[PATCH v2] dispatch: refactor tortured debugger setup logic
Bryan O'Sullivan
bos at serpentine.com
Fri Jan 1 22:46:23 UTC 2016
# HG changeset patch
# User Bryan O'Sullivan <bos at serpentine.com>
# Date 1451688323 28800
# Fri Jan 01 14:45:23 2016 -0800
# Node ID f019056c88a34d9cf9d01e10f1354e049ce07521
# Parent 44f717c879033f28d3f7e7dc9f34aa394d2fea3f
dispatch: refactor tortured debugger setup logic
This patch was triggered by observing that the pdb debugger was
always loaded regardless of whether a debugger was to be used.
The logic as it existed was a thicket of accidental complexity.
It's now much easier to follow (and only loads a debugger if needed).
diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
--- a/mercurial/dispatch.py
+++ b/mercurial/dispatch.py
@@ -137,14 +137,6 @@ def _runcatch(req):
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))
@@ -155,13 +147,13 @@ def _runcatch(req):
for sec, name, val in cfgs:
req.repo.ui.setconfig(sec, name, val, source='--config')
- # developer config: ui.debugger
- debugger = ui.config("ui", "debugger")
- debugmod = pdb
- if not debugger or ui.plain():
- # if we are in HGPLAIN mode, then disable custom debugging
+ if '--debugger' in req.args:
+ # if we are in HGPLAIN mode, ignore custom debugging
debugger = 'pdb'
- elif '--debugger' in req.args:
+ if not ui.plain():
+ # developer config: ui.debugger
+ debugger = ui.config('ui', 'debugger', default='pdb')
+
# This import can be slow for fancy debuggers, so only
# do it when absolutely necessary, i.e. when actual
# debugging has been requested
@@ -169,22 +161,15 @@ def _runcatch(req):
try:
debugmod = __import__(debugger)
except ImportError:
- pass # Leave debugmod = pdb
+ ui.warn(_("%s debugger specified "
+ "but its module was not found\n") % debugger)
+ debugmod = pdb
- debugtrace[debugger] = debugmod.set_trace
- debugmortem[debugger] = debugmod.post_mortem
+ # enter the debugger before command execution
+ ui.warn(_("entering debugger - "
+ "type c to continue starting hg or h for help\n"))
- # 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"))
-
- if (debugger != 'pdb' and
- debugtrace[debugger] == debugtrace['pdb']):
- ui.warn(_("%s debugger specified "
- "but its module was not found\n") % debugger)
- with demandimport.deactivated():
- debugtrace[debugger]()
+ debugmod.set_trace()
try:
return _dispatch(req)
finally:
@@ -193,7 +178,7 @@ def _runcatch(req):
# enter the debugger when we hit an exception
if '--debugger' in req.args:
traceback.print_exc()
- debugmortem[debugger](sys.exc_info()[2])
+ debugmod.post_mortem(sys.exc_info()[2])
ui.traceback()
raise
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