From 063341b5639d9ecf4e75656eac5f2e8484fcddb2 Mon Sep 17 00:00:00 2001
From: Hamish Knight <hamish_knight@apple.com>
Date: Fri, 4 Apr 2025 13:21:22 +0100
Subject: [PATCH] [xcodegen] Print the time taken to generate

---
 .../swift-xcodegen/SwiftXcodegen.swift        | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/utils/swift-xcodegen/Sources/swift-xcodegen/SwiftXcodegen.swift b/utils/swift-xcodegen/Sources/swift-xcodegen/SwiftXcodegen.swift
index 854dc524c721..37d1bb5d0cec 100644
--- a/utils/swift-xcodegen/Sources/swift-xcodegen/SwiftXcodegen.swift
+++ b/utils/swift-xcodegen/Sources/swift-xcodegen/SwiftXcodegen.swift
@@ -11,7 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 import ArgumentParser
-import Darwin
+import Foundation
 import SwiftXcodeGen
 
 @main
@@ -399,14 +399,27 @@ struct SwiftXcodegen: AsyncParsableCommand, Sendable {
         try lldbLLVMWorkspace.write("LLDB+LLVM", into: outputDir)
       }
     }
-    showCaveatsIfNeeded()
+  }
+
+  func printingTimeTaken<T>(_ fn: () async throws -> T) async rethrows -> T {
+    let start = Date()
+    let result = try await fn()
+
+    // Note we don't print the time taken when we fail.
+    let delta = Date().timeIntervalSince(start)
+    log.info("Successfully generated in \(Int((delta * 1000).rounded()))ms")
+
+    return result
   }
 
   func run() async {
     // Set the log level
     log.logLevel = .init(self.logLevel ?? (self.quiet ? .warning : .info))
     do {
-      try await generate()
+      try await printingTimeTaken {
+        try await generate()
+      }
+      showCaveatsIfNeeded()
     } catch {
       log.error("\(error)")
     }