Foreground process fix (#226)

Fixed bug where child process did not set parent process back to foreground

---------

Co-authored-by: John Bute <johnbute@Johns-MacBook-Pro.local>

Author: johnbute

Sources/Swiftly/Init.swift

@@ -76,6 +76,7 @@ internal struct Init: SwiftlyCommand {
             These locations can be changed with SWIFTLY_HOME and SWIFTLY_BIN environment variables and run this again.
             \(installMsg)
             """)
+
             guard SwiftlyCore.promptForConfirmation(defaultBehavior: true) else {
                 throw SwiftlyError(message: "Swiftly installation has been cancelled")
             }

Sources/SwiftlyCore/Platform.swift

@@ -209,6 +209,11 @@ extension Platform {
         if pgid != -1 {
             tcsetpgrp(STDOUT_FILENO, process.processIdentifier)
         }
+
+        defer { if pgid != -1 {
+            tcsetpgrp(STDOUT_FILENO, pgid)
+        }}
+
         process.waitUntilExit()
 
         guard process.terminationStatus == 0 else {
@@ -250,6 +255,10 @@ extension Platform {
         if pgid != -1 {
             tcsetpgrp(STDOUT_FILENO, process.processIdentifier)
         }
+        defer { if pgid != -1 {
+            tcsetpgrp(STDOUT_FILENO, pgid)
+        }}
+
         let outData = try outPipe.fileHandleForReading.readToEnd()
 
         process.waitUntilExit()