Meet Swift Package plugins

6:59 - General structure of a package plugin with conditional support for Xcode projects when running in Xcode

import PackagePlugin

@main
struct MyPlugin: ... {

    // Entry points specific to plugin capability. These entry points are invoked
    // when the plugin is applied to a package.

}

#if canImport(XcodeProjectPlugin)
import XcodeProjectPlugin

extension MyPlugin: ... {

    // Entry points specific to plugin capability. These entry points are invoked
    // when the plugin is applied to an Xcdeo project.

}
#endif

8:33 - Structure of a command plugin with conditional support for Xcode projects when running in Xcode

import PackagePlugin

@main
struct MyPlugin: CommandPlugin {

    /// This entry point is called when operating on a Swift package.
    func performCommand(context: PluginContext, arguments: [String]) throws {
        debugPrint(context)
    }
}

#if canImport(XcodeProjectPlugin)
import XcodeProjectPlugin

extension MyPlugin: XcodeCommandPlugin {

    /// This entry point is called when operating on an Xcode project.
    func performCommand(context: XcodePluginContext, arguments: [String]) throws {
        debugPrint(context)
    }
}
#endif

11:13 - Structure of a build tool plugin with conditional support for Xcode projects when running in Xcode

import PackagePlugin

@main
struct MyPlugin: BuildToolPlugin {

    /// This entry point is called when operating on a Swift package.
    func createBuildCommands(context: PluginContext, target: Target) throws -> [Command]
        debugPrint(context)
        return []
    }
}

#if canImport(XcodeProjectPlugin)
import XcodeProjectPlugin

extension MyPlugin: XcodeBuildToolPlugin {

    /// This entry point is called when operating on an Xcode project.
    func createBuildCommands(context: XcodePluginContext, target: XcodeTarget) throws -> [Command]
        debugPrint(context)
        return []
    }
}
#endif