Jun 9

Betrand Mathieus blog article on cleaning up trailing whitespace comes in handy for me as I’ve frequently run into problems with the Python test coverage tool stumbling over trailing whitespace. It also reminded me of an emacs snippet I recently installed to detect a mix of space and tabs in my Python buffers — I do set (setq indent-tabs-mode nil) in my .emacs for python-mode, however, I still occasionally somehow manage to insert some tabs in my source buffers. So I came up with the following snippet which validates that a buffer in python-mode doesn’t contain any tabs. It’s hooked up with the very general write-file-hook, but there is no python-specific hook on saving buffers. In case the buffer does contain any tab, it will leave the point (the place where your cursor will be) at the fount tab.


; code snippet GUID 32F94179-A86B-4780-8645-8A526BD8533A
(defun no-tab-validation (buffer)
  (interactive "bValidate buffer:")
  (save-excursion
    (unless (equal (buffer-name (current-buffer)) buffer)
      (switch-to-buffer buffer))
    (if (re-search-forward "\t" nil t)
    (error "Buffer %s contains tabs" buffer))))

(defun py-tab-validate-on-save-hook ()
  (when (equal mode-name "Python")
    (no-tab-validation (buffer-name (current-buffer)))))

(add-hook 'write-file-hook 'py-tab-validate-on-save-hook)

;;; inhibit tabs in some modes
(defun set-indent-tabs-mode (value)
  "Set indent-tabs-mode to value."
  (setq indent-tabs-mode value))

(defun toggle-tabs ()
  "Toggle `indent-tabs-mode'."
  (interactive)
  (set-indent-tabs-mode
   (not indent-tabs-mode)))

(defun disable-tabs-mode ()
  (set-indent-tabs-mode nil))

(add-hook 'sgml-mode-hook 'disable-tabs-mode)
(add-hook 'xml-mode-hook 'disable-tabs-mode)
(add-hook 'python-mode 'disable-tabs-mode)

Posted by Holger Schauer

Defined tags for this entry: ,

0 Trackbacks

  1. No Trackbacks

0 Comments

Display comments as(Linear | Threaded)
  1. No comments

Add Comment


Markdown format allowed
Enclosing asterisks marks text as bold (*word*), underscore are made via _word_.
E-Mail addresses will not be displayed and will only be used for E-Mail notifications.

To prevent automated Bots from commentspamming, please enter the string you see in the image below in the appropriate input box. Your comment will only be submitted if the strings match. Please ensure that your browser supports and accepts cookies, or your comment cannot be verified correctly.
CAPTCHA