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bug#4118: 23.1; eval-last-sexp-print-value is inconvenient

From: Eli Barzilay
Subject: bug#4118: 23.1; eval-last-sexp-print-value is inconvenient
Date: Tue, 11 Aug 2009 06:55:30 -0400

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

  `eval-last-sexp' is often useful with a prefix argument inside a
  buffer for all kinds of programmatic uses (for example, make a
  keyboard macro that massages some text into an S-expression, then
  use it to plant the result in the buffer).  This uses
  `eval-last-sexp-print-value', which will "helpfully" insert other
  junk into the buffer (the hex and the octal representations of the
  number).  This is cute to have on the echo area, but annoying for
  such use in macros.  It would be better to disable this extra output
  in the case of non-echo-area output.

  I have a rather simple solution -- redefine the
  `eval-last-sexp-print-value' function with an extra condition

      (let ((str (and (eq standard-output t) ; <--- HERE
                      (eval-expression-print-format value))))
        (if str (princ str)))

  which works reasonably well.

In GNU Emacs 23.1.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.10.14)
 of 2009-08-01 on winooski.ccs.neu.edu
Windowing system distributor `The X.Org Foundation', version 11.0.10300000
configured using `configure  '--prefix=/home/eli/bin/local/emacs-dir''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: POSIX
  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: en_US
  value of $XMODIFIERS: nil
  locale-coding-system: iso-latin-1-unix
  default-enable-multibyte-characters: t

Major mode: Text

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x r e p o <tab> r <tab> <return>

Recent messages:
Loading ~/MyEmacs/pre...done
Loading ~/EliEmacs/eliemacs...done
Loading ~/MyEmacs/post...done
Making completion list...

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