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|
{-# LANGUAGE QuasiQuotes #-}
module Main
( main
) where
import Control.Monad (when)
import Data.Maybe (fromMaybe)
import Data.Version (showVersion)
import System.Environment (getArgs)
import System.Exit (die)
import Data.Aeson (eitherDecode, encode)
import qualified Data.ByteString.Lazy as L
import qualified Data.HashMap.Strict as HM
import System.Console.Docopt.NoTH
(isPresent, longOption, parseArgsOrExit, parseUsageOrExit, usage)
import Text.InterpolatedString.Perl6 (qc)
import Malodivo.Budget (manyToManyLimited)
import Malodivo.Types.District (di2df)
import Malodivo.Types.Ministry (mi2ml)
import qualified Main.Input as I
import qualified Main.Output as O
import Paths_malodivo (version) -- from cabal
usageHelp :: String
usageHelp =
"malodivo " ++
showVersion version ++
" - budget planning tool for the Kingdom of Malodivo" ++
[qc|
This utility reads input JSON data from standard input
and writes output JSON data to standard output.
Usage: malodivo [options] < input.json > output.json
Options:
-h, --help Show this message and exit
|]
process :: IO ()
process = do
input <- L.getContents
case eitherDecode input of
Left err -> die err
Right si ->
let allBills = I.bills si
suppliedFunds = di2df $ I.districts si
ministryLimits = mi2ml $ fromMaybe [] (I.ministries si)
in do when (HM.null suppliedFunds) $ die "We needs at least one district"
L.putStr . encode . O.encode $
manyToManyLimited suppliedFunds ministryLimits allBills
main :: IO ()
main = do
doco <- parseUsageOrExit usageHelp
args <- parseArgsOrExit doco =<< getArgs
if args `isPresent` longOption "help"
then putStrLn $ usage doco
else process
|
