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Subject: bug#34224: 25.1; ansi-term displays garbage on tree(1) command
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The ansi-term (and likewise, term) modes fail to properly display the
Unicode drawing characters used by the tree(1) command. Steps to
reproduce:

1. Run M-x ansi-term
2. Switch to the directory you want to tree(1)
3. Execute tree command
4. The output looks like this:

    testtree
    0tqq Ba
    0tqq Bb
    0x   tqq Bb-a
    0x   mqq Bb-b
    0mqq Bc

Whereas it should look like this:

    testtree
    =E2=94=9C=E2=94=80=E2=94=80 a
    =E2=94=9C=E2=94=80=E2=94=80 b
    =E2=94=82   =E2=94=9C=E2=94=80=E2=94=80 b-a
    =E2=94=82   =E2=94=94=E2=94=80=E2=94=80 b-b
    =E2=94=94=E2=94=80=E2=94=80 c

This is on Debian Linux using the GUI emacs.



In GNU Emacs 25.1.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
 of 2017-09-15, modified by Debian built on trouble
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description:	Debian GNU/Linux 9.7 (stretch)

Configured using:
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 --sharedstatedir=3D/var/lib --libexecdir=3D/usr/lib
 --localstatedir=3D/var/lib --infodir=3D/usr/share/info
 --mandir=3D/usr/share/man --with-pop=3Dyes
 --enable-locallisppath=3D/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25=
.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.1/site-li=
sp:/usr/share/emacs/site-lisp
 --with-sound=3Dalsa --build x86_64-linux-gnu --prefix=3D/usr
 --sharedstatedir=3D/var/lib --libexecdir=3D/usr/lib
 --localstatedir=3D/var/lib --infodir=3D/usr/share/info
 --mandir=3D/usr/share/man --with-pop=3Dyes
 --enable-locallisppath=3D/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25=
.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.1/site-li=
sp:/usr/share/emacs/site-lisp
 --with-sound=3Dalsa --with-x=3Dyes --with-x-toolkit=3Dgtk3
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ector-strong
 -Wformat -Werror=3Dformat-security -Wall' 'CPPFLAGS=3D-Wdate-time
 -D_FORTIFY_SOURCE=3D2' LDFLAGS=3D-Wl,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
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  value of $LANG: de_DE.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Term

Minor modes in effect:
  tooltip-mode: t
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  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 messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

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Features:
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Memory information:
((conses 16 90204 7403)
 (symbols 48 20271 0)
 (miscs 40 53 146)
 (strings 32 15590 4312)
 (string-bytes 1 444050)
 (vectors 16 12487)
 (vector-slots 8 438436 6828)
 (floats 8 164 11)
 (intervals 56 329 17)
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: m-guelker@HIDDEN (Marvin =?UTF-8?Q?G=C3=BClker?=)
Subject: bug#34224: Acknowledgement (25.1; ansi-term displays garbage on
 tree(1) command)
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Subject: bug#34224: 25.1; ansi-term displays garbage on tree(1) command
Resent-From: Phil Sainty <psainty@HIDDEN>
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From: Phil Sainty <psainty@HIDDEN>
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Date: Tue, 29 Jan 2019 00:03:53 +1300
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FYI I can't replicate that in 25.3 or 26.1 under Ubuntu GNU/Linux 18.04.

(i.e. The tree output looks correct to me.)

Does the same thing happen if you run emacs -Q ?

Are you able to install 25.3 for testing?

Perhaps this is just a font problem at your end?


-Phil

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Subject: bug#34224: 25.1; ansi-term displays garbage on tree(1) command
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Am 29. Januar 2019 um 00:03 Uhr +1300 schrieb Phil Sainty:
> FYI I can't replicate that in 25.3 or 26.1 under Ubuntu GNU/Linux 18.04.
> 
> (i.e. The tree output looks correct to me.)
> 
> Does the same thing happen if you run emacs -Q ?

Yes, it happens with emacs -Q. But when I reported the bug, I forgot
that since pretty much forever I had an alias for "tree" in my zsh
config that aliases the tree command to "tree -AC". Removing the alias
solves the problem. Fiddling shows the it's the -A option that causes
the problem. So, the actual problem is that ansi-term doesn't work
with tree's -A option.

Given that the -A option is declared as a "hack" in tree's manual page,
I don't know whether it should actually be cared about. I don't really
remember what made me turn this option on in my alias. Since a few years
I use urxvt as my terminal emulator, so it might have been a faulty
terminal emulator. When I switched to urxvt, I probably forgot about
it. urxvt never had a problem with that option, though.

> Are you able to install 25.3 for testing?

Yes, I just compiled it from source. The problem still exists with emacs
25.3.

> Perhaps this is just a font problem at your end?

See above; it's tree's -A option.

