bug#34183: 27.0.50; cl-print uses print-length for strings

[Stefan Monnier]

Package: Emacs
Version: 27.0.50


The code in cl-print now obeys `print-length` to limit the length of
strings.  Being able to limit the length of strings is good, but
limiting them to `print-length` chars is rather drastic since this
setting is usually applied to lists, where a setting of N corresponds to
an output that's at the very least 2*N long (assuming each element prints
as a single char, which is not the most common case).

Currently in M-: print-length defaults to 12, so any string like a file
name gets truncated after only 12 chars which is frustrating
(especially since the ability to expand the "..." doesn't work there
because you can't click in the echo area :-( Maybe that should be
another bug report / feature request).

We should probably introduce another config var to limit string length,
or multiply `print-length` by some ad-hoc factor (like 4 maybe), or use
the max of print-length and frame-width, ...


        Stefan



In GNU Emacs 27.0.50 (build 1, x86_64-unknown-linux-gnu, GTK+ Version 3.24.3)
 of 2019-01-22 built on alfajor
Repository revision: 4e56ca18c9760d9a9429d71e36bedfe4da879a9c
Repository branch: work
Windowing system distributor 'The X.Org Foundation', version 11.0.12003000
System Description: Debian GNU/Linux buster/sid

Recent messages:
Error during redisplay: (eval el-search--current-search) signaled 
(void-variable el-search--current-search)
Error during redisplay: (eval (cdr (ring-elements el-search-history))) signaled 
(void-variable el-search-history)
Mark saved where search started [4 times]
"123456789012..."
50 (#o62, #x32, ?2)
"123456789012..."

Warning: hide-sublevels is obsolete!
Error during redisplay: (eval el-search--current-search) signaled 
(void-variable el-search--current-search)
Error during redisplay: (eval (cdr (ring-elements el-search-history))) signaled 
(void-variable el-search-history)

Configured using:
 'configure -C --enable-checking --with-modules --enable-check-lisp-object-type
 'CFLAGS=-Wall -g3 -Og -Wno-pointer-sign'
 PKG_CONFIG_PATH=/home/monnier/lib/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB
NOTIFY INOTIFY GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS CANNOT_DUMP LCMS2
GMP

Important settings:
  value of $LANG: fr_CH.UTF-8
  locale-coding-system: utf-8-unix

Major mode: InactiveMinibuffer

Minor modes in effect:
  c-electric-flag: t
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  electric-pair-mode: t
  global-reveal-mode: t
  reveal-mode: t
  auto-insert-mode: t
  savehist-mode: t
  minibuffer-electric-default-mode: t
  global-compact-docstrings-mode: t
  url-handler-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/home/monnier/src/emacs/elpa/packages/svg/svg hides 
/home/monnier/src/emacs/work/lisp/svg
/home/monnier/src/emacs/elpa/packages/ada-mode/ada-mode hides 
/home/monnier/src/emacs/work/lisp/progmodes/ada-mode
/home/monnier/src/emacs/elpa/packages/ada-mode/ada-stmt hides 
/home/monnier/src/emacs/work/lisp/progmodes/ada-stmt
/home/monnier/src/emacs/elpa/packages/ada-mode/ada-prj hides 
/home/monnier/src/emacs/work/lisp/progmodes/ada-prj
/home/monnier/src/emacs/elpa/packages/ada-mode/ada-xref hides 
/home/monnier/src/emacs/work/lisp/progmodes/ada-xref
/home/monnier/src/emacs/elpa/packages/nadvice/nadvice hides 
/home/monnier/src/emacs/work/lisp/emacs-lisp/nadvice
/home/monnier/src/emacs/elpa/packages/hyperbole/set hides 
/home/monnier/src/emacs/work/lisp/emacs-lisp/set
/home/monnier/src/emacs/elpa/packages/landmark/landmark hides 
/home/monnier/src/emacs/work/lisp/obsolete/landmark
/home/monnier/src/emacs/elpa/packages/crisp/crisp hides 
/home/monnier/src/emacs/work/lisp/obsolete/crisp

Features:
(cl finder log-view vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs vc-dir
autoload eieio-opt speedbar sb-image ezimage dframe descr-text sort
mail-extr emacsbug log-edit message sendmail rmc puny dired
dired-loaddefs format-spec rfc822 mml mml-sec epa derived epg gnus-util
rmail rmail-loaddefs time-date mm-decode mm-bodies mm-encode mail-parse
rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr mailabbrev
mail-utils ...)

Memory information:
((conses 8 332433 72233)
 (symbols 24 32361 406) (strings 16 136261 9584) (string-bytes 1 3687406)
 (vectors 8 57650)
 (vector-slots 4 2051955 154284) (floats 8 660 432) (intervals 28 20915 582)
 (buffers 528 64))