Preface

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Problem Description

These past few days I wanted to align my code and found that the XAlign plugin I often use had stopped working. Looking at the settings, I saw that Xcode Source Editor was missing from the extensions.

After searching online, I found a reliable solution, so I’m recording it here.

Enter the following in the terminal and it will show up:

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$ PATH=/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support:"$PATH"
$ lsregister -f /Applications/Xcode.app

The cause

When multiple copies of Xcode are on the same machine, extensions may stop working entirely. In this case, Apple Developer Relations suggests re-registering your primary copy of Xcode with Launch Services (the easiest way is to temporarily add lsregister’s location to PATH):

Reference https://nshipster.com/xcode-source-extensions/

Summary

Recording a commonly encountered problem.