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path: root/site.hs
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--------------------------------------------------------------------------------
{-# LANGUAGE OverloadedStrings #-}
import           Control.Applicative ((<$>))
import           Data.Monoid         ((<>))
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:/home/rekado/elephly.net" }

myFeedConfiguration :: FeedConfiguration
myFeedConfiguration = FeedConfiguration
  { feedTitle       = "Rekado's website"
  , feedDescription = "Music, words, and hacking"
  , feedAuthorName  = "Rekado"
  , feedAuthorEmail = "rekado+feed@elephly.net"
  , feedRoot        = "http://elephly.net"
  }

--------------------------------------------------------------------------------
main :: IO ()
main = hakyllWith config $ do
    tags <- buildTags "posts/*.markdown" (fromCapture "tags/*.html")

    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"
          .||. "rekado.pubkey"
          ) $ do
      route   idRoute
      compile copyFileCompiler

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

    -- place static html files in site root
    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

    -- 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
      let title = "Archive"

      route   idRoute
      compile $ do
        let archiveCtx =
              constField "title" title <>
              field "posts" (\_ -> postList "posts/*.markdown" recentFirst) <>
              field "tags" (\_ -> renderTagList tags) <>
              defaultContext

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

    create ["rss.xml"] $ postFeed renderRss
    create ["atom.xml"] $ postFeed renderAtom

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


    tagsRules tags $ \tag pattern -> do
      let title = "Posts tagged &ldquo;" ++ tag ++ "&rdquo;"

      route idRoute
      compile $ do
        let ctx = constField "title" title <>
                  field "posts" (\_ -> postList pattern recentFirst) <>
                  tagsField "tags" tags <>
                  defaultContext

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

    match "templates/*" $ compile templateCompiler


--------------------------------------------------------------------------------
postCtx :: Context String
postCtx = dateField "date" "%B %e, %Y"
          <> photoSnippet
          <> flattrSnippet
          <> licenseSnippet
          <> 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"

postFeed renderer = do
  route idRoute
  compile $ do
    let feedCtx = postCtx <> bodyField "description"
    posts <- fmap (take 10) . recentFirst =<<
      loadAllSnapshots "posts/*.markdown" "content"
    renderer myFeedConfiguration feedCtx posts

--------------------------------------------------------------------------------
postList :: Pattern -> ([Item String] -> Compiler [Item String]) -> Compiler String
postList pattern sortFilter = do
  posts   <- sortFilter =<< loadAll (pattern .&&. 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 es opts =
      opts { readerExtensions = S.union (S.fromList es) (readerExtensions opts)
           , readerSmart = True
           }
    addWExt es opts =
      opts { writerExtensions = S.union (S.fromList es) (writerExtensions opts) }

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