Bugfix

font_api/fontform.lua

@@ -54,15 +54,15 @@ local function show_node_formspec(playername, pos)
 	fs = fs:gsub("context", nodemeta)
 
 	-- Change all ${} to their corresponding metadata values
-	local s, e
-	repeat
-		s, e = fs:find('%${.*}')
-		if s and e then
-			fs = fs:sub(1, s-1)..
-				minetest.formspec_escape(meta:get_string(fs:sub(s+2,e-1)))..
-				fs:sub(e+1)
+	fs = fs:gsub("(.)${(.*)}", function(prefix, key)
+		-- Don't alter escaped keys
+		if prefix == "\\" then
+			return prefix .. "${" .. key .. "}"
 		end
-	until s == nil
+
+		-- Get the node meta value
+		return prefix .. minetest.formspec_escape(meta:get_string(key))
+	end)
 
 	local context = get_context(playername)
 	context.node_pos = pos

signs_api/init.lua

@@ -28,6 +28,11 @@ local FS = function(...) return minetest.formspec_escape(S(...)) end
 
 function signs_api.set_display_text(pos, text, font)
 	local meta = minetest.get_meta(pos)
+	-- Horrible workaround to prevent the engine from trying to resolve
+	-- metadata keys
+	if text:sub(1, 2) == "${" and text:sub(-1) == "}" then
+		text = text .. " "
+	end
 	meta:set_string("display_text", text)
 	if text and text ~= "" then
 		meta:set_string("infotext", "\""..text.."\"")