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# Copyright (C) 2009, 2010 Roman Zimbelmann <romanz@lavabit.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import curses
import os
import pwd
import socket
from os.path import abspath, normpath, join, expanduser, isdir
from ranger.fsobject import Directory
from ranger.container import KeyBuffer, KeyManager, History
from ranger.ext.signal_dispatcher import SignalDispatcher
from ranger.shared import SettingsAware
ALLOWED_CONTEXTS = ('browser', 'pager', 'embedded_pager', 'taskview',
'console')
class Environment(SettingsAware, SignalDispatcher):
"""A collection of data which is relevant for more than
one class.
"""
cwd = None # current directory
copy = None
cmd = None
cut = None
termsize = None
history = None
directories = None
last_search = None
pathway = None
path = None
keybuffer = None
keymanager = None
def __init__(self, path):
SignalDispatcher.__init__(self)
self.path = abspath(expanduser(path))
self._cf = None
self.pathway = ()
self.directories = {}
self.keybuffer = KeyBuffer(None, None)
self.keymanager = KeyManager(self.keybuffer, ALLOWED_CONTEXTS)
self.copy = set()
self.history = History(self.settings.max_history_size)
try:
self.username = pwd.getpwuid(os.geteuid()).pw_name
except:
self.username = 'uid:' + str(os.geteuid())
self.hostname = socket.gethostname()
self.home_path = os.path.expanduser('~')
self.signal_bind('move', self._set_cf_from_signal, priority=0.1,
weak=True)
def _set_cf_from_signal(self, signal):
self._cf = signal.new
def _set_cf(self, value):
if value is not self._cf:
previous = self._cf
self.signal_emit('move', previous=previous, new=value)
def _get_cf(self):
return self._cf
cf = property(_get_cf, _set_cf)
def key_append(self, key):
"""Append a key to the keybuffer"""
# special keys:
if key == curses.KEY_RESIZE:
self.keybuffer.clear()
self.keybuffer.add(key)
def key_clear(self):
"""Clear the keybuffer"""
self.keybuffer.clear()
def at_level(self, level):
"""
Returns the FileSystemObject at the given level.
level >0 => previews
level 0 => current file/directory
level <0 => parent directories
"""
if level <= 0:
try:
return self.pathway[level - 1]
except IndexError:
return None
else:
directory = self.cf
for i in range(level - 1):
if directory is None:
return None
if directory.is_directory:
directory = directory.pointed_obj
else:
return None
try:
return self.directories[directory.path]
except AttributeError:
return None
except KeyError:
return directory
def garbage_collect(self, age):
"""Delete unused directory objects"""
for key in tuple(self.directories):
value = self.directories[key]
if value.is_older_than(age): # and not value in self.pathway:
del self.directories[key]
if value.is_directory:
value.files = None
def get_selection(self):
if self.cwd:
return self.cwd.get_selection()
return set()
def get_directory(self, path):
"""Get the directory object at the given path"""
path = abspath(path)
try:
return self.directories[path]
except KeyError:
obj = Directory(path)
self.directories[path] = obj
return obj
def get_free_space(self, path):
stat = os.statvfs(path)
return stat.f_bavail * stat.f_bsize
def assign_cursor_positions_for_subdirs(self):
"""Assign correct cursor positions for subdirectories"""
last_path = None
for path in reversed(self.pathway):
if last_path is None:
last_path = path
continue
path.move_to_obj(last_path)
last_path = path
def ensure_correct_pointer(self):
if self.cwd:
self.cwd.correct_pointer()
def history_go(self, relative):
"""Move relative in history"""
if self.history:
self.history.move(relative).go()
def enter_dir(self, path, history = True):
"""Enter given path"""
if path is None: return
path = str(path)
previous = self.cwd
# get the absolute path
path = normpath(join(self.path, expanduser(path)))
if not isdir(path):
return False
new_cwd = self.get_directory(path)
try:
os.chdir(path)
except:
return True
self.path = path
self.cwd = new_cwd
self.cwd.load_content_if_outdated()
if self.cwd.files:
for dir in self.cwd.files:
if dir.is_directory and dir.infostring == 'unknown':
dir.determine_infostring()
# build the pathway, a tuple of directory objects which lie
# on the path to the current directory.
if path == '/':
self.pathway = (self.get_directory('/'), )
else:
pathway = []
currentpath = '/'
for dir in path.split('/'):
currentpath = join(currentpath, dir)
pathway.append(self.get_directory(currentpath))
self.pathway = tuple(pathway)
self.assign_cursor_positions_for_subdirs()
# set the current file.
self.cwd.sort_directories_first = self.settings.sort_directories_first
self.cwd.sort_reverse = self.settings.sort_reverse
self.cwd.sort_if_outdated()
self.cf = self.cwd.pointed_obj
if history:
self.history.add(new_cwd)
self.signal_emit('cd', previous=previous, new=self.cwd)
return True
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