nix/config/karabiner/karabiner.json

{
  "profiles": [
    {
      "complex_modifications": {
        "rules": [
          {
            "description": "Caps Lock to Control (held) / Escape (tapped)",
            "manipulators": [
              {
                "from": {
                  "key_code": "caps_lock",
                  "modifiers": {
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "left_control"
                  }
                ],
                "to_if_alone": [
                  {
                    "key_code": "escape"
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "Caps Lock + H = Left Arrow",
            "manipulators": [
              {
                "from": {
                  "key_code": "h",
                  "modifiers": {
                    "mandatory": [
                      "option"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "left_arrow"
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "Caps Lock + J = Scroll Down",
            "manipulators": [
              {
                "from": {
                  "key_code": "j",
                  "modifiers": {
                    "mandatory": [
                      "option"
                    ]
                  }
                },
                "to": [
                  {
                    "mouse_key": {
                      "vertical_wheel": 80
                    }
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "Caps Lock + K = Scroll Up",
            "manipulators": [
              {
                "from": {
                  "key_code": "k",
                  "modifiers": {
                    "mandatory": [
                      "option"
                    ]
                  }
                },
                "to": [
                  {
                    "mouse_key": {
                      "vertical_wheel": -80
                    }
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "Caps Lock + L = Right Arrow",
            "manipulators": [
              {
                "from": {
                  "key_code": "l",
                  "modifiers": {
                    "mandatory": [
                      "option"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "right_arrow"
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "Control + L = Right Arrow",
            "manipulators": [
              {
                "from": {
                  "key_code": "l",
                  "modifiers": {
                    "mandatory": [
                      "left_control"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "right_arrow"
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "Control + H = Left Arrow",
            "manipulators": [
              {
                "from": {
                  "key_code": "h",
                  "modifiers": {
                    "mandatory": [
                      "left_control"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "left_arrow"
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "Right Command = Ctrl+B (tmux prefix)",
            "manipulators": [
              {
                "from": {
                  "key_code": "right_command",
                  "modifiers": {
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "b",
                    "modifiers": [
                      "left_control"
                    ]
                  }
                ],
                "type": "basic"
              }
            ]
          }
        ]
      },
      "devices": [
        {
          "identifiers": {
            "is_keyboard": true,
            "product_id": 911,
            "vendor_id": 1008
          },
          "simple_modifications": [
            {
              "from": { "key_code": "left_option" },
              "to": [{ "key_code": "left_command" }]
            },
            {
              "from": { "key_code": "left_command" },
              "to": [{ "key_code": "left_option" }]
            },
            {
              "from": { "key_code": "right_option" },
              "to": [{ "key_code": "right_command" }]
            },
            {
              "from": { "key_code": "right_command" },
              "to": [{ "key_code": "right_option" }]
            },
            {
              "from": { "key_code": "escape" },
              "to": [{ "key_code": "grave_accent_and_tilde" }]
            }
          ]
        }
      ],
      "name": "Default profile",
      "selected": true,
      "virtual_hid_keyboard": {
        "country_code": 0,
        "keyboard_type_v2": "ansi"
      }
    }
  ]
}