.vimrc

"vim tab mapping for default autocomplete
:function AutoComplete()
:  if len(matchstr(getline('.')[col('.')-2], "[^ \t\n]*$")) > 0
:    return "\<C-N>"
:  else
:    return "\<TAB>"
:  endif
:endfunction

inoremap <silent> <TAB> <C-R>=AutoComplete()<CR>

"add git grep to vim
function! GitGrep(search_token)
  :cgete system('git grep -n ' . a:search_token)
  :copen
endfunction
command! -nargs=1 GitGrep call GitGrep("<args>")
:nnoremap <S-f> :GitGrep
:nnoremap <S-Right> :cnext<CR>
:nnoremap <S-Left> :cprev<CR>