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vcs / vcs / nodes.py

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# -*- coding: utf-8 -*-
"""
    vcs.nodes
    ~~~~~~~~~

    Module holding everything related to vcs nodes.

    :created_on: Apr 8, 2010
    :copyright: (c) 2010-2011 by Marcin Kuzminski, Lukasz Balcerzak.
"""
import stat
import posixpath
import mimetypes

from vcs.utils.lazy import LazyProperty
from vcs.utils import safe_unicode
from vcs.exceptions import NodeError
from vcs.exceptions import RemovedFileNodeError

from pygments import lexers


class NodeKind:
    DIR = 1
    FILE = 2


class NodeState:
    ADDED = u'added'
    CHANGED = u'changed'
    NOT_CHANGED = u'not changed'
    REMOVED = u'removed'


class NodeGeneratorBase(object):
    """
    Base class for removed added and changed filenodes, it's a lazy generator
    class that will create filenodes only on iteration or call

    The len method doesn't need to create filenodes at all
    """

    def __init__(self, current_paths, cs):
        self.cs = cs
        self.current_paths = current_paths

    def __call__(self):
        return [n for n in self]

    def __getslice__(self, i, j):
        for p in self.current_paths[i:j]:
            yield self.cs.get_node(p)

    def __len__(self):
        return len(self.current_paths)

    def __iter__(self):
        for p in self.current_paths:
            yield self.cs.get_node(p)


class AddedFileNodesGenerator(NodeGeneratorBase):
    """
    Class holding Added files for current changeset
    """
    pass


class ChangedFileNodesGenerator(NodeGeneratorBase):
    """
    Class holding Changed files for current changeset
    """
    pass


class RemovedFileNodesGenerator(NodeGeneratorBase):
    """
    Class holding removed files for current changeset
    """
    def __iter__(self):
        for p in self.current_paths:
            yield RemovedFileNode(path=p)

    def __getslice__(self, i, j):
        for p in self.current_paths[i:j]:
            yield RemovedFileNode(path=p)


class Node(object):
    """
    Simplest class representing file or directory on repository.  SCM backends
    should use ``FileNode`` and ``DirNode`` subclasses rather than ``Node``
    directly.

    Node's ``path`` cannot start with slash as we operate on *relative* paths
    only. Moreover, every single node is identified by the ``path`` attribute,
    so it cannot end with slash, too. Otherwise, path could lead to mistakes.
    """

    def __init__(self, path, kind):
        if path.startswith('/'):
            raise NodeError("Cannot initialize Node objects with slash at "
                "the beginning as only relative paths are supported")
        self.path = path.rstrip('/')
        if path == '' and kind != NodeKind.DIR:
            raise NodeError("Only DirNode and its subclasses may be "
                            "initialized with empty path")
        self.kind = kind
        #self.dirs, self.files = [], []
        if self.is_root() and not self.is_dir():
            raise NodeError("Root node cannot be FILE kind")

    @LazyProperty
    def parent(self):
        parent_path = self.get_parent_path()
        if parent_path:
            if self.changeset:
                return self.changeset.get_node(parent_path)
            return DirNode(parent_path)
        return None

    @LazyProperty
    def name(self):
        """
        Returns name of the node so if its path
        then only last part is returned.
        """
        return safe_unicode(self.path.rstrip('/').split('/')[-1])

    def _get_kind(self):
        return self._kind

    def _set_kind(self, kind):
        if hasattr(self, '_kind'):
            raise NodeError("Cannot change node's kind")
        else:
            self._kind = kind
            # Post setter check (path's trailing slash)
            if self.path.endswith('/'):
                raise NodeError("Node's path cannot end with slash")

    kind = property(_get_kind, _set_kind)

    def __cmp__(self, other):
        """
        Comparator using name of the node, needed for quick list sorting.
        """
        kind_cmp = cmp(self.kind, other.kind)
        if kind_cmp:
            return kind_cmp
        return cmp(self.name, other.name)

    def __eq__(self, other):
        for attr in ['name', 'path', 'kind']:
            if getattr(self, attr) != getattr(other, attr):
                return False
        if self.is_file():
            if self.content != other.content:
                return False
        else:
            # For DirNode's check without entering each dir
            self_nodes_paths = list(sorted(n.path for n in self.nodes))
            other_nodes_paths = list(sorted(n.path for n in self.nodes))
            if self_nodes_paths != other_nodes_paths:
                return False
        return True

    def __nq__(self, other):
        return not self.__eq__(other)

    def __repr__(self):
        return '<%s %r>' % (self.__class__.__name__, self.path)

    def __str__(self):
        return self.__repr__()

    def __unicode__(self):
        return self.name

    def get_parent_path(self):
        """
        Returns node's parent path or empty string if node is root.
        """
        if self.is_root():
            return ''
        return posixpath.dirname(self.path.rstrip('/')) + '/'

    def is_file(self):
        """
        Returns ``True`` if node's kind is ``NodeKind.FILE``, ``False``
        otherwise.
        """
        return self.kind == NodeKind.FILE

    def is_dir(self):
        """
        Returns ``True`` if node's kind is ``NodeKind.DIR``, ``False``
        otherwise.
        """
        return self.kind == NodeKind.DIR

    def is_root(self):
        """
        Returns ``True`` if node is a root node and ``False`` otherwise.
        """
        return self.kind == NodeKind.DIR and self.path == ''

