set history=100             " keep 100 lines of command line histories
set ignorecase
set smartcase
set wrapscan                " Searches wrap around the end of the file
" While typing a search command, show where the pattern matches
set incsearch
set hlsearch                " highlighting matches
" turn off highlight by Esc x 2
nmap <ESC><ESC> :<C-u>nohlsearch<CR><ESC>
augroup Search
    autocmd!
    autocmd QuickFixCmdPost *grep cwindow
augroup END