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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 __future__ import (absolute_import, print_function)
from collections import deque
from subprocess import Popen, PIPE
from time import time, sleep
import math
import os.path
import select
import sys
import errno
from ranger.core.shared import FileManagerAware
from ranger.ext.signals import SignalDispatcher
from ranger.ext.human_readable import human_readable
try:
import chardet # pylint: disable=import-error
HAVE_CHARDET = True
except Exception:
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 Exception:
pass
def destroy(self):
pass
class CopyLoader(Loadable, FileManagerAware): # pylint: disable=too-many-instance-attributes
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 = [fobj.path for fobj 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 Exception:
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))
size_str = " (" + human_readable(self._calculate_size(1)) + ")"
done = 0
if self.do_cut:
self.original_copy_buffer.clear()
if len(self.copy_buffer) == 1:
self.description = "moving: " + self.one_file.path + size_str
else:
self.description = "moving files from: " + self.one_file.dirname + size_str
for fobj in self.copy_buffer:
for path in self.fm.tags.tags:
if path == fobj.path or str(path).startswith(fobj.path):
tag = self.fm.tags.tags[path]
self.fm.tags.remove(path)
self.fm.tags.tags[
path.replace(fobj.path, self.original_path + '/' + fobj.basename)
] = tag
self.fm.tags.dump()
n = 0
for n in shutil_g.move(src=fobj.path, dst=self.original_path,
overwrite=self.overwrite):
self.percent = float(done + n) / size * 100.
yield
done += n
else:
if len(self.copy_buffer) == 1:
self.description = "copying: " + self.one_file.path + size_str
else:
self.description = "copying files from: " + self.one_file.dirname + size_str
for fobj in self.copy_buffer:
if os.path.isdir(fobj.path) and not os.path.islink(fobj.path):
n = 0
for n in shutil_g.copytree(
src=fobj.path,
dst=os.path.join(self.original_path, fobj.basename),
symlinks=True,
overwrite=self.overwrite,
):
self.percent = float(done + n) / size * 100.
yield
done += n
else:
n = 0
for n in shutil_g.copy2(fobj.path, self.original_path,
symlinks=True, overwrite=self.overwrite):
self.percent = float(done + n) / size * 100.
yield
done += n
cwd = self.fm.get_directory(self.original_path)
cwd.load_content()
class CommandLoader( # pylint: disable=too-many-instance-attributes
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, # pylint: disable=too-many-arguments
silent=False, read=False, input=None, # pylint: disable=redefined-builtin
kill_on_pause=False, popenArgs=None):
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
self.popenArgs = popenArgs # pylint: disable=invalid-name
def generate(self): # pylint: disable=too-many-branches,too-many-statements
py3 = sys.version_info[0] >= 3
popenargs = {} if self.popenArgs is None else self.popenArgs
popenargs['stdout'] = popenargs['stderr'] = PIPE
popenargs['stdin'] = PIPE if self.input else open(os.devnull, 'r')
self.process = process = Popen(self.args, **popenargs)
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 ex:
if ex.errno != errno.EPIPE and ex.errno != errno.EINVAL:
raise
stdin.close()
if self.silent and not self.read: # pylint: disable=too-many-nested-blocks
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:
robjs, _, _ = select.select(selectlist, [], [], 0.03)
if robjs:
robjs = robjs[0]
if robjs == process.stderr:
read = robjs.readline()
if py3:
read = safeDecode(read)
if read:
self.fm.notify(read, bad=True)
elif robjs == process.stdout:
read = robjs.read(512)
if py3:
read = safeDecode(read)
if read:
self.stdout_buffer += read
except select.error:
sleep(0.03)
if not self.silent:
for line in process.stderr:
if py3:
line = safeDecode(line)
self.fm.notify(line, 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 Exception:
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 Exception:
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): # pylint: disable=invalid-name
try:
return string.decode("utf-8")
except UnicodeDecodeError:
if HAVE_CHARDET:
codec = chardet.detect(string)["encoding"]
return string.decode(codec, 'ignore')
return ""
class Loader(FileManagerAware):
"""
The Manager of 'Loadable' objects, referenced as fm.loader
"""
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
self.status = 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, append=False):
"""Add an object to the queue.
It should have a load_generator method.
If the argument "append" is True, the queued object will be processed
last, not first.
"""
while obj in self.queue:
self.queue.remove(obj)
if append:
self.queue.append(obj)
else:
self.queue.appendleft(obj)
self.fm.signal_emit("loader.before", loadable=obj, fm=self.fm)
if self.paused:
obj.pause()
else:
obj.unpause()
def move(self, pos_src, pos_dest):
try:
item = self.queue[pos_src]
except IndexError:
return
del self.queue[pos_src]
if pos_dest == 0:
self.queue.appendleft(item)
if pos_src != 0:
self.queue[1].pause()
elif pos_dest == -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()
self.fm.signal_emit("loader.destroy", loadable=item, fm=self.fm)
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)
self.fm.signal_emit("loader.after", loadable=item, fm=self.fm)
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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