45cb8dc428
This currently contains have_file, read_file, canonical_path, get_image_size, and new functions that work with binary_path files.
70 lines
1.9 KiB
Lua
70 lines
1.9 KiB
Lua
-- Note: This file is loaded automatically by the engine.
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local mt = {
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__index = function(self, k)
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if k ~= "__tostring" then
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error("Tried to access an empty package", 2)
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end
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end,
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__newindex = function()
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error("Tried to access an empty package", 2)
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end,
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__metatable = "empty package",
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__tostring = function() return "{empty package}" end,
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}
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local empty_pkg = setmetatable({}, mt)
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local function resolve_package(pkg_name)
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pkg_name = filesystem.canonical_path(pkg_name)
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if pkg_name[#pkg_name] == '/' then
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pkg_name = pkg_name:sub(1, -2)
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end
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if filesystem.have_file(pkg_name) then return pkg_name end
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if pkg_name:sub(-4) ~= ".lua" then
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local test = resolve_package(pkg_name .. ".lua")
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if test then return test end
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end
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if pkg_name:sub(1, 4) ~= "lua/" then
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if filesystem.have_file("lua/" .. pkg_name) then
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return "lua/" .. pkg_name
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end
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end
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if pkg_name:sub(1, 2) ~= "./" then
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if filesystem.have_file("./" .. pkg_name) then
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return "./" .. pkg_name
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end
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end
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return nil
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end
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function wesnoth.require(pkg_name)
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-- First, check if the package is already loaded
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local loaded_name = resolve_package(pkg_name)
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if loaded_name and wesnoth.package[loaded_name] then
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return wesnoth.package[loaded_name]
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end
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if not loaded_name then
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wesnoth.log("err", "Failed to load required package: " .. pkg_name, true)
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return nil
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end
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-- Next, if it's a single file, load the package with dofile
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if filesystem.have_file(loaded_name, true) then
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local pkg = wesnoth.dofile(loaded_name)
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wesnoth.package[loaded_name] = pkg or empty_pkg
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return pkg
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else -- If it's a directory, load all the files therein
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local files = filesystem.read_file(loaded_name)
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local pkg = {}
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for i = files.ndirs + 1, #files do
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if files[i]:sub(-4) == ".lua" then
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local subpkg_name = files[i]:sub(1, -5)
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pkg[subpkg_name] = wesnoth.require(loaded_name .. '/' .. files[i])
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end
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end
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wesnoth.package[loaded_name] = pkg
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return pkg
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end
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end
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return empty_pkg
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