mirror of
https://github.com/simonmichael/hledger.git
synced 2024-09-20 10:47:29 +03:00
82 lines
2.4 KiB
Haskell
82 lines
2.4 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.
|
|
|
|
-}
|
|
|
|
{-# LANGUAGE OverloadedStrings #-}
|
|
{-# LANGUAGE CPP #-}
|
|
|
|
module Hledger.Data.Commodity
|
|
where
|
|
import Data.Char (isDigit)
|
|
import Data.List
|
|
import Data.Maybe (fromMaybe)
|
|
#if !(MIN_VERSION_base(4,11,0))
|
|
import Data.Monoid
|
|
#endif
|
|
import qualified Data.Text as T
|
|
-- 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 \"{}=" :: [Char]
|
|
|
|
isNonsimpleCommodityChar :: Char -> Bool
|
|
isNonsimpleCommodityChar c = isDigit c || c `textElem` otherChars
|
|
where
|
|
otherChars = "-+.@*;\n \"{}=" :: T.Text
|
|
textElem = T.any . (==)
|
|
|
|
quoteCommoditySymbolIfNeeded s | T.any (isNonsimpleCommodityChar) 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 -> CommoditySymbol
|
|
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 :: CommoditySymbol -> CommoditySymbol -> Double
|
|
conversionRate _ _ = 1
|
|
|
|
-- -- | Convert a list of commodities to a map from commodity symbols to
|
|
-- -- unique, display-preference-canonicalised commodities.
|
|
-- canonicaliseCommodities :: [CommoditySymbol] -> Map.Map String CommoditySymbol
|
|
-- 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
|
|
|