Re: find-function-source-directory

[Eli Zaretskii <eliz@gnu.org>]

> From: Richard Copley <rcopley@gmail.com>
> Date: Sun, 18 Feb 2018 16:16:03 +0000
> 
> I want 'find-function' to go to the .el files in my build directory
> "c:/projects/emacs/", not the installed .el.gz files
> in "c:/msys64/mingw64/share/emacs/27.0.50/". The docstring for
> 'find-function' suggests it's possible (but doesn't give an example):
> 
>     The library where FUNCTION is defined is searched for in
>     ‘find-function-source-path’, if non-nil, otherwise in ‘load-path’.
> 
> I tried each of these in my init file, with no effect:
> 
> (setq find-function-source-path "c:/projects/emacs/")
> (setq find-function-source-path "c:/projects/emacs/lisp/")
> (setq find-function-source-path
>       (mapcar
>        (lambda (x)
>          (if (string-match "\\`c:/msys64/mingw64/share/emacs/27.0.50/" x)
>              (replace-match "c:/projects/emacs/" nil nil x)
>            x))
>        load-path))
> 
> Did I miss something?

Anything that is called "path" should be a list of directories, nopt a
single file name (this is GNU, remember?).  So try something like
this:

  (setq find-function-source-path
    '("c:/projects/emacs/lisp/"
      "c:/projects/emacs/lisp/emacs-lisp/"
      "c:/projects/emacs/lisp/net/"
      ...))

(add more subdirectories instead of the ellipsis).