gallery/make-pages/RSS.hs

80 lines
2.2 KiB
Haskell
Raw Normal View History

2020-07-19 12:04:40 -04:00
module RSS (make, make') where
import Info
import BuilderQQ
import Records ()
import Data.List (sortOn)
2020-07-25 07:58:16 -04:00
import Data.Maybe (isJust)
2020-07-19 12:04:40 -04:00
import Data.Ord (Down (..))
import qualified Data.Text as Strict
import qualified Data.Text.Lazy as Lazy
import qualified Data.Time as Time
import System.FilePath (takeDirectory)
make :: Strict.Text -- ^ website root e.g. @https://gallery.niss.website@
-> GalleryInfo
2020-07-19 12:04:40 -04:00
-> Maybe FilePath -- ^ output filename for self link
-> [(FilePath, Info)]
-> Lazy.Text
make root ginfo output infos =
toLazyText $ make' root ginfo output infos
2020-07-19 12:04:40 -04:00
make' :: Strict.Text -> GalleryInfo
-> Maybe FilePath -> [(FilePath, Info)] -> Builder
make' root (GalleryInfo {title, desc, prefix}) output infos = [b|@0
2020-07-19 12:04:40 -04:00
<?xml version="1.0" encoding="UTF-8"?>
2020-07-25 07:58:16 -04:00
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
2020-07-19 12:04:40 -04:00
<channel>
<title>$title</title>
2020-07-19 12:04:40 -04:00
<link>$link</link>
<description>$desc</description>
2020-07-19 12:04:40 -04:00
$selflink
$4.items
</channel>
</rss>
|]
where
link = [b|$root/$prefix|]
2020-07-19 12:04:40 -04:00
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" />|]
2020-07-19 12:04:40 -04:00
makeItem :: Strict.Text -> FilePath -> FilePath -> Info -> Builder
2020-07-25 07:58:16 -04:00
makeItem root prefix path (Info {title, desc, date, artist}) = [b|@4
2020-07-19 12:04:40 -04:00
<item>
<title>$title</title>
2020-07-19 12:04:40 -04:00
<link>$link</link>
<guid>$link</guid>
2020-07-25 07:58:16 -04:00
$descArtist'
2020-07-19 12:04:40 -04:00
<pubDate>$date'</pubDate>
</item>
|]
where
dir = takeDirectory path
link = [b|$root/$prefix/$dir|]
2020-07-25 07:58:16 -04:00
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|]
2020-07-25 07:58:16 -04:00
descArtist' = if isJust desc || isJust artist then [b|@6
<description>
<![CDATA[
$desc'
$artist'
]]>
</description>
|]
else ""
2020-07-19 12:04:40 -04:00
date' = formatDate date
formatDate :: Day -> Builder
formatDate d =
fromString $ Time.formatTime Time.defaultTimeLocale format $
Time.UTCTime d 15669
where
format = "%a, %d %b %_Y %T GMT"