gallery/make-pages/RSS.hs

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module RSS (make, make') where
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import Date
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import Info
import BuilderQQ
import Records ()
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import Data.List (sortBy)
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import Data.Maybe (isJust)
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import Data.Function (on)
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import qualified Data.Text as Strict
import qualified Data.Text.Lazy as Lazy
import System.FilePath (takeDirectory)
make :: Strict.Text -- ^ website root e.g. @https://gallery.niss.website@
-> GalleryInfo
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-> Maybe FilePath -- ^ output filename for self link
-> [(FilePath, Info)]
-> Lazy.Text
make root ginfo output infos =
toLazyText $ make' root ginfo output infos
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make' :: Strict.Text -> GalleryInfo
-> Maybe FilePath -> [(FilePath, Info)] -> Builder
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make' root ginfo@(GalleryInfo {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>
<title>$title</title>
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<link>$link</link>
<description>$desc</description>
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$selflink
$4.items
</channel>
</rss>
|]
where
link = [b|$root/$prefix|]
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nsfw = #nsfw ginfo
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items = map (uncurry $ makeItem root prefix nsfw) $
sortBy (flip (compareFor nsfw `on` #second)) $
filter (not . #unlisted . snd) infos
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selflink = case output of
Nothing -> ""
Just o -> [b|<atom:link href="$link/$o" rel="self" />|]
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makeItem :: Strict.Text -> FilePath -> Bool -> FilePath -> Info -> Builder
makeItem root prefix nsfw path i@(Info {title, date, artist}) = [b|@4
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<item>
<title>$title</title>
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<link>$link</link>
<guid>$link</guid>
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$descArtist'
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<pubDate>$date'</pubDate>
</item>
|]
where
dir = takeDirectory path
link = [b|$root/$prefix/$dir|]
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artist' = ifJust artist \case
Artist {name, url = Nothing} -> [b|<p>by $name|]
Artist {name, url = Just url} -> [b|<p>by <a href=$url>$name</a>|]
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desc = descFor nsfw i
desc' = makeDesc desc
descArtist' = if #exists desc || isJust artist then [b|@6
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<description>
<![CDATA[
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$10.desc'
$10.artist'
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]]>
</description>
|]
else ""
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date' = formatRSS date
makeDesc :: Desc -> Builder
makeDesc NoDesc = ""
makeDesc (TextDesc txt) = [b|$txt|]
makeDesc (LongDesc fs) = [b|$fields|]
where
fields = map makeField fs
makeField (DescField {name, text}) = [b|<b>$name</b>: $text|]