grep (ag) text under cursor

.vimrc

let mapleader = ","

"""""""""""""""""""""""""
" ag command
"""""""""""""""""""""""""
map <leader>g :call GrepTextUnderCursor()<CR>

function! GrepTextUnderCursor()
  let word_under_cursor = expand("<cword>")
  exec ":Ag! " . word_under_cursor
endfunction


""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
" disable arrow keys so you get used to moving with hjkl
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
map <Left> <Nop>
map <Right> <Nop>
map <Up> <Nop>
map <Down> <Nop>

" Move around splits with <c-hjkl>
nnoremap <c-j> <c-w>j
nnoremap <c-k> <c-w>k
nnoremap <c-h> <c-w>h
nnoremap <c-l> <c-w>l