Paste this into your .emacs
, reload it, and M-x ack:
;; https://code.google.com/p/emacs-nav/issues/detail?id=91
(defvar ack-command "ack --nogroup --nocolor ")
(defvar ack-history nil)
(defvar ack-host-defaults-alist nil)
(defun ack ()
"Like grep, but using ack-command as the default"
(interactive)
; Make sure grep has been initialized
(if (>= emacs-major-version 22)
(require 'grep)
(require 'compile))
; Close STDIN to keep ack from going into filter mode
(let ((null-device (format "< %s" null-device))
(grep-command ack-command)
(grep-history ack-history)
(grep-host-defaults-alist ack-host-defaults-alist))
(call-interactively 'grep)
(setq ack-history grep-history
ack-host-defaults-alist grep-host-defaults-alist)))
