52 lines
1.7 KiB
Lua
52 lines
1.7 KiB
Lua
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--- Loads configurations from files on demand.
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-- @author DarkWiiPlayer
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-- @license Unlicense
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local lfs = require 'lfs'
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local config = {}
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local __metatable = {}
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function __metatable:__index(index)
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if type(index)~="string" then return nil end
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local path = self.__dir..'/'..index
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local attributes = lfs.attributes(path)
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if attributes and attributes.mode=='directory' then
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return config.bind(path, self.__loaders)
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else
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for _, loader in ipairs(self.__loaders) do
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local result = loader(path)
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if result then
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rawset(self, index, result)
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return result
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end
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end
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return nil, "Could not load: "..tostring(index)
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end
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end
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--- Binds a table to a config directory.
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-- The returned table maps keys to configurations, which are handled by
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-- different "loaders". loaders are handlers that try loading a config entry in
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-- a certain format and are tried sequentially until one succeeds. If no
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-- loader matches, nil is returned.
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-- @tparam string dir Path to the directory to look in.
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-- @tparam table loaders A table of loaders to use when attempting to load a configuration entry.
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-- @treturn table config A table that maps to the config directory
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-- @usage
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-- local config = glass.bind 'configurations'
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-- main_config.foo.bar
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-- -- Loads some file like foo.json or foo.yaml
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-- -- in the configurations directory
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function config.bind(dir, loaders)
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if type(dir)~="string" then
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error(string.format("bad argument #1 to '%s' (string expected, got %s)", debug.getinfo(1).name, type(loaders)), 2)
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end
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if type(loaders)~="table" then
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error(string.format("bad argument #2 to '%s' (table expected, got %s)", debug.getinfo(1).name, type(loaders)), 2)
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end
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return setmetatable({__dir=dir, __loaders=loaders}, __metatable)
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end
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return config
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