bug#30208: M-x pdb breaks if certain characters are in the file's path

bug#30208: M-x pdb breaks if certain characters are in the file's path

[Robin Allen]

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"M-x pdb" breaks if the path to the file being debugged includes certain characters.

CONFIGURATION
GNU Emacs 25.3.1
Happens with default settings (no init file)

STEPS TO REPRODUCE
M-x pdb
Run pdb (like this): python3 -m pdb test.py

WHAT SHOULD HAPPEN
A *gud-pdb* buffer should open, display the PDB prompt, and accept debugger commands.

WHAT ACTUALLY HAPPENS
A *gud-pdb* buffer opens, with output: "Current directory is /home/me@mycompany.local/" and nothing else. Commands sent to the debugger do seem to work, but the prompt and debugger output is not displayed. After sending many commands, all the previous prompts and outputs may appear in one big lump, as if this were a buffering issue (though I don't think it is).

WORKAROUND
This is caused by GUD choking on the @ character in the file path. I worked around it by putting this in .emacs:
(setq gud-pdb-marker-regexp
  "^> \\([-a-zA-Z0-9_/.:\\@ ]*\\|<string>\\)(\\([0-9]+\\))\\([a-zA-Z0-9_]*\\|\\?\\|<module>\\)()\\(->[^\n\r]*\\)?[\n\r]")

This is the default value, with @ (and space, for good measure) inserted in the first group.

SUGGESTED FIX
Update the default value of gud-gdb-marker-regexp

I hope this is useful

Robin

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bug#30208: M-x pdb breaks if certain characters are in the file's path

[Eli Zaretskii]

> From: Robin Allen <Robin.Allen@artsalliancemedia.com>
> Date: Mon, 22 Jan 2018 11:35:09 +0000
> 
> WORKAROUND
> This is caused by GUD choking on the @ character in the file path. I worked around it by putting this in .emacs:
> (setq gud-pdb-marker-regexp
>   "^> \\([-a-zA-Z0-9_/.:\\@ ]*\\|<string>\\)(\\([0-9]+\\))\\([a-zA-Z0-9_]*\\|\\?\\|<module>\\)()\\(->[^\n\r]*\\)?[\n\r]")
> 
> This is the default value, with @ (and space, for good measure) inserted in the first group.

Thanks, I made that change.  But why did you need to escape the @
character?  It isn't a special character in Emacs regular expressions,
AFAIK.

bug#30208: M-x pdb breaks if certain characters are in the file's path

[Andreas Schwab]

On Jan 26 2018, Eli Zaretskii <eliz@gnu.org> wrote:

>> From: Robin Allen <Robin.Allen@artsalliancemedia.com>
>> Date: Mon, 22 Jan 2018 11:35:09 +0000
>> 
>> WORKAROUND
>> This is caused by GUD choking on the @ character in the file path. I worked around it by putting this in .emacs:
>> (setq gud-pdb-marker-regexp
>>   "^> \\([-a-zA-Z0-9_/.:\\@ ]*\\|<string>\\)(\\([0-9]+\\))\\([a-zA-Z0-9_]*\\|\\?\\|<module>\\)()\\(->[^\n\r]*\\)?[\n\r]")
>> 
>> This is the default value, with @ (and space, for good measure) inserted in the first group.
>
> Thanks, I made that change.  But why did you need to escape the @
> character?  It isn't a special character in Emacs regular expressions,
> AFAIK.

@ isn't escaped, it just happends to follow \ in the set of characters.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#30208: M-x pdb breaks if certain characters are in the file's path

[Eli Zaretskii]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: eliz@gnu.org,  Robin.Allen@artsalliancemedia.com
> Date: Fri, 26 Jan 2018 17:35:48 +0100
> 
> >>   "^> \\([-a-zA-Z0-9_/.:\\@ ]*\\|<string>\\)(\\([0-9]+\\))\\([a-zA-Z0-9_]*\\|\\?\\|<module>\\)()\\(->[^\n\r]*\\)?[\n\r]")
> >> 
> >> This is the default value, with @ (and space, for good measure) inserted in the first group.
> >
> > Thanks, I made that change.  But why did you need to escape the @
> > character?  It isn't a special character in Emacs regular expressions,
> > AFAIK.
> 
> @ isn't escaped, it just happends to follow \ in the set of characters.

Right.