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--------------------------------------------------------------------------------
{-# LANGUAGE OverloadedStrings #-}
import           Control.Applicative ((<$>))
import           Data.Monoid         (mappend)
import           Hakyll
import           Data.Map as M
import qualified Data.Set as S
import           Data.Maybe          (fromMaybe)
import           Text.Pandoc.Options

config :: Configuration
config = defaultConfiguration
  { deployCommand =
      "rsync -Havz _site/ rekado@elephly.net:/srv/disk1/rekado/elephly.net" }

--------------------------------------------------------------------------------
main :: IO ()
main = hakyllWith config $ do
    match "css/*" $ do
        route   idRoute
        compile compressCssCompiler

    match (    "js/libs/*"
          .||. "js/hyphenator/*"
          .||. "js/hyphenator/patterns/*"
          .||. "js/*"
          .||. "downies/*"
          .||. "downies/music/*"
          .||. "images/*"
          .||. "images/posts/*"
          .||. "images/posts/*/*"
          .||. "favicon.ico"
          ) $ do
      route   idRoute
      compile copyFileCompiler

    match ( "static/*.markdown" .||. "static/*/*.markdown" ) $ do
      route   $ setExtension "html" `composeRoutes` gsubRoute "static/" (const "")
      compile $ pandocCompiler
        >>= loadAndApplyTemplate "templates/default.html" defaultContext
        >>= relativizeUrls

    match "static/*.html" $ do
      route   $ gsubRoute "static/" (const "")
      compile $ do
        getResourceBody
          >>= loadAndApplyTemplate "templates/default.html" defaultContext
          >>= relativizeUrls

    match "posts/*.markdown" $ do
      route   $ setExtension "html"
      compile defaultCompiler
        --itemTpl <- loadBody "templates/photo.html" 
        --metadata <- getMetadata
        --let m = M.lookup "photo" metadata

    -- direct links
    match "posts/2010-03-28-elephly.markdown" $ version "direct" $  do
      route   $ constRoute "elephly.html"
      compile defaultCompiler

    match "posts/2010-03-23-fur-man.markdown" $ version "direct" $  do
      route   $ constRoute "fur-man.html"
      compile defaultCompiler

    -- blog post archive
    create ["posts/index.html"] $ do
      route   idRoute
      compile $ do
        let archiveCtx =
              field "posts" (\_ -> postList recentFirst) `mappend`
              defaultContext

        makeItem ""
          >>= loadAndApplyTemplate "templates/archive.html" archiveCtx
          >>= loadAndApplyTemplate "templates/default.html" archiveCtx
          >>= relativizeUrls

    -- always show the most recent blog post
    create ["index.html"] $ do
      route idRoute
      compile $ do
        mostRecent <- fmap head . recentFirst =<< loadAllSnapshots "posts/*.markdown" "non-relative"
        makeItem (itemBody mostRecent) >>= relativizeUrls

    match "templates/*" $ compile templateCompiler


--------------------------------------------------------------------------------
postCtx :: Context String
postCtx =
    dateField "date" "%B %e, %Y" `mappend`
    photoSnippet `mappend`
    flattrSnippet `mappend`
    licenseSnippet `mappend`
    defaultContext

-- If a post declares a certain key in the metadata header,
-- load the given template, otherwise ignore.
snippet :: String -> String -> Identifier -> Context String
snippet name key templatePath = field name $ \item -> do
    metadata <- getMetadata (itemIdentifier item)
    case M.lookup key metadata of
      Just file -> itemBody <$> loadAndApplyTemplate templatePath postCtx item
      _         -> return ""

photoSnippet   = snippet "photo-snippet" "photo" "templates/photo.html"
flattrSnippet  = snippet "flattr-snippet" "flattr" "templates/flattr.html"
licenseSnippet = snippet "license-snippet" "license" "templates/license.html"


--------------------------------------------------------------------------------
postList :: ([Item String] -> Compiler [Item String]) -> Compiler String
postList sortFilter = do
  posts   <- sortFilter =<< loadAll ("posts/*.markdown" .&&. hasNoVersion)
  itemTpl <- loadBody "templates/post-item.html"
  list    <- applyTemplateList itemTpl postCtx posts
  return list

customPandocCompiler :: Compiler (Item String)
customPandocCompiler =
    pandocCompilerWith
      (addRExt Ext_pipe_tables defaultHakyllReaderOptions)
      (addWExt Ext_pipe_tables defaultHakyllWriterOptions)
  where
    addRExt e opts = opts { readerExtensions = S.insert e (readerExtensions opts) }
    addWExt e opts = opts { writerExtensions = S.insert e (writerExtensions opts) }

defaultCompiler = customPandocCompiler
  >>= loadAndApplyTemplate "templates/post.html"    postCtx
  >>= loadAndApplyTemplate "templates/default.html" postCtx
  >>= saveSnapshot "non-relative"
  >>= relativizeUrls