bug#18447: 24.3; transfer case doesn't work in some instances

bug#18447: 24.3; transfer case doesn't work in some instances

[Randy Yates]

(defun transfer-case-test ()
  (let ((case-fold-search t)
        (case-replace t))
  (with-current-buffer (current-buffer) 
    (insert "x86_64")(newline)
    (insert "X86_64")(newline)
    (goto-char (point-min))
    (perform-replace "x86_64" "armv7l" t nil nil nil nil nil nil))))

Evaluate transfer-case-test in a new emacs -Q to see the problem. The
resulting text in the buffer will by "armv7l\n armv7l" instead of the
expected "armv7l\n ARMV7L".

--Randy


In GNU Emacs 24.3.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.10.9)
 of 2014-08-18 on buildvm-21.phx2.fedoraproject.org
Windowing system distributor `Fedora Project', version 11.0.11404000
System Description:	Fedora release 20 (Heisenbug)

Configured using:
 `configure '--build=x86_64-redhat-linux-gnu'
 '--host=x86_64-redhat-linux-gnu' '--program-prefix='
 '--disable-dependency-tracking' '--prefix=/usr' '--exec-prefix=/usr'
 '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc'
 '--datadir=/usr/share' '--includedir=/usr/include'
 '--libdir=/usr/lib64' '--libexecdir=/usr/libexec'
 '--localstatedir=/var' '--sharedstatedir=/var/lib'
 '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--with-dbus'
 '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff'
 '--with-xft' '--with-xpm' '--with-x-toolkit=gtk3' '--with-gpm=no'
 'build_alias=x86_64-redhat-linux-gnu'
 'host_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g
 -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
 -fstack-protector-strong --param=ssp-buffer-size=4
 -grecord-gcc-switches -m64 -mtune=generic' 'LDFLAGS=-Wl,-z,relro ''

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Apropos

Minor modes in effect:
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  show-paren-mode: t
  display-time-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
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Recent input:
<backspace> s a m e SPC o n SPC f e d o r a / e m a 
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C-g C-g . 3 . 1 ) <return> i SPC w o u l d SPC e x 
a <backspace> p e c t SPC X 8 6 _ 6 4 C-a i n SPC t 
h a t SPC c a s e , SPC C-e SPC t o SPC b e SPC r e 
p l a c e d SPC w i t h SPC A R M V 7 L <return> i 
t s SPC <backspace> <backspace> SPC s n o t e . <backspace> 
<backspace> . <return> <help-echo> <help-echo> C-x 
b * G r <tab> <return> C-p M-g C-p C-u <return> 4 0 
<return> C-n C-p # # # C-e C-a C-n # # B m <return> 
SPC C-x o <help-echo> <help-echo> <help-echo> <help-echo> 
C-x o C-p C-p C-p SPC C-x o K H q y C-p M-g C-p C-u 
C-g C-x b <return> C-r y a t e s <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-v C-v M-> C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p M-% 
C-g C-g C-g C-h f b u g <return> <tab> m o d e <tab> 
<return> M-x C-g C-g C-h a r e p o r t <return> C-x 
o C-s b u g C-s C-s C-s C-s C-s C-s C-s C-s C-s C-r 
C-r <return> C-a C-p <return> C-x o C-n C-n C-n q M-: 
( <backspace> C-g M-x r e p o r t - e m a c s - b <tab> 
<return>

Recent messages:
Quit
Mark saved where search started
Mark set
Quit [3 times]
Making completion list...
Type C-x 1 to delete the help window.
Quit [2 times]
Mark saved where search started
Note: file is write protected
Type "q" in help window to restore its previous buffer.
Quit

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x-toolkit x multi-tty emacs)

bug#18447: 24.3; transfer case doesn't work in some instances

[Paul Eggert]

Thanks for the bug report.  As near as I can make out, Emacs is behaving 
according to spec, as the documentation for replace-match says:

   "If the replaced text has only capital letters and has at least one 
multiletter word, convert NEWTEXT to all caps.  Otherwise if all words are 
capitalized in the replaced text, capitalize each word in NEWTEXT."

Here neither condition applies so there's no case conversion.  This is how 
replace-match has behaved for a couple of decades.  Perhaps it'd be useful to 
have a variant that behaves differently, but I expect we'd have to make that an 
upward-compatible change somehow.

bug#18447: 24.3; transfer case doesn't work in some instances

[Stefan Kangas]

Paul Eggert <eggert@cs.ucla.edu> writes:

> Thanks for the bug report.  As near as I can make out, Emacs is behaving
> according to spec, as the documentation for replace-match says:
>
>   "If the replaced text has only capital letters and has at least one
>   multiletter word, convert NEWTEXT to all caps.  Otherwise if all words are
> capitalized in the replaced text, capitalize each word in NEWTEXT."
>
> Here neither condition applies so there's no case conversion.  This is how
> replace-match has behaved for a couple of decades.  Perhaps it'd be useful to
> have a variant that behaves differently, but I expect we'd have to make that an
> upward-compatible change somehow.

I think that there is no bug here, and we have seen no further comments
in 5 years.  I'm therefore closing this bug.  If that's incorrect,
please reopen the bug report.

Best regards,
Stefan Kangas