Mercurial > hg
view mercurial/namespaces.py @ 23563:114992041625
namespaces: add branches
Note that the exception-catching from the previous branchtip check is moved up
to catch exceptions from the try block surrounding the namespace lookup.
author | Sean Farley <sean.michael.farley@gmail.com> |
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date | Fri, 17 Oct 2014 15:27:12 -0700 |
parents | 59e703aecaf6 |
children | 4c4c967814ef |
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from i18n import _ from mercurial import util def tolist(val): """ a convenience method to return an empty list instead of None """ if val is None: return [] else: return [val] class namespaces(object): """ provides an interface to register a generic many-to-many mapping between some (namespaced) names and nodes. The goal here is to control the pollution of jamming things into tags or bookmarks (in extension-land) and to simplify internal bits of mercurial: log output, tab completion, etc. More precisely, we define a list of names (the namespace) and a mapping of names to nodes. This name mapping returns a list of nodes. Furthermore, each name mapping will be passed a name to lookup which might not be in its domain. In this case, each method should return an empty list and not raise an error. We'll have a dictionary '_names' where each key is a namespace and its value is a dictionary of functions: 'namemap': function that takes a name and returns a list of nodes """ _names_version = 0 def __init__(self): self._names = util.sortdict() addns = self.addnamespace # we need current mercurial named objects (bookmarks, tags, and # branches) to be initialized somewhere, so that place is here addns("bookmarks", lambda repo, name: tolist(repo._bookmarks.get(name))) addns("tags", lambda repo, name: tolist(repo._tagscache.tags.get(name))) addns("branches", lambda repo, name: tolist(repo.branchtip(name))) def addnamespace(self, namespace, namemap, order=None): """ register a namespace namespace: the name to be registered (in plural form) namemap: function that inputs a node, output name(s) order: optional argument to specify the order of namespaces (e.g. 'branches' should be listed before 'bookmarks') """ val = {'namemap': namemap} if order is not None: self._names.insert(order, namespace, val) else: self._names[namespace] = val def singlenode(self, repo, name): """ Return the 'best' node for the given name. Best means the first node in the first nonempty list returned by a name-to-nodes mapping function in the defined precedence order. Raises a KeyError if there is no such node. """ for ns, v in self._names.iteritems(): n = v['namemap'](repo, name) if n: # return max revision number if len(n) > 1: cl = repo.changelog maxrev = max(cl.rev(node) for node in n) return cl.node(maxrev) return n[0] raise KeyError(_('no such name: %s') % name)