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module Utility.EventCache ( purgeOldEventCaches
, appendManualEventCache
, readEmacsEventCache
, readManualEventCache
) where
import Control.Applicative ((<$>))
import Control.Exception (IOException, catch)
import Control.Monad (filterM, forM_, when)
import qualified Control.SremConfig as SremConfig
import Data.List.Split (splitOn, splitOneOf)
import Data.Maybe.Read
import Data.Time.Calendar
import Data.Time.Clock
import System.Directory (doesFileExist, getDirectoryContents,
removeFile)
import System.FilePath ((</>))
import Types.Reminder
import Utility.Emacs
-- TODO: lockfiles?
-- #### User interface functions
purgeOldEventCaches :: IO ()
purgeOldEventCaches = do
files <- (SremConfig.getCacheDirectory
>>= getDirectoryContents)
`catch` ((\_ -> return []) :: IOException -> IO [FilePath])
today <- utctDay <$> getCurrentTime
forM_ files $ \file ->
when (fileIsOldCache today file) $ removeFile file
appendManualEventCache :: Reminder -> Day -> IO ()
appendManualEventCache r d = do
dir <- SremConfig.getCacheDirectory
let path = dir </> "manual_" ++ (showGregorian d) ++ ".csv"
appendFile path $ makeEventsCSV [r]
readEmacsEventCache :: IO [Reminder]
readEmacsEventCache = do
date <- todaysCacheFileDateString
dir <- SremConfig.getCacheDirectory
let path = dir </> "emacs_" ++ date ++ ".csv"
doesFileExist path >>= \alreadyThere ->
if alreadyThere
then readEventsCSV path
else do
rems <- parseEmacsOutput <$> getEmacsOutput
writeFile path $ makeEventsCSV rems
return rems
readManualEventCache :: IO [Reminder]
readManualEventCache = do
date <- todaysCacheFileDateString
dir <- SremConfig.getCacheDirectory
let path = dir </> "manual_" ++ date ++ ".csv"
doesFileExist path >>= \alreadyThere ->
if alreadyThere
then readEventsCSV path
else return []
-- #### Internal functions
readEventsCSV :: FilePath -> IO [Reminder]
readEventsCSV f = readFile f >>= return . parseEventsCSV
parseEventsCSV :: String -> [Reminder]
parseEventsCSV = foldr step [] . lines
where
step r rs = maybe rs (: rs) $ parseEventCSV r
parseEventCSV :: String -> Maybe Reminder
parseEventCSV line = do
hourString:minuteString:text:[] <- return $ splitOn "," line
hour <- readMaybe hourString
minute <- readMaybe minuteString
makeReminder' hour minute text
makeEventsCSV :: [Reminder] -> String
makeEventsCSV = unlines . foldr ((:) . makeEventCSV) []
makeEventCSV :: Reminder -> String
makeEventCSV r = (show . getReminderHour $ r) ++ "," ++
(show . getReminderMinute $ r) ++ ","
++ getReminderText r
todaysCacheFileDateString :: IO String
todaysCacheFileDateString = showGregorian . utctDay <$> getCurrentTime
fileIsOldCache :: Day -> FilePath -> Bool
fileIsOldCache today file = length splitFile == 3
&& splitFile !! 1 `elem` ["manual", "emacs"]
&& (maybe False (< today) $ readDay $ splitFile !! 2)
&& splitFile !! 3 == "csv"
where
splitFile = splitOneOf "_." file
readDay :: String -> Maybe Day
readDay s = do
yearString:monthString:dayString:[] <- return $ splitOn "-" s
year <- readMaybe yearString
month <- readMaybe monthString
day <- readMaybe dayString
return $ fromGregorian year month day
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