Import("path.lua")
Import("utils.lua")

local _systems = {
	"Win32",
	"Unix"
}


-- Returns a string of all supported systems
function supported_systems()
	return table.concat(_systems, ', ')
end


-- Return True if 'value' is a supported system. False otherwise.
function valid_system(value)
	return contains(_systems, value)
end


-- Find what host system we are on.
-- Returns nil if system could not be determined.
function host_system()

	-- Check "platform" variable set by bam first.
	if platform == "win32" or platform == "win64" then
		return _systems[1]
	end
	if platform == "linux" then
		return _systems[2]
	end

	-- next, check if we are on windows by checking
	-- the 'OS' environment variable
	local win = os.getenv('OS')
	if win ~= nil and win:lower():match('windows') then
		return _systems[1]
	end

	return nil
end

function SetSettingsPrefix(settings, prefix)
	settings.labelprefix = string.format("[%s] ", prefix)
end

-- Copy settings with a optional label prefix.
function CopySettings(settings, prefix)
	local n = TableDeepCopy(settings)
	if prefix ~= nil then
		SetSettingsPrefix(n, prefix)
	end
	return n
end

-- Defines a module
--   path: base path to source files.
--   src: table of source files.
function Module(path, src)
	path = RelPath(path)
	local r = {}
	for k, v in pairs(src) do
		r[k] = PathJoin(path, v)
	end
	return r
end

-- Copy a directory src to dst
--   src = "path/to/a", dest = "path/to/b" -> the whole content
--   of "a" will be copied to "path/to/b"
function CopyDir(dst, src)
	local r = {}
	local base = PathDir(src)
	local files = CollectRecursive(Path(src) .. "/*")

	for k, v in pairs(files) do
		local rdir = PathDir(v:sub(base:len() + 1))
		r[k] = CopyToDirectory(PathJoin(dst, rdir), v)
	end
	return r
end