Single weapon switch/toggle bind...

alias magtotal [result (+ (magcontent $arg1) (magreserve $arg1))]

alias intelli_switch [
  if (= (currentprimary) (curweapon)) [
    if (magtotal 8) [
      grenades
    ] [
      if (|| (magtotal 1) (magtotal 9)) [
        secondary
      ] [
        melee
      ]
    ]
  ] [
    if (magtotal (currentprimary)) [
      primary
    ] [
      if (magtotal 8) [
        grenades
      ] [
        if (|| (magtotal 1) (magtotal 9)) [
          secondary
        ] [
          melee
        ]
      ]
    ]
  ]
]