From 4e0a471d81c9e11103236a58cfc1c1d2bddf71a5 Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Wed, 23 Oct 2024 12:00:34 -0400
Subject: [PATCH 1/6] Remove unnecessary function from `AppLibrary`.

Partial #313

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 Sources/mas/Controllers/AppLibrary.swift | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/Sources/mas/Controllers/AppLibrary.swift b/Sources/mas/Controllers/AppLibrary.swift
index ebdcd70..d05e180 100644
--- a/Sources/mas/Controllers/AppLibrary.swift
+++ b/Sources/mas/Controllers/AppLibrary.swift
@@ -13,12 +13,6 @@ protocol AppLibrary {
     /// Entire set of installed apps.
     var installedApps: [SoftwareProduct] { get }
 
-    /// Finds an app for appID.
-    ///
-    /// - Parameter appID: app ID for app.
-    /// - Returns: SoftwareProduct of app if found; nil otherwise.
-    func installedApp(withAppID appID: AppID) -> SoftwareProduct?
-
     /// Uninstalls an app.
     ///
     /// - Parameter app: App to be removed.

From 222646159d2a0d4162d29d02c1bafad16753bfa0 Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Wed, 23 Oct 2024 12:51:59 -0400
Subject: [PATCH 2/6] =?UTF-8?q?Refactor=20`AppLibrary.installedApp(?=
 =?UTF-8?q?=E2=80=A6)`=20as=20`AppLibrary.installedApps(=E2=80=A6)`=20beca?=
 =?UTF-8?q?use=20multiple=20installed=20apps=20can=20have=20the=20same=20a?=
 =?UTF-8?q?pp=20ID=20or=20app=20name.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Partial #313

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 Sources/mas/Commands/Install.swift       |  4 ++--
 Sources/mas/Commands/Lucky.swift         |  4 ++--
 Sources/mas/Commands/Purchase.swift      |  4 ++--
 Sources/mas/Commands/Uninstall.swift     | 14 +++++++++-----
 Sources/mas/Commands/Upgrade.swift       | 10 +++++-----
 Sources/mas/Controllers/AppLibrary.swift | 20 ++++++++++----------
 6 files changed, 30 insertions(+), 26 deletions(-)

diff --git a/Sources/mas/Commands/Install.swift b/Sources/mas/Commands/Install.swift
index 88c2688..1ba12b0 100644
--- a/Sources/mas/Commands/Install.swift
+++ b/Sources/mas/Commands/Install.swift
@@ -29,8 +29,8 @@ extension Mas {
         func run(appLibrary: AppLibrary) throws {
             // Try to download applications with given identifiers and collect results
             let appIDs = appIDs.filter { appID in
-                if let product = appLibrary.installedApp(withAppID: appID), !force {
-                    printWarning("\(product.appName) is already installed")
+                if let appName = appLibrary.installedApps(withAppID: appID).first?.appName, !force {
+                    printWarning("\(appName) is already installed")
                     return false
                 }
 
diff --git a/Sources/mas/Commands/Lucky.swift b/Sources/mas/Commands/Lucky.swift
index 16c7948..296dde7 100644
--- a/Sources/mas/Commands/Lucky.swift
+++ b/Sources/mas/Commands/Lucky.swift
@@ -58,8 +58,8 @@ extension Mas {
         /// - Throws: Any error that occurs while attempting to install the app.
         private func install(appID: AppID, appLibrary: AppLibrary) throws {
             // Try to download applications with given identifiers and collect results
-            if let product = appLibrary.installedApp(withAppID: appID), !force {
-                printWarning("\(product.appName) is already installed")
+            if let appName = appLibrary.installedApps(withAppID: appID).first?.appName, !force {
+                printWarning("\(appName) is already installed")
             } else {
                 do {
                     try downloadAll([appID]).wait()
diff --git a/Sources/mas/Commands/Purchase.swift b/Sources/mas/Commands/Purchase.swift
index 841d26d..58a7a48 100644
--- a/Sources/mas/Commands/Purchase.swift
+++ b/Sources/mas/Commands/Purchase.swift
@@ -26,8 +26,8 @@ extension Mas {
         func run(appLibrary: AppLibrary) throws {
             // Try to download applications with given identifiers and collect results
             let appIDs = appIDs.filter { appID in
-                if let product = appLibrary.installedApp(withAppID: appID) {
-                    printWarning("\(product.appName) has already been purchased.")
+                if let appName = appLibrary.installedApps(withAppID: appID).first?.appName {
+                    printWarning("\(appName) has already been purchased.")
                     return false
                 }
 
diff --git a/Sources/mas/Commands/Uninstall.swift b/Sources/mas/Commands/Uninstall.swift
index 632c84b..afb4b12 100644
--- a/Sources/mas/Commands/Uninstall.swift
+++ b/Sources/mas/Commands/Uninstall.swift
@@ -7,8 +7,7 @@
 //
 
 import ArgumentParser
-import CommerceKit
-import StoreFoundation
+import Foundation
 
 extension Mas {
     /// Command which uninstalls apps managed by the Mac App Store.
@@ -29,16 +28,21 @@ extension Mas {
         }
 
         func run(appLibrary: AppLibrary) throws {
-            guard let product = appLibrary.installedApp(withAppID: appID) else {
+            let installedApps = appLibrary.installedApps(withAppID: appID)
+            guard !installedApps.isEmpty else {
                 throw MASError.notInstalled
             }
 
             if dryRun {
-                printInfo("\(product.appName) \(product.bundlePath)")
+                for installedApp in installedApps {
+                    printInfo("\(installedApp.appName) \(installedApp.bundlePath)")
+                }
                 printInfo("(not removed, dry run)")
             } else {
                 do {
-                    try appLibrary.uninstallApp(app: product)
+                    for installedApp in installedApps {
+                        try appLibrary.uninstallApp(app: installedApp)
+                    }
                 } catch {
                     throw MASError.uninstallFailed
                 }
diff --git a/Sources/mas/Commands/Upgrade.swift b/Sources/mas/Commands/Upgrade.swift
index 4b3740b..83c4788 100644
--- a/Sources/mas/Commands/Upgrade.swift
+++ b/Sources/mas/Commands/Upgrade.swift
@@ -58,14 +58,14 @@ extension Mas {
             let apps =
                 appIDs.isEmpty
                 ? appLibrary.installedApps
-                : appIDs.compactMap { appID in
+                : appIDs.flatMap { appID in
                     if let appID = AppID(appID) {
-                        // argument is an AppID, lookup app by id using argument
-                        return appLibrary.installedApp(withAppID: appID)
+                        // argument is an AppID, lookup apps by id using argument
+                        return appLibrary.installedApps(withAppID: appID)
                     }
 
