Add assert() around loadfile() invocations

src/data.lua

@@ -12,4 +12,4 @@ if i < #arg then
   tex.error("zu viele Argumente. Erstes überflüssiges Argument: '" .. tostring(arg[i+1]) .. "'")
 end
 
-return loadfile("values.lua", "t")(arg[i])
+return assert(loadfile("values.lua", "t"))(arg[i])

src/tools.lua

@@ -33,7 +33,7 @@ elseif arg[curarg] ~= nil then
 end
 
 local d = require("schemadef")
-local schema = loadfile("schema.lua", "t")(true)
+local schema = assert(loadfile("schema.lua", "t"))(true)
 
 if gendoc then
   if standalone then
@@ -94,7 +94,7 @@ end
 if validate then
   local res = 0
   local prev_pcount = 0
-  local values = loadfile("values.lua")
+  local values = assert(loadfile("values.lua", "t"))
   for i = curarg + 1,#arg do
     values(arg[i])
   end

src/values.lua

@@ -1,5 +1,5 @@
 local d = require("schemadef")
-local schema = loadfile("schema.lua", "t")(false)
+local schema = assert(loadfile("schema.lua", "t"))(false)
 local skt = require("skt")
 
 local input = ...