--
-- vs2010_vcxproj_filters.lua
-- Generate a Visual Studio 2010 C/C++ filters file.
-- Copyright (c) 2009-2011 Jason Perkins and the Premake project
--

	local vc2010 = premake.vstudio.vc2010
	local project = premake.project


--
-- The first portion of the filters file assigns unique IDs to each
-- directory or virtual group. Would be cool if we could automatically
-- map vpaths like "**.h" to an <Extensions>h</Extensions> element.
--

	function vc2010.filteridgroup(prj)
		local filters = { }
		local filterfound = false

		for file in project.eachfile(prj) do
			-- split the path into its component parts
			local folders = string.explode(file.vpath, "/", true)
			local path = ""
			for i = 1, #folders - 1 do
				-- element is only written if there *are* filters
				if not filterfound then
					filterfound = true
					_p(1,'<ItemGroup>')
				end

				path = path .. folders[i]

				-- have I seen this path before?
				if not filters[path] then
					filters[path] = true
					_p(2, '<Filter Include="%s">', path)
					_p(3, '<UniqueIdentifier>{%s}</UniqueIdentifier>', os.uuid())
					_p(2, '</Filter>')
				end

				-- prepare for the next subfolder
				path = path .. "\\"
			end
		end

		if filterfound then
			_p(1,'</ItemGroup>')
		end
	end


--
-- The second portion of the filters file assigns filters to each source
-- code file, as needed. Section is one of "ClCompile", "ClInclude",
-- "ResourceCompile", or "None".
--

	function vc2010.filefiltergroup(prj, section)
		local files = vc2010.getfilegroup(prj, section)
		if #files > 0 then
			_p(1,'<ItemGroup>')
			for _, file in ipairs(files) do
				local filter
				if file.name ~= file.vpath then
					filter = path.getdirectory(file.vpath)
				else
					filter = path.getdirectory(file.name)
				end

				if filter ~= "." then
					_p(2,'<%s Include=\"%s\">', section, path.translate(file.name, "\\"))
						_p(3,'<Filter>%s</Filter>', path.translate(filter, "\\"))
					_p(2,'</%s>', section)
				else
					_p(2,'<%s Include=\"%s\" />', section, path.translate(file.name, "\\"))
				end
			end
			_p(1,'</ItemGroup>')
		end
	end


--
-- Output the VC2010 filters file
--

	function vc2010.generate_filters(prj)
		io.indent = "  "
		vc2010.header()
			vc2010.filteridgroup(prj)
			vc2010.filefiltergroup(prj, "None")
			vc2010.filefiltergroup(prj, "ClInclude")
			vc2010.filefiltergroup(prj, "ClCompile")
			vc2010.filefiltergroup(prj, "ResourceCompile")
		_p('</Project>')
	end