81 lines
2.5 KiB
Haskell
81 lines
2.5 KiB
Haskell
{-|
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A 'Commodity' is a symbol representing a currency or some other kind of
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thing we are tracking, and some display preferences that tell how to
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display 'Amount's of the commodity - is the symbol on the left or right,
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are thousands separated by comma, significant decimal places and so on.
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-}
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{-# LANGUAGE OverloadedStrings #-}
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module Hledger.Data.Commodity
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where
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import Control.Applicative (liftA2)
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import Data.Char (isDigit)
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import Data.List
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import Data.Maybe (fromMaybe)
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import qualified Data.Text as T
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-- import qualified Data.Map as M
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import Hledger.Data.Types
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import Hledger.Utils
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-- Show space-containing commodity symbols quoted, as they are in a journal.
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showCommoditySymbol = textQuoteIfNeeded
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-- characters that may not be used in a non-quoted commodity symbol
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isNonsimpleCommodityChar :: Char -> Bool
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isNonsimpleCommodityChar = liftA2 (||) isDigit isOther
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where
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otherChars = "-+.@*;\t\n \"{}=" :: T.Text
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isOther c = T.any (==c) otherChars
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quoteCommoditySymbolIfNeeded :: T.Text -> T.Text
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quoteCommoditySymbolIfNeeded s
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| T.any isNonsimpleCommodityChar s = "\"" <> s <> "\""
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| otherwise = s
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commodity = ""
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-- handy constructors for tests
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-- unknown = commodity
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-- usd = "$"
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-- eur = "€"
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-- gbp = "£"
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-- hour = "h"
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-- Some sample commodity' names and symbols, for use in tests..
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commoditysymbols =
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[("unknown","")
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,("usd","$")
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,("eur","€")
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,("gbp","£")
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,("hour","h")
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]
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-- | Look up one of the sample commodities' symbol by name.
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comm :: String -> CommoditySymbol
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comm name = snd $ fromMaybe
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(error' "commodity lookup failed") -- PARTIAL:
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(find (\n -> fst n == name) commoditysymbols)
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-- | Find the conversion rate between two commodities. Currently returns 1.
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conversionRate :: CommoditySymbol -> CommoditySymbol -> Double
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conversionRate _ _ = 1
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-- -- | Convert a list of commodities to a map from commodity symbols to
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-- -- unique, display-preference-canonicalised commodities.
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-- canonicaliseCommodities :: [CommoditySymbol] -> Map.Map String CommoditySymbol
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-- canonicaliseCommodities cs =
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-- Map.fromList [(s,firstc{precision=maxp}) | s <- symbols,
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-- let cs = commoditymap ! s,
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-- let firstc = head cs,
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-- let maxp = maximum $ map precision cs
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-- ]
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-- where
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-- commoditymap = Map.fromList [(s, commoditieswithsymbol s) | s <- symbols]
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-- commoditieswithsymbol s = filter ((s==) . symbol) cs
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-- symbols = nub $ map symbol cs
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