Render old_name on farmland if name is not set.

changelog.md

@@ -3,6 +3,7 @@ This page describes changes made [here](https://github.com/SomeoneElseOSM/Someon
 
 ## As yet unreleased
 Render pitch=line as a white line.
+Render old_name on farmland if name is not set.
 
 ## 23/02/2022
 Show flowerbeds as green.

style.lua

@@ -363,6 +363,18 @@ function filter_tags_generic(keyvalues, nokeys)
       end
    end
 
+-- ----------------------------------------------------------------------------
+-- Render old names on farmland etc.
+-- ----------------------------------------------------------------------------
+   if ((( keyvalues["landuse"]  == "farmland"       )  or
+        ( keyvalues["natural"]  == "grassland"      )  or
+        ( keyvalues["natural"]  == "scrub"          )) and
+       (  keyvalues["name"]     == nil               ) and
+       (  keyvalues["old_name"] ~= nil               )) then
+      keyvalues["name"] = "(" .. keyvalues["old_name"] .. ")"
+      keyvalues["old_name"] = nil
+   end
+
 -- ----------------------------------------------------------------------------
 -- Rationalise the various trail_visibility values
 -- Also treat "overgrown=yes" as intermittent.  A discussion on talk-gb was