Re: Need help writing file-visiting macro

["rgb" <rbielaws@i1.net>]

Roy Smith wrote:
> I'm working in a software development system which has classes defined
> in foo.mdl files, with the corresponding implementation code in
> foo_Impl.c files I want to write a macro or function which lets you
> flip back and forth between the two.  If I'm looking at a .mdl file, I
> want it to construct the corresponding _Impl.c filename and visit that
> file.  Is that possible?
>
> I'm using GNU Emacs 21.3.1.

(defun my-open-complementary-file ()
  "If buffer-file-name ends in .h open .mdl and vise versa."
  (interactive)
  (if buffer-file-name
     (if (string-match "\\(\\`.*\\.\\)mdl\\'" (buffer-file-name))
         (find-file (concat (match-string 1 (buffer-file-name))"h"))
       (if (string-match ".*\\.h\\'" (buffer-file-name))
           (find-file (concat (match-string 1
(buffer-file-name))"mdl"))
         (message "Buffer's filename doesn't end in .mdl or .h")))
    (message "Buffer is not visiting a file")))

Don't expect to get this kind of service all the time!