Ack or Ag in vim

" Add this to your .vimrc and you will be able to use ':Ag <pattern>' to silver search from wherever you opened vim.
" You can also use 'ack' or whatever you want to use as a search tool as long as you have it installed.
if executable('ag')
  set grepprg=ag\ --nogroup\ --nocolor
  command! -nargs=+ -complete=file -bar Ag silent! grep! <args>|cwindow|redraw!
endif

" When you use ':Ag <pattern>' you can quickly look through / search each file containing the pattern and pick one to edit.

" YOU CAN ALSO DO ':cfdo <command>' TO RUN A COMMMAND ON EACH FILE IN THE SEARCH RESULT!!!
" For example, ":Ag 'oh hey'" will find every file with 'oh hey' in it, and then ':cfdo %s/oh hey/hi there/g'
" will replace every instance of 'oh hey' with 'hi there' in each file in the search result!