Assign CapsLock to RightControl

I'm using Handy.app (cjpais/Handy) for text-to-speech and hold-to-speak functionality. Which button to use? Right Option rarely used, but I do use it as Hyper key in Emacs, in particular {H-RET} calls visit-source (visit-source.el).

Right Control also rarely used and does exists on my Keyboardio Model 100. But, it turned out macOS remaps CapsLock to Right Control from the SystemSettings.app.

260804--keyboard-remapping__macos.png

I need some remapping then, for internal keyboard only:

  • CapsLock to Left Control
  • Left Control to Right Control

To achieve that, store the plist to ~/Library/LaunchAgents/com.local.keyboard-remap.plist file.

To rebind live without reboot, run hidutil commands manually. In SystemSettings.app set default CapsLock binding (CapsLock to CapsLock). 

<?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.local.keyboard-remap</string>
  <key>ProgramArguments</key>
  <array>
    <string>/bin/sh</string>
    <string>-c</string>
    <string>
      /usr/bin/hidutil property --set '{"UserKeyMapping":[{"HIDKeyboardModifierMappingSrc":0x700000039,"HIDKeyboardModifierMappingDst":0x7000000E0}]}';
      /usr/bin/hidutil property --matching '{"VendorID":0x0,"ProductID":0x0}' --set '{"UserKeyMapping":[{"HIDKeyboardModifierMappingSrc":0x700000039,"HIDKeyboardModifierMappingDst":0x7000000E0},{"HIDKeyboardModifierMappingSrc":0x7000000E0,"HIDKeyboardModifierMappingDst":0x7000000E4}]}'
    </string>
  </array>
  <key>RunAtLoad</key>
  <true/>
</dict>
</plist>