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from string import ascii_letters, digits
ALLOWED_KEYS = ascii_letters + digits + "`'"
class NonexistantBookmark(Exception):
pass
class Bookmarks(object):
def __init__(self, path = None):
import string, re, os
self.dct = {}
if path is None:
self.path = os.path.expanduser("~/.ranger/bookmarks")
self.load_pattern = re.compile(r"^[\d\w`']:.")
self.enter_dir_function = None
self.last_mtime = None
def load_dict(self):
import os
dct = {}
if os.access(self.path, os.R_OK):
f = open(self.path, 'r')
for line in f:
if self.load_pattern.match(line):
key, value = line[0], line[2:-1]
if key in ALLOWED_KEYS:
dct[key] = value
f.close()
return dct
else:
raise OSError('Cannot read the given path')
def set_dict(self, dct):
self.dct.clear()
self.dct.update(dct)
self.original_dict = self.dct.copy()
self.last_mtime = self.get_mtime()
def get_mtime(self):
import os
try:
return os.stat(self.path).st_mtime
except OSError:
return None
def load(self):
try:
new_dict = self.load_dict()
except OSError:
return
self.set_dict(new_dict)
def delete(self, key):
if key in self.dct:
del self.dct[key]
self.save()
def update(self):
try:
real_dict = self.load_dict()
except OSError:
return
for key in set(self.dct.keys()) | set(real_dict.keys()):
if key in self.dct:
current = self.dct[key]
else:
current = None
if key in self.original_dict:
original = self.original_dict[key]
else:
original = None
if key in real_dict:
real = real_dict[key]
else:
real = None
if current == original and current != real:
continue
if key not in self.dct:
del real_dict[key]
else:
real_dict[key] = current
self.set_dict(real_dict)
def reload_if_outdated(self):
if self.last_mtime != self.get_mtime():
self.update()
def enter(self, key):
if self.enter_dir_function is not None:
self.enter_dir_function(self[key])
else:
raise RuntimeError('Not specified how to enter a directory')
def remember(self, value):
self["`"] = value
self["'"] = value
def __getitem__(self, key):
if key in self.dct:
return self.dct[key]
else:
raise NonexistantBookmark()
def __setitem__(self, key, value):
if key in ALLOWED_KEYS:
self.dct[key] = value
self.save()
def __contains__(self, key):
return key in self.dct
def save(self):
import os
self.update()
if os.access(self.path, os.W_OK):
f = open(self.path, 'w')
for key, value in self.dct.items():
if type(key) == str\
and type(value) == str \
and key in ALLOWED_KEYS:
f.write("{0}:{1}\n".format(str(key), str(value)))
f.close()
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