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doc: use an absolute path in sys.path to work around a python DLL loading bug...

doc: use an absolute path in sys.path to work around a python DLL loading bug This bug[1] was causing the zstd entry under "Available Compression Engines" to be omitted from the documentation for some versions of python3. I could upgrade, but past upgrades have broken venvs and clobbered installed packages. It's a trivial workaround, so there's no sense in leaving this subtle issue. It was flushed out by changing the module policy here from 'allow' to 'c', and seeing this error: ImportError: DLL load failed while importing parsers: The parameter is incorrect. [1] https://github.com/python/cpython/issues/87271 Differential Revision: https://phab.mercurial-scm.org/D12599

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      '''

      Examples of useful python hooks for Mercurial.

      '''

      from __future__ import absolute_import

      from mercurial import (

          patch,

          util,

      )

      def diffstat(ui, repo, **kwargs):

          """Example usage:

          [hooks]

          commit.diffstat = python:/path/to/this/file.py:diffstat

          changegroup.diffstat = python:/path/to/this/file.py:diffstat

          """

          if kwargs.get('parent2'):

              return

          node = kwargs['node']

          first = repo[node].p1().node()

          if 'url' in kwargs:

              last = repo.changelog.tip()

          else:

              last = node

          diff = patch.diff(repo, first, last)

          ui.write(patch.diffstat(util.iterlines(diff)))

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

				'''
				Examples of useful python hooks for Mercurial.
				'''
				from __future__ import absolute_import
				from mercurial import (
				patch,
				util,
				)


				def diffstat(ui, repo, **kwargs):
				"""Example usage:

				[hooks]
				commit.diffstat = python:/path/to/this/file.py:diffstat
				changegroup.diffstat = python:/path/to/this/file.py:diffstat
				"""
				if kwargs.get('parent2'):
				return
				node = kwargs['node']
				first = repo[node].p1().node()
				if 'url' in kwargs:
				last = repo.changelog.tip()
				else:
				last = node
				diff = patch.diff(repo, first, last)
				ui.write(patch.diffstat(util.iterlines(diff)))