    @LazyProperty
    def added(self):
        return self.state is NodeState.ADDED

    @LazyProperty
    def changed(self):
        return self.state is NodeState.CHANGED

    @LazyProperty
    def not_changed(self):
        return self.state is NodeState.NOT_CHANGED

    @LazyProperty
    def removed(self):
        return self.state is NodeState.REMOVED


class FileNode(Node):
    """
    Class representing file nodes.

    :attribute: path: path to the node, relative to repostiory's root
    :attribute: content: if given arbitrary sets content of the file
    :attribute: changeset: if given, first time content is accessed, callback
    :attribute: mode: octal stat mode for a node. Default is 0100644.
    """

    def __init__(self, path, content=None, changeset=None, mode=None):
        """
        Only one of ``content`` and ``changeset`` may be given. Passing both
        would raise ``NodeError`` exception.

        :param path: relative path to the node
        :param content: content may be passed to constructor
        :param changeset: if given, will use it to lazily fetch content
        :param mode: octal representation of ST_MODE (i.e. 0100644)
        """

        if content and changeset:
            raise NodeError("Cannot use both content and changeset")
        super(FileNode, self).__init__(path, kind=NodeKind.FILE)
        self.changeset = changeset
        self._content = content
        self._mode = mode or 0100644

    @LazyProperty
    def mode(self):
        """
        Returns lazily mode of the FileNode. If ``changeset`` is not set, would
        use value given at initialization or 0100644 (default).
        """
        if self.changeset:
            mode = self.changeset.get_file_mode(self.path)
        else:
            mode = self._mode
        return mode

    @property
    def content(self):
        """
        Returns lazily content of the FileNode. If possible, would try to
        decode content from UTF-8.
        """
        if self.changeset:
            content = self.changeset.get_file_content(self.path)
        else:
            content = self._content

        if bool(content and '\0' in content):
            return content
        return safe_unicode(content)

    @LazyProperty
    def size(self):
        if self.changeset:
            return self.changeset.get_file_size(self.path)
        raise NodeError("Cannot retrieve size of the file without related "
            "changeset attribute")

    @LazyProperty
    def message(self):
        if self.changeset:
            return self.last_changeset.message
        raise NodeError("Cannot retrieve message of the file without related "
            "changeset attribute")

    @LazyProperty
    def last_changeset(self):
        if self.changeset:
            return self.changeset.get_file_changeset(self.path)
        raise NodeError("Cannot retrieve last changeset of the file without "
            "related changeset attribute")

    def get_mimetype(self):
        """
        Mimetype is calculated based on the file's content. If ``_mimetype``
        attribute is available, it will be returned (backends which store
        mimetypes or can easily recognize them, should set this private
        attribute to indicate that type should *NOT* be calculated).
        """
        if hasattr(self, '_mimetype'):
            if (isinstance(self._mimetype,(tuple,list,)) and 
                len(self._mimetype) == 2):
                return self._mimetype
            else:
                raise NodeError('given _mimetype attribute must be an 2 '
                               'element list or tuple')

        mtype,encoding = mimetypes.guess_type(self.name)

        if mtype is None:
            if self.is_binary:
                mtype = 'application/octet-stream'
                encoding = None
            else:
                mtype = 'text/plain'
                encoding = None
        return mtype,encoding
    
    @LazyProperty
    def mimetype(self):
        """
        Wrapper around full mimetype info. It returns only type of fetched
        mimetype without the encoding part. use get_mimetype function to fetch
        full set of (type,encoding)
        """
        return self.get_mimetype()[0]
    
    @LazyProperty
    def mimetype_main(self):
        return self.mimetype.split('/')[0]

    @LazyProperty
    def lexer(self):
        """
        Returns pygment's lexer class. Would try to guess lexer taking file's
        content, name and mimetype.
        """
        try:
            lexer = lexers.guess_lexer_for_filename(self.name, self.content)
        except lexers.ClassNotFound:
            lexer = lexers.TextLexer()
        # returns first alias
        return lexer

    @LazyProperty
    def lexer_alias(self):
        """
        Returns first alias of the lexer guessed for this file.
        """
        return self.lexer.aliases[0]

    @LazyProperty
    def history(self):
        """
        Returns a list of changeset for this file in which the file was changed
        """
        if self.changeset is None:
            raise NodeError('Unable to get changeset for this FileNode')
        return self.changeset.get_file_history(self.path)

    @LazyProperty
    def annotate(self):
        """
        Returns a list of three element tuples with lineno,changeset and line
        """
        if self.changeset is None:
            raise NodeError('Unable to get changeset for this FileNode')
        return self.changeset.get_file_annotate(self.path)

