GNU bug report logs - #29831
25.2; ansi-term - more graceful error handling?

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

From: Live System User <nyc4bos <at> aol.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.2; ansi-term - more graceful error handling?
Date: Sun, 24 Dec 2017 01:26:50 -0500

Hi,

        I'm wondering if ansi-term could handle the following
        error more gracefully:

Debugger entered--Lisp error: (error "Invalid face" unspecified)
  internal-get-lisp-face-attribute(unspecified :foreground nil)
  face-attribute(unspecified :foreground nil default)
  face-foreground(unspecified nil default)
  term-handle-colors-array(1)
  term-handle-ansi-escape(#<process *ansi-term*> 109)
  term-emulate-terminal(#<process *ansi-term*>
  "[1;33mliveuser <at> localhost[0m:[1;32m~ [0m$ ")


        Currently, when this error ocurrs, ansi-term starts but
        doesn't display the command prompt nor can you interact
        with the ansi-term.

        You can "C-x k" (kill-buffer) and thus kill the
        ansi-term process.

        Thanks.





In GNU Emacs 25.2.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.20.10)
 of 2017-05-02 built on buildvm-17.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.11803000
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 --with-xwidgets --with-modules
 build_alias=x86_64-redhat-linux-gnu host_alias=x86_64-redhat-linux-gnu
 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g -pipe -Wall -Werror=format-security
 -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
 --param=ssp-buffer-size=4 -grecord-gcc-switches
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic'
 LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES XWIDGETS

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Messages

Minor modes in effect:
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  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
<mouse-6> is undefined
mwheel-scroll: Beginning of buffer
C-c C-g is undefined
Quit
Entering debugger...
Back to top level

Load-path shadows:
None found.

Features:
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Memory information:
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Message #8 received at 29831 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Live System User <nyc4bos <at> aol.com>
Cc: 29831 <at> debbugs.gnu.org
Subject: Re: bug#29831: 25.2; ansi-term - more graceful error handling?
Date: Sat, 30 Dec 2017 13:06:43 +0200

> From: Live System User <nyc4bos <at> aol.com>
> Date: Sun, 24 Dec 2017 01:26:50 -0500
> 
>         I'm wondering if ansi-term could handle the following
>         error more gracefully:
> 
> Debugger entered--Lisp error: (error "Invalid face" unspecified)
>   internal-get-lisp-face-attribute(unspecified :foreground nil)
>   face-attribute(unspecified :foreground nil default)
>   face-foreground(unspecified nil default)
>   term-handle-colors-array(1)
>   term-handle-ansi-escape(#<process *ansi-term*> 109)
>   term-emulate-terminal(#<process *ansi-term*>
>   "[1;33mliveuser <at> localhost[0m:[1;32m~ [0m$ ")

This sounds like a bug, but can you help me understand how did that
'unspecified' come into existence?  It looks like it comes from this
code:

                   (face-foreground
                    (elt ansi-term-color-vector term-ansi-current-color)
                    nil 'default)

but ansi-term-color-vector doesn't include any 'unspecified', and in
fact there's no "unspecified" anywhere in term.el.  What am I missing?

Does it help to customize term-default-fg-color to some non-nil value?

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