author | Tero Marttila <terom@fixme.fi> |
Fri, 05 Jun 2009 21:47:45 +0300 | |
changeset 61 | fad360dd01da |
parent 60 | 406da27a4be2 |
child 68 | 49388e9fd5fa |
permissions | -rw-r--r-- |
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""" |
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Filesystem path handling |
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""" |
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import os, os.path, errno |
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import codecs, shutil |
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import itertools |
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from utils import lazy_load |
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class Node (object) : |
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""" |
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A filesystem object is basically just complicated representation of a path. |
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On the plus side, it has a parent node and can handle unicode/binary paths. |
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""" |
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# the binary name |
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fsname = None |
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# the unicode name |
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name = None |
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def decode_fsname (self, fsname) : |
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""" |
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Decode the given raw byte string representing a filesystem name into an user-readable unicode name. |
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XXX: currently just hardcoded as utf-8 |
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""" |
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return fsname.decode('utf-8', 'replace') |
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def encode_name (self, name) : |
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""" |
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Returns a suitable fsname for the given unicode name or strict ASCII str |
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XXX: currently just hardcoded as utf-8 |
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""" |
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# this should fail for non-ASCII str |
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return name.encode('utf-8') |
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@classmethod |
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def from_node (cls, node) : |
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""" |
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Construct from a Node object |
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""" |
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return cls(node.parent, node.fsname, node.name, node.config) |
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def __init__ (self, parent, fsname=None, name=None, config=None) : |
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""" |
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Initialize the node with a parent and both name/fsname. |
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If not given, fsname is encoded from name, or name decoded from fsname, using encode/decode_name. |
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If parent is given, but both fsname and name are None, then this node will be equal to the parent. |
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""" |
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assert not fsname or isinstance(fsname, str) |
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if parent and not fsname and not name : |
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# no name given -> we're the same as parent |
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self.parent, self.config, self.fsname, self.name = parent.parent, parent.config, parent.fsname, parent.name |
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else : |
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# store |
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self.parent = parent |
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# config, either as given, or copy from parent |
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if config : |
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self.config = config |
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else : |
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self.config = parent.config |
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# fsname |
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if fsname : |
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self.fsname = fsname |
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else : |
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self.fsname = self.encode_name(name) |
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# name |
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if name : |
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self.name = name |
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else : |
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self.name = self.decode_fsname(fsname) |
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def subnode (self, name) : |
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""" |
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Returns a Node object representing the given name behind this node. |
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The name should either be a plain ASCII string or unicode object. |
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""" |
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return Node(self, name=name) |
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def nodepath (self) : |
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""" |
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Returns the path of nodes from this node to the root node, inclusive |
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""" |
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return self.parent.nodepath() + [self] |
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@lazy_load |
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def path (self) : |
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""" |
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Return the machine-readable root-path for this node |
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""" |
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# build using parent path and our fsname |
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return os.path.join(self.parent.path, self.fsname) |
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@lazy_load |
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def unicodepath (self) : |
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""" |
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Return the human-readable root-path for this node |
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""" |
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|
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# build using parent unicodepath and our name |
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return os.path.join(self.parent.path, self.name) |
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|
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def path_segments (self, unicode=True) : |
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""" |
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Return a series of single-level names describing the path from the root to this node |
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""" |
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|
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return self.parent.path_segments(unicode=unicode) + [self.name if unicode else self.fsname] |
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|
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def exists (self) : |
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""" |
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Tests if this node exists on the physical filesystem |
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""" |
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|
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return os.path.exists(self.path) |
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|
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def is_dir (self) : |
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""" |
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Tests if this node represents a directory on the filesystem |