    @LazyProperty
    def state(self):
        if not self.changeset:
            raise NodeError("Cannot check state of the node if it's not "
                "linked with changeset")
        elif self.path in (node.path for node in self.changeset.added):
            return NodeState.ADDED
        elif self.path in (node.path for node in self.changeset.changed):
            return NodeState.CHANGED
        else:
            return NodeState.NOT_CHANGED

    @property
    def is_binary(self):
        """
        Returns True if file has binary content.
        """
        bin = '\0' in self.content
        return bin

    @LazyProperty
    def extension(self):
        """Returns filenode extension"""
        return self.name.split('.')[-1]

    def is_executable(self):
        """
        Returns ``True`` if file has executable flag turned on.
        """
        return bool(self.mode & stat.S_IXUSR)


class RemovedFileNode(FileNode):
    """
    Dummy FileNode class - trying to access any public attribute except path,
    name, kind or state (or methods/attributes checking those two) would raise
    RemovedFileNodeError.
    """
    ALLOWED_ATTRIBUTES = ['name', 'path', 'state', 'is_root', 'is_file',
        'is_dir', 'kind', 'added', 'changed', 'not_changed', 'removed']

    def __init__(self, path):
        """
        :param path: relative path to the node
        """
        super(RemovedFileNode, self).__init__(path=path)

    def __getattribute__(self, attr):
        if attr.startswith('_') or attr in RemovedFileNode.ALLOWED_ATTRIBUTES:
            return super(RemovedFileNode, self).__getattribute__(attr)
        raise RemovedFileNodeError("Cannot access attribute %s on "
            "RemovedFileNode" % attr)

    @LazyProperty
    def state(self):
        return NodeState.REMOVED


class DirNode(Node):
    """
    DirNode stores list of files and directories within this node.
    Nodes may be used standalone but within repository context they
    lazily fetch data within same repositorty's changeset.
    """

    def __init__(self, path, nodes=(), changeset=None):
        """
        Only one of ``nodes`` and ``changeset`` may be given. Passing both
        would raise ``NodeError`` exception.

        :param path: relative path to the node
        :param nodes: content may be passed to constructor
        :param changeset: if given, will use it to lazily fetch content
        :param size: always 0 for ``DirNode``
        """
        if nodes and changeset:
            raise NodeError("Cannot use both nodes and changeset")
        super(DirNode, self).__init__(path, NodeKind.DIR)
        self.changeset = changeset
        self._nodes = nodes

    @LazyProperty
    def content(self):
        raise NodeError("%s represents a dir and has no ``content`` attribute"
            % self)

    @LazyProperty
    def nodes(self):
        if self.changeset:
            nodes = self.changeset.get_nodes(self.path)
        else:
            nodes = self._nodes
        self._nodes_dict = dict((node.path, node) for node in nodes)
        return sorted(nodes)

    @LazyProperty
    def files(self):
        return sorted((node for node in self.nodes if node.is_file()))

    @LazyProperty
    def dirs(self):
        return sorted((node for node in self.nodes if node.is_dir()))

    def __iter__(self):
        for node in self.nodes:
            yield node

    def get_node(self, path):
        """
        Returns node from within this particular ``DirNode``, so it is now
        allowed to fetch, i.e. node located at 'docs/api/index.rst' from node
        'docs'. In order to access deeper nodes one must fetch nodes between
        them first - this would work::

           docs = root.get_node('docs')
           docs.get_node('api').get_node('index.rst')

        :param: path - relative to the current node

        .. note::
           To access lazily (as in example above) node have to be initialized
           with related changeset object - without it node is out of
           context and may know nothing about anything else than nearest
           (located at same level) nodes.
        """
        try:
            path = path.rstrip('/')
            if path == '':
                raise NodeError("Cannot retrieve node without path")
            self.nodes  # access nodes first in order to set _nodes_dict
            paths = path.split('/')
            if len(paths) == 1:
                if not self.is_root():
                    path = '/'.join((self.path, paths[0]))
                else:
                    path = paths[0]
                return self._nodes_dict[path]
            elif len(paths) > 1:
                if self.changeset is None:
                    raise NodeError("Cannot access deeper "
                                    "nodes without changeset")
                else:
                    path1, path2 = paths[0], '/'.join(paths[1:])
                    return self.get_node(path1).get_node(path2)
            else:
                raise KeyError
        except KeyError:
            raise NodeError("Node does not exist at %s" % path)

    @LazyProperty
    def state(self):
        raise NodeError("Cannot access state of DirNode")

    @LazyProperty
    def size(self):
        size = 0
        for root, dirs, files in self.changeset.walk(self.path):
            for f in files:
                size += f.size

        return size


class RootNode(DirNode):
    """
    DirNode being the root node of the repository.
    """

    def __init__(self, nodes=(), changeset=None):
        super(RootNode, self).__init__(path='', nodes=nodes,
            changeset=changeset)

    def __repr__(self):
        return '<%s>' % self.__class__.__name__