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Diffstat (limited to 'lib/git/refs.py')
| -rw-r--r-- | lib/git/refs.py | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/lib/git/refs.py b/lib/git/refs.py new file mode 100644 index 00000000..cb730edb --- /dev/null +++ b/lib/git/refs.py @@ -0,0 +1,241 @@ +# refs.py +# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors +# +# This module is part of GitPython and is released under +# the BSD License: http://www.opensource.org/licenses/bsd-license.php +""" +Module containing all ref based objects +""" +from objects.base import Object +from objects.util import get_object_type_by_name + +class Ref(object): + """ + Represents a named reference to any object + """ + __slots__ = ("path", "object") + + def __init__(self, path, object = None): + """ + Initialize this instance + + ``path`` + Path relative to the .git/ directory pointing to the ref in question, i.e. + refs/heads/master + + ``object`` + Object instance, will be retrieved on demand if None + """ + self.path = path + self.object = object + + def __str__(self): + return self.name + + def __repr__(self): + return '<git.%s "%s">' % (self.__class__.__name__, self.path) + + def __eq__(self, other): + return self.path == other.path and self.object == other.object + + def __ne__(self, other): + return not ( self == other ) + + def __hash__(self): + return hash(self.path) + + @property + def name(self): + """ + Returns + (shortest) Name of this reference - it may contain path components + """ + # first two path tokens are can be removed as they are + # refs/heads or refs/tags or refs/remotes + tokens = self.path.split('/') + if len(tokens) < 3: + return self.path # could be refs/HEAD + + return '/'.join(tokens[2:]) + + @classmethod + def find_all(cls, repo, common_path = "refs", **kwargs): + """ + Find all refs in the repository + + ``repo`` + is the Repo + + ``common_path`` + Optional keyword argument to the path which is to be shared by all + returned Ref objects + + ``kwargs`` + Additional options given as keyword arguments, will be passed + to git-for-each-ref + + Returns + git.Ref[] + + List is sorted by committerdate + The returned objects are compatible to the Ref base, but represent the + actual type, such as Head or Tag + """ + + options = {'sort': "committerdate", + 'format': "%(refname)%00%(objectname)%00%(objecttype)%00%(objectsize)"} + + options.update(kwargs) + + output = repo.git.for_each_ref(common_path, **options) + return cls.list_from_string(repo, output) + + @classmethod + def list_from_string(cls, repo, text): + """ + Parse out ref information into a list of Ref compatible objects + + ``repo`` + is the Repo + ``text`` + is the text output from the git-for-each-ref command + + Returns + git.Ref[] + + list of Ref objects + """ + heads = [] + + for line in text.splitlines(): + heads.append(cls.from_string(repo, line)) + + return heads + + @classmethod + def from_string(cls, repo, line): + """ + Create a new Ref instance from the given string. + + ``repo`` + is the Repo + + ``line`` + is the formatted ref information + + Format:: + + name: [a-zA-Z_/]+ + <null byte> + id: [0-9A-Fa-f]{40} + + Returns + git.Head + """ + full_path, hexsha, type_name, object_size = line.split("\x00") + obj = get_object_type_by_name(type_name)(repo, hexsha) + obj.size = object_size + return cls(full_path, obj) + + +class Head(Ref): + """ + A Head is a named reference to a Commit. Every Head instance contains a name + and a Commit object. + + Examples:: + + >>> repo = Repo("/path/to/repo") + >>> head = repo.heads[0] + + >>> head.name + 'master' + + >>> head.commit + <git.Commit "1c09f116cbc2cb4100fb6935bb162daa4723f455"> + + >>> head.commit.id + '1c09f116cbc2cb4100fb6935bb162daa4723f455' + """ + + @property + def commit(self): + """ + Returns + Commit object the head points to + """ + return self.object + + @classmethod + def find_all(cls, repo, common_path = "refs/heads", **kwargs): + """ + Returns + git.Head[] + + For more documentation, please refer to git.base.Ref.find_all + """ + return super(Head,cls).find_all(repo, common_path, **kwargs) + + def __repr__(self): + return '<git.Head "%s">' % self.name + + + +class TagRef(Ref): + """ + Class representing a lightweight tag reference which either points to a commit + or to a tag object. In the latter case additional information, like the signature + or the tag-creator, is available. + + This tag object will always point to a commit object, but may carray additional + information in a tag object:: + + tagref = TagRef.find_all(repo)[0] + print tagref.commit.message + if tagref.tag is not None: + print tagref.tag.message + """ + + __slots__ = "tag" + + def __init__(self, path, commit_or_tag): + """ + Initialize a newly instantiated Tag + + ``path`` + is the full path to the tag + + ``commit_or_tag`` + is the Commit or TagObject that this tag ref points to + """ + super(TagRef, self).__init__(path, commit_or_tag) + self.tag = None + + if commit_or_tag.type == "tag": + self.tag = commit_or_tag + # END tag object handling + + @property + def commit(self): + """ + Returns + Commit object the tag ref points to + """ + if self.object.type == "commit": + return self.object + # it is a tag object + return self.object.object + + @classmethod + def find_all(cls, repo, common_path = "refs/tags", **kwargs): + """ + Returns + git.Tag[] + + For more documentation, please refer to git.base.Ref.find_all + """ + return super(TagRef,cls).find_all(repo, common_path, **kwargs) + + +# provide an alias +Tag = TagRef |