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Subject: bug#18294: 24.3; gud and/or gdb: Add hooks to detect when a source file is visited during debugging
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Hello,

I am writing a minor mode to control the debugger from a source buffer
by pressing single-letter keystrokes, e.g. "n" for gud-next, etc. The
mode itself is very simple =E2=80=94 it has a keymap, and it sets the buffe=
r
read-only while it is active so as to free these keys from their usual
'self-insert-command' bindings.

I need to be able to enable this mode for the same buffers where gdb
allows clicking in the fringe to set a breakpoint, and at the same
time as gdb sets up reaction to these clicks. For that purpose, I
currently advise the 'gdb-init-buffer' function.

Additionally, I need to detect when debugging is finished, in order to
disable the mode in all buffers, so that the user would be able to
edit files again. Currently, I advise 'gdb-reset' and loop over all
buffers, disabling the mode.

It would be nice if gdb-mi.el provided hooks that I could add to
instead of advising gdb functions.


Implementation proposal:

* Add a normal hook 'gdb-init-buffer-hook' that runs at the end of
'gdb-init-buffer' with the buffer being initialized still current.
* Add a normal hook 'gdb-reset-hook' that runs at the end of 'gdb-reset'.


Additional considerations:

The mode I am writing might be useful for Gud backends other than
gdbmi. To generalize to those, I would need the following hooks:

* A hook that can be used to enable the mode. It needs to run at the
start of a debugging session, once for each existing buffer visiting a
source file of the program being debugged, with that buffer being
current. Additionally, it needs to run when a new buffer is opened
while debugging, iff that buffer is visiting a source file of the
program being debugged.

* A hook that can be used to disable the mode. It needs to run once
when a debugging session ends. Alternatively, a hook that runs once
for each buffer in which the above hook has previously ran.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7)
 of 2014-03-08 on lamiak, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:    Ubuntu 14.04.1 LTS

Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
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 '--mandir=3D/usr/share/man' '--with-pop=3Dyes'
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isp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=3D/usr/lib/x86_64-linux-gnu' '--with-x=3Dyes'
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 --param=3Dssp-buffer-size=3D4 -Wformat -Werror=3Dformat-security -Wall'
 'LDFLAGS=3D-Wl,-Bsymbolic-functions -Wl,-z,relro'
 'CPPFLAGS=3D-D_FORTIFY_SOURCE=3D2''

Important settings:
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  value of $LC_NUMERIC: en_US.UTF-8
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Major mode: Emacs-Lisp

Minor modes in effect:
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Recent input:
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<left> <left> <down> <left> <left> <left> <left> <left>
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<C-down> <C-down> <C-down> <C-down> <C-down> <C-down>
<C-down> <C-down> <C-down> <C-down> <C-down> <C-down>
<C-down> <C-down> <C-down> <C-down> <f1> v g u d -
m i n o r - m o d e - h <tab> o o k <return> C-g <M-left>
M-x r e p o r <tab> <return>

Recent messages:
Mark saved where search started
Mark set
Mark saved where search started [2 times]
Quit
Type "q" to restore previous buffer, <next> to scroll help.
byte-code: Beginning of buffer [3 times]
mouse-2, RET: find variable's definition
uncompressing gud.el.gz...done
Note: file is write protected
Here is not Git work tree [2 times]
Quit [2 times]

Load-path shadows:
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/usr/share/emacs24/site-lisp/emacs-goodies-el/browse-kill-ring
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Yuri Khan <yuri.v.khan@HIDDEN>
Subject: bug#18294: Acknowledgement (24.3; gud and/or gdb: Add hooks to
 detect when a source file is visited during debugging)
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#18294: 24.3; gud and/or gdb: Add hooks to detect when a source file is visited during debugging
Resent-From: martin rudalics <rudalics@HIDDEN>
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Date: Thu, 21 Aug 2014 11:24:27 +0200
From: martin rudalics <rudalics@HIDDEN>
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 > I am writing a minor mode to control the debugger from a source buffer=

 > by pressing single-letter keystrokes, e.g. "n" for gud-next, etc. The
 > mode itself is very simple =E2=80=94 it has a keymap, and it sets the =
buffer
 > read-only while it is active so as to free these keys from their usual=

 > 'self-insert-command' bindings.
[...]
 > It would be nice if gdb-mi.el provided hooks that I could add to
 > instead of advising gdb functions.

I'd like such a thing.  But wouldn't it be easier to do this right in
gdb-mi.el?  All I'd need is a simple key combination to toggle this
behavior off whenever I want to modify code on the fly.  The next "run"
would then turn the behavior on again.

martin

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#18294: 24.3; gud and/or gdb: Add hooks to detect when a source file is visited during debugging
Resent-From: Yuri Khan <yuri.v.khan@HIDDEN>
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Date: Sun, 24 Aug 2014 17:32:58 +0700
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On Thu, Aug 21, 2014 at 4:24 PM, martin rudalics <rudalics@HIDDEN> wrote:
>
> I'd like such a thing.  But wouldn't it be easier to do this right in
> gdb-mi.el?  All I'd need is a simple key combination to toggle this
> behavior off whenever I want to modify code on the fly.  The next "run"
> would then turn the behavior on again.

=E2=80=9CThis behavior=E2=80=9D consists of two changes to the current stat=
e (which
allows editing while debugging):

* binding additional keys, and
* locking source files to be read-only,

and these changes need to be done simultaneously.

This may be achieved several ways, one of them being a minor mode,
which I am suggesting here.

Other ways include:

* Binding keys directly in the gud-minor-mode-map, along with fringe
clicks. This way, each such binding will have to check for a flag
(which may or may not be the read-only flag), and invoke either the
appropriate debugger command or self-insert-command.

* Binding keys globally, then checking if the debugger is active, in
addition to the above.

In my opinion, a separate minor mode is much cleaner than any of the
latter options.

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 > =E2=80=9CThis behavior=E2=80=9D consists of two changes to the current=
 state (which
 > allows editing while debugging):
 >
 > * binding additional keys, and
 > * locking source files to be read-only,
 >
 > and these changes need to be done simultaneously.
 >
 > This may be achieved several ways, one of them being a minor mode,
 > which I am suggesting here.
[...]
 > In my opinion, a separate minor mode is much cleaner than any of the
 > latter options.

Agreed.  I was only objecting to the idea that one could turn that mode
off only by quitting the debugger, that is by typing `quit' in gud-mode.

martin

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