Remove use of NSString.replacingOccurrences(of:with:)

Prefer to use `String.replacing(_:with:)` instead of the `NSString`
operations for the strings.  This should avoid an unnecessary use of
Foundation API and a dispatch to the `NSString` API.

Bump the minimum platform version to 10.13 to deal with the API
availability in the standard library.

Author: compnerd

Sources/Basics/Concurrency/AsyncProcess.swift

@@ -1316,7 +1316,8 @@ extension AsyncProcessResult.Error: CustomStringConvertible {
                 let indentation = "    "
                 str.append(contentsOf: " output:\n")
                 str.append(contentsOf: indentation)
-                str.append(contentsOf: output.replacingOccurrences(of: "\n", with: "\n" + indentation))
+                str.append(contentsOf: output.split(whereSeparator: { $0.isNewline })
+                                             .joined(separator: "\n\(indentation)")
                 if !output.hasSuffix("\n") {
                     str.append(contentsOf: "\n")
                 }

Sources/Basics/FileSystem/AbsolutePath.swift

@@ -321,7 +321,7 @@ extension AbsolutePath {
 
 extension AbsolutePath {
     public var escapedPathString: String {
-        self.pathString.replacingOccurrences(of: "\\", with: "\\\\")
+        self.pathString.replacing("\\", with: "\\\\")
     }
 }
 

Sources/Basics/FileSystem/NativePathExtensions.swift

@@ -20,7 +20,7 @@ extension AbsolutePath {
         return URL(fileURLWithPath: self.pathString).withUnsafeFileSystemRepresentation {
             let repr = String(cString: $0!)
             if escaped {
-                return repr.replacingOccurrences(of: "\\", with: "\\\\")
+                return repr.replacing("\\", with: "\\\\")
             }
             return repr
         }

Sources/Basics/Netrc.swift

@@ -135,7 +135,7 @@ public struct NetrcParser {
             let matchedString = nsString.substring(with: $0.range)
             if !matchedString.starts(with: "\"") {
                 trimmedCommentsText = trimmedCommentsText
-                    .replacingOccurrences(of: matchedString, with: "")
+                    .replacing(matchedString, with: "")
             }
         }
         return trimmedCommentsText

Sources/Basics/Sandbox.swift

@@ -241,8 +241,8 @@ extension AbsolutePath {
     /// Private computed property that returns a version of the path as a string quoted for use as a subpath in a .sb sandbox profile.
     fileprivate var quotedAsSubpathForSandboxProfile: String {
         "\"" + self.pathString
-            .replacingOccurrences(of: "\\", with: "\\\\")
-            .replacingOccurrences(of: "\"", with: "\\\"")
+            .replacing("\\", with: "\\\\")
+            .replacing("\"", with: "\\\"")
             + "\""
     }
 }

Sources/Basics/Serialization/SerializedJSON.swift

@@ -31,7 +31,7 @@ extension SerializedJSON: ExpressibleByStringInterpolation {
         fileprivate var value: String = ""
 
         private func escape(_ string: String) -> String {
-            string.replacingOccurrences(of: #"\"#, with: #"\\"#)
+            string.replacing(#"\"#, with: #"\\"#)
         }
 
         public init(literalCapacity: Int, interpolationCount: Int) {

Sources/Commands/Utilities/DOTManifestSerializer.swift

@@ -38,8 +38,8 @@ struct DOTManifestSerializer {
 
     /// Quote the name and escape the quotes and backslashes
     func quoteName(_ name: String) -> String {
-        "\"" + name.replacingOccurrences(of: "\"", with: "\\\"")
-            .replacingOccurrences(of: "\\", with: "\\\\") + "\""
+        "\"" + name.replacing("\"", with: "\\\"")
+                   .replacing("\\", with: "\\\\") + "\""
     }
 
     mutating func writeDOT(to stream: OutputByteStream) {

Sources/PackageLoading/ManifestLoader.swift

@@ -785,7 +785,7 @@ public final class ManifestLoader: ManifestLoaderProtocol {
                 let vfsOverlayTempFilePath = tempDir.appending("vfs.yaml")
                 try VFSOverlay(roots: [
                     VFSOverlay.File(
-                        name: manifestPath._normalized.replacingOccurrences(of: #"\"#, with: #"\\"#),
+                        name: manifestPath._normalized.replacing(#"\"#, with: #"\\"#),
                         externalContents: manifestTempFilePath._nativePathString(escaped: true)
                     )
                 ]).write(to: vfsOverlayTempFilePath, fileSystem: localFileSystem)
@@ -1061,7 +1061,7 @@ public final class ManifestLoader: ManifestLoaderProtocol {
 
                         var environment = Environment.current
                         #if os(Windows)
-                        let windowsPathComponent = runtimePath.pathString.replacingOccurrences(of: "/", with: "\\")
+                        let windowsPathComponent = runtimePath.pathString.replacing("/", with: "\\")
                         environment.prependPath(key: .path, value: windowsPathComponent)
                         #endif
 

Sources/PackageLoading/ModuleMapGenerator.swift

@@ -19,7 +19,7 @@ public let moduleMapFilename = "module.modulemap"
 
 extension AbsolutePath {
   fileprivate var moduleEscapedPathString: String {
-    return self.pathString.replacingOccurrences(of: "\\", with: "\\\\")
+    return self.pathString.replacing("\\", with: "\\\\")
   }
 }
 

Sources/PackageModel/ManifestSourceGeneration.swift

@@ -695,8 +695,8 @@ extension TargetBuildSettingDescription.Kind {
 extension String {
     fileprivate var quotedForPackageManifest: String {
         return "\"" + self
-            .replacingOccurrences(of: "\\", with: "\\\\")
-            .replacingOccurrences(of: "\"", with: "\\\"")
+            .replacing("\\", with: "\\\\")
+            .replacing("\"", with: "\\\"")
             + "\""
     }
 }