84 lines
2.9 KiB
Haskell
84 lines
2.9 KiB
Haskell
-- a data model
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module Types where
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import Text.Printf
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data Ledger = Ledger {
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modifier_entries :: [ModifierEntry],
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periodic_entries :: [PeriodicEntry],
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entries :: [Entry]
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} deriving (Eq)
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data ModifierEntry = ModifierEntry { -- aka automated entry
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valueexpr :: String,
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m_transactions :: [Transaction]
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} deriving (Eq)
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data PeriodicEntry = PeriodicEntry {
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periodexpr :: String,
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p_transactions :: [Transaction]
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} deriving (Eq)
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data Entry = Entry {
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date :: Date,
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status :: Bool,
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code :: String,
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description :: String,
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transactions :: [Transaction]
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} deriving (Eq)
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data Transaction = Transaction {
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account :: Account,
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amount :: Amount
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} deriving (Eq)
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data Amount = Amount {
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currency :: String,
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quantity :: Float
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} deriving (Eq)
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type Date = String
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type Account = String
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-- show methods
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instance Show Ledger where
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show l = "Ledger with " ++ m ++ " modifier, " ++ p ++ " periodic, " ++ e ++ " normal entries:\n"
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++ (concat $ map show (modifier_entries l))
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++ (concat $ map show (periodic_entries l))
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++ (concat $ map show (entries l))
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where
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m = show $ length $ modifier_entries l
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p = show $ length $ periodic_entries l
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e = show $ length $ entries l
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instance Show ModifierEntry where
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show e = "= " ++ (valueexpr e) ++ "\n" ++ unlines (map show (m_transactions e))
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instance Show PeriodicEntry where
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show e = "~ " ++ (periodexpr e) ++ "\n" ++ unlines (map show (p_transactions e))
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instance Show Entry where show = showEntry2
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showEntry1 e = date e ++ " " ++ s ++ c ++ d ++ "\n" ++ unlines (map show (transactions e))
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where
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d = description e
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s = case (status e) of {True -> "* "; False -> ""}
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c = case (length(code e) > 0) of {True -> (code e ++ " "); False -> ""}
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dateWidth = 10
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descWidth = 20
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acctWidth = 25
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amtWidth = 11
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showEntry2 e =
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unlines (
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[printf "%-10s %-20s " (date e) (take 20 $ description e)
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++ (show $ head $ transactions e)]
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++ map ((printf (take 32 (repeat ' ')) ++) . show) (tail $ transactions e))
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instance Show Transaction where
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show t = printf "%-25s %8.2s %8.2s" (take 25 $ account t) (show $ amount t) (show 0)
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instance Show Amount where show a = (currency a) ++ (show $ quantity a)
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-- more display methods
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printRegister :: Ledger -> IO ()
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printRegister l = do
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putStr $ concat $ map show $ entries l
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