Create install CLI command plugin

Package.swift

@@ -102,5 +102,17 @@ let package = Package(
       exclude: [
         "Info.plist",
       ]),
+    .plugin(
+      name: "InstallCLI",
+      capability: .command(
+        intent: .custom(
+          verb: "apollo-cli-install",
+          description: "Installs the Apollo iOS Command line interface."),
+        permissions: [
+          .writeToPackageDirectory(reason: "Creates a symbolic link to the CLI executable in your project directory.")
+        ]),
+      dependencies: [
+        "apollo-ios-cli"
+      ]),
   ]
 )

Plugins/InstallCLI/InstallCLIPluginCommand.swift

@@ -0,0 +1,37 @@
+import Foundation
+import PackagePlugin
+
+@main
+struct InstallCLIPluginCommand: CommandPlugin {
+
+  func performCommand(context: PackagePlugin.PluginContext, arguments: [String]) async throws {
+    let pathToCLI = try context.tool(named: "apollo-ios-cli").path
+    try createSymbolicLink(from: pathToCLI, to: context.package.directory)
+  }
+
+  func createSymbolicLink(from: PackagePlugin.Path, to: PackagePlugin.Path) throws {
+    let task = Process()
+    task.standardInput = nil
+    task.environment = ProcessInfo.processInfo.environment
+    task.arguments = ["-c", "ln -s \(from.string) \(to.string)"]
+    task.executableURL = URL(fileURLWithPath: "/bin/zsh")
+    try task.run()
+    task.waitUntilExit()
+  }
+
+}
+
+#if canImport(XcodeProjectPlugin)
+import XcodeProjectPlugin
+
+extension InstallCLIPluginCommand: XcodeCommandPlugin {
+
+  /// 👇 This entry point is called when operating on an Xcode project.
+  func performCommand(context: XcodePluginContext, arguments: [String]) throws {
+    print("Installing Apollo CLI Plugin to Xcode project \(context.xcodeProject.displayName)")
+    let pathToCLI = try context.tool(named: "apollo-ios-cli").path
+    try createSymbolicLink(from: pathToCLI, to: context.xcodeProject.directory)
+  }
+
+}
+#endif