110 lines
3.9 KiB
Haskell
110 lines
3.9 KiB
Haskell
{-# LANGUAGE NamedFieldPuns #-}
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{-# LANGUAGE OverloadedStrings #-}
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module Blog.Wording (
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Wording(..)
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, build
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) where
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import Arguments (Arguments(..))
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import Control.Monad (foldM)
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import Data.Aeson (ToJSON(..), (.=), object, pairs)
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import Data.List (intercalate)
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import Data.Map (Map, (!))
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import qualified Data.Map as Map (empty, fromList, map, union)
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import Data.Monoid ((<>))
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import Data.Text (Text)
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import qualified Data.Text as Text (pack, unpack)
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import Data.Text.Template (Template, renderA, showTemplate, templateSafe)
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import Paths_hablo (getDataFileName)
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import Text.ParserCombinators.Parsec (
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Parser
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, (<|>)
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, char, choice, endBy, eof, many, many1, noneOf, optional, parse, string, try
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)
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import System.Exit (die)
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data Wording = Wording {
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allLink :: Text
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, allPage :: Text
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, allTaggedPage :: Template
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, commentsSection :: Text
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, dateFormat :: Text
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, latestLink :: Text
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, latestPage :: Text
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, latestTaggedPage :: Template
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, metadata :: Text
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, tagsList :: Text
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}
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keys :: [String]
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keys = [
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"allLink", "allPage", "allTaggedPage", "commentsSection", "dateFormat"
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, "latestLink", "latestPage", "latestTaggedPage", "metadata", "tagsList"
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]
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values :: [Wording -> Text]
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values = [
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allLink, allPage, showTemplate . allTaggedPage, commentsSection
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, dateFormat, latestLink, latestPage, showTemplate . latestTaggedPage
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, metadata, tagsList
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]
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texts :: Wording -> [Text]
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texts wording = ($ wording) <$> values
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instance ToJSON Wording where
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toJSON = object . zipWith (.=) (Text.pack <$> keys) . texts
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toEncoding = pairs . foldl (<>) mempty . zipWith (.=) (Text.pack <$> keys) . texts
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addWording :: Map String Text -> FilePath -> IO (Map String Text)
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addWording currentWording wordingFile = do
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parsed <- parse wordingP wordingFile <$> readFile wordingFile
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case parsed of
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Left errorMessage -> die $ show errorMessage
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Right newWording -> return $ Map.union currentWording newWording
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wordingP :: Parser (Map String Text)
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wordingP = Map.map Text.pack . Map.fromList <$>
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(many skip *> line `endBy` (many1 skip) <* eof)
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where
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restOfLine = many $ noneOf "\r\n"
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eol = try (string "\r\n") <|> string "\r" <|> string "\n"
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skip = optional (char '#' *> restOfLine) *> eol
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line = (,) <$> (choice (try . string <$> keys) <* equal) <*> restOfLine
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equal = many (char ' ') *> char '=' *> many (char ' ')
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checkTemplateWith :: [Text] -> String -> Map String Text -> IO Template
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checkTemplateWith variables key wording =
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let templateText = wording ! key in
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let testEnvironment = flip lookup [(s, "") | s <- variables] in
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case templateSafe templateText of
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Left (row, col) -> die $ syntaxError (show row) (show col)
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Right template ->
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maybe (die badTemplate) (return . const template) (renderA template testEnvironment)
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where
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availableVariables =
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" (available variables: " ++ intercalate ", " (Text.unpack <$> variables) ++ ")"
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syntaxError row col =
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"Syntax error in template for variable " ++ key ++ "at l." ++ row ++ ", c." ++ col
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badTemplate = "Invalid template for variable " ++ key ++ availableVariables
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build :: Arguments -> IO Wording
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build arguments = do
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defaultWording <- getDataFileName "defaultWording.conf"
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let wordingFiles = maybe id (:) (wording arguments) $ [defaultWording]
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wording <- foldM addWording Map.empty wordingFiles
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allTaggedPage <- checkTemplateWith ["tag"] "allTaggedPage" wording
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latestTaggedPage <- checkTemplateWith ["tag"] "latestTaggedPage" wording
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return Wording {
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allLink = wording ! "allLink"
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, allPage = wording ! "allPage"
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, allTaggedPage
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, commentsSection = wording ! "commentsSection"
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, dateFormat = wording ! "dateFormat"
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, latestLink = wording ! "latestLink"
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, latestPage = wording ! "latestPage"
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, latestTaggedPage
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, metadata = wording ! "metadata"
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, tagsList = wording ! "tagsList"
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}
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