Mercurial > public > mercurial-scm > hg-stable
diff mercurial/util.py @ 20244:47d0843647d1
util: introduce util.debugstacktrace for showing a stack trace without crashing
This is often very handy when hacking/debugging.
Calling util.debugstacktrace('hey') from a place in hg will give something like:
hey at:
./hg:38 in <module>
/home/user/hgsrc/mercurial/dispatch.py:28 in run
/home/user/hgsrc/mercurial/dispatch.py:65 in dispatch
/home/user/hgsrc/mercurial/dispatch.py:88 in _runcatch
/home/user/hgsrc/mercurial/dispatch.py:740 in _dispatch
/home/user/hgsrc/mercurial/dispatch.py:514 in runcommand
/home/user/hgsrc/mercurial/dispatch.py:830 in _runcommand
/home/user/hgsrc/mercurial/dispatch.py:801 in checkargs
/home/user/hgsrc/mercurial/dispatch.py:737 in <lambda>
/home/user/hgsrc/mercurial/util.py:472 in check
...
| author | Mads Kiilerich <madski@unity3d.com> |
|---|---|
| date | Sun, 12 Jan 2014 23:28:21 +0100 |
| parents | a6014018ec28 |
| children | 0889585b44f1 |
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--- a/mercurial/util.py Tue Jan 07 22:29:57 2014 +0100 +++ b/mercurial/util.py Sun Jan 12 23:28:21 2014 +0100 @@ -1983,3 +1983,20 @@ self._hooks.sort(key=lambda x: x[0]) for source, hook in self._hooks: hook(*args) + +def debugstacktrace(msg='stacktrace', skip=0, f=sys.stderr): + '''Writes a message to f (stderr) with a nicely formatted stacktrace. + Skips the 'skip' last entries. + It can be used everywhere and do intentionally not require an ui object. + Not be used in production code but very convenient while developing. + ''' + f.write('%s at:\n' % msg) + entries = [('%s:%s' % (fn, ln), func) + for fn, ln, func, _text in traceback.extract_stack()[:-skip - 1]] + if entries: + fnmax = max(len(entry[0]) for entry in entries) + for fnln, func in entries: + f.write(' %-*s in %s\n' % (fnmax, fnln, func)) + +# convenient shortcut +dst = debugstacktrace