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# -*- python -*-
'''
xpybar – xmobar replacement written in python
Copyright © 2014, 2015 Mattias Andrée (maandree@member.fsf.org)
This program 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 3 of the License, or
(at your option) any later version.
This program 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, see <http://www.gnu.org/licenses/>.
'''
from datetime import datetime
from pytz import timezone as tz
import time
class TZClock:
'''
Date and time information retrieval with timezone support
'''
SECONDS = 1
'''
:float Synchronisation value for syncing to seconds
'''
MINUTES = 60
'''
:float Synchronisation value for syncing to minutes
'''
def __init__(self, timezone, format = '%Y-(%m)%b-%d %T, %a w%V, %Z', sync_to = 1):
'''
Constructor
@param timezone:str The timezone
@param format:str The format as in the `date` command
@param sync_to:float The time parameter to sync to, the number of seconds between the reads
'''
self.utc = tz('UTC')
self.timezone = tz(timezone)
self.format = format
self.sync_to = sync_to
def read(self):
'''
Reads the clock
@return :str The time and date in the format specified at construction
'''
return self.from_posix_time(TZClock.posix_time())
def from_posix_time(self, time):
'''
Converts POSIX time into human readable time with the selected timezone
@param time:float The POSIX time
@return :str The time and date in the format specified at construction
'''
return datetime.fromtimestamp(time, tz = self.utc).astimezone(self.timezone).strftime(self.format)
def sync(self):
'''
Wait for the clock to reach the next synchronisation time point
'''
time.sleep(self.sync_to - (time.time() % self.sync_to))
def continuous_sync(self, function):
'''
Wait for the clock to reach the next synchronisation time point
and the call a function and start over, i.e. sync in a loop forever
@param function:()→void The function to call
'''
while True:
time.sleep(self.sync_to - (time.time() % self.sync_to))
function()
@staticmethod
def posix_time():
'''
Returns the current POSIX time
@return :float The current POSIX time
'''
return time.time()
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