GNU bug report logs - #3418
Issue with compile.el and compilation-parse-errors-filename-function

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Message #23 received at 3418 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: Gary Oberbrunner <garyo <at> genarts.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 3418 <at> debbugs.gnu.org,
 Andrew Hyatt <ahyatt <at> gmail.com>
Subject: Re: bug#3418: Issue with compile.el and
 compilation-parse-errors-filename-function
Date: Thu, 10 Aug 2017 20:50:29 -0400

Gary Oberbrunner <garyo <at> genarts.com> writes:

> If a user (such as myself) has an implementation of this function in his .emacs today, like so:
>
> (defun process-error-filename (filename)
>   ;;; do stuff with filename
>   filename)
> (setq compilation-parse-errors-filename-function 'process-error-filename)
>
> and we add a new argument that gets passed to that function, it'll throw an error. *Users* will have to add 
>   &optional spec-dir 
> to their implementations of it to avoid the error.

We could do something like

    (condition-case err
        (funcall compilation-parse-errors-filename-function filename spec-dir)
      (wrong-number-of-arguments
       ;; Try again with single arg for backwards compatibility.
       (funcall compilation-parse-errors-filename-function filename)))

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