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"""
Copyright 2015 Free Software Foundation, Inc.
This file is part of GNU Radio
GNU Radio Companion 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 2
of the License, or (at your option) any later version.
GNU Radio Companion 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
"""
from __future__ import absolute_import, print_function
import os
import sys
import time
import threading
import tempfile
import subprocess
class ExternalEditor(threading.Thread):
def __init__(self, editor, name, value, callback):
threading.Thread.__init__(self)
self.daemon = True
self._stop_event = threading.Event()
self.editor = editor
self.callback = callback
self.filename = self._create_tempfile(name, value)
def _create_tempfile(self, name, value):
with tempfile.NamedTemporaryFile(
mode='wb', prefix=name + '_', suffix='.py', delete=False,
) as fp:
fp.write(value.encode('utf-8'))
return fp.name
def open_editor(self):
proc = subprocess.Popen(args=(self.editor, self.filename))
proc.poll()
return proc
def stop(self):
self._stop_event.set()
def run(self):
filename = self.filename
# print "file monitor: started for", filename
last_change = os.path.getmtime(filename)
try:
while not self._stop_event.is_set():
mtime = os.path.getmtime(filename)
if mtime > last_change:
# print "file monitor: reload trigger for", filename
last_change = mtime
with open(filename, 'rb') as fp:
data = fp.read().decode('utf-8')
self.callback(data)
time.sleep(1)
except Exception as e:
print("file monitor crashed:", str(e), file=sys.stderr)
finally:
try:
os.remove(self.filename)
except OSError:
pass
if __name__ == '__main__':
e = ExternalEditor('/usr/bin/gedit', "test", "content", print)
e.open_editor()
e.start()
time.sleep(15)
e.stop()
e.join()
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