karabiner setup

{
  "global": {
    "check_for_updates_on_startup": true,
    "show_in_menu_bar": false,
    "show_profile_name_in_menu_bar": false
  },
  "profiles": [
    {
      "complex_modifications": {
        "parameters": {
          "basic.simultaneous_threshold_milliseconds": 10,
          "basic.to_delayed_action_delay_milliseconds": 100,
          "basic.to_if_alone_timeout_milliseconds": 200,
          "basic.to_if_held_down_threshold_milliseconds": 100
        },
        "rules": [
          {
            "description": "Caps Lock to Fn",
            "manipulators": [
              {
                "type": "basic",
                "from": {
                  "key_code": "caps_lock",
                  "modifiers": {
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "fn"
                  }
                ]
              }
            ]
          },
          {
            "description": "Fn + H/J/K/L to Arrow Keys",
            "manipulators": [
              {
                "type": "basic",
                "from": {
                  "key_code": "h",
                  "modifiers": {
                    "mandatory": [
                      "fn"
                    ],
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "left_arrow"
                  }
                ]
              },
              {
                "type": "basic",
                "from": {
                  "key_code": "j",
                  "modifiers": {
                    "mandatory": [
                      "fn"
                    ],
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "down_arrow"
                  }
                ]
              },
              {
                "type": "basic",
                "from": {
                  "key_code": "k",
                  "modifiers": {
                    "mandatory": [
                      "fn"
                    ],
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "up_arrow"
                  }
                ]
              },
              {
                "type": "basic",
                "from": {
                  "key_code": "l",
                  "modifiers": {
                    "mandatory": [
                      "fn"
                    ],
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "right_arrow"
                  }
                ]
              }
            ]
          },
          {
            "description": "Disable arrows",
            "manipulators": [
              {
                "type": "basic",
                "from": {
                  "key_code": "left_arrow",
                  "modifiers": {
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "vk_none"
                  }
                ]
              },
              {
                "type": "basic",
                "from": {
                  "key_code": "right_arrow",
                  "modifiers": {
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "vk_none"
                  }
                ]
              },
              {
                "type": "basic",
                "from": {
                  "key_code": "up_arrow",
                  "modifiers": {
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "vk_none"
                  }
                ]
              },
              {
                "type": "basic",
                "from": {
                  "key_code": "down_arrow",
                  "modifiers": {
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "vk_none"
                  }
                ]
              }
            ]
          },
          {
            "description": "Change input source to eng",
            "manipulators": [
              {
                "from": {
                  "key_code": "left_command",
                  "modifiers": {
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "left_command"
                  }
                ],
                "to_if_alone": [
                  {
                    "select_input_source": {
                      "input_source_id": "^org\\.sil\\.ukelele\\.keyboardlayout\\.t\\.english\\-\\ ilya\\ birman\\ typography$"
                    }
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "Change input source to rus",
            "manipulators": [
              {
                "from": {
                  "key_code": "right_command",
                  "modifiers": {
                    "optional": [
                      "any"
                    ]
                  }
                },
                "to": [
                  {
                    "key_code": "right_command"
                  }
                ],
                "to_if_alone": [
                  {
                    "select_input_source": {
                      "input_source_id": "^org\\.sil\\.ukelele\\.keyboardlayout\\.t\\.russian\\-\\ ilya\\ birman\\ typography$"
                    }
                  }
                ],
                "type": "basic"
              }
            ]
          }
        ]
      },
      "devices": [],
      "fn_function_keys": [
        {
          "from": {
            "key_code": "f1"
          },
          "to": {
            "key_code": "display_brightness_decrement"
          }
        },
        {
          "from": {
            "key_code": "f2"
          },
          "to": {
            "key_code": "display_brightness_increment"
          }
        },
        {
          "from": {
            "key_code": "f3"
          },
          "to": {
            "key_code": "mission_control"
          }
        },
        {
          "from": {
            "key_code": "f4"
          },
          "to": {
            "key_code": "launchpad"
          }
        },
        {
          "from": {
            "key_code": "f5"
          },
          "to": {
            "key_code": "illumination_decrement"
          }
        },
        {
          "from": {
            "key_code": "f6"
          },
          "to": {
            "key_code": "illumination_increment"
          }
        },
        {
          "from": {
            "key_code": "f7"
          },
          "to": {
            "key_code": "rewind"
          }
        },
        {
          "from": {
            "key_code": "f8"
          },
          "to": {
            "key_code": "play_or_pause"
          }
        },
        {
          "from": {
            "key_code": "f9"
          },
          "to": {
            "key_code": "fastforward"
          }
        },
        {
          "from": {
            "key_code": "f10"
          },
          "to": {
            "key_code": "mute"
          }
        },
        {
          "from": {
            "key_code": "f11"
          },
          "to": {
            "key_code": "volume_decrement"
          }
        },
        {
          "from": {
            "key_code": "f12"
          },
          "to": {
            "key_code": "volume_increment"
          }
        }
      ],
      "name": "Default profile",
      "selected": true,
      "simple_modifications": [],
      "virtual_hid_keyboard": {
        "caps_lock_delay_milliseconds": 0,
        "country_code": 0,
        "keyboard_type": "ansi"
      }
    }
  ]
}