LÖVE

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-- Assuming a directory structure like so:
-- assets
-- └── sprites
--     ├── sprite1.png
--     └── creatures
--         └── human
--             ├── sprite2.png
--             └── sprite3.png 

-- Simply invoke GetAss using the following prototype: GetAss(dir, pattern, func) where:
--     "dir" is the path from the root game directory to the assets directory you want to parse,
--     "pattern" is a string.match pattern that tells GetAss which files to add to the table tree, and what to cut out of the filename when adding it to the tree,
--     "func" is the function that GetAss will call for each matched file like so: func(filepath), the return value of which will be added to the tree.

GetAss = require 'getass'

assets = GetAss("assets", ".png$", function(filepath) return love.graphics.newImage(filepath) end)

-- You can now access the file structure as a table-tree like so:
love.graphics.draw(assets.sprites.sprite1)
love.graphics.draw(assets.sprites.creatures.human.sprite2)
love.graphics.draw(assets.sprites.creatures.human.sprite3)

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function getass(dir, pattern, result)
  result = result or {}
  local filenames = love.filesystem.getDirectoryItems(dir)
  for index, filename in ipairs(filenames) do
    if filetype == "file" then
      ...
      table.insert(result, filepath)
    elseif filetype == "diectory" then
      getass(filepath, pattern, result)
    end
  end
  return result
end

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files = GetAss("assets", ".png$", function(filepath) return filepath end)

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local function loadcode(filepath)
	local f = love.filesystem.load(filepath)
	return f()
end

modules = GetAss("src", ".lua$", loadcode)

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function(filepath) return filepath end