add my next info lesson in 7B

Allow markdown to use meta data variables with %VARNAME% syntax.

1 files changed, 19 insertions, 0 deletions

diff --git a/pandoc/filters/meta-vars.lua b/pandoc/filters/meta-vars.lua
new file mode 100644
index 00000000..9122775b
--- /dev/null
+++ b/pandoc/filters/meta-vars.lua
@@ -0,0 +1,19 @@
+local vars = {}
+
+function get_vars (meta)
+  for k, v in pairs(meta) do
+    if pandoc.utils.type(v) == 'Inlines' then
+      vars["%" .. k .. "%"] = {table.unpack(v)}
+    end
+  end
+end
+
+function replace (el)
+  if vars[el.text] then
+    return pandoc.Span(vars[el.text])
+  else
+    return el
+  end
+end
+
+return {{Meta = get_vars}, {Str = replace}}