bug#13634: 24.2; trailing whitespace in calendar (enhancement)

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Arun Persaud]

Hi

I like to show trailing white spaces in my buffers using

(setq-default show-trailing-whitespace t)

in my .emacs file. Since I have this enabled, I noticed
that the calendar (M-x calendar) has a lot of empty white space at the
end of the line. It would be nice if those could be removed before
displaying the calendar.

Thanks

Arun

In GNU Emacs 24.2.1 (x86_64-suse-linux-gnu, GTK+ Version 3.4.4)
 of 2012-10-10 on build20
Windowing system distributor `The X.Org Foundation', version 11.0.11203000
Configured using:
 `configure '--with-pop' '--without-hesiod' '--with-kerberos'
 '--with-kerberos5' '--with-xim' '--with-wide-int' '--enable-autodepend'
 '--prefix=/usr' '--mandir=/usr/share/man' '--infodir=/usr/share/info'
 '--datadir=/usr/share' '--localstatedir=/var'
 '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--with-x'
 '--with-sound' '--with-sync-input' '--with-xpm' '--with-jpeg'
 '--with-tiff' '--with-gif' '--with-png' '--with-rsvg' '--with-dbus'
 '--without-gpm' '--with-x-toolkit=gtk3' '--x-includes=/usr/include'
 '--x-libraries=/usr/lib64:/usr/share/X11' '--with-xft' '--with-libotf'
 '--with-m17n-flt' '--build=x86_64-suse-linux'
 'build_alias=x86_64-suse-linux' 'CFLAGS=-fmessage-length=0 -O2 -Wall
 -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables
 -fasynchronous-unwind-tables -g -D_GNU_SOURCE -std=gnu89 -pipe
 -Wno-pointer-sign -Wno-unused-variable -Wno-unused-label
 -Wno-unprototyped-calls -fno-optimize-sibling-calls
 -DSYSTEM_PURESIZE_EXTRA=55000 -DSITELOAD_PURESIZE_EXTRA=10000 '
 'LDFLAGS=-Wl,-O2 -Wl,--hash-size=65521''

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: nil
  value of $LC_NUMERIC: POSIX
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  shell-dirtrack-mode: t
  ido-everywhere: t
  global-smart-tab-mode: t
  smart-tab-mode: t
  yas/global-mode: t
  show-paren-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
  line-number-mode: t
  transient-mark-mode: t

Recent input:

Recent messages:
(No files need saving)
Saving all Org-mode buffers... done
Reverted 1 buffer.
Saving all Org-mode buffers...
(No files need saving)
Saving all Org-mode buffers... done
Reverted 1 buffer.
Symbolic link to Git-controlled source file; follow link? (y or n)  y
Followed link to /home/arun/mydotfiles/emacs
Mark saved where search started
Quit

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bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Bastien]

Hi Arun,

Arun Persaud <apersaud@lbl.gov> writes:

> I like to show trailing white spaces in my buffers using
>
> (setq-default show-trailing-whitespace t)
>
> in my .emacs file. Since I have this enabled, I noticed
> that the calendar (M-x calendar) has a lot of empty white space at the
> end of the line. It would be nice if those could be removed before
> displaying the calendar.

Can you make a patch for this?  It should be small enough so that we
can apply it quickly.

Thanks,

-- 
 Bastien

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Glenn Morris]

Bastien wrote:

>> that the calendar (M-x calendar) has a lot of empty white space at the
>> end of the line. It would be nice if those could be removed before
>> displaying the calendar.
>
> Can you make a patch for this?  It should be small enough so that we
> can apply it quickly.

I don't see the point.
Don't enable whitespace-mode if you don't like seeing it.

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Bastien]

Glenn Morris <rgm@gnu.org> writes:

> Bastien wrote:
>
>>> that the calendar (M-x calendar) has a lot of empty white space at the
>>> end of the line. It would be nice if those could be removed before
>>> displaying the calendar.
>>
>> Can you make a patch for this?  It should be small enough so that we
>> can apply it quickly.
>
> I don't see the point.
> Don't enable whitespace-mode if you don't like seeing it.