-                    // argument is not an AppID, lookup app by name using argument
-                    return appLibrary.installedApp(named: appID)
+                    // argument is not an AppID, lookup apps by name using argument
+                    return appLibrary.installedApps(named: appID)
                 }
 
             let promises = apps.map { installedApp in
diff --git a/Sources/mas/Controllers/AppLibrary.swift b/Sources/mas/Controllers/AppLibrary.swift
index d05e180..9bcebc7 100644
--- a/Sources/mas/Controllers/AppLibrary.swift
+++ b/Sources/mas/Controllers/AppLibrary.swift
@@ -22,20 +22,20 @@ protocol AppLibrary {
 
 /// Common logic
 extension AppLibrary {
-    /// Finds an app for appID.
+    /// Finds all installed instances of apps whose app ID is `appID`.
     ///
-    /// - Parameter appID: app ID for app.
-    /// - Returns: SoftwareProduct of app if found; nil otherwise.
-    func installedApp(withAppID appID: AppID) -> SoftwareProduct? {
+    /// - Parameter appID: app ID for app(s).
+    /// - Returns: [SoftwareProduct] of matching apps.
+    func installedApps(withAppID appID: AppID) -> [SoftwareProduct] {
         let appID = NSNumber(value: appID)
-        return installedApps.first { $0.itemIdentifier == appID }
+        return installedApps.filter { $0.itemIdentifier == appID }
     }
 
-    /// Finds an app by name.
+    /// Finds all installed instances of apps whose name is `appName`.
     ///
-    /// - Parameter appName: Full title of an app.
-    /// - Returns: Software Product of app if found; nil otherwise.
-    func installedApp(named appName: String) -> SoftwareProduct? {
-        installedApps.first { $0.appName == appName }
+    /// - Parameter appName: Full name of app(s).
+    /// - Returns: [SoftwareProduct] of matching apps.
+    func installedApps(named appName: String) -> [SoftwareProduct] {
+        installedApps.filter { $0.appName == appName }
     }
 }

From b0d2f23465f01bc82b06d9d98524f79f2af801c3 Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Wed, 23 Oct 2024 12:57:34 -0400
Subject: [PATCH 3/6] Add `appID` parameter to `MASError.notInstalled()`.

Partial #313

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 Sources/mas/Commands/Uninstall.swift            | 2 +-
 Sources/mas/Errors/MASError.swift               | 6 +++---
 Tests/masTests/Commands/UninstallSpec.swift     | 4 ++--
 Tests/masTests/Controllers/AppLibraryMock.swift | 2 +-
 Tests/masTests/Errors/MASErrorTestCase.swift    | 4 ++--
 5 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/Sources/mas/Commands/Uninstall.swift b/Sources/mas/Commands/Uninstall.swift
index afb4b12..25f8a6f 100644
--- a/Sources/mas/Commands/Uninstall.swift
+++ b/Sources/mas/Commands/Uninstall.swift
@@ -30,7 +30,7 @@ extension Mas {
         func run(appLibrary: AppLibrary) throws {
             let installedApps = appLibrary.installedApps(withAppID: appID)
             guard !installedApps.isEmpty else {
-                throw MASError.notInstalled
+                throw MASError.notInstalled(appID: appID)
             }
 
             if dryRun {
diff --git a/Sources/mas/Errors/MASError.swift b/Sources/mas/Errors/MASError.swift
index 28e6754..7065673 100644
--- a/Sources/mas/Errors/MASError.swift
+++ b/Sources/mas/Errors/MASError.swift
@@ -27,7 +27,7 @@ enum MASError: Error, Equatable {
     case noSearchResultsFound
     case noVendorWebsite
 
-    case notInstalled
+    case notInstalled(appID: AppID)
     case uninstallFailed
 
     case noData
@@ -80,8 +80,8 @@ extension MASError: CustomStringConvertible {
             return "No results found"
         case .noVendorWebsite:
             return "App does not have a vendor website"
-        case .notInstalled:
-            return "Not installed"
+        case .notInstalled(let appID):
+            return "No apps installed with app ID \(appID)"
         case .uninstallFailed:
             return "Uninstall failed"
         case .noData:
diff --git a/Tests/masTests/Commands/UninstallSpec.swift b/Tests/masTests/Commands/UninstallSpec.swift
index c6426c3..2d171cf 100644
--- a/Tests/masTests/Commands/UninstallSpec.swift
+++ b/Tests/masTests/Commands/UninstallSpec.swift
@@ -38,7 +38,7 @@ public class UninstallSpec: QuickSpec {
                     expect {
                         try uninstall.run(appLibrary: mockLibrary)
                     }
-                    .to(throwError(MASError.notInstalled))
+                    .to(throwError(MASError.notInstalled(appID: appID)))
                 }
                 it("finds an app") {
                     mockLibrary.installedApps.append(app)
@@ -58,7 +58,7 @@ public class UninstallSpec: QuickSpec {
                     expect {
                         try uninstall.run(appLibrary: mockLibrary)
                     }
-                    .to(throwError(MASError.notInstalled))
+                    .to(throwError(MASError.notInstalled(appID: appID)))
                 }
                 it("removes an app") {
                     mockLibrary.installedApps.append(app)
diff --git a/Tests/masTests/Controllers/AppLibraryMock.swift b/Tests/masTests/Controllers/AppLibraryMock.swift
index f763280..b2a9215 100644
--- a/Tests/masTests/Controllers/AppLibraryMock.swift
+++ b/Tests/masTests/Controllers/AppLibraryMock.swift
@@ -15,7 +15,7 @@ class AppLibraryMock: AppLibrary {
         if !installedApps.contains(where: { product -> Bool in
             app.itemIdentifier == product.itemIdentifier
         }) {
-            throw MASError.notInstalled
+            throw MASError.notInstalled(appID: app.itemIdentifier.appIDValue)
         }
 
