gallery/make-pages/GalleryPage.hs

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{-# LANGUAGE TransformListComp #-}
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module GalleryPage (make) where
import Control.Exception
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import Data.Function (on)
import Data.List (sortOn, groupBy)
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import qualified Data.Text.Lazy as Lazy
import System.FilePath ((</>), takeDirectory)
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import GHC.Exts (Down (..), the)
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import BuilderQQ
import Depend (thumbFile)
import Info
newtype NoThumb = NoThumb FilePath
deriving stock Eq deriving anyclass Exception
instance Show NoThumb where show (NoThumb dir) = "no thumbnail for " ++ dir
make :: Text -- ^ title
-> Bool -- ^ nsfw is included?
-> [(FilePath, Info)]
-> Lazy.Text
make title nsfw infos = toLazyText $ make' title nsfw infos
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make' :: Text -> Bool -> [(FilePath, Info)] -> Builder
make' title nsfw infos = [b|@0
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<!DOCTYPE html>
<html lang=en>
<meta charset=utf-8>
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<link rel=stylesheet href=/style/tum/gallery.css>
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<link rel=alternate href=rss.xml type=application/rss+xml>
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<title>$*title</title>
<header>
<h1>$*title</h1>
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<h2 class="right corner">
<a href=rss.xml>rss</a>
</h2>
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</header>
<main>
<ul class=grid>
$4.items
</ul>
</main>
|]
where
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items = map (uncurry $ makeYearItems nsfw) infosByYear
infosByYear =
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[(the year, infopath) |
infopath@(_, info) <- infos,
then sortOn by Down info,
let year = #year info,
then group by Down year using groupBy']
groupBy' f = groupBy ((==) `on` f)
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makeYearItems :: Bool -- ^ nsfw
-> Integer -- ^ year
-> [(FilePath, Info)]
-> Builder
makeYearItems nsfw year infos = [b|@4
<li class="item year-marker">
<span class=year-text>$^year</span>
$4.items
|]
where items = map (uncurry $ makeItem nsfw) infos
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makeItem :: Bool -> FilePath -> Info -> Builder
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makeItem nsfw file info@(Info {title}) = [b|@4
<li $cls>
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<figure>
<a href="$@dir">
<img src="$@thumb">
</a>
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<figcaption>$*title</figcaption>
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</figure>
|]
where
dir = takeDirectory file
thumb = maybe (throw $ NoThumb dir) (\t -> dir </> thumbFile t) $ #thumb info
cls | nsfw && #anyNsfw info = [b|class="item nsfw"|]
| otherwise = [b|class=item|]