Add carton package cmd (#96)

* Ignore generate-xcodeproj artifact

* Add carton package command which proxies to swift-package in the selected toolchain

.gitignore

@@ -40,7 +40,7 @@ playground.xcworkspace
 # Packages/
 # Package.pins
 # Package.resolved
-# *.xcodeproj
+*.xcodeproj
 #
 # Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata
 # hence it is not needed unless you have added a package configuration file to your project

Sources/SwiftToolchain/Toolchain.swift

@@ -277,4 +277,10 @@ public final class Toolchain {
     try ProcessRunner(initArgs, terminal)
       .waitUntilFinished()
   }
+
+  public func runPackage(_ arguments: [String]) throws {
+    let args = [swiftPath.pathString, "package"] + arguments
+    try ProcessRunner(args, terminal)
+      .waitUntilFinished()
+  }
 }

Sources/carton/Carton.swift

@@ -19,6 +19,6 @@ struct Carton: ParsableCommand {
   static let configuration = CommandConfiguration(
     abstract: "📦 Watcher, bundler, and test runner for your SwiftWasm apps.",
     version: cartonVersion,
-    subcommands: [Init.self, Dev.self, SDK.self, Test.self]
+    subcommands: [Init.self, Dev.self, SDK.self, Test.self, Package.self]
   )
 }

Sources/carton/Commands/Package.swift

@@ -0,0 +1,34 @@
+// Copyright 2020 Carton contributors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import ArgumentParser
+import SwiftToolchain
+import TSCBasic
+
+/// Proxy swift-package command to locally pinned toolchain version.
+struct Package: ParsableCommand {
+  static let configuration = CommandConfiguration(abstract: """
+  Perform operations on Swift packages.
+  """)
+
+  @Argument(wrappedValue: [], parsing: .remaining)
+  var arguments: [String]
+
+  func run() throws {
+    guard let terminal = TerminalController(stream: stdoutStream)
+    else { fatalError("failed to create an instance of `TerminalController`") }
+    let toolchain = try Toolchain(localFileSystem, terminal)
+    try toolchain.runPackage(arguments)
+  }
+}