bug#24745: 25.1.50; whitespace.el: fix beginning/end of buffer checks

[Reuben Thomas]

Tags: patch


whitespace-report-region currently (Emacs 25.1, and identically in
master) fails correctly to detect whitespace at the start and end of the
buffer. This is because the relevant regexps,
whitespace-empty-at-{bob,eob}-regexp, are not anchored to the start and
end of the buffer. Hence, whitespace-report-region finds spurious
matches (for example, diagnosing blank lines at the end of the buffer
whenever there is space at the start of any line).

This behavior is intentional: for highlighting and cleanup purposes,
these regexps are applied explicitly to the start and end of the buffer,
and so both highlighting and cleanup work correctly.

However, I suggest that the intention is wrong: the variables’ names and
documentation refer to the start and end of the buffer, not of the
current region; and further, whitespace at the start or end of a region
is not usually considered a problem.

The fix, therefore, is simple: anchor the default value of the patterns
to the start and end of the buffer respectively. This fixes the bug in
whitespace-report-region when used on the whole buffer, while also
making the behavior for non-whole-buffer regions be what one might
expect: empty lines are only diagnosed if the region includes the start
or end of the buffer.

I attach a patch with this fix.

If the maintainers disagree with my analysis; specifically, if you think
that the empty checks should work at the start and end of the region,
then the fix will be a little more complex, as whitespace-report-region
will have to treat those checks specially, as other parts of the code
do.



In GNU Emacs 25.1.50.9 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2016-10-15 built on skwd
Repository revision: 4eb4463abf1db904f9e8cdc35156a66f8a10125c
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:     Ubuntu 16.04.1 LTS

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: en_GB.utf8
  value of $LC_NUMERIC: en_GB.utf8
  value of $LC_TIME: en_GB.utf8
  value of $LANG: en_GB.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix

Major mode: Text

Minor modes in effect:
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  buffer-face-mode: t
  flyspell-mode: t
  goto-address-mode: t
  smart-quotes-mode: t
  show-paren-mode: t
  savehist-mode: t
  recentf-mode: t
  minibuffer-electric-default-mode: t
  global-auto-revert-mode: t
  electric-pair-mode: t
  desktop-save-mode: t
  global-whitespace-mode: t
  diff-auto-refine-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  helm-mode: t
  shell-dirtrack-mode: t
  helm-autoresize-mode: t
  async-bytecomp-package-mode: t
  dtrt-indent-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-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 messages:
Type C-c C-c to finish, or C-c C-k to cancel
Quit [5 times]
Mark set [2 times]
previous-line: Beginning of buffer [5 times]
Mark activated
Auto-saving...done
Saving file /home/rrt/.local/var/repo/emacs/.git/COMMIT_EDITMSG...
Wrote 
/home/rrt/.emacs.d/undo-tree/.!home!rrt!.local!var!repo!emacs!.git!COMMIT_EDITMSG.~undo-tree~
Wrote /home/rrt/.local/var/repo/emacs/.git/COMMIT_EDITMSG
Git finished [2 times]