         // Special case for testing where we pretend the trash command failed
diff --git a/Tests/masTests/Errors/MASErrorTestCase.swift b/Tests/masTests/Errors/MASErrorTestCase.swift
index fdc044e..06e1649 100644
--- a/Tests/masTests/Errors/MASErrorTestCase.swift
+++ b/Tests/masTests/Errors/MASErrorTestCase.swift
@@ -109,8 +109,8 @@ class MASErrorTestCase: XCTestCase {
     }
 
     func testNotInstalled() {
-        error = .notInstalled
-        XCTAssertEqual(error.description, "Not installed")
+        error = .notInstalled(appID: 123)
+        XCTAssertEqual(error.description, "No apps installed with app ID 123")
     }
 
     func testUninstallFailed() {

From 06ee9608be63ba88e5a4396800e331f70fc8c2ca Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Wed, 23 Oct 2024 14:04:02 -0400
Subject: [PATCH 4/6] Improve output.

Improve errors.

Simplify code.

Partial #313

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 Sources/mas/Commands/Uninstall.swift        |  2 +-
 Sources/mas/Controllers/MasAppLibrary.swift | 11 ++---------
 Sources/mas/Errors/MASError.swift           |  3 +++
 Tests/masTests/Commands/UninstallSpec.swift | 14 ++++++++------
 4 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/Sources/mas/Commands/Uninstall.swift b/Sources/mas/Commands/Uninstall.swift
index 25f8a6f..4e1e591 100644
--- a/Sources/mas/Commands/Uninstall.swift
+++ b/Sources/mas/Commands/Uninstall.swift
@@ -35,7 +35,7 @@ extension Mas {
 
             if dryRun {
                 for installedApp in installedApps {
-                    printInfo("\(installedApp.appName) \(installedApp.bundlePath)")
+                    printInfo("'\(installedApp.appName)' '\(installedApp.bundlePath)'")
                 }
                 printInfo("(not removed, dry run)")
             } else {
diff --git a/Sources/mas/Controllers/MasAppLibrary.swift b/Sources/mas/Controllers/MasAppLibrary.swift
index 9325af4..cb3b45f 100644
--- a/Sources/mas/Controllers/MasAppLibrary.swift
+++ b/Sources/mas/Controllers/MasAppLibrary.swift
@@ -38,8 +38,8 @@ class MasAppLibrary: AppLibrary {
     /// - Parameter app: App to be removed.
     /// - Throws: Error if there is a problem.
     func uninstallApp(app: SoftwareProduct) throws {
-        if !userIsRoot() {
-            printWarning("Apps installed from the Mac App Store require root permission to remove.")
+        if NSUserName() != "root" {
+            throw MASError.macOSUserMustBeRoot
         }
 
         let appUrl = URL(fileURLWithPath: app.bundlePath)
@@ -55,11 +55,4 @@ class MasAppLibrary: AppLibrary {
             throw MASError.uninstallFailed
         }
     }
-
-    /// Detects whether the current user is root.
-    ///
-    /// - Returns: true if the current user is root; false otherwise
-    private func userIsRoot() -> Bool {
-        NSUserName() == "root"
-    }
 }
diff --git a/Sources/mas/Errors/MASError.swift b/Sources/mas/Errors/MASError.swift
index 7065673..4eba734 100644
--- a/Sources/mas/Errors/MASError.swift
+++ b/Sources/mas/Errors/MASError.swift
@@ -29,6 +29,7 @@ enum MASError: Error, Equatable {
 
     case notInstalled(appID: AppID)
     case uninstallFailed
+    case macOSUserMustBeRoot
 
     case noData
     case jsonParsing(data: Data?)
@@ -84,6 +85,8 @@ extension MASError: CustomStringConvertible {
             return "No apps installed with app ID \(appID)"
         case .uninstallFailed:
             return "Uninstall failed"
+        case .macOSUserMustBeRoot:
+            return "Apps installed from the Mac App Store require root permission to remove."
         case .noData:
             return "Service did not return data"
         case .jsonParsing(let data):
diff --git a/Tests/masTests/Commands/UninstallSpec.swift b/Tests/masTests/Commands/UninstallSpec.swift
index 2d171cf..c2587fc 100644
--- a/Tests/masTests/Commands/UninstallSpec.swift
+++ b/Tests/masTests/Commands/UninstallSpec.swift
@@ -43,9 +43,11 @@ public class UninstallSpec: QuickSpec {
                 it("finds an app") {
                     mockLibrary.installedApps.append(app)
                     expect {
-                        try uninstall.run(appLibrary: mockLibrary)
+                        try captureStream(stdout) {
+                            try uninstall.run(appLibrary: mockLibrary)
+                        }
                     }
-                    .toNot(throwError())
+                        == "==> 'Some App' '/tmp/Some.app'\n==> (not removed, dry run)\n"
                 }
             }
             context("wet run") {
@@ -67,12 +69,12 @@ public class UninstallSpec: QuickSpec {
                             try uninstall.run(appLibrary: mockLibrary)
                         }
                     }
-                        == "==> Some App /tmp/Some.app\n==> (not removed, dry run)\n"
+                    .toNot(throwError())
                 }
                 it("fails if there is a problem with the trash command") {
-                    var brokenUninstall = app
-                    brokenUninstall.bundlePath = "/dev/null"
-                    mockLibrary.installedApps.append(brokenUninstall)
+                    var brokenApp = app
+                    brokenApp.bundlePath = "/dev/null"
+                    mockLibrary.installedApps.append(brokenApp)
                     expect {
                         try uninstall.run(appLibrary: mockLibrary)
                     }

From 53c64b17581429caa3a1ad0fcf6b677574231916 Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Wed, 23 Oct 2024 14:11:52 -0400
Subject: [PATCH 5/6] Improve errors.

