GNU bug report logs - #7812
add a diff-list custom type; use it for compilation-error-regexp-alist

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Dave Abrahams <dave <at> boostpro.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 23.2;
	compilation-error-regexp-alist extremely unfriendly to customization
	interface
Date: Sun, 09 Jan 2011 21:03:10 -0500

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the bug-gnu-emacs <at> gnu.org mailing list,
and to the gnu.emacs.bug news group.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug.  If you can, give
a recipe starting from `emacs -Q':


It was never awesome: it *should* be possible to add support for a
couple of unique tools without losing the benefits of all the builtin
matchers that will come along next time I upgrade emacs.  It has
always been the case that if I customize one or two of these elements,
I'll never see new ones that are supplied by the maintainers on
upgrade...

...but now things are worse: I can't even add new alist elements
through the customize interface, and if do I add a single new one
using setq, all I see in the customize interface thenceforth is:

  (mapcar 'car compilation-error-regexp-alist-alist)

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/Applications/Emacs.app/Contents/Resources/etc/DEBUG.


In GNU Emacs 23.2.1 (x86_64-apple-darwin, NS apple-appkit-1038.29)
 of 2010-05-08 on black.local
Windowing system distributor `Apple', version 10.3.1038
configured using `configure  '--host=x86_64-apple-darwin' '--build=i686-apple-darwin' '--with-ns' 'build_alias=i686-apple-darwin' 'host_alias=x86_64-apple-darwin' 'CC=gcc -mmacosx-version-min=10.5''

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: nil
  default enable-multibyte-characters: t

Major mode: Custom

Minor modes in effect:
  recentf-mode: t
  global-auto-complete-mode: t
  yas/global-mode: t
  show-paren-mode: t
  server-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-p C-p <return> C-x b * <right> <return> C-p C-p C-p 
C-p C-e C-n C-e C-, C-, C-. C-. C-, C-, C-. C-d C-d 
C-n C-n C-n C-x C-e C-x C-b C-x C-p M-x C-g C-g <f7> 
y <f4> <f4> <S-f4> <S-f4> <f4> <f4> <f4> <f4> <S-f4> 
<S-f4> <S-f4> <S-f4> <f4> <S-f4> <S-f4> C-x C-p <down-mouse-1> 
<mouse-1> 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 C-p C-p C-p C-p C-a C-p C-p <return> C-x C-n 
C-x C-n C-. C-. C-. C-. C-. C-. C-a C-. C-. C-. C-. 
C-. C-. C-a C-. C-. C-. C-, C-, C-. C-. C-, C-b C-b 
C-b C-f C-SPC C-. C-. C-f M-w C-p C-n C-n C-a C-n C-p 
C-p C-p <return> # i f SPC 0 C-n C-n C-n C-e <return> 
# d e <backspace> <backspace> e n d i f C-x C-s C-n 
C-n C-n C-a C-n C-n C-n C-n C-n C-p C-p C-p C-p C-n 
C-. C-. C-. C-. C-, C-s C-w C-w C-w C-w C-w C-w C-r 
C-r C-x C-p C-x C-b C-x C-b C-x C-b C-x C-b C-x C-b 
C-_ C-_ C-x C-s C-g C-x C-b C-x C-b M-x c u s t o <tab> 
- v a r <tab> <return> M-p <return> M-> M-< 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-. C-, M-> 
M-< M-> M-< M-> M-< M-> M-< SPC <down-mouse-1> <mouse-1> 
<down-mouse-1> <mouse-movement> <mouse-movement> <drag-mouse-1> 
<down-mouse-1> <mouse-1> M-< C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-p C-n C-x C-b C-x C-b C-x C-b 
C-x C-b C-x C-b C-x C-b C-x C-b C-x C-b C-x C-b C-x 
C-b C-x C-b C-x C-b C-x b <right> <right> <right> <return> 
M-x r e p o r t - e m <tab> b u <tab> <return>

Recent messages:
Mark set [2 times]
Saving file /Users/dave/src/embarc/llvm/tools/clang/test/SemaCXX/expression-traits.cpp...
Wrote /Users/dave/src/embarc/llvm/tools/clang/test/SemaCXX/expression-traits.cpp
Undo! [2 times]
Quit
Creating customization items...
Creating customization items ...done
Resetting customization items...done
Creating customization setup...done
Mark set [12 times]

