------------------------------------------------------------------------------
-- |
-- Module: Xmobar.App.Opts
-- Copyright: (c) 2018, 2019, 2020 Jose Antonio Ortega Ruiz
-- License: BSD3-style (see LICENSE)
--
-- Maintainer: jao@gnu.org
-- Stability: unstable
-- Portability: portable
-- Created: Fri Nov 30, 2018 01:19
--
--
-- Command line option parsing
--
------------------------------------------------------------------------------

module Xmobar.App.Opts (recompileFlag, verboseFlag, getOpts, doOpts) where

import Control.Monad (when)
import System.Console.GetOpt
import System.Exit (exitSuccess, exitWith, ExitCode(..))
import Data.Version (showVersion)
import Text.Read (readMaybe)

import Paths_xmobar (version)

import Xmobar.Config.Types

data Opts = Help
          | Verbose
          | Recompile
          | Version
          | Font       String
          | AddFont    String
          | BgColor    String
          | FgColor    String
          | Alpha      String
          | T
          | B
          | D
          | AlignSep   String
          | Commands   String
          | AddCommand String
          | SepChar    String
          | Template   String
          | OnScr      String
          | IconRoot   String
          | Position   String
          | WmClass    String
          | WmName     String
       deriving (Show, Eq)

options :: [OptDescr Opts]
options =
    [ Option "h?" ["help"] (NoArg Help) "This help"
    , Option "v" ["verbose"] (NoArg Verbose) "Emit verbose debugging messages"
    , Option "r" ["recompile"] (NoArg Recompile) "Force recompilation"
    , Option "V" ["version"] (NoArg Version) "Show version information"
    , Option "f" ["font"] (ReqArg Font "font name") "Font name"
    , Option "N" ["add-font"] (ReqArg AddFont "font name") "Add to the list of additional fonts"
    , Option "w" ["wmclass"] (ReqArg WmClass "class") "X11 WM_CLASS property"
    , Option "n" ["wmname"] (ReqArg WmName "name") "X11 WM_NAME property"
    , Option "B" ["bgcolor"] (ReqArg BgColor "bg color" )
      "The background color. Default black"
    , Option "F" ["fgcolor"] (ReqArg FgColor "fg color")
      "The foreground color. Default grey"
    , Option "i" ["iconroot"] (ReqArg IconRoot "path")
      "Root directory for icon pattern paths. Default '.'"
    , Option "A" ["alpha"] (ReqArg Alpha "alpha")
      "Transparency: 0 is transparent, 255 is opaque. Default: 255"
    , Option "o" ["top"] (NoArg T) "Place xmobar at the top of the screen"
    , Option "b" ["bottom"] (NoArg B)
      "Place xmobar at the bottom of the screen"
    , Option "d" ["dock"] (NoArg D)
      "Don't override redirect from WM and function as a dock"
    , Option "a" ["alignsep"] (ReqArg AlignSep "alignsep")
      "Separators for left, center and right text\nalignment. Default: '}{'"
    , Option "s" ["sepchar"] (ReqArg SepChar "char")
      ("Character used to separate commands in" ++
       "\nthe output template. Default '%'")
    , Option "t" ["template"] (ReqArg Template "template")
      "Output template"
    , Option "c" ["commands"] (ReqArg Commands "commands")
      "List of commands to be executed"
    , Option "C" ["add-command"] (ReqArg AddCommand "command")
      "Add to the list of commands to be executed"
    , Option "x" ["screen"] (ReqArg OnScr "screen")
      "On which X screen number to start"
    , Option "p" ["position"] (ReqArg Position "position")
      "Specify position of xmobar. Same syntax as in config file"
    ]

getOpts :: [String] -> IO ([Opts], [String])
getOpts argv = do
   (o,n) <-  case getOpt Permute options argv of
               (o,n,[])   -> return (o,n)
               (_,_,errs) -> error (concat errs ++ usage)
   when (Help `elem` o) (putStr usage >> exitSuccess)
   when (Version `elem` o) (putStr info >> exitSuccess)
   return (o, n)

usage :: String
usage = usageInfo header options ++ footer
    where header = "Usage: xmobar [OPTION...] [FILE]\nOptions:"
          footer = "\nMail bug reports and suggestions to " ++ mail ++ "\n"

info :: String
info = "xmobar " ++ showVersion version
        ++ "\n (C) 2010 - 2020 Jose A Ortega Ruiz"
        ++ "\n (C) 2007 - 2010 Andrea Rossato\n "
        ++ mail ++ "\n" ++ license ++ "\n"

mail :: String
mail = "<mail@jao.io>"

license :: String
license = "\nThis program is distributed in the hope that it will be useful," ++
          "\nbut WITHOUT ANY WARRANTY; without even the implied warranty of" ++
          "\nMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." ++
          "\nSee the License for more details."

doOpts :: Config -> [Opts] -> IO Config
doOpts conf [] =
  return (conf {lowerOnStart = lowerOnStart conf && overrideRedirect conf})
doOpts conf (o:oo) =
  case o of
    Help -> doOpts' conf
    Version -> doOpts' conf
    Recompile -> doOpts' conf
    Verbose -> doOpts' (conf {verbose = True})
    Font s -> doOpts' (conf {font = s})
    AddFont s -> doOpts' (conf {additionalFonts = additionalFonts conf ++ [s]})
    WmClass s -> doOpts' (conf {wmClass = s})
    WmName s -> doOpts' (conf {wmName = s})
    BgColor s -> doOpts' (conf {bgColor = s})
    FgColor s -> doOpts' (conf {fgColor = s})
    Alpha n -> doOpts' (conf {alpha = read n})
    T -> doOpts' (conf {position = Top})
    B -> doOpts' (conf {position = Bottom})
    D -> doOpts' (conf {overrideRedirect = False})
    AlignSep s -> doOpts' (conf {alignSep = s})
    SepChar s -> doOpts' (conf {sepChar = s})
    Template s -> doOpts' (conf {template = s})
    IconRoot s -> doOpts' (conf {iconRoot = s})
    OnScr n -> doOpts' (conf {position = OnScreen (read n) $ position conf})
    Commands s -> case readCom 'c' s of
                    Right x -> doOpts' (conf {commands = x})
                    Left e -> putStr (e ++ usage) >> exitWith (ExitFailure 1)
    AddCommand s -> case readCom 'C' s of
                      Right x -> doOpts' (conf {commands = commands conf ++ x})
                      Left e -> putStr (e ++ usage) >> exitWith (ExitFailure 1)
    Position s -> readPosition s
  where readCom c str =
          case readStr str of
            [x] -> Right x
            _  -> Left ("xmobar: cannot read list of commands " ++
                        "specified with the -" ++ c:" option\n")
        readStr str = [x | (x,t) <- reads str, ("","") <- lex t]
        doOpts' c = doOpts c oo
        readPosition string =
            case readMaybe string of
                Just x  -> doOpts' (conf { position = x })
                Nothing -> do
                    putStrLn "Can't parse position option, ignoring"
                    doOpts' conf

recompileFlag :: [Opts] -> Bool
recompileFlag = elem Recompile

verboseFlag :: [Opts] -> Bool
verboseFlag = elem Verbose