Partial #313

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 Sources/mas/Commands/Uninstall.swift            | 2 +-
 Sources/mas/Controllers/MasAppLibrary.swift     | 3 +--
 Sources/mas/Errors/MASError.swift               | 7 +++++--
 Tests/masTests/Commands/UninstallSpec.swift     | 2 +-
 Tests/masTests/Controllers/AppLibraryMock.swift | 2 +-
 Tests/masTests/Errors/MASErrorTestCase.swift    | 2 +-
 6 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/Sources/mas/Commands/Uninstall.swift b/Sources/mas/Commands/Uninstall.swift
index 4e1e591..9d7c3a9 100644
--- a/Sources/mas/Commands/Uninstall.swift
+++ b/Sources/mas/Commands/Uninstall.swift
@@ -44,7 +44,7 @@ extension Mas {
                         try appLibrary.uninstallApp(app: installedApp)
                     }
                 } catch {
-                    throw MASError.uninstallFailed
+                    throw error as? MASError ?? MASError.uninstallFailed(error: error as NSError)
                 }
             }
         }
diff --git a/Sources/mas/Controllers/MasAppLibrary.swift b/Sources/mas/Controllers/MasAppLibrary.swift
index cb3b45f..7554d3c 100644
--- a/Sources/mas/Controllers/MasAppLibrary.swift
+++ b/Sources/mas/Controllers/MasAppLibrary.swift
@@ -51,8 +51,7 @@ class MasAppLibrary: AppLibrary {
                 printInfo("App moved to trash: \(path)")
             }
         } catch {
-            printError("Unable to move app to trash.")
-            throw MASError.uninstallFailed
+            throw MASError.uninstallFailed(error: error as NSError)
         }
     }
 }
diff --git a/Sources/mas/Errors/MASError.swift b/Sources/mas/Errors/MASError.swift
index 4eba734..564afb6 100644
--- a/Sources/mas/Errors/MASError.swift
+++ b/Sources/mas/Errors/MASError.swift
@@ -28,7 +28,7 @@ enum MASError: Error, Equatable {
     case noVendorWebsite
 
     case notInstalled(appID: AppID)
-    case uninstallFailed
+    case uninstallFailed(error: NSError?)
     case macOSUserMustBeRoot
 
     case noData
@@ -83,7 +83,10 @@ extension MASError: CustomStringConvertible {
             return "App does not have a vendor website"
         case .notInstalled(let appID):
             return "No apps installed with app ID \(appID)"
-        case .uninstallFailed:
+        case .uninstallFailed(let error):
+            if let error {
+                return "Uninstall failed: \(error.localizedDescription)"
+            }
             return "Uninstall failed"
         case .macOSUserMustBeRoot:
             return "Apps installed from the Mac App Store require root permission to remove."
diff --git a/Tests/masTests/Commands/UninstallSpec.swift b/Tests/masTests/Commands/UninstallSpec.swift
index c2587fc..dd342a0 100644
--- a/Tests/masTests/Commands/UninstallSpec.swift
+++ b/Tests/masTests/Commands/UninstallSpec.swift
@@ -78,7 +78,7 @@ public class UninstallSpec: QuickSpec {
                     expect {
                         try uninstall.run(appLibrary: mockLibrary)
                     }
-                    .to(throwError(MASError.uninstallFailed))
+                    .to(throwError(MASError.uninstallFailed(error: nil)))
                 }
             }
         }
diff --git a/Tests/masTests/Controllers/AppLibraryMock.swift b/Tests/masTests/Controllers/AppLibraryMock.swift
index b2a9215..e4daad1 100644
--- a/Tests/masTests/Controllers/AppLibraryMock.swift
+++ b/Tests/masTests/Controllers/AppLibraryMock.swift
@@ -20,7 +20,7 @@ class AppLibraryMock: AppLibrary {
 
         // Special case for testing where we pretend the trash command failed
         if app.bundlePath == "/dev/null" {
-            throw MASError.uninstallFailed
+            throw MASError.uninstallFailed(error: nil)
         }
 
         // Success is the default, watch out for false positives!
diff --git a/Tests/masTests/Errors/MASErrorTestCase.swift b/Tests/masTests/Errors/MASErrorTestCase.swift
index 06e1649..47c83d6 100644
--- a/Tests/masTests/Errors/MASErrorTestCase.swift
+++ b/Tests/masTests/Errors/MASErrorTestCase.swift
@@ -114,7 +114,7 @@ class MASErrorTestCase: XCTestCase {
     }
 
     func testUninstallFailed() {
-        error = .uninstallFailed
+        error = .uninstallFailed(error: nil)
         XCTAssertEqual(error.description, "Uninstall failed")
     }
 

From 98c85ac6d628a881d53b4e32027a6832e6f57ccc Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Wed, 23 Oct 2024 14:20:31 -0400
Subject: [PATCH 6/6] Delete apps via Scripting Bridge to Finder.

