toggle dark mode: 🔋 → 🌚 / 🔌 → ☀️

README.md

Every 60s: toggle dark mode if on battery (save previous value). If back on power, revert to previous value.

NB: You'll get a notification when changed.

INSTALL

• ~/toggle_dark_mode.sh (don't forget to chmod u+x it)
• ~/Library/LaunchAgents/com.user.toggle_dark_mode.plist

com.user.toggle_dark_mode.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.user.toggle_dark_mode</string>
  <key>ProgramArguments</key>
  <array>
    <string>/Users/abernier/toggle_dark_mode.sh</string>
  </array>
  <key>StartInterval</key>
  <integer>60</integer>
</dict>
</plist>

toggle_dark_mode.sh

#!/bin/bash

#
# Toggle dark-mode when on battery. It executes every 60s (see: ~/Library/LaunchAgents/com.user.toggle_dark_mode.plist)
#
# see: https://chat.openai.com/share/dd8837b6-de79-4f8b-8e69-ef5eeaa33732
#

#!/bin/bash


# Check if running on battery
power_source=$(pmset -g ps | grep 'Now drawing from' | awk '{print $4}' | tr -d "'")

# File to store the original mode (using mktemp)
original_mode_file="/tmp/original_mode"

# Check current appearance mode: Dark, Light, or Auto
is_dark=$(defaults read -g AppleInterfaceStyle 2>/dev/null)
auto_mode=$(defaults read -g AppleInterfaceStyleSwitchesAutomatically 2>/dev/null)

# Function to display macOS notifications
notify() {
    osascript -e "display notification \"$1\" with title \"$(basename $0)\""
}

# Switch modes based on power source
if [ "$power_source" = "Battery" ]; then
  echo "🔋"

  # Save the original mode if not on Dark
  if [ -n "$is_dark" ]; then
    echo "Dark" > "$original_mode_file"
  elif [ -n "$auto_mode" ]; then
    echo "Auto" > "$original_mode_file"
  else
    echo "Light" > "$original_mode_file"
  fi

  # Enable Dark mode
  osascript -e 'tell app "System Events" to tell appearance preferences to set dark mode to true'
  notify "Dark mode enabled to preserve 🔋 (previous: $(cat $original_mode_file))"
else
  echo "🔌"

  # Revert to the original mode if it was saved
  if [ -f "$original_mode_file" ]; then
    original_mode=$(cat "$original_mode_file")
    case "$original_mode" in
      "Light")
        osascript -e 'tell app "System Events" to tell appearance preferences to set dark mode to false'
        notify "Light mode reverted since you are back on 🔌"
        ;;
      "Dark")
        # Already in Dark Mode, no action needed
        ;;
      "Auto")
        defaults write -g AppleInterfaceStyleSwitchesAutomatically -bool true
        notify "Auto mode reverted since you are back on 🔌"
        ;;
    esac
    
    # Delete the original_mode_file
    rm "$original_mode_file"
  fi
fi

https://twitter.com/abernier_/status/1698645537958883422?s=20