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Diffstat (limited to 'src/Xmobar/Plugins/Monitors/UVMeter.hs')
-rw-r--r-- | src/Xmobar/Plugins/Monitors/UVMeter.hs | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/src/Xmobar/Plugins/Monitors/UVMeter.hs b/src/Xmobar/Plugins/Monitors/UVMeter.hs new file mode 100644 index 0000000..079177f --- /dev/null +++ b/src/Xmobar/Plugins/Monitors/UVMeter.hs @@ -0,0 +1,157 @@ +{-# LANGUAGE OverloadedStrings #-} +----------------------------------------------------------------------------- +-- | +-- Module : Plugins.Monitors.UVMeter +-- Copyright : (c) Róman Joost +-- License : BSD-style (see LICENSE) +-- +-- Maintainer : Róman Joost +-- Stability : unstable +-- Portability : unportable +-- +-- An australian uv monitor for Xmobar +-- +----------------------------------------------------------------------------- + +module Xmobar.Plugins.Monitors.UVMeter where + +import Xmobar.Plugins.Monitors.Common + +import qualified Control.Exception as CE +import Network.HTTP.Conduit + (parseRequest, newManager, tlsManagerSettings, httpLbs, + responseBody) +import Data.ByteString.Lazy.Char8 as B +import Text.Read (readMaybe) +import Text.Parsec +import Text.Parsec.String +import Control.Monad (void) + + +uvConfig :: IO MConfig +uvConfig = mkMConfig + "<station>" -- template + ["station" -- available replacements + ] + +newtype UvInfo = UV { index :: String } + deriving (Show) + +uvURL :: String +uvURL = "https://uvdata.arpansa.gov.au/xml/uvvalues.xml" + +getData :: IO String +getData = + CE.catch (do request <- parseRequest uvURL + manager <- newManager tlsManagerSettings + res <- httpLbs request manager + return $ B.unpack $ responseBody res) + errHandler + where errHandler + :: CE.SomeException -> IO String + errHandler _ = return "<Could not retrieve data>" + +textToXMLDocument :: String -> Either ParseError [XML] +textToXMLDocument = parse document "" + +formatUVRating :: Maybe Float -> Monitor String +formatUVRating Nothing = getConfigValue naString +formatUVRating (Just x) = do + uv <- showWithColors show x + parseTemplate [uv] + +getUVRating :: String -> [XML] -> Maybe Float +getUVRating locID (Element "stations" _ y:_) = getUVRating locID y +getUVRating locID (Element "location" [Attribute attr] ys:xs) + | locID == snd attr = getUVRating locID ys + | otherwise = getUVRating locID xs +getUVRating _ (Element "index" [] [Body rate]:_) = readMaybe rate +getUVRating locID (_:xs) = getUVRating locID xs +getUVRating _ [] = Nothing + + +runUVMeter :: [String] -> Monitor String +runUVMeter [] = return "N.A." +runUVMeter (s:_) = do + resp <- io getData + case textToXMLDocument resp of + Right doc -> formatUVRating (getUVRating s doc) + Left _ -> getConfigValue naString + +-- | XML Parsing code comes here. +-- This is a very simple XML parser to just deal with the uvvalues.xml +-- provided by ARPANSA. If you work on a new plugin which needs an XML +-- parser perhaps consider using a real XML parser and refactor this +-- plug-in to us it as well. +-- +-- Note: This parser can not deal with short tags. +-- +-- Kudos to: Charlie Harvey for his article about writing an XML Parser +-- with Parsec. +-- + +type AttrName = String +type AttrValue = String + +newtype Attribute = Attribute (AttrName, AttrValue) + deriving (Show) + +data XML = Element String [Attribute] [XML] + | Decl String + | Body String + deriving (Show) + +-- | parse the document +-- +document :: Parser [XML] +document = do + spaces + y <- try xmlDecl <|> tag + spaces + x <- many tag + spaces + return (y : x) + +-- | parse any tags +-- +tag :: Parser XML +tag = do + char '<' + spaces + name <- many (letter <|> digit) + spaces + attr <- many attribute + spaces + string ">" + eBody <- many elementBody + endTag name + spaces + return (Element name attr eBody) + +xmlDecl :: Parser XML +xmlDecl = do + void $ manyTill anyToken (string "<?xml") -- ignore the byte order mark + decl <- many (noneOf "?>") + string "?>" + return (Decl decl) + +elementBody :: Parser XML +elementBody = spaces *> try tag <|> text + +endTag :: String -> Parser String +endTag str = string "</" *> string str <* char '>' + +text :: Parser XML +text = Body <$> many1 (noneOf "><") + +attribute :: Parser Attribute +attribute = do + name <- many (noneOf "= />") + spaces + char '=' + spaces + char '"' + value <- many (noneOf "\"") + char '"' + spaces + return (Attribute (name, value)) |