82 lines
2.3 KiB
Haskell
82 lines
2.3 KiB
Haskell
module RSS (make, make') where
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import Info
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import BuilderQQ
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import Records ()
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import Data.List (sortOn)
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import Data.Maybe (isJust)
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import Data.Ord (Down (..))
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import qualified Data.Text as Strict
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import qualified Data.Text.Lazy as Lazy
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import qualified Data.Time as Time
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import System.FilePath (takeDirectory)
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make :: Strict.Text -- ^ website root e.g. @https://gallery.niss.website@
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-> Strict.Text -- ^ title
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-> Strict.Text -- ^ description
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-> FilePath -- ^ gallery prefix e.g. @main@
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-> Maybe FilePath -- ^ output filename for self link
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-> [(FilePath, Info)]
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-> Lazy.Text
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make root title desc prefix output infos =
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toLazyText $ make' root title desc prefix output infos
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make' :: Strict.Text -> Strict.Text -> Strict.Text
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-> FilePath -> Maybe FilePath -> [(FilePath, Info)] -> Builder
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make' root title desc prefix output infos = [b|@0
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<?xml version="1.0" encoding="UTF-8"?>
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<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
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<channel>
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<title>$*title</title>
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<link>$link</link>
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<description>$*desc</description>
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$selflink
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$4.items
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</channel>
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</rss>
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|]
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where
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link = [b|$*root/$@prefix|]
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items = map (uncurry $ makeItem root prefix) $ sortOn (Down . #second) infos
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selflink = case output of
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Nothing -> ""
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Just o -> [b|<atom:link href="$link/$@o" rel="self" />|]
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makeItem :: Strict.Text -> FilePath -> FilePath -> Info -> Builder
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makeItem root prefix path (Info {title, desc, date, artist}) = [b|@4
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<item>
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<title>$*title</title>
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<link>$link</link>
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<guid>$link</guid>
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$descArtist'
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<pubDate>$date'</pubDate>
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</item>
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|]
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where
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dir = takeDirectory path
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link = [b|$*root/$@prefix/$@dir|]
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artist' = ifJust artist \case
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Artist {name, url = Nothing} -> [b|<p>by $*name|]
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Artist {name, url = Just url} -> [b|<p>by <a href=$*url>$*name</a>|]
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desc' = ifJust desc \d -> [b|$10*d|]
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descArtist' = if isJust desc || isJust artist then [b|@6
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<description>
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<![CDATA[
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$desc'
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$artist'
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]]>
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</description>
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|]
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else ""
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date' = formatDate date
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formatDate :: Day -> Builder
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formatDate d =
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fromString $ Time.formatTime Time.defaultTimeLocale format $
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Time.UTCTime d 15669
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where
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format = "%a, %d %b %_Y %T GMT"
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