♻️ Refactor PhpSwitcher into PhpEnv

phpmon-common/PHP/Switcher/InternalSwitcher.swift

@@ -0,0 +1,58 @@
+//
+//  InternalSwitcher.swift
+//  PHP Monitor
+//
+//  Created by Nico Verbruggen on 24/12/2021.
+//  Copyright © 2021 Nico Verbruggen. All rights reserved.
+//
+
+import Foundation
+
+class InternalSwitcher: PhpSwitcher {
+    
+    /**
+     Switching to a new PHP version involves:
+     - unlinking the current version
+     - stopping the active services
+     - linking the new desired version
+     
+     Please note that depending on which version is installed,
+     the version that is switched to may or may not be identical to `php`
+     (without @version).
+     */
+    func performSwitch(to version: String, completion: @escaping () -> Void)
+    {
+        Log.info("Switching to \(version), unlinking all versions...")
+        
+        let group = DispatchGroup()
+        
+        PhpEnv.shared.availablePhpVersions.forEach { (available) in
+            group.enter()
+            
+            DispatchQueue.global(qos: .userInitiated).async {
+                let formula = (available == PhpEnv.brewPhpVersion)
+                ? "php" : "php@\(available)"
+                
+                brew("unlink \(formula)")
+                brew("services stop \(formula)", sudo: true)
+                
+                Log.perf("Unlinked and stopped services for \(formula)")
+                
+                group.leave()
+            }
+        }
+        
+        group.notify(queue: .global(qos: .userInitiated)) {
+            Log.info("All versions have been unlinked!")
+            Log.info("Linking the new version!")
+            
+            let formula = (version == PhpEnv.brewPhpVersion) ? "php" : "php@\(version)"
+            brew("link \(formula) --overwrite --force")
+            brew("services start \(formula)", sudo: true)
+            
+            Log.info("The new version has been linked!")
+            completion()
+        }
+    }
+    
+}