ghc-mod/Language/Haskell/GhcMod/Options/ShellParse.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 Language.Haskell.GhcMod.Options.ShellParse (parseCmdLine) where
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import Data.Char
import Data.List
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go :: String -> String -> [String] -> Bool -> [String]
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-- result
go [] curarg accargs _ = reverse $ reverse curarg : accargs
go (c:cl) curarg accargs quotes
-- open quotes
| c == '\STX', not quotes
= go cl curarg accargs True
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-- close quotes
| c == '\ETX', quotes
= go cl curarg accargs False
-- space separates arguments outside quotes
| isSpace c, not quotes
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= 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'
| Just comline <- stripPrefix "ascii-escape " $ dropWhile isSpace comline'
= go (dropWhile isSpace comline) [] [] False
parseCmdLine [] = [""]
parseCmdLine comline = words comline