Resolve #313

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 .swiftformat                                  |   1 +
 Sources/mas/Commands/Uninstall.swift          |  25 +-
 Sources/mas/Controllers/AppLibrary.swift      |   8 +-
 Sources/mas/Controllers/Finder.swift          | 733 ++++++++++++++++++
 Sources/mas/Controllers/MasAppLibrary.swift   | 134 +++-
 Sources/mas/Errors/MASError.swift             |   4 +
 Tests/masTests/Commands/UninstallSpec.swift   |   6 +-
 .../masTests/Controllers/AppLibraryMock.swift |  12 +-
 8 files changed, 885 insertions(+), 38 deletions(-)
 create mode 100644 Sources/mas/Controllers/Finder.swift

diff --git a/.swiftformat b/.swiftformat
index 90ad275..9089de8 100644
--- a/.swiftformat
+++ b/.swiftformat
@@ -32,6 +32,7 @@
 # Rule options
 --commas always
 --extensionacl on-declarations
+--hexliteralcase lowercase
 --importgrouping testable-last
 --lineaftermarks false
 --ranges no-space
diff --git a/Sources/mas/Commands/Uninstall.swift b/Sources/mas/Commands/Uninstall.swift
index 9d7c3a9..b73378b 100644
--- a/Sources/mas/Commands/Uninstall.swift
+++ b/Sources/mas/Commands/Uninstall.swift
@@ -28,6 +28,21 @@ extension Mas {
         }
 
         func run(appLibrary: AppLibrary) throws {
+            guard NSUserName() == "root" else {
+                throw MASError.macOSUserMustBeRoot
+            }
+
+            guard let username = getSudoUsername() else {
+                throw MASError.runtimeError("Could not determine the original username")
+            }
+
+            guard
+                let uid = getSudoUID(),
+                seteuid(uid) == 0
+            else {
+                throw MASError.runtimeError("Failed to switch effective user from 'root' to '\(username)'")
+            }
+
             let installedApps = appLibrary.installedApps(withAppID: appID)
             guard !installedApps.isEmpty else {
                 throw MASError.notInstalled(appID: appID)
@@ -39,13 +54,11 @@ extension Mas {
                 }
                 printInfo("(not removed, dry run)")
             } else {
-                do {
-                    for installedApp in installedApps {
-                        try appLibrary.uninstallApp(app: installedApp)
-                    }
-                } catch {
-                    throw error as? MASError ?? MASError.uninstallFailed(error: error as NSError)
+                guard seteuid(0) == 0 else {
+                    throw MASError.runtimeError("Failed to revert effective user from '\(username)' back to 'root'")
                 }
+
+                try appLibrary.uninstallApps(atPaths: installedApps.map(\.bundlePath))
             }
         }
     }
diff --git a/Sources/mas/Controllers/AppLibrary.swift b/Sources/mas/Controllers/AppLibrary.swift
index 9bcebc7..cd0432e 100644
--- a/Sources/mas/Controllers/AppLibrary.swift
+++ b/Sources/mas/Controllers/AppLibrary.swift
@@ -13,11 +13,11 @@ protocol AppLibrary {
     /// Entire set of installed apps.
     var installedApps: [SoftwareProduct] { get }
 
-    /// Uninstalls an app.
+    /// Uninstalls all apps located at any of the elements of `appPaths`.
     ///
-    /// - Parameter app: App to be removed.
-    /// - Throws: Error if there is a problem.
-    func uninstallApp(app: SoftwareProduct) throws
+    /// - Parameter appPaths: Paths to apps to be uninstalled.
+    /// - Throws: Error if any problem occurs.
+    func uninstallApps(atPaths appPaths: [String]) throws
 }
 