FWIW The OP did not enable whitespace-mode, he set
`show-trailing-whitespace' globally to t.

If the patch removes the whitespaces in calendar, there is
no point in refusing it.

-- 
 Bastien

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Drew Adams]

> > I don't see the point.
> > Don't enable whitespace-mode if you don't like seeing it.
> 
> FWIW The OP did not enable whitespace-mode, he set
> `show-trailing-whitespace' globally to t.
> 
> If the patch removes the whitespaces in calendar, there is
> no point in refusing it.

+1

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Glenn Morris]

Bastien wrote:

> `show-trailing-whitespace' globally to t.

So don't do that then. Set it locally in find-file-hook, or unset it in
a calendar hook.

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Date: Wed, 06 Feb 2013 13:03:36 -0500
> Cc: 13634@debbugs.gnu.org, Arun Persaud <apersaud@lbl.gov>
> 
> Bastien wrote:
> 
> > `show-trailing-whitespace' globally to t.
> 
> So don't do that then. Set it locally in find-file-hook, or unset it in
> a calendar hook.

I agree.  Using show-trailing-whitespace in calendar doesn't make
sense, since the buffer text there is generated by a program.

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Arun Persaud]

[-- Attachment #1: Type: text/plain, Size: 1161 bytes --]

On 02/06/2013 08:41 AM, Bastien wrote:
> Hi Arun,
> 
> Arun Persaud <apersaud@lbl.gov> writes:
> 
>> I like to show trailing white spaces in my buffers using
>>
>> (setq-default show-trailing-whitespace t)
>>
>> in my .emacs file. Since I have this enabled, I noticed
>> that the calendar (M-x calendar) has a lot of empty white space at the
>> end of the line. It would be nice if those could be removed before
>> displaying the calendar.
> 
> Can you make a patch for this?  It should be small enough so that we
> can apply it quickly.
> 
> Thanks,
> 

Here is a simple patch that seems to run on my computer, but I never
really looked at the calendar code before, so I'm not sure if this is
the right way of doing this.

The patch calls delete-trailing-whitespace for the current line when
advancing a line (via calendar-ensure-newline) and also removes the
whitespace for the last line when inserting a month into the buffer.
Removing the trailing whitespace doesn't seem to mess up the formatting,
since calendar-insert-at-column seems to be used when adding text which
fills the line with spaces in case it's needed before adding the text.

cheers
	
Arun

[-- Attachment #2: remove-trailing-whitespace-in-calendar.diff --]
[-- Type: text/x-patch, Size: 846 bytes --]

--- calendar.el	2013-02-06 10:28:54.679401343 -0800
+++ calendar.el.new	2013-02-06 10:28:25.738455568 -0800
@@ -1417,6 +1417,7 @@
 
 (defun calendar-ensure-newline ()
   "Move to the next line, adding a newline if necessary."
+  (delete-trailing-whitespace  (line-beginning-position) (line-end-position) )
   (or (zerop (forward-line 1))
       (insert "\n")))
 
@@ -1499,7 +1500,8 @@
                 (/= day last))
        (calendar-ensure-newline)
        (setq day (1+ day))              ; first day of next week
-       (calendar-insert-at-column indent calendar-intermonth-text trunc)))))
+       (calendar-insert-at-column indent calendar-intermonth-text trunc)))
+   (delete-trailing-whitespace  (line-beginning-position) (line-end-position))))
 
 (defun calendar-redraw ()
   "Redraw the calendar display, if `calendar-buffer' is live."

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Bastien]

Glenn Morris <rgm@gnu.org> writes:

> Bastien wrote:
>
>> `show-trailing-whitespace' globally to t.
>
> So don't do that then. 

I'm not doing anything.

