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# -*- python -*-
'''
xpybar – xmobar replacement written in python
Copyright © 2014, 2015, 2016 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 util import *
class Weather:
'''
Weather monitor
@variable icao:str The station's International Civil Aviation Organization airport code
@variable station:str The station as a human readable, not necessarily only the airport name
@variable location:str Human readable location, country or state (abbreviated) and country.
@variable latitude:float The latitude position of the station, in degrees to north with two decimals
@variable longitude:float The longitude position of the station, in degrees to east with two decimals
@variable headers:list<str> Headers in the decoded metar data
@variable fields:dict<str, str> Fields in the decoded metar data
@variable time:(int, int, int) The time observation was made: day of month, hour and minute, in UTC
The following will be `None` if not found in the data, but it is probably found if it should not be `None`.
They can be floating point, but are most often integers.
@variable wind_dir:float? The wind direction, `None` if variable
@variable wind_speed:float The wind speed in knots
@variable wind_gusts:float? The wind gusts (variability of the wind speed) in knots
@variable wind_var:(float, float)? The wind direction range, `None` if less than 60° variation
@variable temp:float The temperature in °C
@variable dew:float The dew point in °C
@variable pressure:flaot The pressure in hPa
@variable visibility:float The visibility in statute miles
'''
def __init__(self, station = None):
'''
Constructor
@param station:str? The station's ICAO code (International Civil Aviation Organization airport code),
if `None`, ~/.config/metar or /etc/metar will be used (see metar(1))
'''
import os, pwd
if station is None:
try:
filename = os.environ['HOME'] if 'HOME' in os.environ else ''
if len(filename) == 0:
filename = pwd.getpwuid(os.getuid()).pw_dir
filename = '%s/.config/metar' % filename
if not os.path.isfile(filename):
filename = '/etc/metar'
except:
filename = '/etc/metar'
with open(filename, 'rb') as file:
station = file.read()
station = station.decode('utf-8', 'strict').split('\n')[0]
self.icao = station
url = 'http://weather.noaa.gov/pub/data/observations/metar/decoded/%s.TXT' % station
decoded = spawn_read('curl', url).split('\n')
# How to parse: http://www.wunderground.com/metarFAQ.asp
station_header, self.headers, decoded = decoded[0].split(', '), decoded[:2], decoded[2:]
self.station, station_header = station_header[0], ', '.join(station_header[1:])
self.location = station_header.split(' (')[0]
self.latitude, self.longitude = station_header.split(') ')[1].split(' ')[:2]
self.latitude, ysign = self.latitude[:-1], self.latitude[-1] == 'S'
self.longitude, xsign = self.longitude[:-1], self.longitude[-1] == 'W'
self.latitude = [float(x) for x in self.latitude.split('-')]
self.longitude = [float(x) for x in self.longitude.split('-')]
self.latitude = self.latitude[0] + self.latitude[1] / 100
self.longitude = self.longitude[0] + self.longitude[1] / 100
self.latitude = -(self.latitude) if ysign else self.latitude
self.longitude = -(self.longitude) if xsign else self.longitude
self.fields = {}
for line in decoded:
line = line.split(': ')
self.fields[line[0]] = ': '.join(line[1:])
self.wind_dir, self.wind_speed, self.wind_gusts, self.wind_var = None, None, None, None
self.temp, self.dew, self.pressure, self.visibility = None, None, None, None
for ob in self.fields['ob'].split(' ')[1:]:
self.__time(ob)
self.__wind(ob)
self.__wind_var(ob)
self.__temp(ob)
self.__pressure(ob)
self.__visibility(ob)
# (-SHRA)-Present Weather and Obscurations from http://www.wunderground.com/metarFAQ.asp (p44)
# BKN070-Sky Condition from http://www.wunderground.com/metarFAQ.asp
# (p46, p49, p59(7,8,9). p61-65, p67-77, p91+96)
#Wind: from the N (010 degrees) at 18 MPH (16 KT):0
#Visibility: 3 mile(s):0
#Sky conditions: overcast
#Weather: precipitation
#Precipitation last hour: A trace -- sometimes
#Temperature: 10.0 F (-12.2 C)
#Windchill: -7 F (-22 C):2 -- sometimes
#Dew Point: 3.9 F (-15.6 C)
#Relative Humidity: 75%
#Pressure (altimeter): 30.19 in. Hg (1022 hPa)
def __time(self, ob):
ob_ = list(filter(lambda c : not ('0' <= c <= '9'), ob))
if (len(ob_) == 1) and ob.endswith('Z'):
self.time = (ob[0 : 2], ob[2 : 4], ob[4 : 6])
def __wind(self, ob):
if ob.endswith('KT'):
self.wind_dir = None if ob.startswith('VRB') else float(ob[:3])
ob = ob[3:]
i = ob.find('G') if 'G' in ob else ob.find('K')
self.wind_speed, ob = float(ob[:i]), ob[i:]
self.wind_gusts = float(ob[1 : -2]) if ob[0] == 'G' else None
def __wind_var(self, ob):
if (len(ob) == 7) and (ob[3] == 'V'):
if len(list(filter(lambda c : not ('0' <= c <= '9'), ob))) == 1:
self.wind_dir = (float(ob[:3]), float(ob[-3:]))
def __temp(self, ob):
if '/' in ob:
ob = ob.replace('M', '-')
if len(list(filter(lambda c : not ('0' <= c <= '9'), ob.replace('-', '0')))) == 1:
(self.temp, self.dew) = [float(x) for x in ob.split('/')]
def __pressure(self, ob):
if (len(ob) == 5) and (ob[0] in ['Q', 'A']):
if len(list(filter(lambda c : not ('0' <= c <= '9'), ob))) == 1:
if ob[0] == 'Q':
self.pressure = float(ob[1:])
else:
self.pressure = 33.86 * float(ob[1:]) / 100
def __visibility(self, ob):
# TODO p61
if ob.endswith('SM') and (len(ob) > 0):
if len(list(filter(lambda c : not ('0' <= c <= '9'), ob))) == 2:
self.visibility = float(ob[:-2])
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