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 ...

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  $ hg init debugrevlog

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  $ cd debugrevlog

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  $ echo a > a

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  $ hg ci -Am adda

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  adding a

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  $ hg debugrevlog -m

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  format : 1

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  flags  : inline

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  revisions     :  1

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      merges    :  0 ( 0.00%)

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      normal    :  1 (100.00%)

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  revisions     :  1

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      full      :  1 (100.00%)

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      deltas    :  0 ( 0.00%)

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  revision size : 44

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      full      : 44 (100.00%)

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      deltas    :  0 ( 0.00%)

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  avg chain length  : 0

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  compression ratio : 0

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  uncompressed data size (min/max/avg) : 43 / 43 / 43

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  full revision size (min/max/avg)     : 44 / 44 / 44

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  delta size (min/max/avg)             : 0 / 0 / 0

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Test internal debugstacktrace command

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  $ cat > debugstacktrace.py << EOF

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  > from mercurial.util import debugstacktrace, dst, sys

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  > def f():

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  >     dst('hello world')

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  > def g():

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  >     f()

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  >     debugstacktrace(skip=-5, f=sys.stdout)

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  > g()

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  > EOF

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  $ python debugstacktrace.py

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  hello world at:

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   debugstacktrace.py:7 in <module>

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   debugstacktrace.py:5 in g

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   debugstacktrace.py:3 in f

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  stacktrace at:

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   debugstacktrace.py:7 *in <module> (glob)

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   debugstacktrace.py:6 *in g (glob)

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   */util.py:* in debugstacktrace (glob)