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Viewing changes to bzrlib/branch.py

Add pre_change_branch_tip hook. (Andrew Bennetts)

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bzrlib/branch.py
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        # local is the local branch or None, master is the target branch,
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        # and an empty branch recieves new_revno of 0, new_revid of None.
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        self['post_uncommit'] = []
 
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        # Introduced in 1.6
 
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        # Invoked before the tip of a branch changes.
 
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        # the api signature is
 
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        # (params) where params is a ChangeBranchTipParams with the members
 
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        # (branch, old_revno, new_revno, old_revid, new_revid)
 
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        self['pre_change_branch_tip'] = []
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        # Introduced in 1.4
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        # Invoked after the tip of a branch changes.
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        # the api signature is
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        self.old_revid = old_revid
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        self.new_revid = new_revid
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    def __eq__(self, other):
 
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        return self.__dict__ == other.__dict__
 
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    def __repr__(self):
 
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        return "<%s of %s from (%s, %s) to (%s, %s)>" % (
 
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            self.__class__.__name__, self.branch, 
 
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            self.old_revno, self.old_revid, self.new_revno, self.new_revid)
 
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class BzrBranchFormat4(BranchFormat):
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    """Bzr branch format 4.
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        for hook in Branch.hooks['set_rh']:
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            hook(self, rev_history)
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    def _run_pre_change_branch_tip_hooks(self, new_revno, new_revid):
 
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        """Run the pre_change_branch_tip hooks."""
 
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        hooks = Branch.hooks['pre_change_branch_tip']
 
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        if not hooks:
 
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            return
 
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        old_revno, old_revid = self.last_revision_info()
 
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        params = ChangeBranchTipParams(
 
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            self, old_revno, new_revno, old_revid, new_revid)
 
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        for hook in hooks:
 
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            hook(params)
 
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    def _run_post_change_branch_tip_hooks(self, old_revno, old_revid):
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        """Run the post_change_branch_tip hooks."""
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        hooks = Branch.hooks['post_change_branch_tip']
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        history = self._lefthand_history(revision_id)
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        if len(history) != revno:
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            raise AssertionError('%d != %d' % (len(history), revno))
 
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        self._run_pre_change_branch_tip_hooks(revno, revision_id)
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        self.set_revision_history(history)
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        self._run_post_change_branch_tip_hooks(old_revno, old_revid)
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        old_revno, old_revid = self.last_revision_info()
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        if self._get_append_revisions_only():
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            self._check_history_violation(revision_id)
 
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        self._run_pre_change_branch_tip_hooks(revno, revision_id)
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        self._write_last_revision_info(revno, revision_id)
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        self._clear_cached_state()
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        self._last_revision_info_cache = revno, revision_id