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from i18n import _
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from mercurial import util
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def tolist(val):
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"""
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a convenience method to return an empty list instead of None
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"""
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if val is None:
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return []
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else:
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return [val]
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class namespaces(object):
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"""
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provides an interface to register a generic many-to-many mapping between
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some (namespaced) names and nodes. The goal here is to control the
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pollution of jamming things into tags or bookmarks (in extension-land) and
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to simplify internal bits of mercurial: log output, tab completion, etc.
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More precisely, we define a list of names (the namespace) and a mapping of
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names to nodes. This name mapping returns a list of nodes.
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Furthermore, each name mapping will be passed a name to lookup which might
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not be in its domain. In this case, each method should return an empty list
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and not raise an error.
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We'll have a dictionary '_names' where each key is a namespace and
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its value is a dictionary of functions:
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'namemap': function that takes a name and returns a list of nodes
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"""
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_names_version = 0
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def __init__(self):
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self._names = util.sortdict()
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addns = self.addnamespace
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# we need current mercurial named objects (bookmarks, tags, and
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# branches) to be initialized somewhere, so that place is here
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addns("bookmarks",
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lambda repo, name: tolist(repo._bookmarks.get(name)))
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addns("tags",
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lambda repo, name: tolist(repo._tagscache.tags.get(name)))
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def addnamespace(self, namespace, namemap, order=None):
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"""
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register a namespace
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namespace: the name to be registered (in plural form)
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namemap: function that inputs a node, output name(s)
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order: optional argument to specify the order of namespaces
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(e.g. 'branches' should be listed before 'bookmarks')
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"""
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val = {'namemap': namemap}
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if order is not None:
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self._names.insert(order, namespace, val)
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else:
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self._names[namespace] = val
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def singlenode(self, repo, name):
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"""
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Return the 'best' node for the given name. Best means the first node
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in the first nonempty list returned by a name-to-nodes mapping function
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in the defined precedence order.
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Raises a KeyError if there is no such node.
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"""
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for ns, v in self._names.iteritems():
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n = v['namemap'](repo, name)
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if n:
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# return max revision number
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if len(n) > 1:
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cl = repo.changelog
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maxrev = max(cl.rev(node) for node in n)
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return cl.node(maxrev)
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return n[0]
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raise KeyError(_('no such name: %s') % name)
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