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""" |
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return os.path.isdir(self.path) |
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def is_file (self) : |
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""" |
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Tests if this node represents a normal file on the filesystem |
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""" |
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|
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return os.path.isfile(self.path) |
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|
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def test (self) : |
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""" |
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Tests that this node exists. Raises an error it not, otherwise, returns the node itself |
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""" |
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157 |
|
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if not self.exists() : |
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raise Exception("Filesystem node does not exist: %s" % self) |
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|
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return self |
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def path_from (self, node) : |
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""" |
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Returns a relative path to this node from the given node. |
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|
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This is the same as path_to, but just reversed. |
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168 |
""" |
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169 |
|
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return node.path_to(self) |
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|
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172 |
def path_to (self, node) : |
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173 |
""" |
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174 |
Returns a relative path from this node to the given node |
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175 |
""" |
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176 |
|
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# get real paths for both |
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178 |
from_path = self.nodepath() |
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to_path = node.nodepath() |
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pivot = None |
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181 |
|
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182 |
# reduce common prefix |
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183 |
while from_path[0] == to_path[0] : |
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184 |
from_path.pop(0) |
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pivot = to_path.pop(0) |
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186 |
|
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187 |
# build path |
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188 |
return Path(*itertools.chain(reversed(from_path), [pivot], to_path)) |
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189 |
|
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190 |
def stat (self, soft=False) : |
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191 |
""" |
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192 |
Returns the os.stat struct for this node. |
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193 |
|
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194 |
If `soft` is given, returns None if this node doesn't exist |
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195 |
""" |
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196 |
|
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197 |
try : |
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198 |
return os.stat(self.path) |
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199 |
|
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200 |
except OSError, e : |
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201 |
# trap ENOENT for soft |
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202 |
if soft and e.errno == errno.ENOENT : |
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203 |
return None |
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204 |
|
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205 |
else : |
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206 |
raise |
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207 |
|
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208 |
# alias str/unicode |
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209 |
str = path |
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210 |
unicode = unicodepath |
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211 |
|
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212 |
def __repr__ (self) : |
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213 |
""" |
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214 |
Returns a str representing this dir |
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215 |
""" |
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216 |
|
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217 |
return "Node(%r, %r)" % (self.parent.path, self.fsname) |
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218 |
|
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219 |
def __cmp__ (self, other) : |
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220 |
""" |
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221 |
Comparisons between Nodes |
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222 |
""" |
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223 |
|
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224 |
return cmp((self.parent, self.name), (other.parent if self.parent else None, other.name)) |
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225 |
|
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226 |
class Path (object) : |
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227 |
""" |
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228 |
A Path is a sequence of Nodes that form a path through the node tree. |
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229 |
|
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230 |
Each node must either be the parent or the child of the following node. |
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231 |
""" |
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232 |
|
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233 |
def __init__ (self, *nodes) : |
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234 |
""" |
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Initialize with the given node path |
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""" |
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|
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self.nodes = nodes |
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|
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def subpath (self, *nodes) : |
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""" |
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Returns a new path with the given node(s) appended |
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""" |
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|
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return Path(*itertools.chain(self.nodes, nodes)) |
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|
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def path_segments (self, unicode=True) : |
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""" |
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Yields a series of physical path segments for this path |
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""" |
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|
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prev = None |
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253 |
|
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for node in self.nodes : |
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if not prev : |
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256 |
# ignore |
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pass |
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258 |
|
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elif prev.parent and prev.parent == node : |
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260 |
# up a level |
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yield u'..' if unicode else '..' |
