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commodity cleanup

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This commit is contained in:
Simon Michael 2008-10-18 19:30:07 +00:00
parent 9f8e0c42fe
commit 93ced249b3
1 changed files with 12 additions and 14 deletions
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26
Ledger/Commodity.hs
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@ -1,9 +1,9 @@
{-|
A 'Commodity' is a symbol representing a currency or some other kind of
thing we are tracking, and some settings that tell how to display amounts
of the commodity. For the moment, commodities also include a hard-coded
conversion rate relative to the dollar.
thing we are tracking, and some display preferences that tell how to
display 'Amount's of the commodity - is the symbol on the left or right,
are thousands separated by comma, significant decimal places and so on.
-}
module Ledger.Commodity
@ -13,15 +13,13 @@ import Ledger.Utils
import Ledger.Types
-- for nullamt, autoamt, etc.
unknown = Commodity {symbol="",side=L,spaced=False,comma=False,precision=0}
-- convenient amount and commodity constructors, for tests etc.
dollar = Commodity {symbol="$",side=L,spaced=False,comma=False,precision=2}
unknown = Commodity {symbol="", side=L,spaced=False,comma=False,precision=0}
dollar = Commodity {symbol="$", side=L,spaced=False,comma=False,precision=2}
euro = Commodity {symbol="EUR",side=L,spaced=False,comma=False,precision=2}
pound = Commodity {symbol="£",side=L,spaced=False,comma=False,precision=2}
hour = Commodity {symbol="h",side=R,spaced=False,comma=False,precision=1}
pound = Commodity {symbol="£", side=L,spaced=False,comma=False,precision=2}
hour = Commodity {symbol="h", side=R,spaced=False,comma=False,precision=1}
dollars n = Amount dollar n Nothing
euros n = Amount euro n Nothing
@ -30,13 +28,13 @@ hours n = Amount hour n Nothing
defaultcommodities = [dollar, euro, pound, hour, unknown]
defaultcommoditiesmap :: Map.Map String Commodity
defaultcommoditiesmap = Map.fromList [(symbol c :: String, c :: Commodity) | c <- defaultcommodities]
-- | Look up one of the hard-coded default commodities. For use in tests.
comm :: String -> Commodity
comm symbol = Map.findWithDefault (error "commodity lookup failed") symbol defaultcommoditiesmap
comm sym = fromMaybe
(error "commodity lookup failed")
$ find (\(Commodity{symbol=s}) -> s==sym) defaultcommodities
-- | Find the conversion rate between two commodities.
-- | Find the conversion rate between two commodities. Currently returns 1.
conversionRate :: Commodity -> Commodity -> Double
conversionRate oldc newc = 1