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[debbugs-tracker] bug#13599: closed (24.2; (max-char) is too low (and ha

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#13599: closed (24.2; (max-char) is too low (and hard to change))
Date: Mon, 10 Sep 2018 10:02:03 +0000

Your message dated Mon, 10 Sep 2018 13:01:11 +0300
with message-id <address@hidden>
and subject line Re: bug#32562: 26; `read-char(-exclusive)' and `characterp'
has caused the debbugs.gnu.org bug report #32562,
regarding 24.2; (max-char) is too low (and hard to change)
to be marked as done.

(If you believe you have received this mail in error, please contact

32562: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=32562
GNU Bug Tracking System
Contact address@hidden with problems
--- Begin Message --- 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'
 '--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'

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

Recent messages:
4194303 (#o17777777, #x3fffff)

windmove-do-window-select: No window right from selected window
mouse-2, RET: find function's definition
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

Load-path shadows:
/Users/fimasvee/.emacs.d/elpa/hardcore-mode-1.0.0/hardcore-mode hides 
hides /Users/fimasvee/.emacs.d/site-lisp/fill-column-indicator
~/.emacs.d/users/fimasvee/init hides ~/.emacs.d/init
/Users/fimasvee/.emacs.d/elpa/magit-20130109.2027/rebase-mode hides 
/Users/fimasvee/.emacs.d/site-lisp/delsel/delsel hides 
~/.emacs.d/custom hides 
/usr/local/share/emacs/site-lisp/trampver hides 
/usr/local/share/emacs/site-lisp/tramp hides 
/usr/local/share/emacs/site-lisp/tramp-uu hides 
/usr/local/share/emacs/site-lisp/tramp-smb hides 
/usr/local/share/emacs/site-lisp/tramp-sh hides 
/usr/local/share/emacs/site-lisp/tramp-loaddefs hides 
/usr/local/share/emacs/site-lisp/tramp-gw hides 
/usr/local/share/emacs/site-lisp/tramp-ftp hides 
/usr/local/share/emacs/site-lisp/tramp-compat hides 
/usr/local/share/emacs/site-lisp/tramp-cmds hides 
/usr/local/share/emacs/site-lisp/tramp-cache hides 
/Users/fimasvee/.emacs.d/elpa/magit-20130109.2027/.dir-locals hides 

(shadow sort mail-extr emacsbug debug dired-aux git-commit-mode rx
php-mode flymake cc-langs setup-magit magit-svn magit-bisect
magit-key-mode magit diff-mode log-edit pcvs-util add-log mule-util
zencoding-mode rename-sgml-tag crappy-jsp-mode js-mode-expansions js
json cc-mode-expansions cc-mode cc-fonts cc-guess cc-menus cc-cmds
cc-styles cc-align cc-engine cc-vars cc-defs jsp-expansions
html-mode-expansions tagedit sgml-mode hippie-exp css-mode-expansions
css-mode misearch multi-isearch tabify conf-mode newcomment org-wl
org-w3m org-vm org-rmail org-mhe org-mew org-irc org-jsinfo org-infojs
org-html org-exp ob-exp org-exp-blocks find-func org-agenda org-info
org-gnus org-docview org-bibtex bibtex org-bbdb network-stream starttls
tls vc-git adventur-mode alternatives-mode adv-refill refill
adv-indentation adv-keybindings adv-defuns adv-refactorings
adv-new-number adv-named-rooms adv-search adv-enter adv-tab adv-escape
adv-dash adv-jump-candidate adv-syntax-highlighting adv-intelli nrepl
arc-mode archive-mode setup-clojure-mode clj-refactor
clojure-mode-expansions clojure-mode inf-lisp tramp tramp-compat
tramp-loaddefs setup-shell shell-command shell adv-utils adv-regexes
regex-dsl unsafep elisp-slime-nav etags oppdrag-mode my-defuns
hardcore-mode server setup-mu4e mu4e mu4e-speedbar speedbar sb-image
ezimage dframe mu4e-main mu4e-view epa epg epg-config browse-url
longlines mu4e-headers mu4e-compose mu4e-actions org-capture org-mks
setup-org org-mode-expansions org ob-emacs-lisp ob-tangle ob-ref ob-lob
ob-table org-footnote org-src ob-comint ob-keys ob ob-eval org-pcomplete
pcomplete org-list org-faces org-compat org-entities org-macs noutline
outline cal-menu calendar cal-loaddefs rfc2368 smtpmail auth-source
gnus-util password-cache sendmail mu4e-mark mu4e-message html2text
mu4e-proc mu4e-utils doc-view jka-compr image-mode setup-dired
dired-details dired mu4e-about mu4e-vars message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader
mu4e-meta diminish mac my-misc appearance zoom-frm frame-cmds frame-fns
avoid paren hl-line key-bindings windmove smex setup-ido ido-ubiquitous
ido browse-kill-ring fill-column-indicator multifiles change-inner
smart-forward wgrep setup-rgrep grep compile comint ansi-color eproject
esh-var esh-io esh-cmd esh-ext esh-proc esh-arg eldoc esh-groups eshell
esh-module esh-mode esh-util ace-jump-mode jump-char multiple-cursors
mc-insert-numbers rectangular-region-mode mc-mark-more thingatpt
mc-cycle-cursors mc-edit-lines multiple-cursors-core rect
inline-string-rectangle mark-more-like-this mark-multiple expand-region
text-mode-expansions expand-region-custom expand-region-core file-defuns
imenu mode-mappings setup-paredit s dash regexp-opt paredit
setup-html-mode setup-ffip find-file-in-project setup-perspective
perspective setup-yasnippet buster-snippets buster-snippet-helpers
yasnippet dropdown-list derived help-mode view assoc setup-hippie
exec-path-from-shell sane-defaults uniquify undo-tree edmacro kmacro
diff cl smooth-scrolling warnings advice help-fns advice-preload subword
winner ring recentf tree-widget wid-edit easymenu delsel easy-mmode
autorevert setup-package elisp-slime-nav-autoloads es-lib-autoloads
exec-path-from-shell-autoloads gist-autoloads gh-autoloads eieio
byte-opt bytecomp byte-compile cconv macroexp git-commit-mode-autoloads
gitconfig-mode-autoloads gitignore-mode-autoloads
goto-last-change-autoloads hardcore-mode-autoloads htmlize-autoloads
logito-autoloads magit-autoloads move-text-autoloads nrepl-autoloads
clojure-mode-autoloads paredit-autoloads pcache-autoloads finder-inf
popwin-autoloads slime-js-autoloads slime-repl-autoloads slime-autoloads
package tabulated-list saveplace time-date tooltip ediff-hook vc-hooks
lisp-float-type mwheel ns-win tool-bar dnd fontset image fringe
lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer loaddefs button faces cus-face files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process ns multi-tty

--- End Message ---
--- Begin Message --- 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 <address@hidden>
> Cc: address@hidden
> 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

> 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

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


--- End Message ---

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