Hello! I recently set up keybindings for my MacBook that were useful to me as a vim user. I'm going to share how I set up the following keybindings:

• caps lock as both esc and control
• control + H,J,K,L as arrow key alternatives
• Shortcuts to certain applications

All the Karabiner configurations are on my GitHub repository.

I usually just bind the caps lock key to the esc key. But this time, in my attempt to pursue the best programming experience I decided to bind the caps lock key to both the esc key and the control key. control key when combined with another key, and esc when the key is released without pressing any other keys. I am hoping that this will make both the esc key and control key easier to press. I took note of what I did in case I need to do it again on another computer.

Install Karabiner

Karabiner lets you customize how your keyboard behaves. I downloaded the installer at the Karabiner website and installed it by following the instructions. Just note that you need admin permission to install Karabiner.

Binding the caps lock key to the control key

This is pretty straightforward.

1. Open Karabiner-Elements app
2. Go to the Simple modifications tab
3. Add item
4. Set From key to caps_lock and To key to left_control

Now holding the caps lock key should behave like the control key. I'll add a screenshot just in case.

Binding the caps lock to the esc key

I wanted the caps lock key to behave like the esc key when it is pressed and released without pressing any other keys. This was a little more complicated.

1. Open the Karabiner configuration file at ~/.config/karabiner/karabiner.json
2. Add the JSON object below to the JSON key at

   // location to add code
   profiles[<your profile>].complex_modifications.rules
   

// code to add
{
    "description": "Bind CONTROL to ESCAPE",
    "manipulators": [
        {
            "from": {
                "key_code": "left_control",
                "modifiers": {}
            },
            "to": [
                {
                    "key_code": "left_control"
                }
            ],
            "to_if_alone": [
                {
                    "key_code": "escape"
                }
            ],
            "type": "basic"
        }
    ]
}

After you save the JSON file, Karabiner automatically reads the file. You should see a new rule under Complex modifications. You can understand what this JSON is doing by reading up on the Karabiner documentation.

Binding control + H,J,K,L as arrow key alternatives

I find the arrow keys sometimes too far, especially whenever I need to select an item when searching. Once this is set up, you can use this keybinding anywhere! I'll just paste the configuration JSON for this. Similar to the previous section, you just need to add the JSON to the profiles[<your profile>].complex_modifications.rules

{
    "description": "Arrow keys with CONTROL + H,J,K,L",
    "manipulators": [
        {
            "from": {
                "key_code": "h",
                "modifiers": {
                    "mandatory": ["control"]
                }
            },
            "to": [
                {
                    "key_code": "left_arrow"
                }
            ],
            "type": "basic"
        },
        {
            "from": {
                "key_code": "j",
                "modifiers": {
                    "mandatory": ["control"]
                }
            },
            "to": [
                {
                    "key_code": "down_arrow"
                }
            ],
            "type": "basic"
        },
        {
            "from": {
                "key_code": "k",
                "modifiers": {
                    "mandatory": ["control"]
                }
            },
            "to": [
                {
                    "key_code": "up_arrow"
                }
            ],
            "type": "basic"
        },
        {
            "from": {
                "key_code": "l",
                "modifiers": {
                    "mandatory": ["control"]
                }
            },
            "to": [
                {
                    "key_code": "right_arrow"
                }
            ],
            "type": "basic"
        }
    ]
}

Shortcuts to certain applications

I always find myself pressing command + tab a whole bunch to toggle through all the opened apps just to get to the browser. Having these shortcuts allow me to focus on the browser directly.

{
    "description": "Focus on browser",
    "manipulators": [
        {
            "type": "basic",
            "from": {
                "key_code": "b",
                "modifiers": 
                {
                    "mandatory": ["control", "command"]
                }
            },
            "to": [
                {
                    "shell_command": "osascript -e 'tell application \"Brave Browser\" to activate'"
                }
            ]
        }
    ]
}

This is calling an AppleScript code to focus on the specified application.

Thanks

Thanks for reading till the end! I hope you find this helpful!

Let me know your thoughts!