Mercurial > hg
view mercurial/namespaces.py @ 23775:885c0290f7d5
localrepo: add ignoremissing parameter to branchtip
Previously, in the namespaces api, the only caller of branchtip was singlenode
which happened to raise the same exception that branchtip raised: KeyError.
This is a minor change but will allow upcoming patches to use repo.branchtip to
not raise an exception if a branch doesn't exist. After that, it will be
possible for extensions to use the namespace api in a stable way.
author | Sean Farley <sean.michael.farley@gmail.com> |
---|---|
date | Thu, 16 Oct 2014 21:49:28 -0700 |
parents | b9537ee87961 |
children | 9f48242929a9 |
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from i18n import _ from mercurial import util import templatekw 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 and operate on multiple namespaces. See the namespace class below for details on the namespace object. """ _names_version = 0 def __init__(self): self._names = util.sortdict() # shorten the class name for less indentation ns = namespace # we need current mercurial named objects (bookmarks, tags, and # branches) to be initialized somewhere, so that place is here n = ns("bookmarks", "bookmark", lambda repo: repo._bookmarks.keys(), lambda repo, name: tolist(repo._bookmarks.get(name)), lambda repo, name: repo.nodebookmarks(name)) self.addnamespace(n) n = ns("tags", "tag", lambda repo: [t for t, n in repo.tagslist()], lambda repo, name: tolist(repo._tagscache.tags.get(name)), lambda repo, name: repo.nodetags(name)) self.addnamespace(n) n = ns("branches", "branch", lambda repo: repo.branchmap().keys(), lambda repo, name: tolist(repo.branchtip(name, True)), lambda repo, node: [repo[node].branch()]) self.addnamespace(n) def __getitem__(self, namespace): """returns the namespace object""" return self._names[namespace] def __iter__(self): return self._names.__iter__() def iteritems(self): return self._names.iteritems() def addnamespace(self, namespace, order=None): """register a namespace namespace: the name to be registered (in plural form) order: optional argument to specify the order of namespaces (e.g. 'branches' should be listed before 'bookmarks') """ if order is not None: self._names.insert(order, namespace.name, namespace) else: self._names[namespace.name] = namespace # we only generate a template keyword if one does not already exist if namespace.name not in templatekw.keywords: def generatekw(**args): return templatekw.shownames(namespace.name, **args) templatekw.keywords[namespace.name] = generatekw 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) class namespace(object): """provides an interface to a namespace Namespaces are basically 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 mapping of names to nodes, and a mapping from nodes to names. Each mapping returns a list. 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. This namespace object will define the properties we need: 'name': the namespace (plural form) 'templatename': name to use for templating (usually the singular form of the plural namespace name) 'listnames': list of all names in the namespace (usually the keys of a dictionary) 'namemap': function that takes a name and returns a list of nodes 'nodemap': function that takes a node and returns a list of names """ def __init__(self, name, templatename, listnames, namemap, nodemap): """create a namespace name: the namespace to be registered (in plural form) listnames: function to list all names 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) """ self.name = name self.templatename = templatename self.listnames = listnames self.namemap = namemap self.nodemap = nodemap def names(self, repo, node): """method that returns a (sorted) list of names in a namespace that match a given node""" return sorted(self.nodemap(repo, node)) def nodes(self, repo, name): """method that returns a list of nodes in a namespace that match a given name. """ return sorted(self.namemap(repo, name))