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# This file is part of ranger, the console file manager.
# License: GNU GPL version 3, see the file "AUTHORS" for details.
from collections import deque
from time import time, sleep
from subprocess import Popen, PIPE
from ranger.core.shared import FileManagerAware
from ranger.ext.signals import SignalDispatcher
import math
import os.path
import sys
import select
try:
import chardet
HAVE_CHARDET = True
except:
HAVE_CHARDET = False
class Loadable(object):
paused = False
progressbar_supported = False
def __init__(self, gen, descr):
self.load_generator = gen
self.description = descr
self.percent = 0
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 CopyLoader(Loadable, FileManagerAware):
progressbar_supported = True
def __init__(self, copy_buffer, do_cut=False, overwrite=False):
self.copy_buffer = tuple(copy_buffer)
self.do_cut = do_cut
self.original_copy_buffer = copy_buffer
self.original_path = self.fm.thistab.path
self.overwrite = overwrite
self.percent = 0
if self.copy_buffer:
self.one_file = self.copy_buffer[0]
Loadable.__init__(self, self.generate(), 'Calculating size...')
def _calculate_size(self, step):
from os.path import join
size = 0
stack = [f.path for f in self.copy_buffer]
while stack:
fname = stack.pop()
if os.path.islink(fname):
continue
if os.path.isdir(fname):
stack.extend([join(fname, item) for item in os.listdir(fname)])
else:
try:
fstat = os.stat(fname)
except:
continue
size += max(step, math.ceil(fstat.st_size / step) * step)
return size
def generate(self):
from ranger.ext import shutil_generatorized as shutil_g
if self.copy_buffer:
# TODO: Don't calculate size when renaming (needs detection)
bytes_per_tick = shutil_g.BLOCK_SIZE
size = max(1, self._calculate_size(bytes_per_tick))
bar_tick = 100.0 / (float(size) / bytes_per_tick)
if self.do_cut:
self.original_copy_buffer.clear()
if len(self.copy_buffer) == 1:
self.description = "moving: " + self.one_file.path
else:
self.description = "moving files from: " + self.one_file.dirname
for f in self.copy_buffer:
for _ in shutil_g.move(src=f.path,
dst=self.original_path,
overwrite=self.overwrite):
self.percent += bar_tick
yield
else:
if len(self.copy_buffer) == 1:
self.description = "copying: " + self.one_file.path
else:
self.description = "copying files from: " + self.one_file.dirname
for f in self.copy_buffer:
if os.path.isdir(f.path) and not os.path.islink(f.path):
for _ in shutil_g.copytree(src=f.path,
dst=os.path.join(self.original_path, f.basename),
symlinks=True,
overwrite=self.overwrite):
self.percent += bar_tick
yield
else:
for _ in shutil_g.copy2(f.path, self.original_path,
symlinks=True,
overwrite=self.overwrite):
self.percent += bar_tick
yield
cwd = self.fm.get_directory(self.original_path)
cwd.load_content()
class CommandLoader(Loadable, SignalDispatcher, 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
process = None
def __init__(self, args, descr, silent=False, read=False, input=None,
kill_on_pause=False):
SignalDispatcher.__init__(self)
Loadable.__init__(self, self.generate(), descr)
self.args = args
self.silent = silent
self.read = read
self.stdout_buffer = ""
self.input = input
self.kill_on_pause = kill_on_pause
def generate(self):
py3 = sys.version_info[0] >= 3
if self.input:
stdin = PIPE
else:
stdin = open(os.devnull, 'r')
self.process = process = Popen(self.args,
stdout=PIPE, stderr=PIPE, stdin=stdin)
self.signal_emit('before', process=process, loader=self)
if self.input:
if py3:
import io
stdin = io.TextIOWrapper(process.stdin)
else:
stdin = process.stdin
try:
stdin.write(self.input)
except IOError as e:
if e.errno != errno.EPIPE and e.errno != errno.EINVAL:
raise
stdin.close()
if self.silent and not self.read:
while process.poll() is None:
yield
if self.finished:
break
sleep(0.03)
else:
selectlist = []
if self.read:
selectlist.append(process.stdout)
if not self.silent:
selectlist.append(process.stderr)
while process.poll() is None:
yield
if self.finished:
break
try:
rd, _, __ = select.select(selectlist, [], [], 0.03)
if rd:
rd = rd[0]
if rd == process.stderr:
read = rd.readline()
if py3:
read = safeDecode(read)
if read:
self.fm.notify(read, bad=True)
elif rd == process.stdout:
read = rd.read(512)
if py3:
read = safeDecode(read)
if read:
self.stdout_buffer += read
except select.error:
sleep(0.03)
if not self.silent:
for l in process.stderr.readlines():
if py3:
l = safeDecode(l)
self.fm.notify(l, bad=True)
if self.read:
read = process.stdout.read()
if py3:
read = safeDecode(read)
self.stdout_buffer += read
self.finished = True
self.signal_emit('after', process=process, loader=self)
def pause(self):
if not self.finished and not self.paused:
if self.kill_on_pause:
self.finished = True
try:
self.process.kill()
except OSError:
# probably a race condition where the process finished
# between the last poll()ing and this point.
pass
return
try:
self.process.send_signal(20)
except:
pass
Loadable.pause(self)
self.signal_emit('pause', process=self.process, loader=self)
def unpause(self):
if not self.finished and self.paused:
try:
self.process.send_signal(18)
except:
pass
Loadable.unpause(self)
self.signal_emit('unpause', process=self.process, loader=self)
def destroy(self):
self.signal_emit('destroy', process=self.process, loader=self)
if self.process:
try:
self.process.kill()
except OSError:
pass
def safeDecode(string):
try:
return string.decode("utf-8")
except (UnicodeDecodeError):
if HAVE_CHARDET:
return string.decode(chardet.detect(string)["encoding"])
else:
return ""
class Loader(FileManagerAware):
seconds_of_work_time = 0.03
throbber_chars = r'/-\|'
throbber_paused = '#'
paused = False
def __init__(self):
self.queue = deque()
self.item = None
self.load_generator = None
self.throbber_status = 0
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)
if self.paused:
obj.pause()
else:
obj.unpause()
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]
if item.progressbar_supported:
self.fm.ui.status.request_redraw()
def pause(self, state):
"""Change the pause-state to 1 (pause), 0 (no pause) or -1 (toggle)"""
if state == -1:
state = not self.paused
elif state == self.paused:
return
self.paused = state
if not self.queue:
return
if state:
self.queue[0].pause()
else:
self.queue[0].unpause()
def work(self):
"""Load items from the queue if there are any.
Stop after approximately self.seconds_of_work_time.
"""
if self.paused:
self.status = self.throbber_paused
return
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
item.unpause()
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)
if item.progressbar_supported:
self.fm.ui.status.request_redraw()
except StopIteration:
self._remove_current_process(item)
except Exception as err:
self.fm.notify(err)
self._remove_current_process(item)
def _remove_current_process(self, item):
item.load_generator = None
self.queue.remove(item)
if item.progressbar_supported:
self.fm.ui.status.request_redraw()
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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