71 lines
2.1 KiB
Haskell
71 lines
2.1 KiB
Haskell
{-|
|
|
|
|
A 'Commodity' is a symbol representing a currency or some other kind of
|
|
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 Hledger.Data.Commodity
|
|
where
|
|
import Data.List
|
|
import Data.Maybe (fromMaybe)
|
|
import Test.HUnit
|
|
-- import qualified Data.Map as M
|
|
|
|
import Hledger.Data.Types
|
|
import Hledger.Utils
|
|
|
|
|
|
-- characters that may not be used in a non-quoted commodity symbol
|
|
nonsimplecommoditychars = "0123456789-+.@;\n \"{}=" :: String
|
|
|
|
quoteCommoditySymbolIfNeeded s | any (`elem` nonsimplecommoditychars) s = "\"" ++ s ++ "\""
|
|
| otherwise = s
|
|
|
|
commodity = ""
|
|
|
|
-- handy constructors for tests
|
|
-- unknown = commodity
|
|
-- usd = "$"
|
|
-- eur = "€"
|
|
-- gbp = "£"
|
|
-- hour = "h"
|
|
|
|
-- Some sample commodity' names and symbols, for use in tests..
|
|
commoditysymbols =
|
|
[("unknown","")
|
|
,("usd","$")
|
|
,("eur","€")
|
|
,("gbp","£")
|
|
,("hour","h")
|
|
]
|
|
|
|
-- | Look up one of the sample commodities' symbol by name.
|
|
comm :: String -> Commodity
|
|
comm name = snd $ fromMaybe
|
|
(error' "commodity lookup failed")
|
|
(find (\n -> fst n == name) commoditysymbols)
|
|
|
|
-- | Find the conversion rate between two commodities. Currently returns 1.
|
|
conversionRate :: Commodity -> Commodity -> Double
|
|
conversionRate _ _ = 1
|
|
|
|
-- -- | Convert a list of commodities to a map from commodity symbols to
|
|
-- -- unique, display-preference-canonicalised commodities.
|
|
-- canonicaliseCommodities :: [Commodity] -> Map.Map String Commodity
|
|
-- canonicaliseCommodities cs =
|
|
-- Map.fromList [(s,firstc{precision=maxp}) | s <- symbols,
|
|
-- let cs = commoditymap ! s,
|
|
-- let firstc = head cs,
|
|
-- let maxp = maximum $ map precision cs
|
|
-- ]
|
|
-- where
|
|
-- commoditymap = Map.fromList [(s, commoditieswithsymbol s) | s <- symbols]
|
|
-- commoditieswithsymbol s = filter ((s==) . symbol) cs
|
|
-- symbols = nub $ map symbol cs
|
|
|
|
tests_Hledger_Data_Commodity = TestList [
|
|
]
|
|
|