re-structure

pandoc-filters/shift-numbering.lua

@@ -0,0 +1,20 @@
+-- Based on https://github.com/jgm/pandoc/issues/5071#issuecomment-856918980
+-- For LaTeX documents, shift all headings down by one.
+-- Make Level 1 unnumbered, or remove it if it contains the "hidden" class. (`# Title {.hidden}`)
+function Header(el)
+        if el.level == 1 then
+            --check for hidden class. (Why didn't pandoc make this a set? `{class_name = true}`)
+            for i, v in ipairs(el.classes) do
+                if v == "hidden" then
+                    --The empty list means remove the element
+                    return {}
+                end
+            end
+            -- this may mean that there are two unnumbered classes, but that doesn't matter.
+            el.classes[#el.classes + 1] = "unnumbered"
+        else
+            -- all headings > 1 are shifted down so that you don't end up with 0.x.y headings.
+            el.level = el.level - 1
+        end
+    return el
+end