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|
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else : |
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264 |
# down a level |
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yield node.name if unicode else node.fsname |
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|
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# chained together |
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prev = node |
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|
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def __iter__ (self) : |
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""" |
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272 |
Iterate over the nodes |
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""" |
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|
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return iter(self.nodes) |
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|
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def __unicode__ (self) : |
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""" |
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Returns the unicode human-readable path |
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""" |
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281 |
|
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return os.path.join(*self.path_segments(unicode=True)) |
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|
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def __str__ (self) : |
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""" |
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Returns the binary machine-readable path |
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287 |
""" |
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288 |
|
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return os.path.join(*self.path_segments(unicode=False)) |
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290 |
|
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def __repr__ (self) : |
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return "Path(%s)" % ', '.join(repr(segment) for segment in self.path_segments(unicode=False)) |
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|
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class File (Node) : |
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295 |
""" |
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296 |
A file. Simple, eh? |
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297 |
""" |
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298 |
|
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@property |
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def basename (self) : |
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301 |
""" |
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Returns the "base" part of this file's name, i.e. the filename without the extension |
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""" |
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|
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basename, _ = os.path.splitext(self.name) |
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|
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return basename |
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|
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309 |
@property |
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def fileext (self) : |
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311 |
""" |
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Returns the file extension part of the file's name, without any leading dot |
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""" |
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|
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_, fileext = os.path.splitext(self.name) |
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|
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return fileext.rstrip('.') |
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def matchext (self, ext_list) : |
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320 |
""" |
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Tests if this file's extension is part of the recognized list of extensions |
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322 |
""" |
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323 |
|
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return (self.fileext.lower() in ext_list) |
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|
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def test (self) : |
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""" |
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328 |
Tests that this file exists as a file. Raises an error it not, otherwise, returns itself |
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329 |
""" |
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330 |
|
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331 |
if not self.is_file() : |
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raise Exception("File does not exist: %s" % self) |
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333 |
|
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334 |
return self |
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335 |
|
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336 |
def open (self, mode='r', encoding=None, errors=None, bufsize=None) : |
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337 |
""" |
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338 |
Wrapper for open/codecs.open. |
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339 |
|
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340 |
Raises an error if read_only mode is set and mode contains any of 'wa+' |
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""" |
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342 |
|
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if self.config.read_only and any((c in mode) for c in 'wa+') : |
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raise Exception("Unable to open file for %s due to read_only mode: %s" % (mode, self)) |
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345 |
|
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if encoding : |
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347 |
return codecs.open(self.path, mode, encoding, errors, bufsize) |
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|
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349 |
else : |
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350 |
return open(self.path, mode, bufsize) |
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|
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|
352 |
def copy_from (self, file) : |
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353 |
""" |
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354 |
Replace this file with a copy of the given file with default permissions. |
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|
355 |
|
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|
356 |
Raises an error if read_only mode is set. |
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changeset
|
357 |
|
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|
358 |
XXX: accept mode |
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|
359 |
""" |
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|
360 |
|
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|
361 |
if self.config.read_only : |
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|
362 |
raise Exception("Not copying file as read_only mode is set: %s -> %s" % (file, self)) |
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|
363 |
|
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|
364 |
# perform the copy |
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|
365 |
shutil.copyfile(file.path, self.path) |
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|
366 |
|
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|
367 |
class Directory (Node) : |
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|
368 |
""" |
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369 |
A directory is a node that contains other nodes. |
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|
370 |
""" |
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changeset
|
371 |
|
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372 |
# a list of (test_func, node_type) tuples for use by children() to build subnodes with |
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373 |
NODE_TYPES = None |
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|
374 |
|
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375 |
def subdir (self, name, create=False) : |
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376 |
