-- Copyright: 2007, 2008 Dino Morelli
-- License: BSD3 (see LICENSE)
-- Author: Dino Morelli <dino@ui3.info>

module Photoname.Opts
   ( Flag (..)
   , Opts
   , parseOpts, usageText
   )
   where

import System.Console.GetOpt


data Flag
   = NoAction
   | Quiet
   | Move
   | Help
   deriving Eq


-- A convenience type representing all flags and all non-flag strings
-- that came in from outside
type Opts = ([Flag], [String])


options :: [OptDescr Flag]
options =
   [ Option ['n'] ["no-action"] (NoArg NoAction) 
         "Display what would be done, but do nothing"
   , Option ['q'] ["quiet"] (NoArg Quiet) 
         "Suppress normal output of what's being done"
   , Option []    ["move"] (NoArg Move)
         "Move the files, don't just hard-link to the new locations"
   , Option ['h'] ["help"] (NoArg Help)
         "This help text"
   ]


parseOpts :: [String] -> IO Opts
parseOpts argv = 
   case getOpt Permute options argv of
      (o,n,[]  ) -> return (o,n)
      (_,_,errs) -> ioError (userError (concat errs ++ usageText))


usageText :: String
usageText = (usageInfo header options) ++ "\n" ++ footer
   where
      header = init $ unlines
         [ "Usage: photoname [OPTIONS] PARENTDIR FILES"
         , "Rename and move photo files based on EXIF data"
         , ""
         , "Options:"
         ]
      footer = init $ unlines
         [ "This software is for renaming and storing your digital photos. It will extract"
         , "shoot date from the EXIF data in the image file and use that along with the"
         , "usually-camera-assigned serial number to build a meaningful filename."
         , ""
         , "You get a subdirectory hierarchy consisting of directories for the years,"
         , "then subdirs within those for the day photos were shot. These day dirs"
         , "contain the image files, renamed as follows:"
         , ""
         , "A photo shot on 2002-May-02 with a Canon camera:"
         , "   img_1790.jpg -> <PARENTDIR>/2002/2002-05-02/20020502_790.jpg"
         , ""
         , "The <PARENTDIR> is the one given on the command-line to this utility, and"
         , "represents the top-level of where you're storing photos."
         , ""
         , "Note that the default behavior of this software is to create hard links to"
         , "the new paths and leave the original links as they were. You can use the"
         , "--move switch to blow away the original location, leaving only the new."
         , ""
         , "Version 2.0  2008-Mar-04  Dino Morelli <dino@ui3.info>"
         ]