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annotate mercurial/namespaces.py @ 23557:b04b27aa6da3

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namespaces: add a convenience property for the weakref _repo
author Sean Farley <sean.michael.farley@gmail.com>
date Sun, 14 Dec 2014 16:22:24 -0800
parents 7e1da5d004eb
children 3198aac7a95d
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1 from mercurial import util
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2 import weakref
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3
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4 def tolist(val):
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5 """
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6 a convenience method to return an empty list instead of None
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7 """
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8 if val is None:
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9 return []
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10 else:
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11 return [val]
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12
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13 class namespaces(object):
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14 """
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15 provides an interface to register a generic many-to-many mapping between
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16 some (namespaced) names and nodes. The goal here is to control the
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17 pollution of jamming things into tags or bookmarks (in extension-land) and
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18 to simplify internal bits of mercurial: log output, tab completion, etc.
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19
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20 More precisely, we define a list of names (the namespace) and a mapping of
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21 names to nodes. This name mapping returns a list of nodes.
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22
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23 Furthermore, each name mapping will be passed a name to lookup which might
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24 not be in its domain. In this case, each method should return an empty list
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25 and not raise an error.
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26
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27 We'll have a dictionary '_names' where each key is a namespace and
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28 its value is a dictionary of functions:
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29 'namemap': function that takes a name and returns a list of nodes
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30 """
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31
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32 _names_version = 0
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33
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34 def __init__(self, repo):
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35 self._names = util.sortdict()
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36 self._repo = weakref.ref(repo)
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37
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38 @property
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39 def repo(self):
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40 return self._repo()
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41
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42 def addnamespace(self, namespace, namemap, order=None):
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43 """
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44 register a namespace
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45
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46 namespace: the name to be registered (in plural form)
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47 namemap: function that inputs a node, output name(s)
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48 order: optional argument to specify the order of namespaces
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49 (e.g. 'branches' should be listed before 'bookmarks')
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50 """
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51 val = {'namemap': namemap}
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52 if order is not None:
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53 self._names.insert(order, namespace, val)
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54 else:
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55 self._names[namespace] = val