2 files changed, 35 insertions, 0 deletions
diff --git a/_extensions/js/ingress/_extension.yml b/_extensions/js/ingress/_extension.yml
new file mode 100644
index 0000000..4655adc
--- /dev/null
+++ b/_extensions/js/ingress/_extension.yml
@@ -0,0 +1,6 @@
+title: Ingress
+author: Jonas Smedegaard
+version: 0.0.1
+contributes:
+  filters:
+    - ingress.lua
diff --git a/_extensions/js/ingress/ingress.lua b/_extensions/js/ingress/ingress.lua
new file mode 100644
index 0000000..3c2c429
--- /dev/null
+++ b/_extensions/js/ingress/ingress.lua
@@ -0,0 +1,29 @@
+-- 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 FORMAT:match 'latex' then
+    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
+end