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sgml-mode jka-compr flymake paredit server ox-odt rng-loc rng-uri
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org-macs org-loaddefs find-func cal-menu calendar cal-loaddefs go-mode
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ezimage dframe whitespace bug-reference-github bug-reference vc-git
diff-mode undo-tree diff helm-mode helm-files rx image-dired tramp
tramp-compat tramp-loaddefs trampver ucs-normalize shell pcomplete
format-spec dired-x dired-aux ffap thingatpt helm-buffers helm-elscreen
helm-tags helm-bookmark helm-adaptive helm-info bookmark helm-locate
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url-domsuf url-util url-parse auth-source gnus-util mm-util help-fns
mail-prsvr password-cache url-vars mailcap helm-utils compile comint
ansi-color ring helm-help helm-types helm derived helm-source
eieio-compat helm-multi-match easy-mmode helm-lib helm-config
helm-easymenu async-bytecomp async locate finder-inf tex-site
go-mode-autoloads info edmacro kmacro windows revive init-paredit
dtrt-indent csv init-eldoc eldoc-extension advice .loaddefs eieio
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el-get-dependencies el-get-build el-get-status pp el-get-methods
el-get-fossil el-get-svn el-get-pacman el-get-github-zip
el-get-github-tar el-get-http-zip el-get-http-tar el-get-hg el-get-go
el-get-git-svn el-get-fink el-get-emacswiki el-get-http el-get-notify
el-get-emacsmirror el-get-github el-get-git el-get-elpa package
epg-config seq byte-opt el-get-darcs el-get-cvs el-get-bzr el-get-brew
el-get-builtin el-get-apt-get el-get-recipes el-get-byte-compile
el-get-custom cl-seq el-get-core autoload lisp-mnt bytecomp byte-compile
cl-extra help-mode easymenu cconv cl gv cl-loaddefs pcase cl-lib dired
debian-el debian-el-loaddefs org-install dpkg-dev-el
dpkg-dev-el-loaddefs devhelp user-site-loaddefs time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register
page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote dbusbind inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 900071 66624)
 (symbols 48 50698 0)
 (miscs 40 944 1231)
 (strings 32 197868 33051)
 (string-bytes 1 6425863)
 (vectors 16 76424)
 (vector-slots 8 1943239 128378)
 (floats 8 617 583)
 (intervals 56 19804 193)
 (buffers 976 55)
 (heap 1024 75902 7551))

-- 
http://rrt.sc3d.org/

===File 
/home/rrt/.local/var/repo/emacs/0001-whitespace-fix-bob-eob-checks.patch===
>From 0f0219bff7f1e365e8575e2e61983c0926cf787d Mon Sep 17 00:00:00 2001
From: Reuben Thomas <rrt@sc3d.org>
Date: Thu, 20 Oct 2016 13:17:58 +0100
Subject: [PATCH] whitespace: fix bob/eob checks

* whitespace.el: make `empty' checks work at beginning & end of buffer
in whitespace-report-region, and only there (i.e. they will never match
in regions that don't include the start or end of the buffer).
---
 lisp/whitespace.el | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lisp/whitespace.el b/lisp/whitespace.el
index 0f6b8df..f790ac5 100644
--- a/lisp/whitespace.el
+++ b/lisp/whitespace.el
@@ -828,7 +828,7 @@ whitespace-indentation-regexp
   :group 'whitespace)
 
 
-(defcustom whitespace-empty-at-bob-regexp "^\\(\\([ \t]*\n\\)+\\)"
+(defcustom whitespace-empty-at-bob-regexp "\\`\\(\\([ \t]*\n\\)+\\)"
   "Specify regexp for empty lines at beginning of buffer.
 
 Used when `whitespace-style' includes `empty'."
@@ -836,7 +836,7 @@ whitespace-empty-at-bob-regexp
   :group 'whitespace)
 
 
-(defcustom whitespace-empty-at-eob-regexp "^\\([ \t\n]+\\)"
+(defcustom whitespace-empty-at-eob-regexp "^\\([ \t\n]+\\)\\'"
   "Specify regexp for empty lines at end of buffer.
 
 Used when `whitespace-style' includes `empty'."
@@ -1515,7 +1515,7 @@ whitespace-cleanup
            (when (looking-at whitespace-empty-at-bob-regexp)
              (delete-region (match-beginning 1) (match-end 1)))
            (when (re-search-forward
-                  (concat whitespace-empty-at-eob-regexp "\\'") nil t)
+                   whitespace-empty-at-eob-regexp nil t)
              (delete-region (match-beginning 1) (match-end 1)))))))
     ;; PROBLEM 3: 8 or more SPACEs at bol
     ;; PROBLEM 4: SPACEs before TAB
-- 
2.7.4

============================================================