8a33ad0bf1
now wesnoth.require is able to detect when the same file is required two times using different names (like a/../a/b.lua a/b.lua) and will only execute it once. for this a new function wesnoth.canonical_path was added
70 lines
1.9 KiB
Lua
70 lines
1.9 KiB
Lua
-- Note: This file is loaded automatically by the engine.
|
|
|
|
local mt = {
|
|
__index = function(self, k)
|
|
if k ~= "__tostring" then
|
|
error("Tried to access an empty package", 2)
|
|
end
|
|
end,
|
|
__newindex = function()
|
|
error("Tried to access an empty package", 2)
|
|
end,
|
|
__metatable = "empty package",
|
|
__tostring = function() return "{empty package}" end,
|
|
}
|
|
local empty_pkg = setmetatable({}, mt)
|
|
|
|
local function resolve_package(pkg_name)
|
|
pkg_name = wesnoth.canonical_path(pkg_name)
|
|
if pkg_name[#pkg_name] == '/' then
|
|
pkg_name = pkg_name:sub(1, -2)
|
|
end
|
|
if wesnoth.have_file(pkg_name) then return pkg_name end
|
|
if pkg_name:sub(-4) ~= ".lua" then
|
|
local test = resolve_package(pkg_name .. ".lua")
|
|
if test then return test end
|
|
end
|
|
if pkg_name:sub(1, 4) ~= "lua/" then
|
|
if wesnoth.have_file("lua/" .. pkg_name) then
|
|
return "lua/" .. pkg_name
|
|
end
|
|
end
|
|
if pkg_name:sub(1, 2) ~= "./" then
|
|
if wesnoth.have_file("./" .. pkg_name) then
|
|
return "./" .. pkg_name
|
|
end
|
|
end
|
|
return nil
|
|
end
|
|
|
|
function wesnoth.require(pkg_name)
|
|
-- First, check if the package is already loaded
|
|
local loaded_name = resolve_package(pkg_name)
|
|
if loaded_name and wesnoth.package[loaded_name] then
|
|
return wesnoth.package[loaded_name]
|
|
end
|
|
if not loaded_name then
|
|
wesnoth.log("err", "Failed to load required package: " .. pkg_name, true)
|
|
return nil
|
|
end
|
|
|
|
-- Next, if it's a single file, load the package with dofile
|
|
if wesnoth.have_file(loaded_name, true) then
|
|
local pkg = wesnoth.dofile(loaded_name)
|
|
wesnoth.package[loaded_name] = pkg or empty_pkg
|
|
return pkg
|
|
else -- If it's a directory, load all the files therein
|
|
local files = wesnoth.read_file(loaded_name)
|
|
local pkg = {}
|
|
for i = files.ndirs + 1, #files do
|
|
if files[i]:sub(-4) == ".lua" then
|
|
local subpkg_name = files[i]:sub(1, -5)
|
|
pkg[subpkg_name] = wesnoth.require(loaded_name .. '/' .. files[i])
|
|
end
|
|
end
|
|
wesnoth.package[loaded_name] = pkg
|
|
return pkg
|
|
end
|
|
end
|
|
|
|
return empty_pkg
|