✅ Use protocol so custom exports are easier to test

phpmon/Common/Core/Actions.swift

@@ -98,8 +98,7 @@ class Actions {
 
     public func openGlobalComposerFolder() {
         // Check if we have a custom COMPOSER_HOME set
-        if let shell = App.shared.container.shell as? TrackedShell,
-            let folder = shell.customExports["COMPOSER_HOME"] {
+        if let folder = App.shared.container.shell.exports["COMPOSER_HOME"] {
             let file = URL(string: "file://\(folder)/composer.json".replacingTildeWithHomeDirectory)!
             return NSWorkspace.shared.activateFileViewerSelecting([file] as [URL])
         }

phpmon/Common/Monitoring/TrackedShell.swift

@@ -60,27 +60,10 @@ final class TrackedShell: ShellProtocol {
     }
 
     // MARK: - Custom exports
-    // (probably should be part of the protocol?)
 
-    var customExports: [String: String] {
-        if let shell = self.shell as? RealShell {
-            return shell.exports
-        } else if let shell = self.shell as? TestableShell {
-            return shell.exports
-        } else {
-            assertionFailure("This shell does not support retrieving custom exports.")
-            return [:]
-        }
-    }
-
-    func setCustomExports(_ variables: [String: String]) {
-        if let shell = self.shell as? RealShell {
-            shell.exports = variables
-        } else if let shell = self.shell as? TestableShell {
-            shell.exports = variables
-        } else {
-            assertionFailure("Custom exports were set in `config.json`, but not applied because the shell does not support it.")
-        }
+    var exports: [String: String] {
+        get { shell.exports }
+        set { shell.exports = newValue }
     }
 
     func reloadEnvPath() {

phpmon/Common/Shell/ShellProtocol.swift

@@ -8,12 +8,18 @@
 
 import Foundation
 
-protocol ShellProtocol {
+protocol ShellProtocol: AnyObject {
     /**
      The PATH for the current shell.
      */
     var PATH: String { get }
 
+    /**
+     Exports are additional environment variables set by the user via the custom configuration.
+     These are populated when the configuration file is being loaded.
+     */
+    var exports: [String: String] { get set }
+
     /**
      Run a command synchronously. Use with caution!
 

phpmon/Domain/Preferences/CustomPrefs.swift

@@ -91,9 +91,8 @@ extension Preferences {
             Log.info("Configuring the additional exports...")
             Log.info("Custom exports: \(exports.description)")
 
-            if let shell = App.shared.container.shell as? TrackedShell {
-                shell.setCustomExports(exports)
-            }
+            // Assign the new exports values
+            container.shell.exports = exports
         }
     }
 }