Unfortunately there is no Swift version of this template, so we will need to rewrite it in Swift manually. XPC Service template already contains everything that we need - it has a service protocol and its implementation that contains a simple function to uppercase input string, and comments on how to call the service from the app. I will not go into details of XPC service implementation, you can find everything you need to know in docs.Ĭreate a Cocoa Application and XPC Service target using Xcode templates. First let’s try to create a simple XPC service that our app can communicate with. So let’s go through this setup step by step. The main actors will be an extension and it’s accompanying XPC service. The app itself can be as dumb as possible, it does not need to do anything, though it can be used as a settings interface for extension. Extension in its turn will serve as a container for XPC service. XPC services everywhere! Instead of using SourceKitten directly we will access it through XPC service that will be not sandboxed and so can use SourceKitten.Īs our source editor extension is just an app extension it requires some MacOS app that will contain it. So how can we run SourceKitten from non-sandboxed environment while being in a sandboxed environment of extension? The answer is - XPC service. In non-sandboxed app we can use SourceKitten without any problems.īut if we try to turn off sandboxing for source editor extension it will simply not show up in Editor menu. Luckily on MacOS we can run non-sandboxed apps unless we want to distribute them via App Store. Xcode source editor extension though should be sandboxed. And as that error message says this command can not be used within an App Sandbox. It basically invokes xcrun command with different flags and parameters. Under the hood SourceKitten uses XPC service to communicate with SourceKit process, the same what Xcode does. We run our extension and… we see in the console: xcrun: error: cannot be used within an App Sandbox. We go and create an Xcode source editor extension, link it with SourceKittenFramework and its dependencies, write some boilerplate implementation of extension command that uses one of SourceKitten APIs, like Structure. Is it even possible to use SourceKitten in Xcode extension? Let’s try. Usually though it’s used as a framework as part of other tools, usually command line tools that are supposed to be run from a build step of your project, not in source editor extension. Luckily thanks to OSS community we have such projects as SourceKitten that fills this gap and gives us some foundation to build cool stuff on top of it. There are also no first-party tools for code analysis, so we have to parse the code manually. We can only manipulate the content of currently selected file, have no (official) access to any project metadata and other sources. At this moment unfortunately we are provided with a very limited tools. With Xcode 8 Apple finally provided developers with first party API to develop plugin-like Xcode extensions, at the same time closing all the doors for in-process plugins.
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