Fix a Swift 5.8 warning

If Foundation is not available, fallback to new
collection replace function.

Sources/Lighter/Expression/SQLBuilder.swift

@@ -1,8 +1,12 @@
 //
 //  Created by Helge Heß.
-//  Copyright © 2022 ZeeZide GmbH.
+//  Copyright © 2022-2023 ZeeZide GmbH.
 //
 
+#if canImport(Foundation)
+  import Foundation
+#endif
+
 /**
  * A helper struct to build SQL queries.
  */
@@ -42,9 +46,19 @@ public struct SQLBuilder<Base: SQLRecord> {
   /// Escape the `id` (e.g. a column or table name) and surround it by quotes.
   @inlinable
   public func escapeAndQuoteIdentifier(_ id: String) -> String {
-    id.contains("\"")
-      ? "\"\(id.replacingOccurrences(of: "\"", with: "\"\""))\""
-      : "\"\(id)\""
+    guard id.contains("\"") else { return "\"\(id)\"" }
+
+    #if canImport(Foundation)
+      return "\"\(id.replacingOccurrences(of: "\"", with: "\"\""))\""
+    #else
+      if #available(macOS 13.0, iOS 16.0, watchOS 9.0, tvOS 16.0, *) {
+        // Tie to Swift version on Linux?
+        return id.replacing("\"", with: "\"\"")
+      }
+      else {
+        fatalError("Can't escape identifier w/o Foundation.")
+      }
+    #endif
   }
 
 

Sources/Lighter/Lighter.docc/Linux.md

@@ -35,7 +35,7 @@ import Northwind    // @Lighter-swift/NorthwindSQLite.swift
 let db  = Northwind.module!
 let app = express()
 
-app.get("/api/products") { _, res, _ in
+app.get("/api/products") { _, res in
   res.send(try db.products.fetch())
 }
 
@@ -60,7 +60,7 @@ var package = Package(
     .package(url: "https://Lighter-swift/NorthwindSQLite.swift.git",
              from: "1.0.0"),
     .package(url: "https://github.com/Macro-swift/MacroExpress.git",
-             from: "0.8.8")
+             from: "1.0.2")
   ],
 
   targets: [