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Adding a filter function to a shell process

From: Louis Höfler
Subject: Adding a filter function to a shell process
Date: Thu, 05 Mar 2015 02:16:37 +0100
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

Hello everyone,
I try to read output from a (shell "buffer") call, to a string.
I came up with this function:
(defun eide-shell-read-filter (process string)
 (setq eide-shell-output-temp string)

(defun ei-shell-read (procid cmd)
"This function sends commands to a opened shell and stores it's output into a variable"
 (eide-debug-message "ei-shell-read: cmd = %s" cmd)
(eide-debug-message "ei-shell-read: process-filter = %S" (process-filter (get-process "shell"))) (add-function :after (process-filter (get-process "shell")) #'eide-shell-read-filter)
 (process-send-string procid (concat cmd "\n"))
(remove-function (process-filter (get-process "shell")) #'eide-shell-read-filter) (eide-debug-message "ei-shell-read: command output = %s" eide-shell-output-temp)

But the above code produces this error for M-x ei-interactive-shell:
Debugger entered--Lisp error: (void-variable v)
  (process-filter v)
  (lambda nil (process-filter v))()
advice--add-function(:after ((lambda nil (process-filter v)) lambda (gv--val) (set-process-filter v gv--val)) eide-shell-read-filter nil)
  ei-shell-read("*msys2-64*" "export")

You can download the full sourcecode of the project here http://scm.mathematek.de/repos.cgi/emacside

Can someone help me with this problem?
Thank you, Louis

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