 /// Common logic
diff --git a/Sources/mas/Controllers/Finder.swift b/Sources/mas/Controllers/Finder.swift
new file mode 100644
index 0000000..a8133c2
--- /dev/null
+++ b/Sources/mas/Controllers/Finder.swift
@@ -0,0 +1,733 @@
+// swift-format-ignore-file
+// swiftlint:disable:next blanket_disable_command
+// swiftlint:disable attributes discouraged_none_name file_length file_types_order identifier_name
+// swiftlint:disable:next blanket_disable_command
+// swiftlint:disable implicitly_unwrapped_optional line_length missing_docs
+import AppKit
+import ScriptingBridge
+
+// MARK: FinderEdfm
+@objc
+public enum FinderEdfm: AEKeyword {
+    case macOSFormat = 0x6466_6866 // 'dfhf'
+    case macOSExtendedFormat = 0x6466_682b // 'dfh+'
+    case ufsFormat = 0x6466_7566 // 'dfuf'
+    case nfsFormat = 0x6466_6e66 // 'dfnf'
+    case audioFormat = 0x6466_6175 // 'dfau'
+    case proDOSFormat = 0x6466_7072 // 'dfpr'
+    case msdosFormat = 0x6466_6d73 // 'dfms'
+    case ntfsFormat = 0x6466_6e74 // 'dfnt'
+    case iso9660Format = 0x6466_3936 // 'df96'
+    case highSierraFormat = 0x6466_6873 // 'dfhs'
+    case quickTakeFormat = 0x6466_7174 // 'dfqt'
+    case applePhotoFormat = 0x6466_7068 // 'dfph'
+    case appleShareFormat = 0x6466_6173 // 'dfas'
+    case udfFormat = 0x6466_7564 // 'dfud'
+    case webDAVFormat = 0x6466_7764 // 'dfwd'
+    case ftpFormat = 0x6466_6674 // 'dfft'
+    case packetWrittenUDFFormat = 0x6466_7075 // 'dfpu'
+    case xsanFormat = 0x6466_6163 // 'dfac'
+    case apfsFormat = 0x6466_6170 // 'dfap'
+    case exFATFormat = 0x6466_7866 // 'dfxf'
+    case smbFormat = 0x6466_736d // 'dfsm'
+    case unknownFormat = 0x6466_3f3f // 'df??'
+}
+
+// MARK: FinderIpnl
+@objc
+public enum FinderIpnl: AEKeyword {
+    case generalInformationPanel = 0x6770_6e6c // 'gpnl'
+    case sharingPanel = 0x7370_6e6c // 'spnl'
+    case memoryPanel = 0x6d70_6e6c // 'mpnl'
+    case previewPanel = 0x7670_6e6c // 'vpnl'
+    case applicationPanel = 0x6170_6e6c // 'apnl'
+    case languagesPanel = 0x706b_6c67 // 'pklg'
+    case pluginsPanel = 0x706b_7067 // 'pkpg'
+    case nameExtensionPanel = 0x6e70_6e6c // 'npnl'
+    case commentsPanel = 0x6370_6e6c // 'cpnl'
+    case contentIndexPanel = 0x6369_6e6c // 'cinl'
+    case burningPanel = 0x6270_6e6c // 'bpnl'
+    case moreInfoPanel = 0x6d69_6e6c // 'minl'
+    case simpleHeaderPanel = 0x7368_6e6c // 'shnl'
+}
+
+// MARK: FinderPple
+@objc
+public enum FinderPple: AEKeyword {
+    case generalPreferencesPanel = 0x7067_6e70 // 'pgnp'
+    case labelPreferencesPanel = 0x706c_6270 // 'plbp'
+    case sidebarPreferencesPanel = 0x7073_6964 // 'psid'
+    case advancedPreferencesPanel = 0x7061_6476 // 'padv'
+}
+
+// MARK: FinderPriv
+@objc
+public enum FinderPriv: AEKeyword {
+    case readOnly = 0x7265_6164 // 'read'
+    case readWrite = 0x7264_7772 // 'rdwr'
+    case writeOnly = 0x7772_6974 // 'writ'
+    case none = 0x6e6f_6e65 // 'none'
+}
+
+// MARK: FinderEcvw
+@objc
+public enum FinderEcvw: AEKeyword {
+    case iconView = 0x6963_6e76 // 'icnv'
+    case listView = 0x6c73_7677 // 'lsvw'
+    case columnView = 0x636c_7677 // 'clvw'
+    case groupView = 0x6772_7677 // 'grvw'
+    case flowView = 0x666c_7677 // 'flvw'
+}
+
+// MARK: FinderEarr
+@objc
+public enum FinderEarr: AEKeyword {
+    case notArranged = 0x6e61_7272 // 'narr'
+    case snapToGrid = 0x6772_6461 // 'grda'
+    case arrangedByName = 0x6e61_6d61 // 'nama'
+    case arrangedByModificationDate = 0x6d64_7461 // 'mdta'
+    case arrangedByCreationDate = 0x6364_7461 // 'cdta'
+    case arrangedBySize = 0x7369_7a61 // 'siza'
+    case arrangedByKind = 0x6b69_6e61 // 'kina'
+    case arrangedByLabel = 0x6c61_6261 // 'laba'
+}
+
+// MARK: FinderEpos
+@objc
+public enum FinderEpos: AEKeyword {
+    case right = 0x6c72_6774 // 'lrgt'
+    case bottom = 0x6c62_6f74 // 'lbot'
+}
+
+// MARK: FinderSodr
+@objc
+public enum FinderSodr: AEKeyword {
+    case normal = 0x736e_726d // 'snrm'
+    case reversed = 0x7372_7673 // 'srvs'
+}
+
+// MARK: FinderElsv
+@objc
+public enum FinderElsv: AEKeyword {
+    case nameColumn = 0x656c_736e // 'elsn'
+    case modificationDateColumn = 0x656c_736d // 'elsm'
+    case creationDateColumn = 0x656c_7363 // 'elsc'
+    case sizeColumn = 0x656c_7373 // 'elss'
+    case kindColumn = 0x656c_736b // 'elsk'
+    case labelColumn = 0x656c_736c // 'elsl'
+    case versionColumn = 0x656c_7376 // 'elsv'
+    case commentColumn = 0x656c_7343 // 'elsC'
+}
+
+// MARK: FinderLvic
+@objc
+public enum FinderLvic: AEKeyword {
+    case smallIcon = 0x736d_6963 // 'smic'
+    case largeIcon = 0x6c67_6963 // 'lgic'
+}
+
+@objc
+public protocol SBObjectProtocol: NSObjectProtocol {
+    func get() -> Any!
+}
+
+@objc
+public protocol SBApplicationProtocol: SBObjectProtocol {
+    var delegate: SBApplicationDelegate! { get set }
+    var isRunning: Bool { get }
+
+    func activate()
+}
+
+// MARK: FinderGenericMethods
+@objc
+public protocol FinderGenericMethods {
+    @objc optional func openUsing(_ using_: SBObject!, withProperties: [AnyHashable: Any]!) // Open the specified object(s)
+    @objc optional func printWithProperties(_ withProperties: [AnyHashable: Any]!) // Print the specified object(s)
+    @objc optional func activate() // Activate the specified window (or the Finder)
+    @objc optional func close() // Close an object
+    @objc optional func dataSizeAs(_ as: NSNumber!) -> Int // Return the size in bytes of an object
+    @objc optional func delete() -> SBObject // Move an item from its container to the trash
+    @objc optional func duplicateTo(_ to: SBObject!, replacing: Bool, routingSuppressed: Bool, exactCopy: Bool) -> SBObject // Duplicate one or more object(s)
+    @objc optional func exists() -> Bool // Verify if an object exists
+    @objc optional func moveTo(_ to: SBObject!, replacing: Bool, positionedAt: [Any]!, routingSuppressed: Bool) -> SBObject // Move object(s) to a new location
+    @objc optional func select() // Select the specified object(s)
+    @objc optional func sortBy(_ by: Selector) -> SBObject // Return the specified object(s) in a sorted list
+    @objc optional func cleanUpBy(_ by: Selector) // Arrange items in window nicely (only applies to open windows in icon view that are not kept arranged)