""" |
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|
377 |
Returns a Directory object representing the name underneath this dir. |
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|
378 |
|
60
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|
379 |
If the create option is given, the directory will be created if it does not exist. Note that this will |
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|
380 |
raise an error if read_only mode is set |
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|
381 |
""" |
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|
382 |
|
60
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|
383 |
subdir = Directory(self, name=name) |
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|
384 |
|
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|
385 |
# try and mkdir? |
60
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|
386 |
if create and not subdir.is_dir() : |
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|
387 |
# create it! |
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|
388 |
subdir.mkdir() |
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changeset
|
389 |
|
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|
390 |
return subdir |
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changeset
|
391 |
|
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|
392 |
def subfile (self, name) : |
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|
393 |
""" |
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|
394 |
Returns a File object representing the name underneath this dir |
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|
395 |
""" |
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changeset
|
396 |
|
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|
397 |
return Directory(self, name=name) |
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|
398 |
|
60
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|
399 |
def test (self) : |
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|
400 |
""" |
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|
401 |
Tests that this dir exists as a dir. Raises an error it not, otherwise, returns itself |
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|
402 |
""" |
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changeset
|
403 |
|
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|
404 |
if not self.is_dir() : |
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|
405 |
raise Exception("Directory does not exist: %s" % self) |
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changeset
|
406 |
|
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changeset
|
407 |
return self |
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changeset
|
408 |
|
55
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|
409 |
def mkdir (self) : |
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|
410 |
""" |
60
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|
411 |
Create this directory with default permissions. |
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changeset
|
412 |
|
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changeset
|
413 |
This will fail if read_only mode is set |
55
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changeset
|
414 |
|
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|
415 |
XXX: mode argument |
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|
416 |
""" |
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changeset
|
417 |
|
60
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|
418 |
if self.config.read_only : |
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|
419 |
# forbidden |
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|
420 |
raise Exception("Unable to create dir due to read_only mode: %s" % self) |
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changeset
|
421 |
|
55
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|
422 |
# do it |
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|
423 |
os.mkdir(self.path) |
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|
424 |
|
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|
425 |
def listdir (self, skip_dotfiles=True) : |
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|
426 |
""" |
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changeset
|
427 |
Yield a series of raw fsnames for nodes in this dir |
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changeset
|
428 |
""" |
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changeset
|
429 |
|
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|
430 |
# expressed |
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|
431 |
return (fsname for fsname in os.listdir(self.path) if not (skip_dotfiles and fsname.startswith('.'))) |
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changeset
|
432 |
|
55
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|
433 |
def subnodes (self, skip_dotfiles=True, sort=True) : |
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|
434 |
""" |
55
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|
435 |
Yield a series of Nodes contained in this dir. |
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changeset
|
436 |
|
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|
437 |
If skip_dotfiles is given, nodes that begin with a . are omitted. |
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changeset
|
438 |
|
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|
439 |
If `sort` is given, the returned nodes will be in sorted order. |
51
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|
440 |
""" |
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|
441 |
|
55
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|
442 |
iter = (Node(self, fsname) for fsname in self.listdir(skip_dotfiles)) |
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|
443 |
|
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|
444 |
if sort : |
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|
445 |
return sorted(iter) |
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|
446 |
|
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|
447 |
else : |
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|
448 |
return iter |
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|
449 |
|
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|
450 |
def __iter__ (self) : |
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|
451 |
""" |
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|
452 |
Iterating over a Directory yields sub-Nodes. |
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changeset
|
453 |
|
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changeset
|
454 |
Dotfiles are skipped. |
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|
455 |
""" |
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changeset
|
456 |
|
55
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|
457 |
return self.subnodes() |
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changeset
|
458 |
|
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|
459 |
@property |
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|
460 |
def root_path (self) : |
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|
461 |
""" |
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parents:
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|
462 |
Build and return a relative path to the root of this dir tree |
55
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changeset
|
463 |
|
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changeset
|
464 |
XXX: move to node |
51
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|
465 |
""" |
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466 |
|
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467 |
# build using parent root_path |
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468 |
return os.path.join('..', self.parent.root_path) |
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|
469 |
|
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470 |
def children (self) : |
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471 |
""" |
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472 |
Yield a series of Node subclasses representing the items in this dir. |
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473 |
|
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474 |
This uses self.NODE_TYPES to figure out what kind of sub-node object to build. This should be a list of |
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|
475 |
(test_func, node_type) |
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476 |
|
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477 |
tuples, of which the first is a function that takes a Node as it's sole argument, and returns a boolean. |
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478 |
