Verify that mkmodule is called with the correct module name.

library/lua/dfhack.lua

@@ -83,7 +83,27 @@ dfhack.exception.__index = dfhack.exception
 
 -- Module loading
 
+local function find_required_module_arg()
+    -- require -> module code -> mkmodule -> find_...
+    if debug.getinfo(4,'f').func == require then
+        return debug.getlocal(4, 1)
+    end
+    -- reload -> dofile -> module code -> mkmodule -> find_...
+    if debug.getinfo(5,'f').func == reload then
+        return debug.getlocal(5, 1)
+    end
+end
+
 function mkmodule(module,env)
+    -- Verify that the module name is correct
+    local _, rq_modname = find_required_module_arg()
+    if not rq_modname then
+        error('The mkmodule function must be used at the start of a module')
+    end
+    if rq_modname ~= module then
+        error('Found module '..module..' during require '..rq_modname)
+    end
+    -- Reuse the already loaded module table
     local pkg = package.loaded[module]
     if pkg == nil then
         pkg = {}
@@ -92,6 +112,7 @@ function mkmodule(module,env)
             error("Not a table in package.loaded["..module.."]")
         end
     end
+    -- Inject the plugin-exported functions when appropriate
     local plugname = string.match(module,'^plugins%.([%w%-]+)$')
     if plugname then
         dfhack.open_plugin(pkg,plugname)