values of buffer-local variables lost after dired-do-rename

values of buffer-local variables lost after dired-do-rename

[Roland Winkler]

The following appears strange to me: 

Suppose I've visited a file in emacs, then I rename that file by
means of dired-do-rename. Afterwards all the values of buffer-local
variables are replaced by the corresponding global values. Why don't
they keep their buffer-local values (at least for file-local
variables)??

Is there a simple way for re-evaluating the values of file-local
variables without reloading the file? (After reloading I loose, for
example, the buffer-undo-list.)

Roland

PS/ I am using GNU Emacs 21.2.1 (i386-pc-linux-gnu, X toolkit, Xaw3d
scroll bars)

Re: values of buffer-local variables lost after dired-do-rename

[Gareth Rees]

Roland Winkler <Roland.Winkler@physik.uni-erlangen.de> wrote:   
> Suppose I've visited a file in emacs, then I rename that file by means   
> of dired-do-rename. Afterwards all the values of buffer-local   
> variables are replaced by the corresponding global values. Why don't   
> they keep their buffer-local values (at least for file-local   
> variables)?   
   
Because when you change the file name Emacs changes the major mode to   
match the the new file name.  And changing the major mode kills all the   
local variables.   
   
You can stop Emacs changing the major mode when the file name changes by   
setting `change-major-mode-with-file-name' to nil.   
   
Or if you have a particular local variable that you want to preserve,   
you can give it the `permanent-local' property so that   
`kill-all-local-variables'' will ignore it, for example:   
   
    (put 'fill-column 'permanent-local t)  
  
--   
Gareth Rees