kc3-lang/SDL/premake/util/sdl_depends.lua

Branch : - branch - v2.28 - tag -

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  Commit

• Author : David Ludwig
  Date : 2014-04-09 21:29:19
  Hash : 3dcb451f
  Message : Added a README file regarding WinRT support To note, this file is currently formatted with CRLF line endings, rather than LF, to allow the file to be viewed with Notepad.

• premake/util/sdl_depends.lua

• -- Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
  --
  -- This software is provided 'as-is', without any express or implied
  -- warranty.  In no event will the authors be held liable for any damages
  -- arising from the use of this software.
  --
  -- Permission is granted to anyone to use this software for any purpose,
  -- including commercial applications, and to alter it and redistribute it
  -- freely.
  --
  -- Meta-build system using premake created and maintained by
  -- Benjamin Henning <b.henning@digipen.edu>
  
  -- This is kept just for windows because the other platforms use different means
  -- for determining dependence or compatibility.
  
  --[[
  sdl_depends.lua
  
  	This file simply contains a function for determining whether a dependency
  	exists on the Windows platform, given a possible environmental variable,
  	delimited search paths, and a main and/or sub-directory paths for more
  	elaborate pattern matching.
  ]]
  
  -- find_dependency_dir_windows(env, main_search_path, main_dir_path)
  --   Attempt to resolve a dependency (true or false) folder based on either an
  --   environmental variable, start search path, or both. If both are present,
  --   the environmental variable will be preferred. If neither are present, this
  --   function returns false.
  --
  --   Arguments:
  --     env                The name of the environmental variable to treat as a path
  --     main_search_paths  Paths to look for the main directory in
  --     main_dir_path      The a path that must be contained between main_search_path and sub_dir_path
  --     sub_dir_path       The path of the directories that should exist at the searched path
  function find_dependency_dir_windows(env, main_search_paths, main_dir_path, sub_dir_path)
  	if not os.is("windows") then -- if not windows, then fail
  		return false
  	end
  	if env == nil and (main_search_paths == nil or #main_search_paths == 0) then
  		return false
  	end
  	local env_path = nil
  	local main_path = nil
  	if env ~= nil then env_path = os.getenv(env) end
  	local search_table = { n = 0 }
  	if main_search_paths ~= nil then
  		for k,main_search_path in ipairs(explode(main_search_paths, ";")) do
  			local directories = os.matchdirs(main_search_path .. "/**" .. main_dir_path .. "*")
  			for k,v in pairs(directories) do
  				table.insert(search_table, v)
  			end
  		end
  	end
  	if env_path ~= nil then table.insert(search_table, env_path) end
  	local search_path = table.concat(search_table, ";")
  	local result_path = os.dirpathsearch(sub_dir_path, search_path, ";")
  	if result_path == nil then
  		return false
  	end
  	local found_dir = os.isdir(result_path)
  	local abs_path = path.getabsolute(result_path)
  	if found_dir and env_path ~= nil then
  		abs_path = abs_path:gsub("\\", "/")
  		env_path = env_path:gsub("\\", "/")
  		local pos = abs_path:indexOf(env_path)
  		if pos ~= nil then
  			abs_path = abs_path:sub(1, pos - 1) .. "$(" .. env .. ")/" .. abs_path:sub(pos + #env_path)
  		end
  	end
  	-- we want the path in terms of '/'
  	return found_dir, abs_path
  end