How do you disable the buffer end/beginning warnings in the minibuffer?

Question

I see that I can do something like this:

(defun limit-warnings ()
  (set (make-local-variable 'warning-minimum-level) 'fatal))

(add-hook 'minibuffer-setup-hook 'disable-warnings)

(Sorry for syntax errors; I'm not very familiar with Lisp and the above is just an example.)

How do I combine that with warning options to disable warnings from only the minibuffer? (For example, the minibuffer doesn't need to tell me that I've hit the end of the buffer or that the M-x: prompt string is read-only.)

I tried describe-variable with warning-minimum-level and there was no such variable defined.

Answer 1

This is very similar to the question Is there a way to disable the “buffer is read-only” warning?, so a very similar answer seems appropriate.

You can disable these messages by setting command-error-function to a function that ignores signals buffer-read-only, beginning-of-buffer, and end-of-buffer.

(defun my-command-error-function (data context caller)
  "Ignore the buffer-read-only, beginning-of-buffer,
end-of-buffer signals; pass the rest to the default handler."
  (when (not (memq (car data) '(buffer-read-only
                                beginning-of-buffer
                                end-of-buffer)))
    (command-error-default-function data context caller)))

(setq command-error-function #'my-command-error-function)

(Tested using GNU Emacs 24.5.1.)

Answer 2

You want to look at the functions that use line-move-visual / line-move-1 / line-move -- within the library simple.el. The error message occurs because the optional argument of noerror is not being used to suppress the error message.

However, some functions depend upon that signal error to halt an ongoing function -- e.g., the third-party optional library multiple-cursors depends upon that signal error to prevent a never ending loop.