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/usr/share/doc/trac-mercurial/README.Debian is in trac-mercurial 1.0.0.3+hg8df754d9b36a-1.

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The upstream README file has some information pertaining to other
versions of TracMercurial.  To enable it for this release, all you need
to do is put the following snippet in your trac.ini:

  [components]
  tracext.hg.* = enabled

In the [trac] section, you also need

  [trac]
  repository_type = hg
  repository_dir = /path/to/my/hg/repository

(add those lines to the existing [trac] section rather than creating a
new one).  There are some Mercurial specific settings you can add as
well:

  [hg]
  # -- Show revision number in addition to the changeset hash
  show_rev = yes
  
  # -- Changeset hash format
  node_format = short
  # hex:   Show the full SHA1 hash 
  # short: Show a shortened hash for the changesets