GNU bug report logs - #73951
29.4; 'what-cursor-position' reports SPC instead of TAB in term-mode

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

From: toomas <at> rosin.ee
To: bug-gnu-emacs <at> gnu.org
Subject: 29.4; 'what-cursor-position' reports SPC instead of TAB in term-mode
Date: Tue, 22 Oct 2024 19:35:42 +0300

How to reproduce on my system:

Start: emacs -Q
Type: M-x term RET
On Emacs prompt "Run program: /bin/bash", type: RET
The *terminal* buffer appears.
On Bash prompt, type: echo 'a TAB b' RET
Bash prints: "a	b" (a TAB b), and displays new prompt.
Type: <up> <left> <left> <left>
(The cursor is now on the tab character between a and b.)
Type: C-x =

I expect Emacs to report "Char: TAB" (etc.), but instead it responds with "Char: SPC" (etc.)

This can be really confusing when a command containing tab characters behaves unexpectedly and I want to check if I typed it right.


In GNU Emacs 29.4 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41)
 of 2024-09-28 built on localhost
Windowing system distributor 'The X.Org Foundation', version 11.0.12101013
System Description: Gentoo Linux

Configured using:
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Configured features:
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Important settings:
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Major mode: Shell-script

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Message #8 received at 73951 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: toomas <at> rosin.ee
Cc: 73951 <at> debbugs.gnu.org
Subject: Re: bug#73951: 29.4;
 'what-cursor-position' reports SPC instead of TAB in term-mode
Date: Tue, 22 Oct 2024 20:40:57 +0300

> From: toomas <at> rosin.ee
> Date: Tue, 22 Oct 2024 19:35:42 +0300
> 
> 
> How to reproduce on my system:
> 
> Start: emacs -Q
> Type: M-x term RET
> On Emacs prompt "Run program: /bin/bash", type: RET
> The *terminal* buffer appears.
> On Bash prompt, type: echo 'a TAB b' RET
> Bash prints: "a	b" (a TAB b), and displays new prompt.

I cannot reproduce this because when I press TAB, I get a bell,
i.e. TAB is not printed.  Which is consistent with what TAB produces
outside Emacs, when I type it at Bash prompt: Bash attempts to perform
completion on what I typed.

So I guess your recipe is missing something, or maybe your Bash init
file customizes Bash in some way.

If someone can reproduce this, please tell if I'm missing something
here.

Message #11 received at 73951 <at> debbugs.gnu.org (full text, mbox):

From: Toomas Rosin <toomas <at> rosin.ee>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 73951 <at> debbugs.gnu.org
Subject: Re: bug#73951: 29.4;
 'what-cursor-position' reports SPC instead of TAB in term-mode
Date: Wed, 23 Oct 2024 17:00:08 +0300

Eli Zaretskii <eliz <at> gnu.org> wrote:

> > Start: emacs -Q
> > Type: M-x term RET
> > On Emacs prompt "Run program: /bin/bash", type: RET
> > The *terminal* buffer appears.
> > On Bash prompt, type: echo 'a TAB b' RET

Sorry, I forgot C-v: i.e., type: echo 'a C-v TAB b' RET

> > Bash prints: "a	b" (a TAB b), and displays new prompt.
>
> I cannot reproduce this because when I press TAB, I get a bell,
> i.e. TAB is not printed.  Which is consistent with what TAB produces
> outside Emacs, when I type it at Bash prompt: Bash attempts to perform
> completion on what I typed.

Message #14 received at 73951 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Toomas Rosin <toomas <at> rosin.ee>
Cc: 73951 <at> debbugs.gnu.org
Subject: Re: bug#73951: 29.4;
 'what-cursor-position' reports SPC instead of TAB in term-mode
Date: Wed, 23 Oct 2024 20:47:17 +0300

> From: Toomas Rosin <toomas <at> rosin.ee>
> cc: 73951 <at> debbugs.gnu.org
> Comments: In-reply-to Eli Zaretskii <eliz <at> gnu.org>
>    message dated "Tue, 22 Oct 2024 20:40:57 +0300."
> Date: Wed, 23 Oct 2024 17:00:08 +0300
> 
> Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
> > > Start: emacs -Q
> > > Type: M-x term RET
> > > On Emacs prompt "Run program: /bin/bash", type: RET
> > > The *terminal* buffer appears.
> > > On Bash prompt, type: echo 'a TAB b' RET
> 
> Sorry, I forgot C-v: i.e., type: echo 'a C-v TAB b' RET

OK, so why is it a problem that Emacs uses SPC character to emulate a
TAB?

Message #17 received at 73951 <at> debbugs.gnu.org (full text, mbox):

From: Toomas Rosin <toomas <at> rosin.ee>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 73951 <at> debbugs.gnu.org
Subject: Re: bug#73951: 29.4;
 'what-cursor-position' reports SPC instead of TAB in term-mode
Date: Sun, 03 Nov 2024 17:50:37 +0200

Eli Zaretskii <eliz <at> gnu.org> wrote:

> OK, so why is it a problem that Emacs uses SPC character to emulate a
> TAB?

