GNU bug report logs - #32562
26; `read-char(-exclusive)' and `characterp'

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Magnar Sveen <magnars <at> gmail.com>
Subject: bug#13599: closed (Re: bug#32562: 26; `read-char(-exclusive)' and
 `characterp')
Date: Mon, 10 Sep 2018 10:02:03 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#32562: 24.2; (max-char) is too low (and hard to change)

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 13599 <at> debbugs.gnu.org.

-- 
32562: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=32562
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: npostavs <at> gmail.com, 32562-done <at> debbugs.gnu.org
Subject: Re: bug#32562: 26; `read-char(-exclusive)' and `characterp'
Date: Mon, 10 Sep 2018 13:01:11 +0300

> Date: Tue, 28 Aug 2018 14:24:36 -0700 (PDT)
> From: Drew Adams <drew.adams <at> oracle.com>
> Cc: 32562 <at> debbugs.gnu.org
> 
> is `read-char' necessarily about chars that satisfy `characterp'?

No.  It returns a character event, not a character.

> The doc string of `text-char-description' says "file-character CHARACTER". What's a "file character"? A character that can appear in a file name?

No, text-char-description accepts only valid character codes, those
which satisfy the 'characterp' test.  This is unlike
single-key-description, which accepts _events_, and thus will happily
process character input events that are not valid character codes,
i.e. fail the 'characterp' test.  I've now made that clear in the
respective doc strings.

> This stuff is not clear more generally, I think - beyond the max value of `max-char'. Do we have or want to have different kinds of "characters" returned from or passed as args to different "character" functions? Why (or why not)?

The basic difference is between a character code and a character input
event.

> Wrt my original problem: taking a value of `M-:' from `read-char' and passing it to `text-char-description', Emacs has a regression of sorts. Older Emacs versions "work", whereas recent versions raise an error. E.g. Emacs 20 `read-char' returns -134217670, and passing that to `text-char-description' gives "\272". Whatever `read-char' can read, it seems, `text-char-description' can describe (perhaps imperfectly?).

It's not a regression: text-char-description wants a valid character
code.

I'm closing this bug, as I think this is a documentation issue which
is now fixed.

Thanks.

[Message part 3 (message/rfc822, inline)]

From: Magnar Sveen <magnars <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2; (max-char) is too low (and hard to change)
Date: Thu, 31 Jan 2013 19:42:27 +0100

Due to my weird norwegian keyboard, I'm trying to map my s-8 to [.

Doing a M-: (read-char) s-8 gives me the key value of 8388664.

Following that up with (keyboard-translate 8388664 ?\[) does not work,
since it fails the (characterp) test. Turns out that (max-char) is a C
function that returns the highest allowed keycode. On my Emacs, that
is 4194303.

Since (max-char) is a function and not a variable, and a C function at
that (not advisable when called from another C function (characterp)) -
I am left without options to rectify it. Or maybe I could use a hex
editor. :-)

So, is this a bug? Is it weird that max-char is a function? In C? Ought
4194303 chars be enough for anybody? That's up to you guys to decide.

Kind regards,
Magnar Sveen


In GNU Emacs 24.2.1 (x86_64-apple-darwin10.8.0, NS apple-appkit-1038.36)
 of 2012-09-04 on fi-bp-202.local
Windowing system distributor `Apple', version 10.3.1038
Configured using:
 `configure '--prefix=/usr/local/Cellar/emacs/24.2' '--without-dbus'
 '--enable-locallisppath=/usr/local/share/emacs/site-lisp'
 '--infodir=/usr/local/Cellar/emacs/24.2/share/info/emacs' '--with-ns'
 '--disable-ns-self-contained' 'CC=/usr/bin/gcc-4.2' 'CFLAGS=-Os -w
 -pipe -march=core2 -msse4 -mmacosx-version-min=10.6'
 'LDFLAGS=-L/usr/local/lib''

