104 lines
2.4 KiB
Haskell
104 lines
2.4 KiB
Haskell
{- |
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mtlstats
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Copyright (C) 2019 Rhéal Lamothe
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<rheal.lamothe@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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-}
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module Mtlstats.Format
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( padNum
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, left
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, right
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, centre
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, overlay
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, month
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) where
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-- | Pad an 'Int' with leading zeroes to fit a certain character width
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padNum
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:: Int
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-- ^ The width in characters
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-> Int
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-- ^ The value to format
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-> String
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padNum size n
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| n < 0 = '-' : padNum (pred size) (-n)
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| otherwise = let
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str = show n
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sLen = length str
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pLen = size - sLen
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pad = replicate pLen '0'
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in pad ++ str
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-- | Aligns text to the left within a field (clipping if necessary)
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left
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:: Int
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-- ^ The width of the field
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-> String
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-- ^ The text to align
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-> String
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left n str = take n $ str ++ repeat ' '
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-- | Aligns text to the right within a field (clipping if necessary)
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right
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:: Int
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-- ^ The width of the field
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-> String
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-- ^ The text to align
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-> String
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right n str = reverse $ left n $ reverse str
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-- | Aligns text to the centre within a field (clipping if necessary)
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centre
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:: Int
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-- ^ The width of the field
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-> String
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-- ^ The text to align
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-> String
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centre n str = let
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sLen = length str
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pLen = (n - sLen) `div` 2
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pad = replicate pLen ' '
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in take n $ pad ++ str ++ repeat ' '
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-- | Overlays one string on top of another
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overlay
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:: String
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-- ^ The string on the top
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-> String
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-- ^ The string on the bottom
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-> String
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overlay (x:xs) (_:ys) = x : overlay xs ys
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overlay xs [] = xs
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overlay [] ys = ys
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-- | Converts a number to a three character month (e.g. @"JAN"@)
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month :: Int -> String
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month 1 = "JAN"
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month 2 = "FEB"
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month 3 = "MAR"
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month 4 = "APR"
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month 5 = "MAY"
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month 6 = "JUN"
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month 7 = "JUL"
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month 8 = "AUG"
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month 9 = "SEP"
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month 10 = "OCT"
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month 11 = "NOV"
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month 12 = "DEC"
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month _ = ""
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