IMP: emacs

Use spaces instead of tabs to indent

(setq-default indent-tabs-mode nil)

Make emacs turn all characters beyond 80 red.

(add-hook 'c++-mode-hook
        '(lambda () (font-lock-set-up-width-warning 80)))
(add-hook 'python-mode-hook
        '(lambda () (font-lock-set-up-width-warning 80)))



(defun font-lock-width-keyword (width)
 `((,(format "^%s\\(.+\\)" (make-string width ?.))
    (1 font-lock-warning-face t))))

(font-lock-add-keywords 'c++-mode (font-lock-width-keyword 80))
(font-lock-add-keywords 'python-mode (font-lock-width-keyword 80)) 

Make it so that trailing white space is removed on saves.

(add-hook 'write-file-hooks 'delete-trailing-whitespace)

(defun delete-trailing-blank-lines ()
     "Deletes all blank lines at the end of the file."
     (interactive)
     (save-excursion
       (save-restriction
         (widen)
         (goto-char (point-max))
         (delete-blank-lines))))

(add-hook 'write-file-hooks 'delete-trailing-blank-lines)