105 lines
2.6 KiB
Haskell
105 lines
2.6 KiB
Haskell
{-# OPTIONS_GHC -Wno-orphans #-}
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module Info
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(Info (..), Image (..), Link (..),
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-- ** Reexports
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Day (..), Text)
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where
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import Data.YAML (FromYAML (..), (.:), (.:?), (.!=))
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import qualified Data.YAML as YAML
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import Data.Time.Calendar (Day (..))
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import Data.Text (Text)
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import qualified Data.Text as Text
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import qualified Data.Map.Strict as Map
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import Control.Applicative
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import Text.Read (readMaybe)
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data Info =
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Info {
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date :: !Day,
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title :: !(Maybe Text),
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tags :: ![Text],
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description :: !(Maybe Text),
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images :: ![Image],
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thumb :: !Text,
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links :: ![Link]
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}
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deriving (Eq, Show)
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data Image =
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Image {
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label :: !Text,
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path :: !Text,
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nsfw :: !Bool
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}
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deriving (Eq, Show)
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data Link =
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Link {
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title :: !Text,
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url :: !Text,
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nsfw :: !Bool
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}
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deriving (Eq, Show)
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instance FromYAML Info where
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parseYAML = YAML.withMap "info" \m ->
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Info <$> m .: "date"
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<*> m .:? "title"
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<*> m .:? "tags" .!= []
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<*> m .:? "description"
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<*> m .: "images"
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<*> m .: "thumb"
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<*> m .:? "links" .!= []
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instance FromYAML Image where
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parseYAML = labelledOptNsfw Image "path" "path"
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instance FromYAML Link where
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parseYAML = labelledOptNsfw Link "url" "url"
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data Pair a b = Pair !a !b
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instance (FromYAML a, FromYAML b) => FromYAML (Pair a b) where
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parseYAML =
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YAML.withMap "single-pair map" \m ->
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case Map.toList m of
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[(a, b)] -> Pair <$> parseYAML a <*> parseYAML b
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_ -> fail "expected exactly one pair"
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data OptNsfw a = NoNsfw !a | WithNsfw !a !Bool
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appOptNsfw :: (a -> Bool -> b) -> OptNsfw a -> b
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appOptNsfw f (NoNsfw x) = f x False
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appOptNsfw f (WithNsfw x n) = f x n
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labelledOptNsfw :: FromYAML a
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=> (Text -> a -> Bool -> b)
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-> String -- ^ name in \"expected\" message
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-> Text -- ^ field name
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-> YAML.Node YAML.Pos -> YAML.Parser b
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labelledOptNsfw f name field y = do
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Pair l n' <- parseYAML y
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n <- parseOptNsfw name field n'
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pure $ appOptNsfw (f l) n
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parseOptNsfw :: FromYAML a
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=> String -- ^ name in \"expected\" message
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-> Text -- ^ field name
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-> YAML.Node YAML.Pos -> YAML.Parser (OptNsfw a)
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parseOptNsfw name field y = yes y <|> no y where
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yes = YAML.withMap (name <> " & nsfw") \m ->
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WithNsfw <$> m .: field
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<*> m .:? "nsfw" .!= False
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no = fmap NoNsfw . parseYAML
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instance FromYAML Day where
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parseYAML = YAML.withStr "date" \str ->
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case readMaybe $ Text.unpack str of
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Just d -> pure d
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Nothing -> fail $ "couldn't parse date " ++ show str
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