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from collections import deque
from time import time
from ranger.shared import FileManagerAware
import math
def status_generator():
"""Generate a rotating line which can be used as a throbber"""
while True:
yield '/'
yield '-'
yield '\\'
yield '|'
class LoadableObject(object):
def __init__(self, gen, descr):
self.load_generator = gen
self.description = descr
def get_description(self):
return self.description
class Loader(FileManagerAware):
seconds_of_work_time = 0.05
def __init__(self):
self.queue = deque()
self.item = None
self.load_generator = None
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.status = next(self.status_generator)
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)
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 test, i in zip(self.queue, range(len(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()
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:
self.old_item = item
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.popleft()
except Exception as err:
self.fm.notify(str(err), bad=True)
def has_work(self):
"""Is there anything to load?"""
return bool(self.queue)
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