From 3d55107e8b01d5aab84d5acc44e5dae29d2af44e Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Sat, 14 Jun 2025 18:06:06 +0200
Subject: add and use filter to render ingress text

---
 _extensions/js/ingress/ingress.lua | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 _extensions/js/ingress/ingress.lua

(limited to '_extensions/js/ingress/ingress.lua')

diff --git a/_extensions/js/ingress/ingress.lua b/_extensions/js/ingress/ingress.lua
new file mode 100644
index 0000000..1f584b6
--- /dev/null
+++ b/_extensions/js/ingress/ingress.lua
@@ -0,0 +1,27 @@
+-- Translate div class .lead to custo LaTeX environment \ingress{}
+
+local function escape_latex(str)
+  local replacements = {
+    ["\\"] = "\\textbackslash{}",
+    ["{"] = "\\{",
+    ["}"] = "\\}",
+    ["$"] = "\\$",
+    ["&"] = "\\&",
+    ["#"] = "\\#",
+    ["_"] = "\\_",
+    ["%"] = "\\%",
+    ["^"] = "\\textasciicircum{}",
+    ["~"] = "\\textasciitilde{}"
+  }
+  return (str:gsub(".", function(c)
+    return replacements[c] or c
+  end))
+end
+
+function Div(el)
+  if el.classes:includes('lead') then
+    local content = pandoc.utils.stringify(el.content)
+    local escaped_content = escape_latex(content)
+    return pandoc.RawBlock('latex', '\\ingress{' .. escaped_content .. '}')
+  end
+end
-- 
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