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|
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeSynonymInstances #-}
{-
Copyright (C) 2009-2017 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.Templates
Copyright : Copyright (C) 2009-2017 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
A simple templating system with variable substitution and conditionals.
-}
module Text.Pandoc.Templates ( module Text.DocTemplates
, renderTemplate'
, getDefaultTemplate
) where
import Control.Monad.Except (throwError)
import Data.Aeson (ToJSON (..))
import qualified Data.Text as T
import System.FilePath ((<.>), (</>))
import Text.DocTemplates (Template, TemplateTarget, applyTemplate,
compileTemplate, renderTemplate, varListToJSON)
import Text.Pandoc.Class (PandocMonad(readDataFile))
import Text.Pandoc.Error
import qualified Text.Pandoc.UTF8 as UTF8
-- | Get default template for the specified writer.
getDefaultTemplate :: PandocMonad m
=> (Maybe FilePath) -- ^ User data directory to search 1st
-> String -- ^ Name of writer
-> m String
getDefaultTemplate user writer = do
let format = takeWhile (`notElem` ("+-" :: String)) writer -- strip off extensions
case format of
"native" -> return ""
"json" -> return ""
"docx" -> return ""
"fb2" -> return ""
"odt" -> getDefaultTemplate user "opendocument"
"html" -> getDefaultTemplate user "html5"
"docbook" -> getDefaultTemplate user "docbook5"
"epub" -> getDefaultTemplate user "epub3"
"markdown_strict" -> getDefaultTemplate user "markdown"
"multimarkdown" -> getDefaultTemplate user "markdown"
"markdown_github" -> getDefaultTemplate user "markdown"
"markdown_mmd" -> getDefaultTemplate user "markdown"
"markdown_phpextra" -> getDefaultTemplate user "markdown"
_ -> let fname = "templates" </> "default" <.> format
in UTF8.toString <$> readDataFile user fname
-- | Like 'applyTemplate', but runs in PandocMonad and
-- raises an error if compilation fails.
renderTemplate' :: (PandocMonad m, ToJSON a, TemplateTarget b)
=> String -> a -> m b
renderTemplate' template context = do
case applyTemplate (T.pack template) context of
Left e -> throwError (PandocTemplateError e)
Right r -> return r
|
