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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
"""
import os
import sys
import time
import threading
import tempfile
import subprocess
import Constants
class ExternalEditor(threading.Thread):
def __init__(self, name, value, callback):
threading.Thread.__init__(self)
self.daemon = True
self._stop_event = threading.Event()
self.callback = callback
self.tempfile = self._create_tempfile(name, value)
def _create_tempfile(self, name, value):
fp = tempfile.NamedTemporaryFile(mode='w', suffix='.py',
prefix=name + '_')
fp.write(value)
fp.flush()
return fp
@property
def filename(self):
return self.tempfile.name
def open_editor(self):
proc = subprocess.Popen(
args=(Constants.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) as fp:
data = fp.read()
self.callback(data)
time.sleep(1)
except Exception as e:
print >> sys.stderr, "file monitor crashed:", str(e)
else:
# print "file monitor: done with", filename
pass
if __name__ == '__main__':
def p(data):
print data
Constants.EDITOR = '/usr/bin/gedit'
editor = ExternalEditor("test", "content", p)
editor.open_editor()
editor.start()
time.sleep(15)
editor.stop()
editor.join()
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