+    @objc optional func eject() // Eject the specified disk(s)
+    @objc optional func emptySecurity(_ security: Bool) // Empty the trash
+    @objc optional func erase() // (NOT AVAILABLE) Erase the specified disk(s)
+    @objc optional func reveal() // Bring the specified object(s) into view
+    @objc optional func updateNecessity(_ necessity: Bool, registeringApplications: Bool) // Update the display of the specified object(s) to match their on-disk representation
+}
+
+// MARK: FinderApplication
+@objc
+public protocol FinderApplication: SBApplicationProtocol {
+    @objc optional var clipboard: SBObject { get } // (NOT AVAILABLE YET) the Finder’s clipboard window (copy)
+    @objc optional var name: String { get } // the Finder’s name (copy)
+    @objc optional var visible: Bool { get } // Is the Finder’s layer visible?
+    @objc optional var frontmost: Bool { get } // Is the Finder the frontmost process?
+    @objc optional var selection: SBObject { get } // the selection in the frontmost Finder window (copy)
+    @objc optional var insertionLocation: SBObject { get } // the container in which a new folder would appear if “New Folder” was selected (copy)
+    @objc optional var productVersion: String { get } // the version of the System software running on this computer (copy)
+    @objc optional var version: String { get } // the version of the Finder (copy)
+    @objc optional var startupDisk: FinderDisk { get } // the startup disk (copy)
+    @objc optional var desktop: FinderDesktopObject { get } // the desktop (copy)
+    @objc optional var trash: FinderTrashObject { get } // the trash (copy)
+    @objc optional var home: FinderFolder { get } // the home directory (copy)
+    @objc optional var computerContainer: FinderComputerObject { get } // the computer location (as in Go > Computer) (copy)
+    @objc optional var FinderPreferences: FinderPreferences { get } // Various preferences that apply to the Finder as a whole (copy)
+
+    @objc optional var desktopPicture: FinderFile { get } // the desktop picture of the main monitor
+
+    @objc optional func setDesktopPicture(_ desktopPicture: FinderFile!) // the desktop picture of the main monitor
+
+    @objc optional func items() -> SBElementArray
+    @objc optional func containers() -> SBElementArray
+    @objc optional func disks() -> SBElementArray
+    @objc optional func folders() -> SBElementArray
+    @objc optional func files() -> SBElementArray
+    @objc optional func aliasFiles() -> SBElementArray
+    @objc optional func applicationFiles() -> SBElementArray
+    @objc optional func documentFiles() -> SBElementArray
+    @objc optional func internetLocationFiles() -> SBElementArray
+    @objc optional func clippings() -> SBElementArray
+    @objc optional func packages() -> SBElementArray
+    @objc optional func windows() -> SBElementArray
+    @objc optional func FinderWindows() -> SBElementArray
+    @objc optional func clippingWindows() -> SBElementArray
+
+    @objc optional func quit() // Quit the Finder
+    @objc optional func activate() // Activate the specified window (or the Finder)
+    @objc optional func copy() // (NOT AVAILABLE YET) Copy the selected items to the clipboard (the Finder must be the front application)
+    @objc optional func eject() // Eject the specified disk(s)
+    @objc optional func emptySecurity(_ security: Bool) // Empty the trash
+    @objc optional func restart() // Restart the computer
+    @objc optional func shutDown() // Shut Down the computer
+    @objc optional func sleep() // Put the computer to sleep
+    @objc optional func setVisible(_ visible: Bool) // Is the Finder’s layer visible?
+    @objc optional func setFrontmost(_ frontmost: Bool) // Is the Finder the frontmost process?
+    @objc optional func setSelection(_ selection: SBObject!) // the selection in the frontmost Finder window
+}
+
+extension SBApplication: FinderApplication {}
+
+// MARK: FinderItem
+@objc
+public protocol FinderItem: SBObjectProtocol, FinderGenericMethods {
+    @objc optional var name: String { get } // the name of the item (copy)
+    @objc optional var displayedName: String { get } // the user-visible name of the item (copy)
+    @objc optional var nameExtension: String { get } // the name extension of the item (such as “txt”) (copy)
+    @objc optional var extensionHidden: Bool { get } // Is the item's extension hidden from the user?
+    @objc optional var index: Int { get } // the index in the front-to-back ordering within its container
+    @objc optional var container: SBObject { get } // the container of the item (copy)
+    @objc optional var disk: SBObject { get } // the disk on which the item is stored (copy)
+    @objc optional var position: NSPoint { get } // the position of the item within its parent window (can only be set for an item in a window viewed as icons or buttons)
+    @objc optional var desktopPosition: NSPoint { get } // the position of the item on the desktop
+    @objc optional var bounds: NSRect { get } // the bounding rectangle of the item (can only be set for an item in a window viewed as icons or buttons)
+    @objc optional var labelIndex: Int { get } // the label of the item
+    @objc optional var locked: Bool { get } // Is the file locked?
+    @objc optional var kind: String { get } // the kind of the item (copy)
+    @objc optional var objectDescription: String { get } // a description of the item (copy)
+    @objc optional var comment: String { get } // the comment of the item, displayed in the “Get Info” window (copy)
+    @objc optional var size: Int64 { get } // the logical size of the item
+    @objc optional var physicalSize: Int64 { get } // the actual space used by the item on disk
+    @objc optional var creationDate: Date { get } // the date on which the item was created (copy)
+    @objc optional var modificationDate: Date { get } // the date on which the item was last modified (copy)
+    @objc optional var icon: FinderIconFamily { get } // the icon bitmap of the item (copy)
+    @objc optional var URL: String { get } // the URL of the item (copy)
+    @objc optional var owner: String { get } // the user that owns the container (copy)
