Allow variable injection with punctuation

second-pass.lua

@@ -1,5 +1,7 @@
 local vars = {}
 
+local additionalChars = {".", ",", "!", ":", ";"}
+
 function fileExists(name)
     local f=io.open(name,"r")
     if f~=nil then io.close(f) return true else return false end
@@ -13,7 +15,13 @@ end
 local function getVars(meta)
     for k, v in pairs(meta) do
         if v.t == 'MetaInlines' then
-            vars["$" .. k .. "$"] = v
+            local var_key = "$" .. k .. "$"
+            local var_value = table.unpack(v)["c"]
+            vars[var_key] = var_value
+            for _, char in pairs(additionalChars) do
+                vars[var_key .. char] = var_value .. char
+                vars[char .. var_key] = char .. var_value
+            end
         end
     end
 end

test/main.md

@@ -1,3 +1,5 @@
 # Hello world
 
 \lipsum[3-56]
+
+Foo is equal to \$foo\$.