How to setup AG (the silver searcher) in Vim?

Question

I am using AG to simplifying and improve the search in my Vim. I remapped K to search for the current selected word as follows:

if executable('ag')
  set grepprg=ag\ --nogroup\ --nocolor
  command -nargs=+ -complete=file -bar Ag silent! grep! <args>|cwindow|redraw!

  nnoremap K :grep! "\b<C-R><C-W>\b"<CR>:cw<CR>
  nnoremap ff :Ag<SPACE>
endif

However this doesn't work as expected. When I hit the keyboard K, a small windows opens up in the bottom, showing the following message:

Then, I hit Enter and it goes to the results. How can I avoid this window message and go directly to the result page?

Answer 1

I use silver searcher too and actually I ended up with this binding:

nnoremap K :silent grep! "\b\s?<C-R><C-W>\b"<CR>:cw<CR>:redr!<CR>

See at :redr! command at the end it cause to redrawing whole screen because sometime after opening results in terminal window, vim doesn't redraw whole screen.

And also there is \s? in regular expression. Without it vim would delete first b letter of the word.