Add a basic Python code generator.

src/Cdl/Codegen.hs

@@ -0,0 +1,35 @@
+module Cdl.Codegen where
+import Cdl.Cow hiding (dataPoints)
+import Data.Fixed
+import Data.List
+
+standard =
+    [ "from server.fgs.model import *"
+    , "from server.fgs import db"
+    , "import datetime"
+    ]
+
+dataPoint :: DataPoint -> String
+dataPoint (id, Coord{longitude=lo,latitude=la}) =
+    "DataPoint(longitude=" ++ show lo ++
+    ", latitude=" ++ show la ++
+    ", datetime=datetime.now())"
+
+dataPointLine :: DataPoint -> String
+dataPointLine dp = "db.session.add(" ++ dataPoint dp ++ ")"
+
+commitLine :: String
+commitLine = "db.session.commit()"
+
+sleepLine :: Float -> String
+sleepLine f = "sleep(" ++ show f ++ ")"
+
+dataPoints :: [DataPoint] -> [String]
+dataPoints dps = map dataPointLine dps ++ [commitLine]
+
+dataBatches :: Float -> [[DataPoint]] -> [String]
+dataBatches f dbs = intercalate [sleepLine f] $ map dataPoints dbs
+
+outputCow :: String -> Float -> Collar -> IO ()
+outputCow filename f c =
+    writeFile filename $ intercalate "\n" $ standard ++ (dataBatches f $ runCows f [c])