From 8c663269b4a2981fd35b60dcaad8ba2de9915dc2 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Thu, 12 Jun 2014 17:24:14 -0400
Subject: [PATCH] Add an (un)pickler for the AutoRacingResults earnings
 (unfinished).

---
 src/TSN/Picklers.hs | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/TSN/Picklers.hs b/src/TSN/Picklers.hs
index dc3ed9a..387f4cf 100644
--- a/src/TSN/Picklers.hs
+++ b/src/TSN/Picklers.hs
@@ -4,6 +4,7 @@
 module TSN.Picklers (
   xp_date,
   xp_date_padded,
+  xp_earnings,
   xp_gamedate,
   xp_racedate,
   xp_tba_time,
@@ -12,6 +13,7 @@ module TSN.Picklers (
 where
 
 -- System imports.
+import Data.String.Utils ( replace )
 import Data.Time.Clock ( NominalDiffTime, UTCTime, addUTCTime )
 import Data.Time.Format ( formatTime, parseTime )
 import System.Locale ( defaultTimeLocale )
@@ -76,6 +78,30 @@ xp_date_padded =
     from_date = formatTime defaultTimeLocale date_format_padded
 
 
+-- | Parse \<Earnings\> from an 'AutoRaceResultsListing'. These are
+--   essentially 'Int's, but they look like,
+--
+--   * <Earnings>336,826</Earnings>
+--   * <Earnings>1,000,191</Earnings>
+--   * <Earnings>TBA</Earnings>
+--
+xp_earnings :: PU (Maybe Int)
+xp_earnings =
+  (to_earnings, from_earnings) `xpWrap` xpText
+  where
+    strip_commas :: String -> String
+    strip_commas = replace "," ""
+
+    to_earnings :: String -> Maybe Int
+    to_earnings s
+      | s == "TBA" = Nothing
+      | otherwise = (read . strip_commas . show) s
+
+    from_earnings :: Maybe Int -> String
+    from_earnings Nothing = ""
+    from_earnings (Just i) = show i
+
+
 -- | (Un)pickle a 'UTCTime' from a \<RaceDate\> element in an
 --   'AutoRaceResults' message.
 --
-- 
2.44.2