21 lines
667 B
Haskell
21 lines
667 B
Haskell
{- numbers for humans
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-
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- Copyright 2012-2013 Joey Hess <id@joeyh.name>
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-
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- License: BSD-2-clause
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-}
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module Utility.HumanNumber where
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{- Displays a fractional value as a string with a limited number
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- of decimal digits. -}
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showImprecise :: RealFrac a => Int -> a -> String
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showImprecise precision n
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| precision == 0 || remainder == 0 = show (round n :: Integer)
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| otherwise = show int ++ "." ++ striptrailing0s (pad0s $ show remainder)
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where
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int :: Integer
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(int, frac) = properFraction n
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remainder = round (frac * 10 ^ precision) :: Integer
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pad0s s = replicate (precision - length s) '0' ++ s
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striptrailing0s = reverse . dropWhile (== '0') . reverse
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