From 84bd15607d50636a5fe8fe74bb1ade43a423ae59 Mon Sep 17 00:00:00 2001
From: Sean Whitton <spwhitton@spwhitton.name>
Date: Mon, 30 Mar 2015 17:56:58 +0900
Subject: start code to handle CSV files containing events

---
 src/Utility/EventCache.hs | 59 +++++++++++++++++++++++++++++++++++++++++++++++
 srem.cabal                |  1 +
 2 files changed, 60 insertions(+)
 create mode 100644 src/Utility/EventCache.hs

diff --git a/src/Utility/EventCache.hs b/src/Utility/EventCache.hs
new file mode 100644
index 0000000..6471a0f
--- /dev/null
+++ b/src/Utility/EventCache.hs
@@ -0,0 +1,59 @@
+module EventCache ( purgeOldEventCaches
+                  , appendManualEventCache
+                  , readEmacsEventCache
+                  , readManualEventCache
+                  ) where
+
+import           Control.Applicative ((<$>))
+import qualified Control.SremConfig  as SremConfig
+import           Data.Time.Calendar
+import           Data.Time.Clock
+import           System.Directory    (doesFileExist)
+import           System.FilePath     ((</>))
+import           Types.Reminder
+import           Utility.Emacs
+
+purgeOldEventCaches :: IO [Reminder]
+purgeOldEventCaches = undefined
+
+appendManualEventCache :: IO ()
+appendManualEventCache = do
+    date <- cacheFileDateString
+    dir <- SremConfig.getCacheDirectory
+    let path = dir </> "manual_" ++ date ++ ".csv"
+    undefined
+
+readEmacsEventCache :: IO [Reminder]
+readEmacsEventCache = do
+    date <- cacheFileDateString
+    dir <- SremConfig.getCacheDirectory
+    let path = dir </> "emacs_" ++ date ++ ".csv"
+    doesFileExist path >>= \alreadyThere ->
+        if   alreadyThere
+        then readEventsCSV path
+        else do
+            rems <- parseEmacsOutput <$> getEmacsOutput
+            writeFile path $ makeEventsCSV rems
+            return rems
+
+readManualEventCache :: IO [Reminder]
+readManualEventCache = do
+    date <- cacheFileDateString
+    dir <- SremConfig.getCacheDirectory
+    let path = dir </> "manual_" ++ date ++ ".csv"
+    undefined
+
+readEventsCSV :: FilePath -> IO [Reminder]
+readEventsCSV = undefined
+
+parseEventsCSV :: String -> [Reminder]
+parseEventsCSV = undefined
+
+makeEventsCSV :: [Reminder] -> String
+makeEventsCSV = undefined
+
+cacheFileDateString :: IO String
+cacheFileDateString = showGregorian . utctDay <$> getCurrentTime
+
+-- getEventCacheLock :: IO [Reminder]
+-- getEventCacheLock = undefined
diff --git a/srem.cabal b/srem.cabal
index 6a6654a..371a881 100644
--- a/srem.cabal
+++ b/srem.cabal
@@ -17,6 +17,7 @@ executable srem
                      , process
                      , regex-posix
                      , modular-arithmetic
+                     , time
                      , filepath
   hs-source-dirs:      src
   default-language:    Haskell2010
-- 
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