vim: replace ag.vim with grepprg setting

ag.vim is deprecated and has unclear licensing.

https://github.com/rking/ag.vim/issues/124#issuecomment-227038003

1 files changed, 2 insertions, 0 deletions

diff --git a/vimrc b/vimrc
index 2c6da3e..658bdf4 100644
--- a/vimrc
+++ b/vimrc
@@ -28,6 +28,8 @@ set encoding=utf-8          " use utf8 by default
 set number                  " enable line numbers
 set relativenumber          " show relative line numbers
 set backspace=indent,eol,start      " enable backspacing
+set grepprg=ag\ --vimgrep   " use Ag for grepping
+set grepformat=%f:%l:%c:%m  " Ag-specific output format
 syntax on                   " enable syntax highlighting
 filetype plugin indent on