♻️ Separate some of the PHP config logic from the app

phpmon-common/Command.swift

@@ -1,6 +1,6 @@
 //
 //  Command.swift
-//  PMCommon
+//  phpmon-common
 //
 //  Copyright © 2021 Nico Verbruggen. All rights reserved.
 //

phpmon-common/Paths.swift

@@ -1,38 +1,24 @@
 //
 //  Paths.swift
-//  PMCommon
+//  phpmon-common
 //
 //  Copyright © 2021 Nico Verbruggen. All rights reserved.
 //
 
 import Foundation
 
-public enum HomebrewDir: String {
-    case opt = "/opt/homebrew"
-    case usr = "/usr/local"
-}
-
+/**
+ The `Paths` class is used to locate various binaries on the system,
+ and provides a full
+ */
 public class Paths {
     
     public static let shared = Paths()
-    var baseDir : HomebrewDir
+    
+    private var baseDir : Paths.HomebrewDir
     
     init() {
-        let optBrewFound = Shell.fileExists("\(HomebrewDir.opt.rawValue)/bin/brew")
-        let usrBrewFound = Shell.fileExists("\(HomebrewDir.usr.rawValue)/bin/brew")
-        
-        if (optBrewFound) {
-            // This is usually the case with Homebrew installed on Apple Silicon
-            baseDir = .opt
-        } else if (usrBrewFound) {
-            // This is usually the case with Homebrew installed on Intel (or Rosetta 2)
-            baseDir = .usr
-        } else {
-            // Falling back to default "legacy" Homebrew location (for Intel)
-            print("Seems like we couldn't determine the Homebrew directory.")
-            print("This usually means we're in trouble... (no Homebrew?)")
-            baseDir = .usr
-        }
+        baseDir = Shell.fileExists("\(HomebrewDir.opt.rawValue)/bin/brew") ? .opt : .usr
     }
     
     // - MARK: Binaries
@@ -71,4 +57,11 @@ public class Paths {
         return "\(shared.baseDir.rawValue)/etc"
     }
     
+    // MARK: - Enum
+    
+    public enum HomebrewDir: String {
+        case opt = "/opt/homebrew"
+        case usr = "/usr/local"
+    }
+    
 }

phpmon-common/PhpSwitcher.swift

@@ -0,0 +1,60 @@
+//
+//  PhpSwitcher.swift
+//  PHP Monitor
+//
+//  Created by Nico Verbruggen on 21/12/2021.
+//  Copyright © 2021 Nico Verbruggen. All rights reserved.
+//
+
+import Foundation
+
+protocol PhpSwitcherDelegate: AnyObject {
+    func switcherDidStartSwitching()
+    func switcherDidCompleteSwitch()
+}
+
+class PhpSwitcher {
+    
+    init() {
+        self.currentInstall = ActivePhpInstallation()
+    }
+    
+    /** The delegate that is informed of updates. */
+    weak var delegate: PhpSwitcherDelegate?
+
+    /** The static app instance. Accessible at any time. */
+    static let shared = PhpSwitcher()
+    
+    /** Whether the switcher is busy performing any actions. */
+    var isBusy: Bool = false
+    
+    /** All available versions of PHP. */
+    var availablePhpVersions: [String] = []
+    
+    /** Cached information about the PHP installations. */
+    var cachedPhpInstallations: [String: PhpInstallation] = [:]
+    
+    /** Static accessor for `PhpSwitcher.shared.currentInstall`. */
+    static var phpInstall: ActivePhpInstallation {
+        return Self.shared.currentInstall
+    }
+    
+    /** Information about the currently linked PHP installation. */
+    var currentInstall: ActivePhpInstallation
+    
+    /**
+     The version that the `php` formula via Brew is aliased to on the current system.
+     
+     If you're up to date, `php` will be aliased to the latest version,
+     but that might not be the case.
+     */
+    var brewPhpVersion: String {
+        return homebrewPackage.version
+    }
+    
+    /**
+     Information we were able to discern from the Homebrew info command.
+     */
+    var homebrewPackage: HomebrewPackage! = nil
+    
+}

phpmon-common/Shell.swift

@@ -1,6 +1,6 @@
 //
 //  Shell.swift
-//  PMCommon
+//  phpmon-common
 //
 //  Copyright © 2021 Nico Verbruggen. All rights reserved.
 //
@@ -80,7 +80,7 @@ public class Shell {
     public func executeSynchronously(
         _ command: String,
         requiresPath: Bool = false
-    ) -> ShellOutput {
+    ) -> Shell.Output {
         
         let outputPipe = Pipe()
         let errorPipe = Pipe()
@@ -91,7 +91,7 @@ public class Shell {
         task.launch()
         task.waitUntilExit()
     
-        return ShellOutput(
+        return Shell.Output(
             standardOutput: String(
                 data: outputPipe.fileHandleForReading.readDataToEndOfFile(),
                 encoding: .utf8
@@ -162,18 +162,18 @@ public class Shell {
             NotificationCenter.default.removeObserver(pipe.fileHandleForReading)
         }
     }
-}
-
-public class ShellOutput {
-    public let standardOutput: String
-    public let errorOutput: String
-    public let task: Process
     
-    init(standardOutput: String,
-         errorOutput: String,
-         task: Process) {
-        self.standardOutput = standardOutput
-        self.errorOutput = errorOutput
-        self.task = task
+    public class Output {
+        public let standardOutput: String
+        public let errorOutput: String
+        public let task: Process
+        
+        init(standardOutput: String,
+             errorOutput: String,
+             task: Process) {
+            self.standardOutput = standardOutput
+            self.errorOutput = errorOutput
+            self.task = task
+        }
     }
 }