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# Copyright (C) 2009, 2010, 2011 Roman Zimbelmann <romanz@lavabit.com>
# This software is distributed under the terms of the GNU GPL version 3.
import curses
import os
import pwd
import socket
from os.path import abspath, normpath, join, expanduser, isdir
from ranger.fsobject import Directory
from ranger.ext.keybinding_parser import KeyBuffer, KeyMaps
from ranger.container.history import History
from ranger.ext.signals import SignalDispatcher
from ranger.core.shared import SettingsAware
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
def __init__(self, path):
SignalDispatcher.__init__(self)
self.path = abspath(expanduser(path))
self._cf = None
self.pathway = ()
self.directories = {}
self.keybuffer = KeyBuffer()
self.keymaps = KeyMaps(self.keybuffer)
self.copy = set()
self.history = History(self.settings.max_history_size, unique=False)
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, tabs):
"""Delete unused directory objects"""
for key in tuple(self.directories):
value = self.directories[key]
if age != -1:
if not value.is_older_than(age) or value in self.pathway:
continue
if value in tabs.values():
continue
del self.directories[key]
if value.is_directory:
value.files = None
self.settings.signal_garbage_collect()
self.signal_garbage_collect()
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(history=False)
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()
# 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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