test file for pull request https://github.com/darktable-org/darktable/pull/228

rc.lua

-- easy access variables
dt=require("darktable")
table = require "table"
debug = require "debug"
require "darktable.debug"

--dt.debug.debug = true
function test_fn(name,...)
	print("*****  "..name.." ****")
	params = {...}
	print(dt.debug.dump(params,"parameters"))
	return ...;
end
function get_trace_fn(name) 
	return function(...) return test_fn(name,...) end
end

dt.register_storage("lua_storage","lua storage",
function(storage,image,format,filename,num,total,hq)
	--print(dt.debug.dump(storage),"storage")
	for k,v in pairs(storage) do
		print(k)
	end
	--print(dt.debug.dump(num),"num")
	storage[num] = "exists"
	storage[filename] = "exists"
end,
function(storage)
	print(dt.debug.dump(storage))
end
)