It is confusing when you don't happen to know about it.

I did not know about it before writing the OP.  I had this function definition in a shell script (where "<TAB>" denotes the tab character):

    tawk () { awk -F '<TAB>' -v OFS='<TAB>' "$@"; }  # run awk on tab delimited files

When I yanked this definition from the script to the "*terminal*" buffer and tried to use it, I happened to get unexpected results (which, as it turned out later, were in fact not connected to this definition), and the first thing I suspected was (quite naturally imho) that something was wrong with the tab characters in the definition of the function.  To check the definition, I ran "type tawk" in the *terminal* buffer, switched to line mode (C-c C-j), moved the cursor to the tab chars, ran `what-cursor-position' — and indeed, it told me that there were spaces there instead of tabs!  So I was confirmed in my barking up the wrong tree.

Message #20 received at 73951 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Toomas Rosin <toomas <at> rosin.ee>
Cc: 73951 <at> debbugs.gnu.org
Subject: Re: bug#73951: 29.4;
 'what-cursor-position' reports SPC instead of TAB in term-mode
Date: Sun, 03 Nov 2024 18:39:13 +0200

> From: Toomas Rosin <toomas <at> rosin.ee>
> cc: 73951 <at> debbugs.gnu.org
> Comments: In-reply-to Eli Zaretskii <eliz <at> gnu.org>
>    message dated "Wed, 23 Oct 2024 20:47:17 +0300."
> Date: Sun, 03 Nov 2024 17:50:37 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
> > OK, so why is it a problem that Emacs uses SPC character to emulate a
> > TAB?
> 
> It is confusing when you don't happen to know about it.
> 
> I did not know about it before writing the OP.  I had this function definition in a shell script (where "<TAB>" denotes the tab character):
> 
>     tawk () { awk -F '<TAB>' -v OFS='<TAB>' "$@"; }  # run awk on tab delimited files
> 
> When I yanked this definition from the script to the "*terminal*" buffer and tried to use it, I happened to get unexpected results (which, as it turned out later, were in fact not connected to this definition), and the first thing I suspected was (quite naturally imho) that something was wrong with the tab characters in the definition of the function.  To check the definition, I ran "type tawk" in the *terminal* buffer, switched to line mode (C-c C-j), moved the cursor to the tab chars, ran `what-cursor-position' — and indeed, it told me that there were spaces there instead of tabs!  So I was confirmed in my barking up the wrong tree.

Did you try setting indent-tabs-mode to a non-nil value?

Message #23 received at 73951 <at> debbugs.gnu.org (full text, mbox):

From: Toomas Rosin <toomas <at> rosin.ee>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 73951 <at> debbugs.gnu.org
Subject: Re: bug#73951: 29.4;
 'what-cursor-position' reports SPC instead of TAB in term-mode
Date: Mon, 04 Nov 2024 21:37:26 +0200

Eli Zaretskii <eliz <at> gnu.org> wrote:

> Did you try setting indent-tabs-mode to a non-nil value?

How could I not have thought of this!  But yes, when I set `indent-tabs-mode' to `t' *before* pasting the function definition, and then run "type tawk" in terminal buffer and move point in line mode onto the tab character, `C-x =' says correctly that point is on TAB.

I had `indent-tabs-mode' set to `nil' globally in my init.el; now I see that it is a good idea to leave `indent-tabs-mode' to `t' in terminal mode.

I have no more questions.  Thank you.

T.

Message #28 received at 73951-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Toomas Rosin <toomas <at> rosin.ee>
Cc: 73951-done <at> debbugs.gnu.org
Subject: Re: bug#73951: 29.4;
 'what-cursor-position' reports SPC instead of TAB in term-mode
Date: Mon, 04 Nov 2024 21:52:36 +0200

> From: Toomas Rosin <toomas <at> rosin.ee>
> cc: 73951 <at> debbugs.gnu.org
> Comments: In-reply-to Eli Zaretskii <eliz <at> gnu.org>
>    message dated "Sun, 03 Nov 2024 18:39:13 +0200."
> Date: Mon, 04 Nov 2024 21:37:26 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
> > Did you try setting indent-tabs-mode to a non-nil value?
> 
> How could I not have thought of this!  But yes, when I set `indent-tabs-mode' to `t' *before* pasting the function definition, and then run "type tawk" in terminal buffer and move point in line mode onto the tab character, `C-x =' says correctly that point is on TAB.
> 
> I had `indent-tabs-mode' set to `nil' globally in my init.el; now I see that it is a good idea to leave `indent-tabs-mode' to `t' in terminal mode.

"M-x term" intentionally resets indent-tabs-mode to nil, with this
comment:

    ;; we do not want indent to sneak in any tabs

So if setting indent-tabs-mode non-nil suits you better, try to be on
the lookout for whatever problems the above comment might hint at; I
don't really understand what it wants to say (but then I don't use
"M-x term").

> I have no more questions.  Thank you.

Thanks, I will therefore close this bug.

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