Keep Lang Switcher always running on macOS (launchd + AppleScript)

com.user.LangSwitcher.plist.md

Keep Lang Switcher always running on macOS (launchd + AppleScript)

This setup ensures Lang Switcher is always running on macOS.
If the app crashes or is accidentally closed, it will automatically restart.
Unlike open -a, this method avoids stealing focus every time Lang Switcher launches.

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⚙️ Installation

1. Open Terminal and create a LaunchAgents folder (if it doesn’t exist):

   mkdir -p ~/Library/LaunchAgents

2. Create a new service file:

   nano ~/Library/LaunchAgents/com.user.LangSwitcher.plist

3. Paste the following content:

   <?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>com.user.LangSwitcher</string>
   
    <key>LimitLoadToSessionType</key>
    <string>Aqua</string>
   
    <key>ProgramArguments</key>
    <array>
      <string>/usr/bin/open</string>
      <string>-g</string>
      <string>-W</string>
      <string>-a</string>
      <string>Lang Switcher</string>
    </array>
   
    <key>RunAtLoad</key>
    <true/>
   
    <key>KeepAlive</key>
    <true/>
   
    <!-- optional: reduce “respawn spam” if something crashes fast -->
    <key>ThrottleInterval</key>
    <integer>1</integer>
   </dict>
   </plist>

4. Load the service:

   launchctl load ~/Library/LaunchAgents/com.user.LangSwitcher.plist

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🔄 Usage

• Now, Lang Switcher will always stay open.
• If you close it manually or it crashes, launchd will restart it automatically.
• To disable the service:

  launchctl unload ~/Library/LaunchAgents/com.user.LangSwitcher.plist