From 859e07942e3a3b4074513627a60513f0fa624154 Mon Sep 17 00:00:00 2001
From: Eugen Wissner <belka@caraus.de>
Date: Mon, 10 Aug 2026 15:26:21 +0200
Subject: Remove teasers that repeat the content

---
 src/Main.hs | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/Main.hs b/src/Main.hs
index 61a44b5..7dff99a 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -4,7 +4,7 @@
 module Main where
 
 import Control.Monad (forM)
-import Data.List (isPrefixOf, isSuffixOf)
+import Data.List (isPrefixOf, isSuffixOf, isInfixOf)
 import Data.Time.Format (TimeLocale(..))
 import Hakyll.Core.Compiler
     ( Compiler
@@ -53,10 +53,10 @@ import Hakyll.Web.Template.Context
     , boolField
     , constField
     , defaultContext
+    , field
     , listField
     , listFieldWith
     , dateFieldWith
-    , teaserField
     )
 import Hakyll.Web.Template.List (recentFirst, sortRecentFirst)
 import System.FilePath
@@ -174,10 +174,28 @@ localizedTimeLocale = TimeLocale
     , amPm = ("AM", "PM")
     }
 
+-- Reads teaser metadata field and formats it as HTML.
+teaserDescriptionField :: Context String
+teaserDescriptionField = field "teaser" withItem
+  where
+    withItem item =
+        let itemIdentifier' = itemIdentifier item
+         in getMetadataField itemIdentifier' "teaser"
+            >>= withMetadataField itemIdentifier'
+    paragraphMap "" = "</p><p>"
+    paragraphMap paragraph = paragraph
+    withMetadataField _ (Just teaser)
+        | "<p>" `isInfixOf` teaser = pure teaser
+        | otherwise = pure $ "<p>"
+            <> unlines (paragraphMap <$> lines teaser)
+            <> "</p>"
+    withMetadataField itemIdentifier' Nothing = fail
+        $ "No teaser defined for " <> show itemIdentifier'
+
 postCtx :: Tags -> Context String
 postCtx tags
     = dateFieldWith localizedTimeLocale "published" "%e. %B %Y"
-    <> teaserField "teaser" "content"
+    <> teaserDescriptionField
     <> flevumContext tags
 
 flevumContext :: Tags -> Context String
-- 
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