ghc-mod/src/GHCMod/Options/ShellEscape.hs

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-- ghc-mod: Making Haskell development *more* fun
-- Copyright (C) 2015 Nikolay Yakimov <root@livid.pp.ru>
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
module GHCMod.Options.ShellEscape (parseCmdLine) where
import Data.Char
import Data.Maybe
isQuote :: Char -> Bool
isQuote = (==) '"'
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isEscapeChar :: Char -> Bool
isEscapeChar = (==) '\\'
isEscapable :: Char -> Bool
isEscapable c = any ($ c) [isSpace, isQuote, isEscapeChar]
go :: String -> String -> [String] -> Maybe Char -> [String]
-- result
go [] curarg accargs _ = reverse $ reverse curarg : accargs
-- escaped character
go (esc:c:cl) curarg accargs quote
| isEscapeChar esc
= if isEscapable c
then go cl (c:curarg) accargs quote
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else go (c:cl) (esc:curarg) accargs quote
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-- quote character -- opens quotes
go (c:cl) curarg accargs Nothing
| isQuote c = go cl curarg accargs (Just c)
-- close quotes
go (c:cl) curarg accargs (Just q)
| c == q = go cl curarg accargs Nothing
go (c:cl) curarg accargs quotes
-- space separates argumetns outside quotes
| isSpace c && isNothing quotes
= if null curarg
then go cl curarg accargs quotes
else go cl [] (reverse curarg : accargs) quotes
-- general character
| otherwise = go cl (c:curarg) accargs quotes
parseCmdLine :: String -> [String]
parseCmdLine comline = go comline [] [] Nothing