Borrow some code from fonts-rpm-macros, to drop a dependant code to generate srpm

google-noto-fonts.spec

@@ -573,6 +573,37 @@ local function wordwrap(text)
   return output
 end
 
+-- A helper to close AppStream XML runs
+local function closetag(oldtag, newtag)
+  if (oldtag == nil) then
+    return ""
+  else
+    local output = "]]></" .. oldtag .. ">"
+    if (oldtag == "li") and (newtag ~= oldtag) then
+      output = output .. "</ul>"
+    end
+    return output
+  end
+end
+
+-- A helper to open AppStream XML runs
+local function opentag(oldtag, newtag)
+  if (newtag == nil) then
+    return ""
+  else
+    local output = "<" .. newtag .. "><![CDATA["
+    if (newtag == "li") and (newtag ~= oldtag) then
+      output = "<ul>" .. output
+    end
+    return output
+  end
+end
+
+-- A helper to switch AppStream XML runs
+local function switchtag(oldtag, newtag)
+  return closetag(oldtag, newtag) .. opentag(oldtag, newtag)
+end
+
 -- Reformat some text into something that can be included in an AppStream
 -- XML description
 local function txt2xml(text)