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Viewing changes to doc/en/user-guide/hooks.txt

  • Committer: Andrew Bennetts
  • Date: 2010-04-14 06:47:18 UTC
  • mto: This revision was merged to the branch mainline in revision 5155.
  • Revision ID: andrew.bennetts@canonical.com-20100414064718-130ptdug4opfjj6b
Link to Python bug in comment.

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doc/en/user-guide/hooks.txt
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Debugging hooks
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---------------
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To get a list of installed hooks (and available hook points), use the hidden
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``hooks`` command::
 
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To get a list of installed hooks, use the hidden ``hooks`` command::
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    bzr hooks
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Example: a merge plugin
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-----------------------
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Here's a complete plugin that demonstrates the ``Merger.merge_file_content``
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hook.  It installs a hook that forces any merge of a file named ``*.xml``
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to be a conflict, even if Bazaar thinks it can merge it cleanly.
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``merge_xml.py``::
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  """Custom 'merge' logic for *.xml files.
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  Always conflicts if both branches have changed the file.
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  """
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  from bzrlib.merge import PerFileMerger, Merger
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  def merge_xml_files_hook(merger):
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      """Hook to merge *.xml files"""
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      return AlwaysConflictXMLMerger(merger)
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  class AlwaysConflictXMLMerger(PerFileMerger):
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      def file_matches(self, params):
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          filename = self.get_filename(params, self.merger.this_tree)
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          return filename.endswith('.xml')
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      def merge_matching(self, params):
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          return 'conflicted', params.this_lines
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  Merger.hooks.install_named_hook(
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      'merge_file_content', merge_xml_files_hook, '*.xml file merge')
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``merge_file_content`` hooks are executed for each file to be merged.  For
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a more a complex example look at the ``news_merge`` plugin that's bundled with
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Bazaar in the ``bzrlib/plugins`` directory.
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