1-- Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org> 2-- 3-- This software is provided 'as-is', without any express or implied 4-- warranty. In no event will the authors be held liable for any damages 5-- arising from the use of this software. 6-- 7-- Permission is granted to anyone to use this software for any purpose, 8-- including commercial applications, and to alter it and redistribute it 9-- freely. 10-- 11-- Meta-build system using premake created and maintained by 12-- Benjamin Henning <b.henning@digipen.edu> 13 14-- This is kept just for windows because the other platforms use different means 15-- for determining dependence or compatibility. 16 17--[[ 18sdl_depends.lua 19 20 This file simply contains a function for determining whether a dependency 21 exists on the Windows platform, given a possible environmental variable, 22 delimited search paths, and a main and/or sub-directory paths for more 23 elaborate pattern matching. 24]] 25 26-- find_dependency_dir_windows(env, main_search_path, main_dir_path) 27-- Attempt to resolve a dependency (true or false) folder based on either an 28-- environmental variable, start search path, or both. If both are present, 29-- the environmental variable will be preferred. If neither are present, this 30-- function returns false. 31-- 32-- Arguments: 33-- env The name of the environmental variable to treat as a path 34-- main_search_paths Paths to look for the main directory in 35-- main_dir_path The a path that must be contained between main_search_path and sub_dir_path 36-- sub_dir_path The path of the directories that should exist at the searched path 37function find_dependency_dir_windows(env, main_search_paths, main_dir_path, sub_dir_path) 38 if not os.is("windows") then -- if not windows, then fail 39 return false 40 end 41 if env == nil and (main_search_paths == nil or #main_search_paths == 0) then 42 return false 43 end 44 local env_path = nil 45 local main_path = nil 46 if env ~= nil then env_path = os.getenv(env) end 47 local search_table = { n = 0 } 48 if main_search_paths ~= nil then 49 for k,main_search_path in ipairs(explode(main_search_paths, ";")) do 50 local directories = os.matchdirs(main_search_path .. "/**" .. main_dir_path .. "*") 51 for k,v in pairs(directories) do 52 table.insert(search_table, v) 53 end 54 end 55 end 56 if env_path ~= nil then table.insert(search_table, env_path) end 57 local search_path = table.concat(search_table, ";") 58 local result_path = os.dirpathsearch(sub_dir_path, search_path, ";") 59 if result_path == nil then 60 return false 61 end 62 local found_dir = os.isdir(result_path) 63 local abs_path = path.getabsolute(result_path) 64 if found_dir and env_path ~= nil then 65 abs_path = abs_path:gsub("\\", "/") 66 env_path = env_path:gsub("\\", "/") 67 local pos = abs_path:indexOf(env_path) 68 if pos ~= nil then 69 abs_path = abs_path:sub(1, pos - 1) .. "$(" .. env .. ")/" .. abs_path:sub(pos + #env_path) 70 end 71 end 72 -- we want the path in terms of '/' 73 return found_dir, abs_path 74end 75