From fd1475aaec33e717a3721679008bc42bb96d0998 Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fischer@muhq.space>
Date: Sun, 4 Oct 2026 15:41:41 +0200
Subject: pandoc allow markdown in LaTex environments

TODO: pass arguments to the LaTeX environments
---
 common.mk                           |  1 +
 pandoc/filters/div-class-to-env.lua | 31 +++++++++++++++++++++++++++++++
 templates/slides.md                 | 10 +++++-----
 3 files changed, 37 insertions(+), 5 deletions(-)
 create mode 100644 pandoc/filters/div-class-to-env.lua

diff --git a/common.mk b/common.mk
index 8726a163..f4ad4ebe 100644
--- a/common.mk
+++ b/common.mk
@@ -17,6 +17,7 @@ PANDOC_CITE_OPTIONS := --citeproc
 PANDOC_FILTER_OPTIONS := --lua-filter "$(PANDOC_FILTER_DIR)/include-files.lua"
 PANDOC_FILTER_OPTIONS += --lua-filter "$(PANDOC_FILTER_DIR)/center-img.lua"
 PANDOC_FILTER_OPTIONS += --lua-filter "$(PANDOC_FILTER_DIR)/meta-vars.lua"
+PANDOC_FILTER_OPTIONS += --lua-filter "$(PANDOC_FILTER_DIR)/div-class-to-env.lua"
 PANDOC_FILTER_OPTIONS += --filter pandoc-plot -M plot-configuration=$(PANDOC_DIR)/defaults/pandoc-plot.yml
 COMMON_PANDOC_OPTIONS := --data-dir="$(PANDOC_DIR)" --resource-path="$(COMMON_IMAGES):." $(PANDOC_FILTER_OPTIONS)
 PANDOC_XARGS ?=
diff --git a/pandoc/filters/div-class-to-env.lua b/pandoc/filters/div-class-to-env.lua
new file mode 100644
index 00000000..1a87777b
--- /dev/null
+++ b/pandoc/filters/div-class-to-env.lua
@@ -0,0 +1,31 @@
+--- div-class-to-env.lua – filter to convert classes to LaTeX environments
+---
+--- Copyright: © 2026 Florian Fischer
+--- License:   MIT – see LICENSE file for details
+
+if FORMAT:match('beamer') then
+  function Div(d)
+    -- ignore code blocks which are not of class "env".
+    if not d.classes:includes 'env' then
+      return
+    end
+
+    local env
+    for _, v in ipairs(d.classes) do
+      if v ~= 'env' then
+        env = v
+        break
+      end
+    end
+
+    if not env then
+      return
+    end
+
+    return {
+      pandoc.RawInline('latex', '\\begin{'..env..'}'),
+      d,
+      pandoc.RawInline('latex', '\\end{'..env..'}')
+    }
+  end
+end
diff --git a/templates/slides.md b/templates/slides.md
index 4c7e30c7..c03104c6 100644
--- a/templates/slides.md
+++ b/templates/slides.md
@@ -83,9 +83,9 @@ class AKTE {
 
 ## Some Text in custom tcolorboxes
 
-`\begin{merke}`{=latex}
-Der Grundsatz der \beamerpgap{2}{\boldred{Datenkapselung}} besagt, dass nur ein Objekt selbst Zugriff auf seine Attribute haben sollte.
-`\end{merke}`{=latex}
+:::{.env .merke}
+Der Grundsatz der \beamerpgap{2}{\boldred{Datenkapselung}} besagt, dass nur ein **Objekt** selbst Zugriff auf seine *Attribute* haben sollte.
+:::
 
 \pause\pause
 
@@ -95,13 +95,13 @@ Der Zugriff von außen sollte nur über durch das Objekt bereitgestellte Methode
 
 \pause
 
-`\begin{pseudocode}`{=latex}
-
+:::{.env .pseudocode}
 ```
 Solange du willst...
   Mache was.
 Mache was anderes.
 ```
+:::
 
 `\end{pseudocode}`{=latex}
 
-- 
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