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* bug#13837: 24.2; Make it possible to turn whitespace-mode only when there are no existing problems
@ 2013-02-27 21:41 Reuben Thomas
  2013-02-28  2:00 ` bug#13837: Update to code Reuben Thomas
                   ` (3 more replies)
  0 siblings, 4 replies; 30+ messages in thread
From: Reuben Thomas @ 2013-02-27 21:41 UTC (permalink / raw)
  To: 13837

I like global-whitespace-mode, but it has a downside: it keeps
activating in files that have whitespace problems, but which don't
belong to me, so I don't want to fix them. Typically I want to make a
small edit to someone else's code, and they, entirely reasonably, don't
want a big diff.

The following code implements a solution to that, which is to check if
the buffer is whitespace-clean before activating whitespace-mode.

Unfortunately, my current solution is non-optional: it requires
modifying whitespace-turn-on-if-enabled. This could be fixed, for
example by adding a preference.

The other part of the solution is easier to integrate: I've factored out
part of whitespace-report-region into whitespace-test-region, in a way
which is easy to use to implement whitespace-report-region.

If maintainers are interested in adding this feature, I'd be happy to
take guidance on how to modify my code into a patch (currently it just
sits in my .emacs).

;; Make whitespace-turn-on-if-enabled to turn on only if no
;; whitespace problems in current buffer.
(require 'whitespace)
(defun whitespace-test-region (start end)
  "Find whether there are whitespace problems in a region.

Return nil if there is no whitespace problem; otherwise, return
non-nil.

A whitespace problem is one of the following:

* If `indent-tabs-mode' is non-nil:
   empty		1. empty lines at beginning of buffer.
   empty		2. empty lines at end of buffer.
   trailing		3. SPACEs or TABs at end of line.
   indentation		4. 8 or more SPACEs at beginning of line.
   space-before-tab	5. SPACEs before TAB.
   space-after-tab	6. 8 or more SPACEs after TAB.

* If `indent-tabs-mode' is nil:
   empty		1. empty lines at beginning of buffer.
   empty		2. empty lines at end of buffer.
   trailing		3. SPACEs or TABs at end of line.
   indentation		4. TABS at beginning of line.
   space-before-tab	5. SPACEs before TAB.
   space-after-tab	6. 8 or more SPACEs after TAB.

See `whitespace-style' for documentation.
See also `whitespace-cleanup' and `whitespace-cleanup-region' for
cleaning up these problems."
  (save-excursion
    (save-match-data                ;FIXME: Why?
      (let* ((has-bogus nil)
             (rstart    (min start end))
             (rend      (max start end))
             (bogus-list
              (mapcar
               #'(lambda (option)
                   (when force
                     (add-to-list 'whitespace-style (car option)))
                   (goto-char rstart)
                   (let ((regexp
                          (cond
                           ((eq (car option) 'indentation)
                            (whitespace-indentation-regexp))
                           ((eq (car option) 'indentation::tab)
                            (whitespace-indentation-regexp 'tab))
                           ((eq (car option) 'indentation::space)
                            (whitespace-indentation-regexp 'space))
                           ((eq (car option) 'space-after-tab)
                            (whitespace-space-after-tab-regexp))
                           ((eq (car option) 'space-after-tab::tab)
                            (whitespace-space-after-tab-regexp 'tab))
                           ((eq (car option) 'space-after-tab::space)
                            (whitespace-space-after-tab-regexp 'space))
                           (t
                            (cdr option)))))
                     (and (re-search-forward regexp rend t)
                          (setq has-bogus t))))
               whitespace-report-list)))
        has-bogus))))

(defun whitespace-turn-on-if-enabled ()
  (when (cond
         ((eq whitespace-global-modes t))
         ((listp whitespace-global-modes)
          (if (eq (car-safe whitespace-global-modes) 'not)
              (not (memq major-mode (cdr whitespace-global-modes)))
            (memq major-mode whitespace-global-modes)))
         (t nil))
    (let (inhibit-quit)
      ;; Don't turn on whitespace mode if...
      (or
       ;; ...we don't have a display (we're running a batch job)
       noninteractive
       ;; ...or if the buffer is invisible (name starts with a space)
       (eq (aref (buffer-name) 0) ?\ )
       ;; ...or if the buffer is temporary (name starts with *)
       (and (eq (aref (buffer-name) 0) ?*)
            ;; except the scratch buffer.
            (not (string= (buffer-name) "*scratch*")))
       ;; Otherwise, turn on whitespace mode.
       (whitespace-find-problems-region (point-min) (point-max))
       (whitespace-turn-on)))))


