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{-# LANGUAGE OverloadedStrings #-}
{-
Copyright (C) 2014-2016 Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-}

{- |
   Module      : Text.Pandoc.Readers.Org.Options
   Copyright   : Copyright (C) 2014-2016 Albert Krewinkel
   License     : GNU GPL, version 2 or above

   Maintainer  : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>

Utility functions used in other Pandoc Org modules.
-}
module Text.Pandoc.Readers.Org.Shared
  ( isImageFilename
  , rundocBlockClass
  , toRundocAttrib
  , translateLang
  ) where

import           Control.Arrow ( first )
import           Data.List ( isPrefixOf, isSuffixOf )


-- | Check whether the given string looks like the path to of URL of an image.
isImageFilename :: String -> Bool
isImageFilename filename =
  any (\x -> ('.':x)  `isSuffixOf` filename) imageExtensions &&
  (any (\x -> (x++":") `isPrefixOf` filename) protocols ||
   ':' `notElem` filename)
 where
   imageExtensions = [ "jpeg" , "jpg" , "png" , "gif" , "svg" ]
   protocols = [ "file", "http", "https" ]

-- | Prefix used for Rundoc classes and arguments.
rundocPrefix :: String
rundocPrefix = "rundoc-"

-- | The class-name used to mark rundoc blocks.
rundocBlockClass :: String
rundocBlockClass = rundocPrefix ++ "block"

-- | Prefix the name of a attribute, marking it as a code execution parameter.
toRundocAttrib :: (String, String) -> (String, String)
toRundocAttrib = first (rundocPrefix ++)

-- | Translate from Org-mode's programming language identifiers to those used
-- by Pandoc.  This is useful to allow for proper syntax highlighting in
-- Pandoc output.
translateLang :: String -> String
translateLang cs =
  case cs of
    "C"          -> "c"
    "C++"        -> "cpp"
    "emacs-lisp" -> "commonlisp" -- emacs lisp is not supported
    "js"         -> "javascript"
    "lisp"       -> "commonlisp"
    "R"          -> "r"
    "sh"         -> "bash"
    "sqlite"     -> "sql"
    _            -> cs