For the first test_func which returns True, a Node-subclass object is constructed using node_type.from_node. |
55
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|
479 |
|
77abe8dca695
further work on filesystem.py (path_from proto, stat, open, subdir-create, mkdir, subnodes
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|
480 |
XXX: never used |
51
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|
481 |
""" |
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Tero Marttila <terom@fixme.fi>
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|
482 |
|
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|
483 |
for node in self : |
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|
484 |
# figure out what type to use |
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Tero Marttila <terom@fixme.fi>
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|
485 |
for test_func, node_type in self.NODE_TYPES : |
0f39cb5e4b11
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|
486 |
if test_func(node) : |
0f39cb5e4b11
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|
487 |
# matches, build |
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parents:
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|
488 |
yield node_type.from_node(node) |
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|
489 |
|
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|
490 |
else : |
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491 |
# unknown file type! |
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|
492 |
raise Exception("unrecongized type of file: %s" % node); |
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|
493 |
|
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|
494 |
# assign default Directory.NODE_TYPES |
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|
495 |
Directory.NODE_TYPES = [ |
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496 |
(Node.is_dir, Directory), |
0f39cb5e4b11
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497 |
(Node.is_file, File), |
0f39cb5e4b11
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|
498 |
] |
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|
499 |
|
0f39cb5e4b11
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|
500 |
|
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|
501 |
class Root (Directory) : |
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|
502 |
""" |
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|
503 |
A special Directory that overrides the Node methods to anchor the recursion/etc at some 'real' filesystem path. |
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|
504 |
""" |
0f39cb5e4b11
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|
505 |
|
60
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|
506 |
# XXX: config needs a default |
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|
507 |
def __init__ (self, fspath, config=None) : |
51
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508 |
""" |
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|
509 |
Construct the directory tree root at the given 'real' path, which must be a raw str |
0f39cb5e4b11
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|
510 |
""" |
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
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|
511 |
|
0f39cb5e4b11
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|
512 |
# abuse Node's concept of a "name" a bit |
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|
513 |
super(Root, self).__init__(None, fspath, config=config) |
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|
514 |
|
60
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|
515 |
def nodepath (self) : |
406da27a4be2
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Tero Marttila <terom@fixme.fi>
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|
516 |
""" |
406da27a4be2
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55
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|
517 |
Just return ourself |
406da27a4be2
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Tero Marttila <terom@fixme.fi>
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diff
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|
518 |
""" |
406da27a4be2
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Tero Marttila <terom@fixme.fi>
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55
diff
changeset
|
519 |
|
406da27a4be2
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Tero Marttila <terom@fixme.fi>
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|
520 |
return [self] |
406da27a4be2
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|
521 |
|
51
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|
522 |
@property |
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|
523 |
def path (self) : |
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|
524 |
""" |
0f39cb5e4b11
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|
525 |
Returns the raw path |
0f39cb5e4b11
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|
526 |
""" |
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
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|
527 |
|
0f39cb5e4b11
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|
528 |
return self.fsname |
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|
529 |
|
0f39cb5e4b11
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|
530 |
@property |
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|
531 |
def unicodepath (self) : |
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|
532 |
""" |
0f39cb5e4b11
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|
533 |
Returns the raw decoded path |
0f39cb5e4b11
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|
534 |
""" |
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
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changeset
|
535 |
|
0f39cb5e4b11
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|
536 |
return self.name |
0f39cb5e4b11
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|
537 |
|
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
parents:
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changeset
|
538 |
@property |
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|
539 |
def root_path (self) : |
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|
540 |
""" |
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
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|
541 |
Returns an empty string representing this dir |
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
parents:
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|
542 |
""" |
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
parents:
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|
543 |
|
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
parents:
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|
544 |
return '' |
0f39cb5e4b11
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|
545 |
|
60
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Tero Marttila <terom@fixme.fi>
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|
546 |
def path_segments (self, unicode=True) : |
406da27a4be2
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Tero Marttila <terom@fixme.fi>
parents:
55
diff
changeset
|
547 |
""" |
406da27a4be2
do some filesystem.Path stuff, and read_only mode
Tero Marttila <terom@fixme.fi>
parents:
55
diff
changeset
|
548 |
No path segments |
406da27a4be2
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Tero Marttila <terom@fixme.fi>
parents:
55
diff
changeset
|
549 |
""" |
406da27a4be2
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Tero Marttila <terom@fixme.fi>
parents:
55
diff
changeset
|
550 |
|
406da27a4be2
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Tero Marttila <terom@fixme.fi>
parents:
55
diff
changeset
|
551 |
return [] |
406da27a4be2
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Tero Marttila <terom@fixme.fi>
parents:
55
diff
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|
552 |
|
51
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|
553 |
def __repr__ (self) : |
0f39cb5e4b11
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|
554 |
""" |
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
parents:
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changeset
|
555 |
Override Node.__repr__ to not use self.parent.path |
0f39cb5e4b11
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parents:
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changeset
|
556 |
""" |
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
parents:
diff
changeset
|
557 |
|
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
parents:
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changeset
|
558 |
return "Root(%r)" % self.fsname |
0f39cb5e4b11
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Tero Marttila <terom@fixme.fi>
parents:
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|
559 |