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from __future__ import with_statement
import os
import re
class ConfigActionException(Exception):
def __init__(self, action, value):
self.action = action
super(self.__class__, self).__init__(value)
def __str__(self):
return super(self.__class__, self).__str__() + " (" + repr(self.action) + ")"
class ConfigAction(object):
@classmethod
def matches(cls, filename):
raise Exception('Not implemented')
def __init__(self, config, relpath, source, dest):
self.source = source
self.dest = dest
self.relpath = relpath
self.config = config
def __repr__(self):
return self.__class__.__name__+': '+self.source+' => '+self.dest
def check(self):
raise Exception('Not implemented')
def sync(self):
raise Exception('Not implemented')
def dest_path(self):
return os.path.normpath(\
os.path.join(self.config.dest, self.relpath, self.dest))
def source_path(self):
return os.path.normpath(\
os.path.join(self.config.source, self.relpath, self.source))
def _makedirs(self):
dir = os.path.dirname(self.dest_path())
if not os.path.isdir(dir):
os.makedirs(dir)
class SymlinkConfigAction(ConfigAction):
@classmethod
def matches(cls, filename):
return filename
def check(self):
source = self.source_path()
if not os.path.exists(source):
raise ConfigActionException(self, "Source does not exists")
dest = self.dest_path()
if os.path.lexists(dest):
if not os.path.islink(dest):
raise ConfigActionException(self, "Destination exists and is not a link")
def sync(self):
source = self.source_path()
dest = self.dest_path()
if os.path.lexists(dest):
# if the link already exists
if os.path.islink(dest):
# if the old link is broken or incorrect
if not os.path.exists(dest) \
or not os.path.samefile(dest, source):
os.unlink(dest)
print "Link target altered"
else:
return
else:
self._makedirs()
relsource = os.path.normpath(os.path.relpath(source, os.path.join(self.config.dest, self.relpath)))
os.symlink(relsource, dest)
print "Created new link: "+dest+" => "+source
class CopyConfigAction(ConfigAction):
pass #TODO
class ProgrammableConfigAction(ConfigAction):
matched = re.compile("\.p\.py$")
@classmethod
def matches(cls, filename):
if cls.matched.search(filename):
return cls.matched.sub("", filename)
return False
def check(self):
class SymlinkForwarder(Exception):
def __init__(self, filename):
self.filename = filename
class IgnoreForwarder(Exception):
pass
def redirect(filename):
raise SymlinkForwarder("_"+filename)
def ignore():
raise IgnoreForwarder()
exec_env = \
{
"options": self.config.options,
"redirect": redirect,
"ignore": ignore,
}
source = self.source_path()
try:
with open(source, "r") as file:
exec compile(file.read(), source, 'exec') in exec_env
except SymlinkForwarder as e:
self.proxy = SymlinkConfigAction(self.config, self.relpath, e.filename, self.dest)
except IgnoreForwarder as e:
self.proxy = None
else:
raise ConfigActionException(self, "Unknown result")
if not self.proxy is None:
return self.proxy.check()
def sync(self):
if not self.proxy is None:
return self.proxy.sync()
def __repr__(self):
return self.__class__.__name__+': '+self.source+' => PROXY '+repr(self.proxy)
class IgnoreConfigAction(ConfigAction):
ignored = re.compile("_|\.git$|\.gitignore$")
@classmethod
def matches(cls, filename):
if cls.ignored.match(filename):
return None
return False
def __repr__(self):
return self.__class__.__name__+': '+self.source+' => IGNORED'
class ConfigSource(object):
def __init__(self, source, dest, classes = None, options = None):
# handle '~'
self.source = os.path.expanduser(source)
self.dest = os.path.expanduser(dest)
if classes:
self.classes = classes
else:
self.classes = [
ProgrammableConfigAction,
IgnoreConfigAction,
SymlinkConfigAction,
]
if options:
self.options = options
else:
self.options = []
def sync(self):
"gather files and synchronize them"
self.analyze()
self.execute()
def analyze(self):
"gather all files"
def walker(_, path, files):
relpath = os.path.relpath(path, self.source)
for filename in (file for file in files \
if not os.path.isdir(os.path.join(path, file))):
self.add(relpath, filename)
self.tree = {}
os.path.walk(self.source, walker, None)
def add(self, relpath, filename):
"add a file if it can be associated to an action"
def get_file_class(filename):
for cls in self.classes:
dest = cls.matches(filename)
if dest is not False:
return (cls, dest)
raise Exception("No class found for "+os.path.join(relpath, filename))
cls, dest = get_file_class(filename)
if dest is not None:
files = self.tree.setdefault(relpath, {})
if files.has_key(dest):
raise Exception('Conflict: '+filename+' with '+files[dest])
files[dest] = cls(self, relpath, filename, dest)
def execute(self):
"executes all actions if everything is alright"
for file in self:
file.check()
for file in self:
file.sync()
def __iter__(self):
"iterate over all analyzed files"
for files in self.tree.itervalues():
for file in files.itervalues():
yield file
def __repr__(self):
return "\n".join(\
(action.relpath+': '+repr(action) for action in self))
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