partial implemention of weather monitoring

Signed-off-by: Mattias Andrée <maandree@operamail.com>

2 files changed, 141 insertions, 1 deletions

diff --git a/TODO b/TODO
index f921b7d..34a8a39 100644
--- a/TODO
+++ b/TODO
@@ -3,7 +3,6 @@ List of plugins to implement:
      iostat [-x] [-d] [-c] [-N] -yzk [-p | <devices>...] <interval>
      SMART monitoring
      Solar position
-     Weather
      Network usage
      CPU usage
      Current CPU speed
diff --git a/src/plugins/weather.py b/src/plugins/weather.py
new file mode 100644
index 0000000..58d12ad
--- /dev/null
+++ b/src/plugins/weather.py
@@ -0,0 +1,141 @@
+# -*- 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/>.
+'''
+
+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 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):
+        '''
+        Constructor
+        
+        @param  station:str  The station's ICAO code (International Civil Aviation Organization airport code)
+        '''
+        self.icao = station
+        url = 'http://weather.noaa.gov/pub/data/observations/metar/decoded/%s.TXT' % station
+        decoded = spawn_read('wget', url, '-O', '-').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(') ').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
+            # BKN070-Sky Condition                      from  http://www.wunderground.com/metarFAQ.asp
+        
+        #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:]
+            if self.wind_dir is not None:
+                ob = '0' + ob
+            self.wind_speed, ob = float(ob[:3]), wind[3:]
+            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):
+        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])
+