dark-mode-notify

This small Swift program will run a command whenever the dark mode status changes on macOS. You can use it to change your vim color config automatically for example.

Usage

You can run it directly by doing ./dark-mode-notify.swift <program>.

Alternatively you can compile it by doing swiftc dark-mode-notify.swift -o /usr/local/bin/dark-mode-notify.

The program will be run immediately when the command starts, and every time the OS goes from dark mode to light mode or back. The environment variable DARKMODE will be set to either 1 or 0.

Background agent

To keep this program running in the background, compile the binary to somewhere and create the following file at ~/Library/LaunchAgents/ke.bou.dark-mode-notify.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>ke.bou.dark-mode-notify</string>
    <key>KeepAlive</key>
    <true/>
    <key>ProgramArguments</key>
    <array>
       <string>/usr/local/bin/dark-mode-notify</string>
       <string>--- Path to your script ---</string>
    </array>
</dict>
</plist>

Then launchctl load -w ~/Library/LaunchAgents/ke.bou.dark-mode-notify.plist will keep it running on boot.

Credit

This script is a lightly modified version of https://github.com/mnewt/dotemacs/blob/master/bin/dark-mode-notifier.swift