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Diffstat (limited to 'src/Text/Pandoc/Filter/Path.hs')
-rw-r--r-- | src/Text/Pandoc/Filter/Path.hs | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/Text/Pandoc/Filter/Path.hs b/src/Text/Pandoc/Filter/Path.hs new file mode 100644 index 000000000..8074bcbb7 --- /dev/null +++ b/src/Text/Pandoc/Filter/Path.hs @@ -0,0 +1,53 @@ +{- +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 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 |