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: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8
  default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  elisp-slime-nav-mode: t
  hardcore-mode: t
  show-paren-mode: t
  global-hl-line-mode: t
  ido-ubiquitous-mode: t
  eproject-mode: t
  paredit-mode: t
  persp-mode: t
  yas/global-mode: t
  yas/minor-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  global-subword-mode: t
  subword-mode: t
  recentf-mode: t
  delete-selection-mode: t
  global-auto-revert-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-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:
c s-8 <down-mouse-1> <mouse-1> C-y C-x C-e s-8 C-_ 
C-a M-f - u n C-d C-e C-b C-w C-_ <backspace> <backspace> 
<backspace> <backspace> C-e C-x C-e s-8 s-8 C-_ C-_ 
C-_ C-_ C-_ C-e C-x C-e s-8 C-q s-8 C-_ C-_ M-_ M-_ 
M-_ M-_ C-d C-d C-d C-b <backspace> <backspace> <backspace> 
<backspace> C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b 
C-b C-b C-b C-b C-b C-b C-b C-b C-b C-u C-n C-p C-p 
C-p C-p u n C-e C-x C-e C-a C-k C-b C-x C-e q s-8 s-8 
C-q s-8 <f1> f r e a d - c h a r <return> M-: ( r e 
a d - c h a r ) <return> s-8 <f1> k C-q <S-right> <tab> 
<return> 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-q s-8 M-: <up> <return> s-8 
C-n C-n C-n C-n C-n C-x b <return> C-x C-e <S-right> 
q M-: <up> <return> s-8 C-x C-e <S-left> <S-right> 
<tab> <tab> <return> <S-right> <up> <up> <return> C-n 
C-n C-n C-n <f1> f c h a r a c t e r p <return> <S-right> 
M-: ( m a x - x h a r <backspace> <backspace> <backspace> 
<backspace> c h a r ) <return> M-: <up> C-g <f1> f 
m a x - c h a r <return> <S-right> <tab> <return> C-g 
q <f1> f c h a r a c t e r p <return> <S-right> <tab> 
C-n C-n C-n C-n C-a M-w <S-tab> <return> C-g q M-x 
e m a c s - r e b <backspace> p o <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> r e p o r t <r
eturn>

Recent messages:
4194303 (#o17777777, #x3fffff)
Quit

windmove-do-window-select: No window right from selected window
mouse-2, RET: find function's definition
Quit
Type "q" in help window to restore its previous buffer.
mouse-2, RET: find function's definition
Copied to end of line
mouse-2, RET: find function's definition
Quit

Load-path shadows:
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~/.emacs.d/users/fimasvee/init hides ~/.emacs.d/init
/Users/fimasvee/.emacs.d/elpa/magit-20130109.2027/rebase-mode hides /usr/local/share/emacs/site-lisp/rebase-mode
/Users/fimasvee/.emacs.d/site-lisp/delsel/delsel hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/delsel
~/.emacs.d/custom hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/custom
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/usr/local/share/emacs/site-lisp/tramp hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/net/tramp
/usr/local/share/emacs/site-lisp/tramp-uu hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/net/tramp-uu
/usr/local/share/emacs/site-lisp/tramp-smb hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/net/tramp-smb
/usr/local/share/emacs/site-lisp/tramp-sh hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/net/tramp-sh
/usr/local/share/emacs/site-lisp/tramp-loaddefs hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/net/tramp-loaddefs
/usr/local/share/emacs/site-lisp/tramp-gw hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/net/tramp-gw
/usr/local/share/emacs/site-lisp/tramp-ftp hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/net/tramp-ftp
/usr/local/share/emacs/site-lisp/tramp-compat hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/net/tramp-compat
/usr/local/share/emacs/site-lisp/tramp-cmds hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/net/tramp-cmds
/usr/local/share/emacs/site-lisp/tramp-cache hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/net/tramp-cache
/Users/fimasvee/.emacs.d/elpa/magit-20130109.2027/.dir-locals hides /usr/local/Cellar/emacs/24.2/share/emacs/24.2/lisp/gnus/.dir-locals

Features:
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sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process ns multi-tty
emacs)

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