summaryrefslogtreecommitdiffhomepage
path: root/src/Xmobar/Plugins/Monitors/Weather.hs
blob: 9c62288fc13415fb8d1b96b2c9e384f8c4396784 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
{-# LANGUAGE CPP #-}
-----------------------------------------------------------------------------
-- |
-- Module      :  Plugins.Monitors.Weather
-- Copyright   :  (c) Andrea Rossato
-- License     :  BSD-style (see LICENSE)
--
-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
-- Stability   :  unstable
-- Portability :  unportable
--
-- A weather monitor for Xmobar
--
-----------------------------------------------------------------------------

module Xmobar.Plugins.Monitors.Weather where

import Xmobar.Plugins.Monitors.Common

import qualified Control.Exception as CE

import qualified Data.ByteString.Lazy.Char8 as B
import Data.Char (toLower)
import Data.Maybe (fromMaybe)
import Network.HTTP.Conduit
import Network.HTTP.Types.Status
import Network.HTTP.Types.Method
import qualified Data.ByteString.Lazy.Char8 as B
import Data.Char (toLower)

import Text.ParserCombinators.Parsec
import System.Console.GetOpt (ArgDescr(ReqArg), OptDescr(Option))


-- | Options the user may specify.
data WeatherOpts = WeatherOpts
  { weatherString :: String
  , useManager    :: Bool
  }

-- | Default values for options.
defaultOpts :: WeatherOpts
defaultOpts = WeatherOpts
  { weatherString = ""
  , useManager    = True
  }

-- | Apply options.
options :: [OptDescr (WeatherOpts -> WeatherOpts)]
options =
  [ Option "w" ["weathers"  ] (ReqArg (\s o -> o { weatherString = s   }) "") ""
  , Option "m" ["useManager"] (ReqArg (\b o -> o { useManager = read b }) "") ""
  ]

weatherConfig :: IO MConfig
weatherConfig = mkMConfig
       "<station>: <tempC>C, rh <rh>% (<hour>)" -- template
       ["station"                               -- available replacements
       , "stationState"
       , "year"
       , "month"
       , "day"
       , "hour"
       , "windCardinal"
       , "windAzimuth"
       , "windMph"
       , "windKnots"
       , "windKmh"
       , "windMs"
       , "visibility"
       , "skyCondition"
       , "skyConditionS"
       , "weather"
       , "tempC"
       , "tempF"
       , "dewPointC"
       , "dewPointF"
       , "rh"
       , "pressure"
       ]

data WindInfo =
    WindInfo {
         windCardinal :: String -- cardinal direction
       , windAzimuth  :: String -- azimuth direction
       , windMph      :: String -- speed (MPH)
       , windKnots    :: String -- speed (knot)
       , windKmh      :: String -- speed (km/h)
       , windMs       :: String -- speed (m/s)
    } deriving (Show)

data WeatherInfo =
    WI { stationPlace :: String
       , stationState :: String
       , year         :: String
       , month        :: String
       , day          :: String
       , hour         :: String
       , windInfo     :: WindInfo
       , visibility   :: String
       , skyCondition :: String
       , weather      :: String
       , tempC        :: Int
       , tempF        :: Int
       , dewPointC    :: Int
       , dewPointF    :: Int
       , humidity     :: Int
       , pressure     :: Int
       } deriving (Show)

pTime :: Parser (String, String, String, String)
pTime = do y <- getNumbersAsString
           char '.'
           m <- getNumbersAsString
           char '.'
           d <- getNumbersAsString
           char ' '
           (h:hh:mi:mimi) <- getNumbersAsString
           char ' '
           return (y, m, d ,h:hh:":"++mi:mimi)

noWind :: WindInfo
noWind = WindInfo "μ" "μ" "0" "0" "0" "0"

pWind :: Parser WindInfo
pWind =
  let tospace = manyTill anyChar (char ' ')
      toKmh knots = knots $* 1.852
      toMs knots  = knots $* 0.514
      ($*) :: String -> Double -> String
      op1 $* op2 = show (round ((read op1::Double) * op2)::Integer)

      -- Occasionally there is no wind and a METAR report gives simply, "Wind: Calm:0"
      wind0 = do manyTill skipRestOfLine (string "Wind: Calm:0")
                 return noWind
      windVar = do manyTill skipRestOfLine (string "Wind: Variable at ")
                   mph <- tospace
                   string "MPH ("
                   knot <- tospace
                   manyTill anyChar newline
                   return $ WindInfo "μ" "μ" mph knot (toKmh knot) (toMs knot)
      wind = do manyTill skipRestOfLine (string "Wind: from the ")
                cardinal <- tospace
                char '('
                azimuth <- tospace
                string "degrees) at "
                mph <- tospace
                string "MPH ("
                knot <- tospace
                manyTill anyChar newline
                return $ WindInfo cardinal azimuth mph knot (toKmh knot) (toMs knot)
  in try wind0 <|> try windVar <|> try wind <|> return noWind

pTemp :: Parser (Int, Int)
pTemp = do let num = digit <|> char '-' <|> char '.'
           f <- manyTill num $ char ' '
           manyTill anyChar $ char '('
           c <- manyTill num $ char ' '
           skipRestOfLine
           return (floor (read c :: Double), floor (read f :: Double))

pRh :: Parser Int
pRh = do s <- manyTill digit (char '%' <|> char '.')
         return $ read s

pPressure :: Parser Int
pPressure = do manyTill anyChar $ char '('
               s <- manyTill digit $ char ' '
               skipRestOfLine
               return $ read s

