[PATCH 2 of 2] dispatch: add ability to specify a custom pdb module as a debugger

Augie Fackler raf at durin42.com
Wed Aug 7 13:22:41 CDT 2013


On Wed, Aug 07, 2013 at 01:10:17PM -0500, Sean Farley wrote:
> # HG changeset patch
> # User Sean Farley <sean.michael.farley at gmail.com>
> # Date 1374809314 18000
> #      Thu Jul 25 22:28:34 2013 -0500
> # Node ID 2bd946fe541c6c6a95b79fce2c17cce92a791a98
> # Parent  5f4deef41fd1f5cee36d06e7b9422a87abf4664e
> dispatch: add ability to specify a custom pdb module as a debugger

Series LGTM at a high level, want someone else to review because
dispatch gives me the willies.

>
> This adds the ability to specify a config option, ui.debugger, to a custom pdb
> module, such as ipdb, and have mercurial use that as its debugger. As long as
> the value of ui.debugger is a loadable module with the set_trace and
> post_mortem functions, then dispatch will be able to use the custom module.
>
> Debugging _parseconfig is still available in the case of an error since it will
> be caught with a default the value of pdb.post_mortem.
>
> diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
> --- a/mercurial/dispatch.py
> +++ b/mercurial/dispatch.py
> @@ -86,10 +86,17 @@
>      except ValueError:
>          pass # happens if called in a thread
>
>      try:
>          try:
> +            debugger = 'pdb'
> +            debugtrace = {
> +                'pdb' : pdb.set_trace
> +            }
> +            debugmortem = {
> +                'pdb' : pdb.post_mortem
> +            }
>
>              # read --config before doing anything else
>              # (e.g. to change trust settings for reading .hg/hgrc)
>              cfgs = _parseconfig(req.ui, _earlygetopt(['--config'], req.args))
>
> @@ -97,24 +104,42 @@
>                  # copy configs that were passed on the cmdline (--config) to
>                  # the repo ui
>                  for cfg in cfgs:
>                      req.repo.ui.setconfig(*cfg)
>
> +            debugger = ui.config("ui", "debugger")
> +            if not debugger:
> +                debugger = 'pdb'
> +
> +            try:
> +                debugmod = __import__(debugger)
> +            except ImportError:
> +                debugmod = pdb
> +
> +            debugtrace[debugger] = debugmod.set_trace
> +            debugmortem[debugger] = debugmod.post_mortem
> +
>              # enter the debugger before command execution
>              if '--debugger' in req.args:
>                  ui.warn(_("entering debugger - "
>                          "type c to continue starting hg or h for help\n"))
> -                pdb.set_trace()
> +
> +                if (debugger != 'pdb' and
> +                    debugtrace[debugger] == debugtrace['pdb']):
> +                    ui.warn(_("%s debugger specified "
> +                              "but its module was not found\n") % debugger)
> +
> +                debugtrace[debugger]()
>              try:
>                  return _dispatch(req)
>              finally:
>                  ui.flush()
>          except: # re-raises
>              # enter the debugger when we hit an exception
>              if '--debugger' in req.args:
>                  traceback.print_exc()
> -                pdb.post_mortem(sys.exc_info()[2])
> +                debugmortem[debugger](sys.exc_info()[2])
>              ui.traceback()
>              raise
>
>      # Global exception handling, alphabetically
>      # Mercurial-specific first, followed by built-in and library exceptions
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