-- 
 Bastien

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Arun Persaud]

On 02/06/2013 10:38 AM, Eli Zaretskii wrote:
>> From: Glenn Morris <rgm@gnu.org>
>> Date: Wed, 06 Feb 2013 13:03:36 -0500
>> Cc: 13634@debbugs.gnu.org, Arun Persaud <apersaud@lbl.gov>
>>
>> Bastien wrote:
>>
>>> `show-trailing-whitespace' globally to t.
>>
>> So don't do that then. Set it locally in find-file-hook, or unset it in
>> a calendar hook.
> 
> I agree.  Using show-trailing-whitespace in calendar doesn't make
> sense, since the buffer text there is generated by a program.

I agree that it doesn't make sense in principle, but it's also annoying
to have to add special hooks for special buffers and since the calendar
is generated, why not fix it there?

For all files that I use in emacs setting show-trailing-whitespace
globally makes sense (but that might just be me). The only buffer that
shows extra white space in my setting is the calendar, so I thought I
bring it up.

Arun

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Drew Adams]

> > > `show-trailing-whitespace' globally to t.
> > 
> > So don't do that then. Set it locally in find-file-hook, or 
> > unset it in a calendar hook.
> 
> I agree.  Using show-trailing-whitespace in calendar doesn't make
> sense, since the buffer text there is generated by a program.

It doesn't make sense either for the code to add trailing whitespace here in the
first place.  The fact that it is generated by a program is no good reason to
keep it.  People are responsible for programs.

And if for some reason the code must add it temporarily, it still doesn't make
sense for the code not to then remove it before displaying.

Trailing whitespace serves no purpose here for anyone, does it?

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Drew Adams]

> >>> `show-trailing-whitespace' globally to t.
> >>
> >> So don't do that then. Set it locally in find-file-hook, 
> >> or unset it in a calendar hook.
> > 
> > I agree.  Using show-trailing-whitespace in calendar doesn't make
> > sense, since the buffer text there is generated by a program.
> 
> I agree that it doesn't make sense in principle, but it's 
> also annoying to have to add special hooks for special buffers
> and since the calendar is generated, why not fix it there?

Thank you.  That's the point.  Why inconvenience users unnecessarily?

Not adding (or removing if added) trailing whitespace is the kind of thing that
computers are good at.  And the kind of thing that users should not be bothered
with.

Pretty amazing that two of the main Emacs developers take the attitude that this
should be an individual user problem, not just a problem that the code should
simply obviate.

> For all files that I use in emacs setting show-trailing-whitespace
> globally makes sense (but that might just be me). The only buffer that
> shows extra white space in my setting is the calendar, so I thought I
> bring it up.

You did the right thing.  Too bad if your request falls on deaf ears.

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Stefan Monnier]

> If the patch removes the whitespaces in calendar, there is
> no point in refusing it.

It's a minor issue, so it's only OK to accept it if the change is very
straightforward (and if there isn't much risk that some user will then
complain that his background face highlighting suddenly becomes jagged).


        Stefan

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Drew Adams]

> It's a minor issue, so it's only OK to accept it if the change is very
> straightforward (and if there isn't much risk that some user will then
> complain that his background face highlighting suddenly 
> becomes jagged).

The parenthetical remark is a good point, a priori.
Is that really the effect?

bug#13634: 24.2; trailing whitespace in calendar (enhancement)

[Drew Adams]

> > (and if there isn't much risk that some user will then
> > complain that his background face highlighting suddenly 
> > becomes jagged).
> 
> The parenthetical remark is a good point, a priori.
> Is that really the effect?

A quick check from emacs -Q indicates that even without the removal of trailing
whitespace the rightmost column is not constant, i.e., there is no right-padding
with whitespace to the rightmost calendar column.

The month name seems to be padded, but one eolumn less than what full weeks are
padded.  And both a partial week and a full week are followed by only one space
(i.e., no padding here to the rightmost column either).

So any potential jagged background problem would seem to be present with or
without trailing whitespace removal.