Move src/ to lib/, put Init.hs in src/

1 files changed, 164 insertions, 0 deletions

diff --git a/lib/Hakyll/Web/Pandoc.hs b/lib/Hakyll/Web/Pandoc.hs
new file mode 100644
index 0000000..eec0a8a
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+++ b/lib/Hakyll/Web/Pandoc.hs
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+--------------------------------------------------------------------------------
+-- | Module exporting convenient pandoc bindings
+module Hakyll.Web.Pandoc
+    ( -- * The basic building blocks
+      readPandoc
+    , readPandocWith
+    , writePandoc
+    , writePandocWith
+    , renderPandoc
+    , renderPandocWith
+
+      -- * Derived compilers
+    , pandocCompiler
+    , pandocCompilerWith
+    , pandocCompilerWithTransform
+    , pandocCompilerWithTransformM
+
+      -- * Default options
+    , defaultHakyllReaderOptions
+    , defaultHakyllWriterOptions
+    ) where
+
+
+--------------------------------------------------------------------------------
+import qualified Data.Set                   as S
+import           Text.Pandoc
+import           Text.Pandoc.Error          (PandocError (..))
+
+
+--------------------------------------------------------------------------------
+import           Hakyll.Core.Compiler
+import           Hakyll.Core.Item
+import           Hakyll.Web.Pandoc.FileType
+
+
+--------------------------------------------------------------------------------
+-- | Read a string using pandoc, with the default options
+readPandoc
+    :: Item String             -- ^ String to read
+    -> Compiler (Item Pandoc)  -- ^ Resulting document
+readPandoc = readPandocWith defaultHakyllReaderOptions
+
+
+--------------------------------------------------------------------------------
+-- | Read a string using pandoc, with the supplied options
+readPandocWith
+    :: ReaderOptions           -- ^ Parser options
+    -> Item String             -- ^ String to read
+    -> Compiler (Item Pandoc)  -- ^ Resulting document
+readPandocWith ropt item =
+    case traverse (reader ropt (itemFileType item)) item of
+        Left (ParseFailure err)  -> fail $
+            "Hakyll.Web.Pandoc.readPandocWith: parse failed: " ++ err
+        Left (ParsecError _ err) -> fail $
+            "Hakyll.Web.Pandoc.readPandocWith: parse failed: " ++ show err
+        Right item'              -> return item'
+  where
+    reader ro t = case t of
+        DocBook            -> readDocBook ro
+        Html               -> readHtml ro
+        LaTeX              -> readLaTeX ro
+        LiterateHaskell t' -> reader (addExt ro Ext_literate_haskell) t'
+        Markdown           -> readMarkdown ro
+        MediaWiki          -> readMediaWiki ro
+        OrgMode            -> readOrg ro
+        Rst                -> readRST ro
+        Textile            -> readTextile ro
+        _                  -> error $
+            "Hakyll.Web.readPandocWith: I don't know how to read a file of " ++
+            "the type " ++ show t ++ " for: " ++ show (itemIdentifier item)
+
+    addExt ro e = ro {readerExtensions = S.insert e $ readerExtensions ro}
+
+
+--------------------------------------------------------------------------------
+-- | Write a document (as HTML) using pandoc, with the default options
+writePandoc :: Item Pandoc  -- ^ Document to write
+            -> Item String  -- ^ Resulting HTML
+writePandoc = writePandocWith defaultHakyllWriterOptions
+
+
+--------------------------------------------------------------------------------
+-- | Write a document (as HTML) using pandoc, with the supplied options
+writePandocWith :: WriterOptions  -- ^ Writer options for pandoc
+                -> Item Pandoc    -- ^ Document to write
+                -> Item String    -- ^ Resulting HTML
+writePandocWith wopt = fmap $ writeHtmlString wopt
+
+
+--------------------------------------------------------------------------------
+-- | Render the resource using pandoc
+renderPandoc :: Item String -> Compiler (Item String)
+renderPandoc =
+    renderPandocWith defaultHakyllReaderOptions defaultHakyllWriterOptions
+
+
+--------------------------------------------------------------------------------
+-- | Render the resource using pandoc
+renderPandocWith
+    :: ReaderOptions -> WriterOptions -> Item String -> Compiler (Item String)
+renderPandocWith ropt wopt item =
+    writePandocWith wopt <$> readPandocWith ropt item
+
+
+--------------------------------------------------------------------------------
+-- | Read a page render using pandoc
+pandocCompiler :: Compiler (Item String)
+pandocCompiler =
+    pandocCompilerWith defaultHakyllReaderOptions defaultHakyllWriterOptions
+
+
+--------------------------------------------------------------------------------
+-- | A version of 'pandocCompiler' which allows you to specify your own pandoc
+-- options
+pandocCompilerWith :: ReaderOptions -> WriterOptions -> Compiler (Item String)
+pandocCompilerWith ropt wopt =
+    cached "Hakyll.Web.Pandoc.pandocCompilerWith" $
+        pandocCompilerWithTransform ropt wopt id
+
+
+--------------------------------------------------------------------------------
+-- | An extension of 'pandocCompilerWith' which allows you to specify a custom
+-- pandoc transformation for the content
+pandocCompilerWithTransform :: ReaderOptions -> WriterOptions
+                            -> (Pandoc -> Pandoc)
+                            -> Compiler (Item String)
+pandocCompilerWithTransform ropt wopt f =
+    pandocCompilerWithTransformM ropt wopt (return . f)
+
+
+--------------------------------------------------------------------------------
+-- | Similar to 'pandocCompilerWithTransform', but the transformation
+-- function is monadic. This is useful when you want the pandoc
+-- transformation to use the 'Compiler' information such as routes,
+-- metadata, etc
+pandocCompilerWithTransformM :: ReaderOptions -> WriterOptions
+                    -> (Pandoc -> Compiler Pandoc)
+                    -> Compiler (Item String)
+pandocCompilerWithTransformM ropt wopt f =
+    writePandocWith wopt <$>
+        (traverse f =<< readPandocWith ropt =<< getResourceBody)
+
+
+--------------------------------------------------------------------------------
+-- | The default reader options for pandoc parsing in hakyll
+defaultHakyllReaderOptions :: ReaderOptions
+defaultHakyllReaderOptions = def
+    { -- The following option causes pandoc to read smart typography, a nice
+      -- and free bonus.
+      readerSmart = True
+    }
+
+
+--------------------------------------------------------------------------------
+-- | The default writer options for pandoc rendering in hakyll
+defaultHakyllWriterOptions :: WriterOptions
+defaultHakyllWriterOptions = def
+    { -- This option causes literate haskell to be written using '>' marks in
+      -- html, which I think is a good default.
+      writerExtensions = S.insert Ext_literate_haskell (writerExtensions def)
+    , -- We want to have hightlighting by default, to be compatible with earlier
+      -- Hakyll releases
+      writerHighlight  = True
+    }