60 lines
1.6 KiB
Haskell
Executable File
60 lines
1.6 KiB
Haskell
Executable File
#!/usr/bin/env runhaskell
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{-
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generateledger.hs NUMTXNS NUMACCTS ACCTDEPTH
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Outputs a dummy ledger file with the specified number of transactions,
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number of accounts, and account tree depth. Useful for
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testing/profiling/benchmarking.
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-}
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module Main
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where
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import System.Environment
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import Control.Monad
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import Data.Time.LocalTime
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import Data.Time.Calendar
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import Text.Printf
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import Numeric
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main = do
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args <- getArgs
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let [numtxns, numaccts, acctdepth] = map read args :: [Int]
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today <- getCurrentDay
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let (year,_,_) = toGregorian today
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let d = fromGregorian (year-1) 1 1
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let dates = iterate (addDays 1) d
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let accts = pair $ cycle $ take numaccts $ uniqueacctnames acctdepth
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mapM_ (\(n,d,(a,b)) -> putStr $ showtxn n d a b) $ take numtxns $ zip3 [1..] dates accts
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return ()
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showtxn :: Int -> Day -> String -> String -> String
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showtxn txnno date acct1 acct2 =
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printf "%s transaction %d\n %-40s %2d\n %-40s %2d\n\n" d txnno acct1 amt acct2 (-amt)
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where
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d = show date
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amt = 1::Int
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uniqueacctnames :: Int -> [String]
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uniqueacctnames depth = uniqueacctnames' depth uniquenames
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where uniquenames = map hex [1..] where hex = flip showHex ""
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uniqueacctnames' depth uniquenames = group some ++ uniqueacctnames' depth rest
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where (some, rest) = splitAt depth uniquenames
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-- group ["a", "b", "c"] = ["a","a:b","a:b:c"]
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group :: [String] -> [String]
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group [] = []
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group (a:as) = a : map ((a++":")++) (group as)
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pair :: [a] -> [(a,a)]
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pair [] = []
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pair [a] = [(a,a)]
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pair (a:b:rest) = (a,b):pair rest
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getCurrentDay :: IO Day
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getCurrentDay = do
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t <- getZonedTime
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return $ localDay (zonedTimeToLocalTime t)
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