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Diffstat (limited to 'src/Plugins/Monitors')
| -rw-r--r-- | src/Plugins/Monitors/UVMeter.hs | 150 | 
1 files changed, 150 insertions, 0 deletions
| diff --git a/src/Plugins/Monitors/UVMeter.hs b/src/Plugins/Monitors/UVMeter.hs new file mode 100644 index 0000000..5fa0b82 --- /dev/null +++ b/src/Plugins/Monitors/UVMeter.hs @@ -0,0 +1,150 @@ +{-# 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 Plugins.Monitors.UVMeter where + +import Plugins.Monitors.Common + +import qualified Control.Exception as CE +import Control.Applicative hiding ((<|>),many) +import Network.HTTP +import Text.Read (readMaybe) +import Text.Parsec +import Text.Parsec.String + + +uvConfig :: IO MConfig +uvConfig = mkMConfig +       "<station>" -- template +       ["station"                               -- available replacements +       ] + +data UvInfo = UV { index :: String } +    deriving (Show) + +uvURL :: String +uvURL = "http://www.arpansa.gov.au/uvindex/realtime/xml/uvvalues.xml" + +getData :: IO String +getData = do +    let request = getRequest uvURL +    CE.catch (simpleHTTP request >>= getResponseBody) errHandler +    where errHandler :: CE.IOException -> 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 + +data 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 +    string "<?xml" +    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)) | 
