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-rw-r--r--src/plugins/leapsec.py134
1 files changed, 134 insertions, 0 deletions
diff --git a/src/plugins/leapsec.py b/src/plugins/leapsec.py
new file mode 100644
index 0000000..f04ad8d
--- /dev/null
+++ b/src/plugins/leapsec.py
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+# -*- python -*-
+'''
+xpybar – xmobar replacement written in python
+Copyright © 2014 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/>.
+'''
+
+import calendar
+
+from util import *
+
+
+class LeapSeconds:
+ '''
+ Leap second announcement monitor
+ '''
+
+
+ PRIMARY = 0
+ '''
+ The leap occurs in a primarily preferred time slot
+ '''
+
+ SECONDARY = 1
+ '''
+ The leap occurs in a secondarily preferred time slot
+ '''
+
+ OUT_OF_BAND = 2
+ '''
+ The leap occurs out of band, not in any preferred time slot
+ '''
+
+
+ def __init__(self):
+ '''
+ Constructor
+ '''
+ url = 'http://maia.usno.navy.mil/ser7/leapsec.dat'
+ announcements = spawn_read('wget', url, '-O', '-')
+ while ' ' in announcements:
+ announcements = announcements.replace(' ', ' ')
+ announcements = announcements.replace('= ', '=').replace('=JD ', '=JD')
+ announcements = [announcement.lstrip().split(' ') for announcement in announcements.split('\n')]
+ test = lambda announcement : announcement.startswith('TAI-UTC=') or announcement.startswith('UTC-TAI=')
+ announcements = [announcement[:3] + list(filter(test, announcement)) for announcement in announcements]
+ MONTHS = { 'JAN' : 1
+ , 'FEB' : 2
+ , 'MAR' : 3
+ , 'APR' : 4
+ , 'MAY' : 5
+ , 'JUN' : 6
+ , 'JUL' : 7
+ , 'AUG' : 8
+ , 'SEP' : 9
+ , 'OCT' : 10
+ , 'NOV' : 11
+ , 'DEC' : 12
+ }
+ DAYS_OF_MONTHS = [-1, 31, 28, 31, 30, 31, 30, 30, 31, 30, 31, 30, 31]
+ def translate(announcement):
+ announcement[0] = int(announcement[0])
+ announcement[1] = MONTHS[announcement[1]]
+ announcement[2] = int(announcement[2]) - 1
+ if announcement[3].startswith('TAI-UTC='):
+ announcement[3] = int(announcement[3].split('=')[1].split('.')[0])
+ else:
+ announcement[3] = -(int(announcement[3].split('=')[1].split('.')[0]))
+ announcement.append(LeapSeconds.OUT_OF_BAND)
+ if announcement[2] == 0:
+ announcement[1] -= 1
+ if announcement[1] == 0:
+ announcement[1] = 12
+ announcement[0] -= 1
+ announcement[2] = DAYS_OF_MONTHS[announcement[1]]
+ if announcement[2] == 2:
+ year = announcement[0]
+ if ((year % 4 == 0) and not (year % 100 == 0)) or (year % 400 == 0):
+ announcement[2] += 1
+ if announcement[1] in (6, 12):
+ announcement[4] = LeapSeconds.PRIMARY
+ elif announcement[1] in (3, 9):
+ announcement[4] = LeapSeconds.SECONDARY
+ return announcement
+ announcements = [translate(announcement) for announcement in announcements]
+ for i in reversed(range(len(announcements) - 1)):
+ announcements[i + 1][3] -= announcements[i][3]
+ self.announcements = announcements[1:]
+
+
+ def __len__(self):
+ '''
+ Get the number of available leap second announcements
+
+ @return The number of available leap second announcements
+ '''
+ return len(self.announcements)
+
+
+ def __getitem__(self, index):
+ '''
+ Get a leap second announcement
+
+ @param index:int? The index of the announcement, negative for reversed chronological indexing
+ @return :(year:int, The year the leap second will occur or occurred (UTC)
+ month:int, The month [1, 12] the leap second will occur or occurred (UTC)
+ day:int, The day [1, 31] the leap second will occur or occurred (UTC)
+ posix:int, The POSIX timestamp the leap will occur or occurred.
+ Keep in mind that POSIX time does not have leap seconds;
+ if `amount == 1` then this time will represent 00:00:00 at
+ the day directly after the day described by (`year`, `month`, `day`)
+ amount:int, The number of leap seconds introduced, can be negative but not zero
+ annon:int) Annonouncement class, either of:
+ LeapSeconds.PRIMARY, LeapSeconds.SECONDARY, LeapSeconds.OUT_OF_BAND
+ '''
+ (y, m, d, a, t) = self.announcements[index]
+ s = 24 * 60 * 60 + a - 1
+ if a > 0:
+ s += 1
+ s = calendar.timegm((y, m, d, 0, 0, s))
+ return (y, m, d, s, a, t)
+