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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/>.
from collections import deque
from time import time, sleep
from subprocess import Popen, PIPE
from time import time
from ranger.shared import FileManagerAware
import math
import os
import select
class Loadable(object):
paused = False
def __init__(self, gen, descr):
self.load_generator = gen
self.description = descr
def get_description(self):
return self.description
def pause(self):
self.paused = True
def unpause(self):
try:
del self.paused
except:
pass
def destroy(self):
pass
class CommandLoader(Loadable, FileManagerAware):
"""
Run an external command with the loader.
Output from stderr will be reported. Ensure that the process doesn't
ever ask for input, otherwise the loader will be blocked until this
object is removed from the queue (type ^C in ranger)
"""
finished = False
def __init__(self, args, descr, begin_hook=None, end_hook=None):
Loadable.__init__(self, self.generate(), descr)
self.args = args
self.begin_hook = begin_hook
self.end_hook = end_hook
def generate(self):
self.process = process = Popen(self.args,
stdout=open(os.devnull, 'w'),
stderr=PIPE)
if self.begin_hook:
self.begin_hook(process)
while process.poll() is None:
try:
rd, _, __ = select.select(
[process.stderr], [], [], 0.05)
if rd:
error = process.stderr.readline().decode('utf-8')
self.fm.notify(error, bad=True)
except select.error:
pass
sleep(0.02)
yield
self.finished = True
if self.end_hook:
self.end_hook(process)
def pause(self):
if not self.finished and not self.paused:
self.process.send_signal(20)
Loadable.pause(self)
def unpause(self):
if not self.finished and self.paused:
self.process.send_signal(18)
Loadable.unpause(self)
def destroy(self):
if self.process:
self.process.kill()
class Loader(FileManagerAware):
seconds_of_work_time = 0.03
throbber_chars = r'/-\|'
def __init__(self):
self.queue = deque()
self.item = None
self.load_generator = None
self.throbber_status = 0
self.status_generator = status_generator()
self.rotate()
self.old_item = None
def rotate(self):
"""Rotate the throbber"""
# TODO: move all throbber logic to UI
self.throbber_status = \
(self.throbber_status + 1) % len(self.throbber_chars)
self.status = self.throbber_chars[self.throbber_status]
def add(self, obj):
"""
Add an object to the queue.
It should have a load_generator method.
"""
while obj in self.queue:
self.queue.remove(obj)
self.queue.appendleft(obj)
def move(self, _from, to):
try:
item = self.queue[_from]
except IndexError:
return
del self.queue[_from]
if to == 0:
self.queue.appendleft(item)
if _from != 0:
self.queue[1].pause()
elif to == -1:
self.queue.append(item)
else:
raise NotImplementedError
def remove(self, item=None, index=None):
if item is not None and index is None:
for i, test in enumerate(self.queue):
if test == item:
index = i
break
else:
return
if index is not None:
if item is None:
item = self.queue[index]
if hasattr(item, 'unload'):
item.unload()
item.destroy()
del self.queue[index]
def work(self):
"""
Load items from the queue if there are any.
Stop after approximately self.seconds_of_work_time.
"""
while True:
# get the first item with a proper load_generator
try:
item = self.queue[0]
if item.load_generator is None:
self.queue.popleft()
else:
break
except IndexError:
return
self.rotate()
if item != self.old_item:
if self.old_item:
self.old_item.pause()
self.old_item = item
item.unpause()
end_time = time() + self.seconds_of_work_time
try:
while time() < end_time:
next(item.load_generator)
except StopIteration:
item.load_generator = None
self.queue.remove(item)
except Exception as err:
self.fm.notify(err)
def has_work(self):
"""Is there anything to load?"""
return bool(self.queue)
def destroy(self):
while self.queue:
self.queue.pop().destroy()
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