nethack code to check if a character has something in the inventory

(defvar nethack-temp-log nil "String containing captured messages.")

(defun nethack-has-item-p (regexp)
  "Return non-nil if the character has an item matching REGEXP in the inventory."
  (let ((nh-filter-hook (append (list 'nethack-store-log) nh-filter-hook))
        (nethack-temp-log nil))
    (nh-send-and-wait "inv 1")
    (nh-send nil)
    (string-match regexp nethack-temp-log)))

(defun nethack-store-log (string)
  (setq nethack-temp-log (concat nethack-temp-log string "\n")))

(defvar nh-filter-hook nil "Hook that is called with the received line.")

(defadvice nh-filter (around sacha activate)
  "Insert contents of STRING into the buffer associated with PROC.
Evaluate the buffer contents if we are looking at a prompt and then
delete the contents, perhaps logging the text."
  ;; insert output into process buffer
  (with-current-buffer (process-buffer proc)
    (goto-char (point-max))
    (insert string)
    (forward-line 0)
    (if (looking-at nh-prompt-regexp)
	(let ((prompt (match-string 1)))
          (nh-log (buffer-substring (point-min) (point)))
          (unless (run-hook-with-args-until-success 'nh-filter-hook (buffer-substring (point-min) (point)))
	    (eval-region (point-min) (point)))
	  (cond ((or (equal prompt "command")
		     (equal prompt "menu"))
		 (nh-print-status)
		 (sit-for 0)
		 (setq nh-at-prompt t)))))))