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|
{-# LANGUAGE OverloadedStrings #-}
{- |
Module : Text.Pandoc.Templates
Copyright : Copyright (C) 2009-2019 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 Prelude
import Control.Monad.Except (throwError)
import Data.Aeson (ToJSON (..))
import qualified Data.Text as T
import System.FilePath ((<.>), (</>))
import Text.DocTemplates (Template, applyTemplate,
compileTemplate, renderTemplate)
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
=> String -- ^ Name of writer
-> m String
getDefaultTemplate writer = do
let format = takeWhile (`notElem` ("+-" :: String)) writer -- strip off extensions
case format of
"native" -> return ""
"json" -> return ""
"docx" -> return ""
"fb2" -> return ""
"pptx" -> return ""
"ipynb" -> return ""
"odt" -> getDefaultTemplate "opendocument"
"html" -> getDefaultTemplate "html5"
"docbook" -> getDefaultTemplate "docbook5"
"epub" -> getDefaultTemplate "epub3"
"beamer" -> getDefaultTemplate "latex"
"markdown_strict" -> getDefaultTemplate "markdown"
"multimarkdown" -> getDefaultTemplate "markdown"
"markdown_github" -> getDefaultTemplate "markdown"
"markdown_mmd" -> getDefaultTemplate "markdown"
"markdown_phpextra" -> getDefaultTemplate "markdown"
"gfm" -> getDefaultTemplate "commonmark"
_ -> let fname = "templates" </> "default" <.> format
in UTF8.toString <$> readDataFile fname
-- | Like 'applyTemplate', but runs in PandocMonad and
-- raises an error if compilation fails.
renderTemplate' :: (PandocMonad m, ToJSON a)
=> String -> a -> m T.Text
renderTemplate' template context =
case applyTemplate (T.pack template) context of
Left e -> throwError (PandocTemplateError e)
Right r -> return r
|
