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hledger.hs

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+-- ledger-compatible money management tools
+-- (c) 2007 Simon Michael & contributors, released under GPL v3 or later
+
+import Control.Exception (assert)
+
+-- data model
+type Date = String
+type Account = String
+type Money = Float
+-- a transaction records a movement of money between two accounts
+data Transaction = Transaction {
+                                date :: Date,
+                                account :: Account,       -- debit this
+                                other_account :: Account, -- credit this
+                                description :: String,
+                                amount :: Money
+                               }
+
+-- sample data
+t1 = Transaction "2007-01-01" "checking" "food" "joe's diner" 8.50
+
+-- tests
+main = do
+  assert_ $ amount t1 == 8.50
+  putStrLn "ok"
+    where assert_ e = assert e return ()