c> y:call system('wl-copy', @")<CR>