wip

Plugins/GitVersionBuildPlugin/GitVersionBuildPlugin.swift

@@ -0,0 +1,51 @@
+import Foundation
+import PackagePlugin
+
+@main
+struct GitVersionBuildPlugin: BuildToolPlugin {
+
+  func createBuildCommands(
+    context: PackagePlugin.PluginContext,
+    target: PackagePlugin.Target
+  ) async throws -> [PackagePlugin.Command] {
+
+    guard let target = target as? SourceModuleTarget else { return [] }
+    let buildTool = try context.tool(named: "git-version-builder")
+
+    let outputDir = context.pluginWorkDirectory
+      .appending(subpath: target.name)
+
+    try FileManager.default
+      .createDirectory(atPath: outputDir.string, withIntermediateDirectories: true)
+
+    let inputFiles = target.sourceFiles
+      .filter({ $0.type == .source && $0.path.stem == "Version" })
+      .map(\.path)
+
+    guard inputFiles.count == 1 else { return [] }
+
+    let outputFile = outputDir.appending(subpath: "Version.generated.swift")
+
+    print("Input swift files: \(inputFiles)")
+
+//    let originalContents = try String(contentsOfFile: inputFiles.first!.string)
+//    let updatedContents = originalContents.replacingOccurrences(of: "nil", with: "\"0.1.123\"")
+//
+//    print("Updated contents")
+//    print(updatedContents)
+
+    // this fails.
+    return [
+      .buildCommand(
+        displayName: "Git Version Build Plugin",
+        executable: buildTool.path,
+        arguments: [
+          inputFiles.first!,
+          outputFile.string
+        ]
+//        ,
+//        outputFiles: [outputFile]
+      )
+    ]
+  }
+}