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/Users/dave/.emacs.d/3rd-party/package.d/tramp/lisp/tramp-fish hides /Applications/Emacs.app/Contents/Resources/lisp/net/tramp-fish
/Users/dave/.emacs.d/3rd-party/package.d/tramp/lisp/tramp-compat hides /Applications/Emacs.app/Contents/Resources/lisp/net/tramp-compat
/Users/dave/.emacs.d/3rd-party/package.d/tramp/lisp/tramp-cmds hides /Applications/Emacs.app/Contents/Resources/lisp/net/tramp-cmds
/Users/dave/.emacs.d/3rd-party/package.d/tramp/lisp/tramp-cache hides /Applications/Emacs.app/Contents/Resources/lisp/net/tramp-cache
/Users/dave/.emacs.d/3rd-party/package.d/tramp/lisp/socks hides /Applications/Emacs.app/Contents/Resources/lisp/net/socks
/Users/dave/.emacs.d/3rd-party/package.d/flim/lisp/flim/sasl hides /Applications/Emacs.app/Contents/Resources/lisp/net/sasl
/Users/dave/.emacs.d/3rd-party/package.d/flim/lisp/flim/sasl-ntlm hides /Applications/Emacs.app/Contents/Resources/lisp/net/sasl-ntlm
/Users/dave/.emacs.d/3rd-party/package.d/flim/lisp/flim/sasl-digest hides /Applications/Emacs.app/Contents/Resources/lisp/net/sasl-digest
/Users/dave/.emacs.d/3rd-party/package.d/flim/lisp/flim/sasl-cram hides /Applications/Emacs.app/Contents/Resources/lisp/net/sasl-cram
/Users/dave/.emacs.d/3rd-party/package.d/flim/lisp/flim/ntlm hides /Applications/Emacs.app/Contents/Resources/lisp/net/ntlm
/Users/dave/.emacs.d/3rd-party/package.d/flim/lisp/flim/hmac-md5 hides /Applications/Emacs.app/Contents/Resources/lisp/net/hmac-md5
/Users/dave/.emacs.d/3rd-party/package.d/flim/lisp/flim/hmac-def hides /Applications/Emacs.app/Contents/Resources/lisp/net/hmac-def
/Users/dave/.emacs.d/3rd-party/package.d/wanderlust/lisp/wl/rfc2368 hides /Applications/Emacs.app/Contents/Resources/lisp/mail/rfc2368
/Users/dave/.emacs.d/3rd-party/package.d/wanderlust/lisp/wl/utf7 hides /Applications/Emacs.app/Contents/Resources/lisp/gnus/utf7
/Users/dave/.emacs.d/3rd-party/package.d/semi/lisp/semi/smime hides /Applications/Emacs.app/Contents/Resources/lisp/gnus/smime
/Users/dave/.emacs.d/3rd-party/package.d/planner/contrib/timeclock hides /Applications/Emacs.app/Contents/Resources/lisp/calendar/timeclock

