SolutionItems.lua

-- REF: https://github.com/premake/premake-core/issues/1061#issuecomment-1472057890
require("vstudio")
premake.api.register {
	name = "solutionitems",
	scope = "workspace",
	kind = "table",
}
function recursiveSolutionItemsProject(wks, tbl)
	for _, file in pairs(tbl) do
		if type(_) ~= "number" then

			local name = _
			local tbl = file
			premake.push('Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "'..name..'", "'..name..'", "{' .. os.uuid("Solution Items:"..wks.name..":"..name) .. '}"')
			premake.push("ProjectSection(SolutionItems) = preProject")

			local children = false

			for _, file in pairs(file) do
				if type(_) == "number" and type(file) == "string" then
					for _, file in ipairs(os.matchfiles(file)) do
						file = path.rebase(file, ".", wks.location)
						premake.w(file.." = "..file)
					end
				end

				if type(_) ~= "number" then
					children = true
				end
			end

			premake.pop("EndProjectSection")
			premake.pop("EndProject")

			if children then
				recursiveSolutionItemsProject(wks, tbl)
			end
		end
	end
end
premake.override(premake.vstudio.sln2005, "projects", function(base, wks)
	if wks.solutionitems and #wks.solutionitems > 0 then
		-- root level
		premake.push('Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{' .. os.uuid("Solution Items:"..wks.name) .. '}"')
		premake.push("ProjectSection(SolutionItems) = preProject")
		for _, file in pairs(wks.solutionitems) do
			if type(_) == "number" and type(file) == "string" then
				for _, file in ipairs(os.matchfiles(file)) do
					file = path.rebase(file, ".", wks.location)
					premake.w(file.." = "..file)
				end
			end
		end
		premake.pop("EndProjectSection")
		premake.pop("EndProject")
		-- subprojects
		recursiveSolutionItemsProject(wks, wks.solutionitems)
	end
	base(wks)
end)
function recursiveSolutionItemsNestedProjectLines(wks, parent, tbl)
    local parent_uuid
    if parent == "Solution Items" then
        parent_uuid = os.uuid("Solution Items:"..wks.name)
    else
        parent_uuid = os.uuid("Solution Items:"..wks.name..":"..parent)
    end

	for _, file in pairs(tbl) do
		if type(_) ~= "number" then
			local name = _
			local new_tbl = file
			project_uuid = os.uuid("Solution Items:"..wks.name..":"..name)
			premake.w("{%s} = {%s}", project_uuid, parent_uuid)
			--print("child:", name, "parent:", parent)
			recursiveSolutionItemsNestedProjectLines(wks, name, new_tbl)
		end
	end
end
premake.override(premake.vstudio.sln2005, "nestedProjects", function(base, wks)
	premake.push("GlobalSection(NestedProjects) = preSolution")
	-- base copy-paste START
	local tr = premake.workspace.grouptree(wks)
	if premake.tree.hasbranches(tr) then
		premake.tree.traverse(tr, {
			onnode = function(n)
				if n.parent.uuid then
					premake.w("{%s} = {%s}", (n.project or n).uuid, n.parent.uuid)
				end
			end
		})
	end
	-- base copy-paste END
	-- our START
	parent = "Solution Items"
	recursiveSolutionItemsNestedProjectLines(wks, parent, wks.solutionitems)
	-- our END
	premake.pop("EndGlobalSection")
end)