emacs kernel hacking: rm trailing ws

[Ed L Cashin <ecashin@uga.edu>]

After reading wli on the LKML mention that emacs users leave trailing
whitespace in their files, I added this to my .emacs file.  

It makes sure that when I am working on kernel sources and I save a
buffer, any trailing whitespace is removed.  The rest of it is based
on Linus' advice in Documentation/CodingStyle.


  (require 'cl)
  (defun elc-delete-buffer-trailing-ws ()
    "get rid of trailing whitespace in all lines in current buffer"
    (interactive)
    (message "deleting trailing whitespace!")
    (save-excursion
      (goto-char (point-min))
      (end-of-line)
      (delete-horizontal-space)
      (labels ((rec ()
		 (let ((inhibit-field-text-motion t))
		   (end-of-line 2))
		 (delete-horizontal-space)
		 (if (/= (point) (point-max))
		     (rec))))
	(rec))))

  (defun linux-c-mode ()
    "C mode with adjusted defaults for use with the Linux kernel."
    (interactive)
    (add-hook 'local-write-file-hooks
	      'elc-delete-buffer-trailing-ws)
    (c-mode)
    (c-set-style "K&R")
    (setq c-basic-offset 8))

  (add-to-list 'auto-mode-alist
	       '("/usr/src/linux.*/.*\\.[ch]$" . linux-c-mode))
  (add-to-list 'auto-mode-alist
	       '(".*/kernel/linux-.*/.*\\.[ch]$" . linux-c-mode))


-- 
--Ed L Cashin     PGP public key: http://noserose.net/e/pgp/

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