Features:
(shadow emacsbug multi-isearch compile w3m-form w3m-symbol mule-util
w3m-cookie w3m-bookmark w3m-tabmenu w3m-session w3m doc-view jka-compr
image-mode dired w3m-hist w3m-fb w3m-ems w3m-ccl w3m-favicon w3m-image
w3m-proc w3m-util thingatpt browse-url vc-git code-settings cus-edit
cc-mode cc-fonts cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars
cc-defs recentf tree-widget org-clock smiley mel-q-ccl url-http tls
url-auth url-gw wl-score ssl elmo-nntp elmo-sendlog elmo-internal
elmo-filter elmo-imap4 time-stamp elmo-net elmo-dop elmo-cache
elmo-map hl-line modb-legacy modb-standard wl-mime mime-edit pgg-parse
pccl pccl-20 ccl mailalias mime-setup mail-mime-setup semi-setup
mime-pgp pgg-def mime-play filename mime-image wl-demo wl-draft
eword-encode wl-template sendmail wl-news derived wl-address wl-thread
wl-folder wl-spam wl-action elmo-spam elsp-header elsp-generic
wl-gravatar gravatar url-cache url url-proxy url-privacy url-expand
url-methods url-history url-cookie url-util url-parse url-vars bbdb
signature org-wl filladapt wl-summary ps-print ps-def lpr wl-refile
wl-message elmo-mime mmelmo-buffer mmelmo-imap mime-view calist
semi-def mmimap mime-parse mmbuffer mmgeneric wl-highlight elmo-multi
mime-conf wl wl-e21 wl-util elmo-flag elmo-localdir wl-vars wl-version
elmo elmo-signal elmo-msgdb modb modb-generic modb-entity mime
elmo-util emu invisible inv-23 poem poem-e20 poem-e20_3 utf7
eword-decode std11 elmo-date timezone elmo-vars elmo-version luna
gnus-cite mailcrypt gnus-msg gnus-art mm-uu mml2015 mm-view smime mel
mime-def alist mcharset mcs-20 mcs-e20 pces pces-e20 pces-20 broken
pcustom path-util poe pym static apel-ver product gnus-sum nnoo
gnus-group gnus-undo nnmail mail-source format-spec gnus-start
gnus-spec gnus-int gnus-range gnus-win message ecomplete rfc822 mml
mml-sec password-cache mm-decode mm-bodies mm-encode mailcap
mail-parse rfc2231 rfc2047 rfc2045 qp ietf-drums mailabbrev gmm-utils
mailheader canlock sha1 sha1-el hex-util hashcash tabify org-archive
org-mobile cal-china lunar solar cal-dst cal-bahai cal-islam
cal-hebrew holidays hol-loaddefs diary-lib diary-loaddefs cal-iso
my-xmlunicode quail epg epg-config disp-table org-eval org-bookmark
bookmark pp org-mac-message org-habit org-id org-crypt org-agenda org
byte-opt bytecomp byte-compile ob-emacs-lisp ob-tangle ob-ref ob-lob
ob-table org-footnote org-src ob-comint comint ring ob-keys ob ob-eval
org-complete pcomplete org-list org-faces org-compat org-entities
org-macs noutline outline easy-mmode regexp-opt cal-menu calendar
cal-loaddefs package reporter init w3m-load remember-autoloads
planner-autoloads muse-autoloads color-theme-autoloads bbdb-autoloads
my-loaddefs auto-complete-config auto-complete popup ido maxframe
osx-plist xml windmove ffap dwa-util initsplit find-func yasnippet
advice advice-preload edmacro kmacro help-mode view assoc cl cl-19
paren server gnus gnus-ems nnheader gnus-util netrc time-date
mail-utils mm-util mail-prsvr wid-edit autorevert delsel cus-start
cus-load autoload help-fns org-install tooltip ediff-hook vc-hooks
lisp-float-type mwheel ns-win easymenu tool-bar dnd fontset image
fringe lisp-mode register page menu-bar rfn-eshadow timer select
scroll-bar mldrag 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 loaddefs button minibuffer faces
cus-face files text-properties overlay md5 base64 format env
code-pages mule custom widget hashtable-print-readable backquote
make-network-process ns multi-tty emacs)


-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com

Message #8 received at 7812 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Dave Abrahams <dave <at> boostpro.com>
Cc: 7812 <at> debbugs.gnu.org
Subject: Re: bug#7812: 23.2;
	compilation-error-regexp-alist extremely unfriendly to customization
	interface
Date: Wed, 19 Jan 2011 18:25:26 -0500

Dave Abrahams wrote:

[customizing compilation-error-regexp-alist]

> It was never awesome: it *should* be possible to add support for a
> couple of unique tools without losing the benefits of all the builtin
> matchers that will come along next time I upgrade emacs.  It has
> always been the case that if I customize one or two of these elements,
> I'll never see new ones that are supplied by the maintainers on
> upgrade...

That is a general issue with customize, albeit more of one for options
with long, complicated values where new ones might be added to the old
elements.

There is M-x customize-changed to point out where options have changed
since a given Emacs release. In an ideal world maybe there could be
some automatic, version-control like merging of options when you start
a new Emacs version for the first time.

> ...but now things are worse: I can't even add new alist elements
> through the customize interface, and if do I add a single new one
> using setq, all I see in the customize interface thenceforth is:
>
>   (mapcar 'car compilation-error-regexp-alist-alist)

compilation-error-regexp-alist has a bad custom :type. It does not
allow you to do anything other than turn on/off the default settings.
It is impossible to add a new element via customize, and doing so by
hand will produce a mismatch.

AFAICS, it isn't possible to have a custom type that allows you to both:

i) toggle on/off the predefined options
ii) add new elements of your own

So feature i) will probably have to go.

Message #11 received at 7812 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: 7812 <at> debbugs.gnu.org
Subject: Re: bug#7812: 23.2;
	compilation-error-regexp-alist extremely unfriendly to customization
	interface
Date: Wed, 19 Jan 2011 18:27:53 -0500

PS I think this should be fixed before 23.3.

