update

latex/header.lua

@@ -0,0 +1,16 @@
+require("lualibs.lua")
+local file = io.open('../package.json')
+local jsonstring = file:read('*a')
+file:close()
+jsondata =  utilities.json.tolua(jsonstring)
+
+function addHeader()
+  if jsondata["watermark"] ~= nil and jsondata["watermark"] ~= false then
+    tex.print("\\usepackage{draftwatermark}")
+    tex.print("\\SetWatermarkLightness{0.9}")
+    tex.print("\\SetWatermarkScale{6}")
+    if jsondata["watermark"] ~= true then
+      tex.print("\\SetWatermarkText{" .. jsondata["watermark"] .. "}")
+    end
+  end
+end