Add Msg2swift command plugin

.gitignore

@@ -4,3 +4,4 @@
 .swiftpm
 /Packages
 /*.xcodeproj
+Package.resolved

Package.swift

@@ -1,13 +1,16 @@
-// swift-tools-version:5.6
+// swift-tools-version:5.8
 
 import PackageDescription
 
 let package = Package(
     name: "CDRCodable",
+    platforms: [.macOS(.v13)],
     products: [
-        .library(
-            name: "CDRCodable",
-            targets: ["CDRCodable"]),
+        .library(name: "CDRCodable", targets: ["CDRCodable"]),
+        .plugin(name: "Msg2swiftCommand", targets: ["Msg2swiftCommand"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/DimaRU/Msg2swift.git", branch: "develop")
     ],
     targets: [
         .target(
@@ -16,5 +19,15 @@ let package = Package(
             name: "CDRCodableTests",
             dependencies: ["CDRCodable"]
         ),
+        .plugin(
+            name: "Msg2swiftCommand",
+            capability: .command(
+                intent: .custom(verb: "msg2swift", description: "Generate Swift model code from ROS message file."),
+                permissions: [.writeToPackageDirectory(reason: "Add generated Swift code")]
+            ),
+            dependencies: [
+                .product(name: "msg2swift", package: "Msg2swift"),
+            ]
+        ),
     ]
 )

Plugins/Msg2swiftCommand/plugin.swift

@@ -0,0 +1,37 @@
+import PackagePlugin
+import Foundation
+
+@main
+struct Msg2swiftCommandPlugin: CommandPlugin {
+    func performCommand(context: PluginContext, arguments: [String]) throws {
+        let msg2swiftTool = try context.tool(named: "msg2swift").path
+        var argExtractor = ArgumentExtractor(arguments)
+
+        let targetNames = argExtractor.extractOption(named: "target")
+        var runArguments = argExtractor.remainingArguments
+        if !(arguments.contains("-o") || arguments.contains("--output-directory")) {
+            let targets = targetNames.isEmpty
+            ? context.package.targets
+            : try context.package.targets(named: targetNames)
+
+            for target in targets {
+                guard let target = target as? SourceModuleTarget else { continue }
+                runArguments.append("--output-directory")
+                runArguments.append(target.directory.string)
+                break
+            }
+        }
+
+        let process = try Process.run(URL(fileURLWithPath: msg2swiftTool.string), arguments: runArguments)
+        process.waitUntilExit()
+
+        guard
+            process.terminationReason == .exit,
+            process.terminationStatus == 0
+        else {
+            let problem = "\(process.terminationReason):\(process.terminationStatus)"
+            Diagnostics.error("msg2swift invocation failed: \(problem)")
+            return
+        }
+    }
+}