122 lines
4.2 KiB
Haskell
122 lines
4.2 KiB
Haskell
module Utilities where
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import Config
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import Data.Aeson (Result (Error, Success))
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import qualified Data.Aeson as A
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import Data.Maybe (fromMaybe)
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import Data.Text (Text)
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import qualified Data.Text as T
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import Data.Time
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import Data.Yaml.Aeson
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import Development.Shake (Action)
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import qualified Development.Shake as Shake
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import Development.Shake.FilePath ((<.>), (</>))
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import qualified Development.Shake.FilePath as Shake
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import Text.Pandoc (Block (Plain), Meta (..), MetaValue (..), Pandoc (..))
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import qualified Text.Pandoc as Pandoc
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import Types
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indexHtmlOutputPath :: FilePath -> FilePath
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indexHtmlOutputPath srcPath =
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outputDir </> Shake.dropExtension srcPath </> "index.html"
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-- were applicative shenanigans necessary? no
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-- but using them felt cool
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indexHtmlSourcePaths :: FilePath -> [FilePath]
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indexHtmlSourcePaths path = [indexHtmlTypstSourcePath, indexHtmlMarkdownSourcePath] <*> [path]
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indexHtmlTypstSourcePath :: FilePath -> FilePath
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indexHtmlTypstSourcePath =
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Shake.dropDirectory1
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. (<.> "typ")
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. Shake.dropTrailingPathSeparator
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. Shake.dropFileName
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indexHtmlMarkdownSourcePath :: FilePath -> FilePath
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indexHtmlMarkdownSourcePath =
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Shake.dropDirectory1
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. (<.> "md")
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. Shake.dropTrailingPathSeparator
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. Shake.dropFileName
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indexHtmlTypstMetaPath :: FilePath -> FilePath
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indexHtmlTypstMetaPath = typstMetaPath . indexHtmlTypstSourcePath
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typstMetaPath :: FilePath -> FilePath
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typstMetaPath typstPath = Shake.dropExtension typstPath <.> "yaml"
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typstToHtml :: FilePath -> Action Text
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typstToHtml filePath = do
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content <- Shake.readFile' filePath
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Shake.quietly . Shake.traced "Typst to HTML" $ do
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doc <- runPandoc . Pandoc.readTypst readerOptions . T.pack $ content
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html <- runPandoc . Pandoc.writeHtml5String writerOptions $ doc
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return html
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where
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readerOptions =
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Pandoc.def {Pandoc.readerExtensions = Pandoc.pandocExtensions}
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writerOptions =
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Pandoc.def {Pandoc.writerExtensions = Pandoc.pandocExtensions}
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markdownToHtml :: (FromJSON a) => FilePath -> Action (a, Text)
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markdownToHtml filePath = do
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content <- Shake.readFile' filePath
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Shake.quietly . Shake.traced "Markdown to HTML" $ do
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pandoc@(Pandoc meta _) <-
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runPandoc . Pandoc.readMarkdown readerOptions . T.pack $ content
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-- WARNING markdown needs to have no whitespace before/after dashes
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-- print meta
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meta' <- fromMeta meta
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html <- runPandoc . Pandoc.writeHtml5String writerOptions $ pandoc
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return (meta', html)
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where
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readerOptions =
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Pandoc.def
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{ Pandoc.readerStandalone = True,
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Pandoc.readerExtensions = Pandoc.enableExtension Pandoc.Ext_yaml_metadata_block Pandoc.pandocExtensions
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}
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writerOptions =
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Pandoc.def {Pandoc.writerExtensions = Pandoc.pandocExtensions}
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fromMeta (Meta meta) =
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A.fromJSON . A.toJSON <$> traverse metaValueToJSON meta >>= \case
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Success res -> pure res
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Error err -> fail $ "json conversion error:" <> err
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metaValueToJSON = \case
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MetaMap m -> A.toJSON <$> traverse metaValueToJSON m
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MetaList m -> A.toJSONList <$> traverse metaValueToJSON m
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MetaBool m -> pure $ A.toJSON m
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MetaString m -> pure $ A.toJSON $ T.strip m
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MetaInlines m -> metaValueToJSON $ MetaBlocks [Plain m]
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MetaBlocks m ->
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fmap (A.toJSON . T.strip)
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. runPandoc
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. Pandoc.writePlain Pandoc.def
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$ Pandoc mempty m
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runPandoc :: Pandoc.PandocIO b -> IO b
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runPandoc action =
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Pandoc.runIO (Pandoc.setVerbosity Pandoc.ERROR >> action)
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>>= either (fail . show) return
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yamlToPost :: FilePath -> Action Post
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yamlToPost path = do
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post <- decodeFileThrow path
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let post' = dateTransform post
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return $ fromMaybe post post'
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where
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dateTransform post@(Post {postDate}) = do
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postDate' <- postDate
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let postDate'' = dateStrTransform $ T.unpack postDate'
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Just
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post
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{ postDate = postDate''
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}
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dateStrTransform date = do
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date' <- parseTimeM False defaultTimeLocale "%Y-%-m-%-d" date
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Just $ T.pack $ formatTime @UTCTime defaultTimeLocale "%b %e, %Y" date'
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isTypstPost :: FilePath -> Bool
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isTypstPost path = Shake.takeExtension path == ".typ"
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isMarkdownPost :: FilePath -> Bool
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isMarkdownPost path = Shake.takeExtension path == ".md"
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