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{-# LANGUAGE NoImplicitPrelude #-}
{-
Copyright (C) 2006-2018 John MacFarlane <jgm@berkeley.edu>
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.Filter.Path
Copyright : Copyright (C) 2006-2018 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley@edu>
Stability : alpha
Portability : portable
Expand paths of filters, searching the data directory.
-}
module Text.Pandoc.Filter.Path
( expandFilterPath
) where
import Prelude
import Text.Pandoc.Class (PandocMonad, fileExists, getUserDataDir)
import System.FilePath ((</>), isRelative)
-- First we check to see if a filter is found. If not, and if it's
-- not an absolute path, we check to see whether it's in `userdir/filters`.
-- If not, we leave it unchanged.
expandFilterPath :: PandocMonad m => FilePath -> m FilePath
expandFilterPath fp = do
mbDatadir <- getUserDataDir
fpExists <- fileExists fp
if fpExists
then return fp
else case mbDatadir of
Just datadir | isRelative fp -> do
let filterPath = datadir </> "filters" </> fp
filterPathExists <- fileExists filterPath
if filterPathExists
then return filterPath
else return fp
_ -> return fp
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