Marvin

-- 
Blog: https://mg.guelker.eu
PGP/GPG ID: F1D8799FBCC8BC4F

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> Date: Mon, 28 Jan 2019 14:10:53 +0100
> From: Marvin Gülker <m-guelker@HIDDEN>
> Cc: 34224 <at> debbugs.gnu.org
> 
> Yes, it happens with emacs -Q. But when I reported the bug, I forgot
> that since pretty much forever I had an alias for "tree" in my zsh
> config that aliases the tree command to "tree -AC". Removing the alias
> solves the problem. Fiddling shows the it's the -A option that causes
> the problem. So, the actual problem is that ansi-term doesn't work
> with tree's -A option.
> 
> Given that the -A option is declared as a "hack" in tree's manual page,
> I don't know whether it should actually be cared about.

If someone can tell what does 'tree' do to "turn on ANSI line graphics
hack", then perhaps we could decide whether there's something wrong
with how Emacs interprets the bytestream delivered to it by 'tree' in
this mode.

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On 2019-01-29 04:47, Eli Zaretskii wrote:
> If someone can tell what does 'tree' do to "turn on ANSI line graphics
> hack", then perhaps we could decide whether there's something wrong
> with how Emacs interprets the bytestream delivered to it by 'tree' in
> this mode.

Does this help?


$ tree -A | cat -v
.
^[(0tqq ^[(Bbar
^[(0tqq ^[(Bfoo
^[(0mqq ^[(Bsubdir
^[(0    tqq ^[(Bbar
^[(0    mqq ^[(Bfoo

1 directory, 4 files


$ tree -A
.
0tqq Bbar
0tqq Bfoo
0mqq Bsubdir
0    tqq Bbar
0    mqq Bfoo

1 directory, 4 files


$ tree
.
├── bar
├── foo
└── subdir
     ├── bar
     └── foo

1 directory, 4 files


I note that the 'tqq' and 'mqq' match up with the VT column at:

http://www.robelle.com/smugbook/linedraw.html

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From: Eli Zaretskii <eliz@HIDDEN>
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severity 34224 wishlist
thanks

> Date: Tue, 29 Jan 2019 10:10:54 +1300
> From: Phil Sainty <psainty@HIDDEN>
> Cc: Marvin Gülker <m-guelker@HIDDEN>,
>  34224 <at> debbugs.gnu.org
> 
> On 2019-01-29 04:47, Eli Zaretskii wrote:
> > If someone can tell what does 'tree' do to "turn on ANSI line graphics
> > hack", then perhaps we could decide whether there's something wrong
> > with how Emacs interprets the bytestream delivered to it by 'tree' in
> > this mode.
> 
> Does this help?
> 
> 
> $ tree -A | cat -v
> .
> ^[(0tqq ^[(Bbar
> ^[(0tqq ^[(Bfoo
> ^[(0mqq ^[(Bsubdir
> ^[(0    tqq ^[(Bbar
> ^[(0    mqq ^[(Bfoo
> 
> 1 directory, 4 files

Yes, thanks.  These are escape sequences which term.el doesn't
currently support:

  (defun term-emulate-terminal (proc str)
  [...]
		  ;; Ignore NUL, Shift Out, Shift In.
		  ((or ?\0 #xE #xF 'nil) nil))

Patches to add such support are welcome.

Message received at control <at> debbugs.gnu.org:

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Date: Tue, 29 Jan 2019 18:17:00 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Phil Sainty <psainty@HIDDEN>
In-reply-to: <4734c77f267638c51f581a8587948513@HIDDEN> (message
 from Phil Sainty on Tue, 29 Jan 2019 10:10:54 +1300)
Subject: Re: bug#34224: 25.1; ansi-term displays garbage on tree(1) command
References: <87munm7z0o.fsf@HIDDEN>
 <9e65e535-9295-14b1-86ca-8372eeebcb58@HIDDEN>
 <20190128131053.fdxv6giultliuocn@atlantis> <83zhrk3hsy.fsf@HIDDEN>
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severity 34224 wishlist
thanks

> Date: Tue, 29 Jan 2019 10:10:54 +1300
> From: Phil Sainty <psainty@HIDDEN>
> Cc: Marvin Gülker <m-guelker@HIDDEN>,
>  34224 <at> debbugs.gnu.org
> 
> On 2019-01-29 04:47, Eli Zaretskii wrote:
> > If someone can tell what does 'tree' do to "turn on ANSI line graphics
> > hack", then perhaps we could decide whether there's something wrong
> > with how Emacs interprets the bytestream delivered to it by 'tree' in
> > this mode.
> 
> Does this help?
> 
> 
> $ tree -A | cat -v
> .
> ^[(0tqq ^[(Bbar
> ^[(0tqq ^[(Bfoo
> ^[(0mqq ^[(Bsubdir
> ^[(0    tqq ^[(Bbar
> ^[(0    mqq ^[(Bfoo
> 
> 1 directory, 4 files

Yes, thanks.  These are escape sequences which term.el doesn't
currently support:

  (defun term-emulate-terminal (proc str)
  [...]
		  ;; Ignore NUL, Shift Out, Shift In.
		  ((or ?\0 #xE #xF 'nil) nil))

Patches to add such support are welcome.

Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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