gallery/make-pages/RSS.hs

72 lines
2 KiB
Haskell

module RSS (make, make') where
import Date
import Info
import BuilderQQ
import Records ()
import Data.List (sortOn)
import Data.Maybe (isJust)
import Data.Ord (Down (..))
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
-> Maybe FilePath -- ^ output filename for self link
-> [(FilePath, Info)]
-> Lazy.Text
make root ginfo output infos =
toLazyText $ make' root ginfo output infos
make' :: Strict.Text -> GalleryInfo
-> Maybe FilePath -> [(FilePath, Info)] -> Builder
make' root (GalleryInfo {title, desc, prefix}) output infos = [b|@0
<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<title>$title</title>
<link>$link</link>
<description>$desc</description>
$selflink
$4.items
</channel>
</rss>
|]
where
link = [b|$root/$prefix|]
items = map (uncurry $ makeItem root prefix) $ sortOn (Down . #second) infos
selflink = case output of
Nothing -> ""
Just o -> [b|<atom:link href="$link/$o" rel="self" />|]
makeItem :: Strict.Text -> FilePath -> FilePath -> Info -> Builder
makeItem root prefix path (Info {title, desc, date, artist}) = [b|@4
<item>
<title>$title</title>
<link>$link</link>
<guid>$link</guid>
$descArtist'
<pubDate>$date'</pubDate>
</item>
|]
where
dir = takeDirectory path
link = [b|$root/$prefix/$dir|]
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>|]
desc' = ifJust desc \d -> [b|$10.d|]
descArtist' = if isJust desc || isJust artist then [b|@6
<description>
<![CDATA[
$desc'
$artist'
]]>
</description>
|]
else ""
date' = formatRSS date