mirror of https://github.com/encounter/SDL.git
74 lines
2.9 KiB
Lua
74 lines
2.9 KiB
Lua
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-- Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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--
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-- This software is provided 'as-is', without any express or implied
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-- warranty. In no event will the authors be held liable for any damages
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-- arising from the use of this software.
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--
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-- Permission is granted to anyone to use this software for any purpose,
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-- including commercial applications, and to alter it and redistribute it
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-- freely.
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--
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-- Meta-build system using premake created and maintained by
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-- Benjamin Henning <b.henning@digipen.edu>
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-- This is kept just for windows because the other platforms use different means
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-- for determining dependence or compatibility.
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--[[
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sdl_depends.lua
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This file simply contains a function for determining whether a dependency
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exists on the Windows platform, given a possible environmental variable,
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delimited search paths, and a main and/or sub-directory paths for more
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elaborate pattern matching.
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]]
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-- find_dependency_dir_windows(env, main_search_path, main_dir_path)
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-- Attempt to resolve a dependency (true or false) folder based on either an
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-- environmental variable, start search path, or both. If both are present,
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-- the environmental variable will be preferred. If neither are present, this
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-- function returns false.
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--
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-- Arguments:
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-- env The name of the environmental variable to treat as a path
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-- main_search_paths Paths to look for the main directory in
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-- main_dir_path The a path that must be contained between main_search_path and sub_dir_path
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-- sub_dir_path The path of the directories that should exist at the searched path
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function find_dependency_dir_windows(env, main_search_paths, main_dir_path, sub_dir_path)
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if not os.is("windows") then -- if not windows, then fail
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return false
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end
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if env == nil and (main_search_paths == nil or #main_search_paths == 0) then
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return false
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end
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local env_path = nil
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local main_path = nil
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if env ~= nil then env_path = os.getenv(env) end
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local search_table = { n = 0 }
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if main_search_paths ~= nil then
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for k,main_search_path in ipairs(explode(main_search_paths, ";")) do
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local directories = os.matchdirs(main_search_path .. "/**" .. main_dir_path .. "*")
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for k,v in pairs(directories) do
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table.insert(search_table, v)
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end
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end
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end
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if env_path ~= nil then table.insert(search_table, env_path) end
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local search_path = table.concat(search_table, ";")
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local result_path = os.dirpathsearch(sub_dir_path, search_path, ";")
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if result_path == nil then
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return false
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end
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local found_dir = os.isdir(result_path)
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local abs_path = path.getabsolute(result_path)
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if found_dir and env_path ~= nil then
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abs_path = abs_path:gsub("\\", "/")
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env_path = env_path:gsub("\\", "/")
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local pos = abs_path:indexOf(env_path)
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if pos ~= nil then
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abs_path = abs_path:sub(1, pos - 1) .. "$(" .. env .. ")/" .. abs_path:sub(pos + #env_path)
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end
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end
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-- we want the path in terms of '/'
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return found_dir, abs_path
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end
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