Karabiner-Elements Config: shift for us shift-shift for rime

karabiner-shift-ime-config.json

{
    "description": "Use left Shift for English/Chinese input switching",
    "manipulators": [
        {
            "conditions": [
                {
                    "name": "left_shift_pressed",
                    "type": "variable_if",
                    "value": 1
                }
            ],
            "from": {
                "key_code": "left_shift",
                "modifiers": { "optional": ["any"] }
            },
            "to": [{ "select_input_source": { "input_mode_id": "im.rime.inputmethod.Squirrel.Hans" } }],
            "type": "basic"
        },
        {
            "from": {
                "key_code": "left_shift",
                "modifiers": { "optional": ["any"] }
            },
            "parameters": {
                "basic.to_delayed_action_delay_milliseconds": 200,
                "basic.to_if_alone_timeout_milliseconds": 200
            },
            "to": [
                {
                    "set_variable": {
                        "name": "left_shift_pressed",
                        "value": 1
                    }
                },
                { "key_code": "left_shift" }
            ],
            "to_delayed_action": {
                "to_if_canceled": [
                    {
                        "set_variable": {
                            "name": "left_shift_pressed",
                            "value": 0
                        }
                    }
                ],
                "to_if_invoked": [
                    {
                        "set_variable": {
                            "name": "left_shift_pressed",
                            "value": 0
                        }
                    }
                ]
            },
            "to_if_alone": [{ "select_input_source": { "language": "en" } }],
            "type": "basic"
        }
    ]
}