Rewrite readme

xmake/actions/listdeps.lua

@@ -0,0 +1,49 @@
+task("list-deps")
+
+set_menu({
+	-- Settings menu usage
+	usage = "xmake list-deps [target]",
+	description = "List dependencies used by the engine or a specific target",
+	options =
+	{
+		{'t', "target", "v", nil, "Target name" }
+	}
+})
+
+on_run(function ()
+	import("core.base.option")
+	import("core.project.project")
+	import("private.action.require.impl.package")
+
+	local requires, requires_extra = project.requires_str()
+	if not requires or #requires == 0 then
+		return
+	end
+
+	local usedpackages
+
+	local targetname = option.get("target")
+	if targetname then
+		local target = project.target(targetname)
+		usedpackages = target:pkgs()
+	else
+		usedpackages = project.required_packages()
+	end
+
+	local projectdeps = {}
+	for _, instance in ipairs(package.load_packages(requires, {requires_extra = requires_extra})) do
+		if usedpackages[instance:name()] then
+			table.insert(projectdeps, {
+				name = instance:name(),
+				desc = instance:description(),
+				homepage = instance:get("homepage")
+			})
+		end
+	end
+
+	table.sort(projectdeps, function (a, b) return a.name < b.name end)
+
+	for _, dep in pairs(projectdeps) do
+		print(string.format("- [%s](%s): %s", dep.name, dep.homepage, dep.desc))
+	end
+end)