GNU bug report logs - #23509
24.4; initial-buffer-choice bug with zero-argument lambda

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

From: "Alfonsogonzalez, Ernesto (GE Digital)" <ernesto.alfonsogonzalez <at> ge.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 24.4; initial-buffer-choice bug with zero-argument lambda
Date: Tue, 10 May 2016 18:54:40 +0000

1. create file /tmp/emacs-bug.el with contents

(setq initial-buffer-choice
      ;"~/";;works
      (lambda ()
	'(call-interactively 'org-agenda-list)
	"*Org Agenda*"
	"~/");;doesn't work, opens scratch buffer
      )

2. emacs -Q -l /tmp/emacs-bug.el
3. scratch buffer opens. 

According to docs, 

If the value is nil and `inhibit-startup-screen' is nil, show the
startup screen.  If the value is a string, switch to a buffer
visiting the file or directory that the string specifies.  If the
value is a function, call it with no arguments and switch to the buffer
that it returns.  If t, open the `*scratch*' buffer.
If the value is nil and `inhibit-startup-screen' is nil, show the
startup screen.  If the value is a string, switch to a buffer
visiting the file or directory that the string specifies.  If the
value is a function, call it with no arguments and switch to the buffer
that it returns.  If t, open the `*scratch*' buffer.




In GNU Emacs 24.4.1 (x86_64-pc-linux-gnu, GTK+ Version 3.14.5)
 of 2015-03-07 on trouble, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11604000
System Description:	Debian GNU/Linux 8.4 (jessie)

Configured using:
 `configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.4/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.4/site-lisp:/usr/share/emacs/site-lisp
 --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.4/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.4/site-lisp:/usr/share/emacs/site-lisp
 --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
 'CFLAGS=-g -O2 -fstack-protector-strong -Wformat
 -Werror=format-security -Wall' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-z,relro'

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

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-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 r <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
<f1> C-v is undefined

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
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japanese hebrew greek romanian slovak czech european ethiopic indian
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custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 71134 7300)
 (symbols 48 17572 0)
 (miscs 40 36 138)
 (strings 32 9071 4631)
 (string-bytes 1 250236)
 (vectors 16 8912)
 (vector-slots 8 383117 18328)
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 (buffers 960 11)
 (heap 1024 49511 878))

Message #8 received at 23509 <at> debbugs.gnu.org (full text, mbox):

From: John Mastro <john.b.mastro <at> gmail.com>
To: 23509 <at> debbugs.gnu.org
Cc: "Alfonsogonzalez, Ernesto \(GE Digital\)" <ernesto.alfonsogonzalez <at> ge.com>
Subject: Re: bug#23509: 24.4;
 initial-buffer-choice bug with zero-argument lambda
Date: Tue, 10 May 2016 13:07:30 -0700

Alfonsogonzalez, Ernesto (GE Digital) <ernesto.alfonsogonzalez <at> ge.com> wrote:

> 1. create file /tmp/emacs-bug.el with contents
>
> (setq initial-buffer-choice
>       ;"~/";;works
>       (lambda ()
>         '(call-interactively 'org-agenda-list)
>         "*Org Agenda*"
>         "~/");;doesn't work, opens scratch buffer
>       )
>
> 2. emacs -Q -l /tmp/emacs-bug.el
> 3. scratch buffer opens.
>
> According to docs,
>
> If the value is nil and `inhibit-startup-screen' is nil, show the
> startup screen.  If the value is a string, switch to a buffer
> visiting the file or directory that the string specifies.  If the
> value is a function, call it with no arguments and switch to the buffer
> that it returns.  If t, open the `*scratch*' buffer.
> If the value is nil and `inhibit-startup-screen' is nil, show the
> startup screen.  If the value is a string, switch to a buffer
> visiting the file or directory that the string specifies.  If the
> value is a function, call it with no arguments and switch to the buffer
> that it returns.  If t, open the `*scratch*' buffer.

The docs you quoted say "if the value is a function, call it with no
arguments and switch to the buffer that it returns", but your function
does not return a buffer (it returns the string "~/").

I'm not sure what your ultimate intent was. However, if you're trying to
run `org-agenda-list' but show a buffer visiting your home directory,
maybe this will help:

(setq initial-buffer-choice
      (lambda ()
        (org-agenda-list)
        (find-file "~/")))

The difference is that `find-file' visits "~/" and returns a buffer. I
omitted the "*Org Agenda*" line from your example because it has no
effect.

-- 
john

Message #11 received at 23509 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: "Alfonsogonzalez\, Ernesto \(GE Digital\)" <ernesto.alfonsogonzalez <at> ge.com>
Cc: 23509 <at> debbugs.gnu.org
Subject: Re: bug#23509: 24.4;
 initial-buffer-choice bug with zero-argument lambda
Date: Tue, 10 May 2016 22:12:44 +0200

"Alfonsogonzalez, Ernesto (GE Digital)" <ernesto.alfonsogonzalez <at> ge.com>
writes:

> (setq initial-buffer-choice
>       ;"~/";;works
>       (lambda ()
> 	'(call-interactively 'org-agenda-list)
> 	"*Org Agenda*"
> 	"~/");;doesn't work, opens scratch buffer
>       )

> If the value is nil and `inhibit-startup-screen' is nil, show the
> startup screen.  If the value is a string, switch to a buffer
> visiting the file or directory that the string specifies.  If the
> value is a function, call it with no arguments and switch to the buffer
> that it returns.

Your function doesn't return a buffer.


Michael.

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