In GNU Emacs 24.2.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.13)
 of 2012-12-13 on komainu, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11300000
Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.2/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars'
 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
 --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall'
 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: en_GB.UTF-8
  value of $LC_NUMERIC: en_GB.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
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  show-paren-mode: t
  server-mode: t
  savehist-mode: t
  minibuffer-electric-default-mode: t
  iswitchb-mode: t
  icomplete-mode: t
  global-whitespace-mode: t
  global-auto-revert-mode: t
  dtrt-indent-mode: t
  desktop-save-mode: t
  TeX-PDF-mode: t
  TeX-source-correlate-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
SPC SPC C-x C-s C-x k <return> C-x k <return> <down-mouse-1> 
<mouse-1> C-x b <return> C-x b C-s C-a C-] C-] C-] 
C-x b f u n s <return> C-a C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-SPC 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-p C-g C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-n <up> <up> <down> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<left> <left> <left> <left> <left> <left> <left> <M-backspace> 
M a k e C-x C-s C-a C-SPC C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-p M-w M-x r e p o r t - b <backspace> e m a c s - 
b u g <return>

Recent messages:
Saving file /home/rrt/Software/hacked/cw/bar.c...
Wrote /home/rrt/Software/hacked/cw/bar.c
Quit
call-interactively: No recursive edit is in progress [2 times]
Mark set
Quit
Saving file /home/rrt/.emacs.d/funs.el...
Wrote /home/rrt/.emacs.d/funs.el
Mark activated
Saved text from ";; Make whitespace-turn-on-if-enabled to"

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/usr/share/emacs24/site-lisp/auctex/context hides /usr/share/emacs/site-lisp/auctex/context
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magit-autoloads mv-shell-autoloads tumble-autoloads
http-post-simple-autoloads package tabulated-list completing-help
recentf tree-widget wid-edit uniquify paren server savehist
minibuf-eldef iswitchb icomplete whitespace autorevert dtrt-indent
desktop cus-start cus-load ropemacs pymacs warnings url-util url-parse
auth-source eieio byte-opt bytecomp byte-compile cconv macroexp
gnus-util password-cache url-vars mm-util mail-prsvr tex dbus xml
regexp-opt remember user-site-loaddefs advice advice-preload yasnippet
help-fns derived edmacro kmacro easymenu assoc cl muse-autoloads
go-mode-load emacs-goodies-el emacs-goodies-custom
emacs-goodies-loaddefs easy-mmode preview-latex tex-site auto-loads
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-- 
http://rrt.sc3d.org/





^ permalink raw reply	[flat|nested] 30+ messages in thread
end of thread, other threads:[~2014-05-30  2:01 UTC | newest]

Thread overview: 30+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-02-27 21:41 bug#13837: 24.2; Make it possible to turn whitespace-mode only when there are no existing problems Reuben Thomas
2013-02-28  2:00 ` bug#13837: Update to code Reuben Thomas
2013-02-28 16:23 ` bug#13837: 24.2; Make it possible to turn whitespace-mode only when there are no existing problems Stefan Monnier
2013-02-28 16:32   ` Stefan Monnier
2013-03-01 22:02     ` Reuben Thomas
2013-03-02  3:02       ` Stefan Monnier
2013-03-02  7:46         ` Reuben Thomas
2013-03-03 23:36           ` Stefan Monnier
2013-03-01 22:21   ` Reuben Thomas
2013-03-02  3:01     ` Stefan Monnier
2013-03-02  7:49       ` Reuben Thomas
2013-04-10  0:50         ` Reuben Thomas
2013-10-17 23:09           ` Reuben Thomas
2014-01-26 23:12             ` Reuben Thomas
2014-01-26 23:29               ` Dmitry Gutov
2014-01-26 23:31                 ` Reuben Thomas
2014-01-27  0:27                   ` Dmitry Gutov
2014-01-27  0:41                     ` Reuben Thomas
2014-01-27  1:52                       ` Stefan Monnier
2014-01-27 13:25                         ` Reuben Thomas
2014-01-27 15:00                           ` Stefan Monnier
2014-01-27 21:19 ` Reuben Thomas
2014-01-28  0:32   ` Stefan Monnier
2014-01-28  0:48     ` Reuben Thomas
2014-05-29 17:26       ` Stefan Monnier
2014-05-29 19:01         ` Reuben Thomas
2014-05-29 20:28           ` Stefan Monnier
2014-05-29 22:53             ` Reuben Thomas
2014-05-30  2:01               ` Glenn Morris
2014-05-29 19:02 ` Reuben Thomas

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