{-
    example of 'http://weather.noaa.gov/pub/data/observations/metar/decoded/VTUD.TXT':
        Station name not available
        Aug 11, 2013 - 10:00 AM EDT / 2013.08.11 1400 UTC
        Wind: from the N (350 degrees) at 1 MPH (1 KT):0
        Visibility: 4 mile(s):0
        Sky conditions: mostly clear
        Temperature: 77 F (25 C)
        Dew Point: 73 F (23 C)
        Relative Humidity: 88%
        Pressure (altimeter): 29.77 in. Hg (1008 hPa)
        ob: VTUD 111400Z 35001KT 8000 FEW030 25/23 Q1008 A2977 INFO R RWY30
        cycle: 14
-}
parseData :: Parser [WeatherInfo]
parseData =
    do (st, ss) <- try (string "Station name not available" >> return ("??", "??")) <|>
                   (do st <- getAllBut ","
                       space
                       ss <- getAllBut "("
                       return (st, ss)
                   )
       skipRestOfLine >> getAllBut "/"
       (y,m,d,h) <- pTime
       w <- pWind
       v <- getAfterString "Visibility: "
       sk <- getAfterString "Sky conditions: "
       we <- getAfterString "Weather: "
       skipTillString "Temperature: "
       (tC,tF) <- pTemp
       skipTillString "Dew Point: "
       (dC, dF) <- pTemp
       skipTillString "Relative Humidity: "
       rh <- pRh
       skipTillString "Pressure (altimeter): "
       p <- pPressure
       manyTill skipRestOfLine eof
       return [WI st ss y m d h w v sk we tC tF dC dF rh p]

defUrl :: String
defUrl = "https://tgftp.nws.noaa.gov/data/observations/metar/decoded/"

stationUrl :: String -> String
stationUrl station = defUrl ++ station ++ ".TXT"

-- | Get the decoded weather data from the given station.
getData :: Maybe Manager -> String -> IO String
getData weMan station = CE.catch
    (do man <- flip fromMaybe weMan <$> mkManager
        -- Create a new manager if none was present or the user does not want to
        -- use one.
        request <- parseUrlThrow $ stationUrl station
        res <- httpLbs request man
        return $ B.unpack $ responseBody res)
    errHandler
  where
    errHandler :: CE.SomeException -> IO String
    errHandler _ = return "<Could not retrieve data>"

formatSk :: Eq p => [(p, p)] -> p -> p
formatSk ((a,b):sks) sk = if a == sk then b else formatSk sks sk
formatSk [] sk = sk

formatWeather
    :: WeatherOpts        -- ^ Formatting options from the cfg file
    -> [(String,String)]  -- ^ 'SkyConditionS' for 'WeatherX'
    -> [WeatherInfo]      -- ^ The actual weather info
    -> Monitor String
formatWeather opts sks [WI st ss y m d h (WindInfo wc wa wm wk wkh wms) v sk we tC tF dC dF r p] =
    do cel <- showWithColors show tC
       far <- showWithColors show tF
       let sk' = formatSk sks (map toLower sk)
           we' = showWeather (weatherString opts) we
       parseTemplate [st, ss, y, m, d, h, wc, wa, wm, wk, wkh
                     , wms, v, sk, sk', we', cel, far
                     , show dC, show dF, show r , show p ]
formatWeather _ _ _ = getConfigValue naString

-- | Show the 'weather' field with a default string in case it was empty.
showWeather :: String -> String -> String
showWeather "" d = d
showWeather s  _ = s

-- | Start a weather monitor, create a new 'Maybe Manager', should the user have
-- chosen to use one.
startWeather'
    :: [(String, String)]  -- ^ 'SkyConditionS' replacement strings
    -> String              -- ^ Weather station
    -> [String]            -- ^ User supplied arguments
    -> Int                 -- ^ Update rate
    -> (String -> IO ())
    -> IO ()
startWeather' sks station args rate cb = do
    opts  <- parseOptsWith options defaultOpts (getArgvs args)
    weRef <- tryMakeManager opts
    runMD
        (station : args)
        weatherConfig
        (runWeather sks weRef opts)
        rate
        weatherReady
        cb

-- | Same as 'startWeather'', only for 'Weather' instead of 'WeatherX', meaning
-- no 'SkyConditionS'.
startWeather :: String -> [String] -> Int -> (String -> IO ()) -> IO ()
startWeather = startWeather' []

-- | Run a weather monitor.
runWeather
    :: [(String, String)]  -- ^ 'SkyConditionS' replacement strings
    -> Maybe Manager       -- ^ Whether to use a 'Manager'
    -> WeatherOpts         -- ^ Weather specific options
    -> [String]            -- ^ User supplied arguments
    -> Monitor String
runWeather sks weMan opts args = do
    d <- io $ getData weMan (head args)
    i <- io $ runP parseData d
    formatWeather opts sks i

weatherReady :: [String] -> Monitor Bool
weatherReady str = io $ do
    initRequest <- parseUrlThrow $ stationUrl $ head str
    let request = initRequest { method = methodHead }

    CE.catch
        (do man <- mkManager
            res  <- httpLbs request man
            return $ checkResult $ responseStatus res)
        errHandler
  where
    -- | If any exception occurs, indicate that the monitor is not ready.
    errHandler :: CE.SomeException -> IO Bool
    errHandler _ = return False

    -- | Check for and indicate any errors in the http response.
    checkResult :: Status -> Bool
    checkResult status
        | statusIsServerError status = False
        | statusIsClientError status = False
        | otherwise = True

-- | Possibly create a new 'Manager', based upon the users preference.  If one
-- is created, this 'Manager' will be used throughout the monitor.
tryMakeManager :: WeatherOpts -> IO (Maybe Manager)
tryMakeManager opts =
    if useManager opts
        then Just <$> mkManager
        else pure Nothing

-- | Create a new 'Manager' for managing network connections.
mkManager :: IO Manager
mkManager = newManager $ tlsManagerSettings { managerConnCount = 1 }