Message #14 received at 7812 <at> debbugs.gnu.org (full text, mbox):

From: Dave Abrahams <dave <at> boostpro.com>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 7812 <at> debbugs.gnu.org
Subject: Re: bug#7812: 23.2;
	compilation-error-regexp-alist extremely unfriendly to customization
	interface
Date: Wed, 19 Jan 2011 22:30:16 -0500

At Wed, 19 Jan 2011 18:25:26 -0500,
Glenn Morris wrote:
> 
> Dave Abrahams wrote:
> 
> [customizing compilation-error-regexp-alist]
> 
> > It was never awesome: it *should* be possible to add support for a
> > couple of unique tools without losing the benefits of all the builtin
> > matchers that will come along next time I upgrade emacs.  It has
> > always been the case that if I customize one or two of these elements,
> > I'll never see new ones that are supplied by the maintainers on
> > upgrade...
> 
> That is a general issue with customize, albeit more of one for options
> with long, complicated values where new ones might be added to the old
> elements.

Yes, but you *can* design the module so as to make it a non-issue.
Give people a customizable variable that is solely for their own use,
and give them a way to override the contents of the base alist, which
is not customizable but updated with the module.

> There is M-x customize-changed to point out where options have changed
> since a given Emacs release. In an ideal world maybe there could be
> some automatic, version-control like merging of options when you start
> a new Emacs version for the first time.
> 
> > ...but now things are worse: I can't even add new alist elements
> > through the customize interface, and if do I add a single new one
> > using setq, all I see in the customize interface thenceforth is:
> >
> >   (mapcar 'car compilation-error-regexp-alist-alist)
> 
> compilation-error-regexp-alist has a bad custom :type. It does not
> allow you to do anything other than turn on/off the default settings.
> It is impossible to add a new element via customize, and doing so by
> hand will produce a mismatch.
> 
> AFAICS, it isn't possible to have a custom type that allows you to both:
> 
> i) toggle on/off the predefined options
> ii) add new elements of your own
> 
> So feature i) will probably have to go.

The problem is with the design that mashes all this functionality
together into a single customization variable.  Just use separate
variables for separate concerns, and you'll be golden.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com

Message #20 received at 7812 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Dave Abrahams <dave <at> boostpro.com>
Cc: Glenn Morris <rgm <at> gnu.org>, 7812 <at> debbugs.gnu.org
Subject: Re: bug#7812: 23.2;
	compilation-error-regexp-alist extremely unfriendly to customization
	interface
Date: Thu, 20 Jan 2011 10:49:40 -0500

> Yes, but you *can* design the module so as to make it a non-issue.
> Give people a customizable variable that is solely for their own use,
> and give them a way to override the contents of the base alist, which
> is not customizable but updated with the module.

That's one option.  Another (which I prefer) is to use a defcustom
that lets the user add-to-front, add-to-rear, and remove elements.

Someone had proposed such a `diff-list' thingy for load-path at
some point.  I really think we should try to get such a thing working.


        Stefan

Message #23 received at 7812 <at> debbugs.gnu.org (full text, mbox):

From: Dave Abrahams <dave <at> boostpro.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Glenn Morris <rgm <at> gnu.org>, 7812 <at> debbugs.gnu.org
Subject: Re: bug#7812: 23.2; compilation-error-regexp-alist extremely
	unfriendly to customization interface
Date: Thu, 20 Jan 2011 13:22:41 -0500

On Thu, Jan 20, 2011 at 10:49 AM, Stefan Monnier
<monnier <at> iro.umontreal.ca> wrote:
>> Yes, but you *can* design the module so as to make it a non-issue.
>> Give people a customizable variable that is solely for their own use,
>> and give them a way to override the contents of the base alist, which
>> is not customizable but updated with the module.
>
> That's one option.  Another (which I prefer) is to use a defcustom
> that lets the user add-to-front, add-to-rear, and remove elements.
>
> Someone had proposed such a `diff-list' thingy for load-path at
> some point.  I really think we should try to get such a thing working.

More power to ya if you do!  However, this problem *can* be solved,
perhaps less-elegantly, but entirely within the `compile' library.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com

Message #26 received at 7812 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Dave Abrahams <dave <at> boostpro.com>, 7812 <at> debbugs.gnu.org
Subject: Re: bug#7812: 23.2;
	compilation-error-regexp-alist extremely unfriendly to customization
	interface
Date: Fri, 21 Jan 2011 00:04:43 -0500

I've simply fixed the custom :type for 23.3.

Until a diff-list [1] custom type exists, If I wanted to add an
element to this list in my .emacs, and still get any updated defaults
in future new versions of Emacs, I might do something like:

(eval-after-load "compile"
  '(add-to-list 'compilation-error-regexp-alist ... ))


[1] http://lists.gnu.org/archive/html/emacs-devel/2001-12/msg00264.html

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