{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE ViewPatterns #-}

module Issue.Tag (Tag (..), extract) where

import Data.Maybe (catMaybes)
import Data.Text (Text)
import Data.Text qualified as T

data Tag = Tag Text Text deriving (Show)

extract :: Text -> [Tag]
extract =
  catMaybes
    . map
      ( ( \case
            ((T.uncons -> Just ('@', k)) : v) ->
              Just (Tag k (T.unwords v))
            _ -> Nothing
        )
          . T.words
      )
    . T.lines