42 lines
1.4 KiB
Haskell
42 lines
1.4 KiB
Haskell
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-- ghc-mod: Making Haskell development *more* fun
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-- Copyright (C) 2015 Daniel Gröber <dxld ÄT darkboxed DOT org>
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--
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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 Affero General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU Affero General Public License for more details.
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--
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-- You should have received a copy of the GNU Affero General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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module Common where
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import Control.Applicative
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import Data.List
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import Data.Maybe
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import System.Environment
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import System.IO
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errMsg :: String -> IO ()
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errMsg str = do
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prog <- getProgName
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hPutStrLn stderr $ prog ++ ": " ++ str
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align :: String -> String -> String -> String
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align n an str = let
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h:rest = lines str
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[hm] = match n h
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rest' = [ move (hm - rm) r | r <- rest, rm <- match an r]
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in
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unlines (h:rest')
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where
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match p str' = maybeToList $
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fst <$> find ((p `isPrefixOf`) . snd) ([0..] `zip` tails str')
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move i str' | i > 0 = replicate i ' ' ++ str'
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move i str' = drop i str'
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