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Subject: bug#7461: 23.2; Gdb only does tab completion inside Emacs when prompt is (gdb)
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Date: Sun, 21 Nov 2010 17:45:14 +0000
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When running gdb inside emacs, either by doing M-x gdb or M-x gud-gdb,
if the prompt is set to something that isn't "(gdb)" (or similar, see
the examples below), pressing TAB doesn't do the completion of
commands, functions or variables.

Use the following steps to reproduce the error using emacs -Q:

1) Create a new C file, for example code.c, with the following
contents:

#include <stdio.h>

int main(void) {
	printf("Hello World\n");
	return 0;
}

2) Compile code using gcc -g code.c -o code

3) Open emacs -Q

4) Start debugging the file using M-x gdb

5) Prompt should be "(gdb) ". Try to type "b ma" and press TAB. It
should expand to "b main".

6) Change gdb's prompt to something else using "set prompt". I changed
it to "gdb> ".

7) Try to type "b ma" and press TAB. It should display on the
minibuffer the message "No completions of ma".


Prompts I've tried where TAB completion still worked:

* "(gdb)"
* "        (gdb)        " (the prefix whitespace is discarded by gdb,
  so this is the same as "(gdb)        ")
* "( gdb) "
* "(gdb)_______________________"
* "(GDB) "
* "( GDB) "

Prompts I've tried where TAB completion DIDN'T work:

* "(gdb )"
* "_(gdb)"
* "(gdb "
* "gdb) "
* "( gdb )"
* "" (removed prompt by typing "set prompt" in gdb)
* "gdb> "
* "gdb>"
* "gdb "
* "gdb"
* "<gdb "
* "<gdb"

Emacs version is: GNU Emacs 23.2.1 (i686-pc-linux-gnu, GTK+ Version
2.16.1)

GDB version is: GNU gdb (GDB) 7.2

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Rolando Pereira <finalyugi@HIDDEN>
Subject: bug#7461: Acknowledgement (23.2; Gdb only does tab completion
 inside Emacs when prompt is (gdb))
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References: <20101121174502.GA14674@rolando-laptop>
X-Gnu-PR-Message: ack 7461
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Reply-To: 7461 <at> debbugs.gnu.org
Date: Sun, 21 Nov 2010 19:23:01 +0000

Thank you for filing a new bug report with GNU.

This is an automatically generated reply to let you know your message
has been received.

Your message is being forwarded to the package maintainers and other
interested parties for their attention; they will reply in due course.

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If you wish to submit further information on this problem, please
send it to 7461 <at> debbugs.gnu.org.

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--=20
7461: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D7461
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

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Subject: bug#7461: 23.2; Gdb only does tab completion inside Emacs when prompt is (gdb)
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Rolando Pereira wrote:

> When running gdb inside emacs, either by doing M-x gdb or M-x gud-gdb,
> if the prompt is set to something that isn't "(gdb)" (or similar, see
> the examples below), pressing TAB doesn't do the completion of
> commands, functions or variables.

Thank you for the complete example.

It looks like, after you have changed the prompt, you can set the
local value of comint-prompt-regexp to match it.

More generally, when comint-use-prompt-regexp is nil (which it is by
default), gud.el probably ought not to try and use comint-prompt-regexp.
Instead it should use whatever field properties comint adds.

> Emacs version is: GNU Emacs 23.2.1 (i686-pc-linux-gnu, GTK+ Version
> 2.16.1)
>
> GDB version is: GNU gdb (GDB) 7.2

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tags 7461 notabug
thanks

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Subject: bug#7461: 23.2; gud.el always uses comint-prompt-regexp; things can break if prompt is changed
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 Content preview: Glenn Morris <rgm@HIDDEN> writes: >> When running gdb inside
 emacs, either by doing M-x gdb or M-x gud-gdb, >> if the prompt is set to
 something that isn't "(gdb)" (or similar, see >> the examples below), pressing
 TAB doesn't do the c [...] 
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Glenn Morris <rgm@HIDDEN> writes:

>> When running gdb inside emacs, either by doing M-x gdb or M-x gud-gdb,
>> if the prompt is set to something that isn't "(gdb)" (or similar, see
>> the examples below), pressing TAB doesn't do the completion of
>> commands, functions or variables.
>
> Thank you for the complete example.
>
> It looks like, after you have changed the prompt, you can set the
> local value of comint-prompt-regexp to match it.
>
> More generally, when comint-use-prompt-regexp is nil (which it is by
> default), gud.el probably ought not to try and use comint-prompt-regexp.
> Instead it should use whatever field properties comint adds.

(I'm going through old bug reports that unfortunately weren't
resolved at the time.)

Looking at the gud code, that sounds like a good idea --- but
unfortunately comint doesn't put any specific field property on the
prompt.  Instead it seems like it marks all the data output, including
the prompt, as `output'.  Which makes sense, but doesn't help us with
distinguishing whether the line we're at is a prompt.

I think.

And I don't think we can change the fields here, because I'm guessing a
lot of stuff depends on all the output being the same field.

But comint does indeed know that it's a prompt...  so we could add
another property here -- like `comint-prompt' on the prompts, and then
use that.

Anybody have any other ideas here?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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