Arrow pad with caps_lock as toggle key

rule.json

{
  "title": "Arrow Key Pad",
  "rules": [
    {
      "description": "Arrow Keypad Mode [Capslock as trigger key]",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "caps_lock"
          },
          "to": [
            {
              "set_variable": {
                "name": "arrow_key_mode",
                "value": 1
              }
            }
          ],
          "conditions": [
            {
              "type": "variable_if",
              "name": "arrow_key_mode",
              "value": 0
            }
          ]
        },
        {
          "type": "basic",
          "from": {
            "key_code": "caps_lock"
          },
          "to": [
            {
              "set_variable": {
                "name": "arrow_key_mode",
                "value": 0
              }
            }
          ],
          "conditions": [
            {
              "type": "variable_if",
              "name": "arrow_key_mode",
              "value": 1
            }
          ]
        },
        {
          "type": "basic",
          "from": {
            "key_code": "j",
            "modifiers": {
              "optional": [
                "any"
              ]
            }
          },
          "to": [
            {
              "key_code": "left_arrow"
            }
          ],
          "conditions": [
            {
              "type": "variable_if",
              "name": "arrow_key_mode",
              "value": 1
            }
          ]
        },
        {
          "type": "basic",
          "from": {
            "key_code": "k",
            "modifiers": {
              "optional": [
                "any"
              ]
            }
          },
          "to": [
            {
              "key_code": "down_arrow"
            }
          ],
          "conditions": [
            {
              "type": "variable_if",
              "name": "arrow_key_mode",
              "value": 1
            }
          ]
        },
        {
          "type": "basic",
          "from": {
            "key_code": "l",
            "modifiers": {
              "optional": [
                "any"
              ]
            }
          },
          "to": [
            {
              "key_code": "right_arrow"
            }
          ],
          "conditions": [
            {
              "type": "variable_if",
              "name": "arrow_key_mode",
              "value": 1
            }
          ]
        },
        {
          "type": "basic",
          "from": {
            "key_code": "i",
            "modifiers": {
              "optional": [
                "any"
              ]
            }
          },
          "to": [
            {
              "key_code": "up_arrow"
            }
          ],
          "conditions": [
            {
              "type": "variable_if",
              "name": "arrow_key_mode",
              "value": 1
            }
          ]
        }
      ]
    }
  ]
}

Thanks for sharing this. I'm going to see if I can have a global VIM mode within macOS.