docs: def pkg_tracking(self):
          """Tracking package dependencies
          """
          flag = []
          options = [
              "-t",
              "--tracking"
          ]
          additional_options = [
              "--check-deps",
              "--graph=",
              "--case-ins"
          ]
          for arg in self.args[2:]:
              if arg.startswith(additional_options[1]):
                  flag.append(arg)
                  self.args.remove(arg)
              if arg in additional_options:
                  flag.append(arg)
          # clean additional options from args
          for f in flag:
              if f in self.args:
                  self.args.remove(f)
          # print usage message if wrong additional option
          for arg in self.args:
              if arg.startswith("--"):
                  if arg not in additional_options:
                      usage("")
                      raise SystemExit()
          if (len(self.args) >= 3 and len(self.args) <= 3 and
                  self.args[0] in options and
                  self.args[1] in self.meta.repositories):
              TrackingDeps(self.args[2], self.args[1], flag).run()
          elif (len(self.args) >= 2 and
                  self.args[1] not in self.meta.repositories):
              usage(self.args[1])
          else:
              usage("")