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{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# 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
Utility functions for working with pandoc templates.
-}
module Text.Pandoc.Templates ( Template
, WithDefaultPartials(..)
, WithPartials(..)
, compileTemplate
, renderTemplate
, getTemplate
, getDefaultTemplate
, compileDefaultTemplate
) where
import Prelude
import System.FilePath ((<.>), (</>), takeFileName)
import Text.DocTemplates (Template, TemplateMonad(..), compileTemplate, renderTemplate)
import Text.Pandoc.Class (PandocMonad, readDataFile, fetchItem,
CommonState(..), getCommonState, modifyCommonState)
import qualified Text.Pandoc.UTF8 as UTF8
import Control.Monad.Except (catchError, throwError)
import Data.Text (Text)
import qualified Data.Text as T
import Text.Pandoc.Error
-- | Wrap a Monad in this if you want partials to
-- be taken only from the default data files.
newtype WithDefaultPartials m a = WithDefaultPartials { runWithDefaultPartials :: m a }
deriving (Functor, Applicative, Monad)
-- | Wrap a Monad in this if you want partials to
-- be looked for locally (or, when the main template
-- is at a URL, via HTTP), falling back to default data files.
newtype WithPartials m a = WithPartials { runWithPartials :: m a }
deriving (Functor, Applicative, Monad)
instance PandocMonad m => TemplateMonad (WithDefaultPartials m) where
getPartial fp = WithDefaultPartials $
UTF8.toText <$> readDataFile ("templates" </> takeFileName fp)
instance PandocMonad m => TemplateMonad (WithPartials m) where
getPartial fp = WithPartials $ getTemplate fp
-- | Retrieve text for a template.
getTemplate :: PandocMonad m => FilePath -> m Text
getTemplate tp = UTF8.toText <$>
((do surl <- stSourceURL <$> getCommonState
-- we don't want to look for templates remotely
-- unless the full URL is specified:
modifyCommonState $ \st -> st{
stSourceURL = Nothing }
(bs, _) <- fetchItem $ T.pack tp
modifyCommonState $ \st -> st{
stSourceURL = surl }
return bs)
`catchError`
(\e -> case e of
PandocResourceNotFound _ ->
-- see #5987 on reason for takeFileName
readDataFile ("templates" </> takeFileName tp)
_ -> throwError e))
-- | Get default template for the specified writer.
getDefaultTemplate :: PandocMonad m
=> Text -- ^ Name of writer
-> m Text
getDefaultTemplate writer = do
let format = T.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"
_ -> do
let fname = "templates" </> "default" <.> T.unpack format
UTF8.toText <$> readDataFile fname
-- | Get and compile default template for the specified writer.
-- Raise an error on compilation failure.
compileDefaultTemplate :: PandocMonad m
=> Text
-> m (Template Text)
compileDefaultTemplate writer = do
res <- getDefaultTemplate writer >>=
runWithDefaultPartials .
compileTemplate ("templates/default." <> T.unpack writer)
case res of
Left e -> throwError $ PandocTemplateError (T.pack e)
Right t -> return t
|
