Mercurial > hg
view mercurial/namespaces.py @ 23607:0fd778ef0f61
namespaces: add nodemap property
This patch adds a node-to-name map property to the namespace. This is necessary
because we cannot simply invert the name-to-node map because we do not assume
the name-to-node map to be unique (for example, consider named branches: many
nodes have one branch name).
The node-to-name is helpful in log commands where we are already iterating over
a set of nodes and want to display some kind of naming information to the user.
author | Sean Farley <sean.michael.farley@gmail.com> |
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date | Mon, 15 Dec 2014 00:24:23 -0800 |
parents | 80e3cbe227d1 |
children | 807ee1a02bb0 |
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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), a mapping of names to nodes, and a mapping from nodes to names. Each 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: 'templatename': name to use for templating (usually the singular form of the plural namespace name) 'namemap': function that takes a name and returns a list of nodes 'nodemap': function that takes a node and returns a list of names """ _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", "bookmark", lambda repo, name: tolist(repo._bookmarks.get(name)), lambda repo, name: repo.nodebookmarks(name)) addns("tags", "tag", lambda repo, name: tolist(repo._tagscache.tags.get(name)), lambda repo, name: repo.nodetags(name)) addns("branches", "branch", lambda repo, name: tolist(repo.branchtip(name)), lambda repo, node: [repo[node].branch()]) def addnamespace(self, namespace, templatename, namemap, nodemap, order=None): """ register a namespace namespace: the name to be registered (in plural form) templatename: the name to use for templating namemap: function that inputs a node, output name(s) nodemap: function that inputs a name, output node(s) order: optional argument to specify the order of namespaces (e.g. 'branches' should be listed before 'bookmarks') """ val = {'templatename': templatename, 'namemap': namemap, 'nodemap': nodemap} 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) def templatename(self, namespace): """method that returns the template name of a namespace""" return self._names[namespace]['templatename']