-- This file is part of Diohsc
-- Copyright (C) 2020 Martin Bays <mbays@sdf.org>
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of version 3 of the GNU General Public License as
-- published by the Free Software Foundation, or any later version.
--
-- You should have received a copy of the GNU General Public License
-- along with this program.  If not, see http://www.gnu.org/licenses/.

{-# LANGUAGE Safe #-}

module Alias where

import           Data.Bifunctor (second)
import           Data.List      (isPrefixOf)
import           Safe           (headMay)

import           CommandLine

data Alias = Alias String CommandLine
    deriving (Eq,Ord,Show)

type Aliases = [(String,Alias)]

emptyAliases :: Aliases
emptyAliases = []

defaultAliases :: Aliases
defaultAliases = second aliasOf <$>
    [ ("back", "<") , ("forward", ">") , ("next", "~") ]
    where aliasOf s = let Right cl = parseCommandLine s in Alias s cl

lookupAlias :: String -> Aliases -> Maybe Alias
lookupAlias s aliases =
    headMay [ alias | (a,alias) <- aliases, s `isPrefixOf` a ]

insertAlias :: String -> Alias -> Aliases -> Aliases
insertAlias a alias = (++ [(a, alias)])

deleteAlias :: String -> Aliases -> Aliases
deleteAlias a = filter $ (/= a) . fst