+    @objc optional var group: String { get } // the user or group that has special access to the container (copy)
+    @objc optional var ownerPrivileges: FinderPriv { get }
+    @objc optional var groupPrivileges: FinderPriv { get }
+    @objc optional var everyonesPrivileges: FinderPriv { get }
+    @objc optional var informationWindow: SBObject { get } // the information window for the item (copy)
+    @objc optional var properties: [AnyHashable: Any] { get } // every property of an item (copy)
+
+    @objc optional func setName(_ name: String!) // the name of the item
+    @objc optional func setNameExtension(_ nameExtension: String!) // the name extension of the item (such as “txt”)
+    @objc optional func setExtensionHidden(_ extensionHidden: Bool) // Is the item's extension hidden from the user?
+    @objc optional func setPosition(_ position: NSPoint) // the position of the item within its parent window (can only be set for an item in a window viewed as icons or buttons)
+    @objc optional func setDesktopPosition(_ desktopPosition: NSPoint) // the position of the item on the desktop
+    @objc optional func setBounds(_ bounds: NSRect) // the bounding rectangle of the item (can only be set for an item in a window viewed as icons or buttons)
+    @objc optional func setLabelIndex(_ labelIndex: Int) // the label of the item
+    @objc optional func setLocked(_ locked: Bool) // Is the file locked?
+    @objc optional func setComment(_ comment: String!) // the comment of the item, displayed in the “Get Info” window
+    @objc optional func setModificationDate(_ modificationDate: Date!) // the date on which the item was last modified
+    @objc optional func setIcon(_ icon: FinderIconFamily!) // the icon bitmap of the item
+    @objc optional func setOwner(_ owner: String!) // the user that owns the container
+    @objc optional func setGroup(_ group: String!) // the user or group that has special access to the container
+    @objc optional func setOwnerPrivileges(_ ownerPrivileges: FinderPriv)
+    @objc optional func setGroupPrivileges(_ groupPrivileges: FinderPriv)
+    @objc optional func setEveryonesPrivileges(_ everyonesPrivileges: FinderPriv)
+    @objc optional func setProperties(_ properties: [AnyHashable: Any]!) // every property of an item
+}
+
+extension SBObject: FinderItem {}
+
+// MARK: FinderContainer
+@objc
+public protocol FinderContainer: FinderItem {
+    @objc optional var entireContents: SBObject { get } // the entire contents of the container, including the contents of its children (copy)
+    @objc optional var expandable: Bool { get } // (NOT AVAILABLE YET) Is the container capable of being expanded as an outline?
+    @objc optional var expanded: Bool { get } // (NOT AVAILABLE YET) Is the container opened as an outline? (can only be set for containers viewed as lists)
+    @objc optional var completelyExpanded: Bool { get } // (NOT AVAILABLE YET) Are the container and all of its children opened as outlines? (can only be set for containers viewed as lists)
+    @objc optional var containerWindow: SBObject { get } // the container window for this folder (copy)
+
+    @objc optional func setExpanded(_ expanded: Bool) // (NOT AVAILABLE YET) Is the container opened as an outline? (can only be set for containers viewed as lists)
+    @objc optional func setCompletelyExpanded(_ completelyExpanded: Bool) // (NOT AVAILABLE YET) Are the container and all of its children opened as outlines? (can only be set for containers viewed as lists)
+
+    @objc optional func items() -> SBElementArray
+    @objc optional func containers() -> SBElementArray
+    @objc optional func folders() -> SBElementArray
+    @objc optional func files() -> SBElementArray
+    @objc optional func aliasFiles() -> SBElementArray
+    @objc optional func applicationFiles() -> SBElementArray
+    @objc optional func documentFiles() -> SBElementArray
+    @objc optional func internetLocationFiles() -> SBElementArray
+    @objc optional func clippings() -> SBElementArray
+    @objc optional func packages() -> SBElementArray
+}
+
+extension SBObject: FinderContainer {}
+
+// MARK: FinderComputerObject
+@objc
+public protocol FinderComputerObject: FinderItem {}
+
+extension SBObject: FinderComputerObject {}
+
+// MARK: FinderDisk
+@objc
+public protocol FinderDisk: FinderContainer {
+    @objc optional var capacity: Int64 { get } // the total number of bytes (free or used) on the disk
+    @objc optional var freeSpace: Int64 { get } // the number of free bytes left on the disk
+    @objc optional var ejectable: Bool { get } // Can the media be ejected (floppies, CDs, and so on)?
+    @objc optional var localVolume: Bool { get } // Is the media a local volume (as opposed to a file server)?
+    @objc optional var startup: Bool { get } // Is this disk the boot disk?
+    @objc optional var format: FinderEdfm { get } // the filesystem format of this disk
+    @objc optional var journalingEnabled: Bool { get } // Does this disk do file system journaling?
+    @objc optional var ignorePrivileges: Bool { get } // Ignore permissions on this disk?
+
+    @objc optional func setIgnorePrivileges(_ ignorePrivileges: Bool) // Ignore permissions on this disk?
+
+    @objc optional func id() -> Int // the unique id for this disk (unchanged while disk remains connected and Finder remains running)
+
+    @objc optional func items() -> SBElementArray
+    @objc optional func containers() -> SBElementArray
+    @objc optional func folders() -> SBElementArray
+    @objc optional func files() -> SBElementArray
+    @objc optional func aliasFiles() -> SBElementArray
+    @objc optional func applicationFiles() -> SBElementArray
+    @objc optional func documentFiles() -> SBElementArray
+    @objc optional func internetLocationFiles() -> SBElementArray
+    @objc optional func clippings() -> SBElementArray
+    @objc optional func packages() -> SBElementArray
+}
+
+extension SBObject: FinderDisk {}
+
+// MARK: FinderFolder
+@objc
+public protocol FinderFolder: FinderContainer {
+    @objc optional func items() -> SBElementArray
+    @objc optional func containers() -> SBElementArray
+    @objc optional func folders() -> SBElementArray
+    @objc optional func files() -> SBElementArray
+    @objc optional func aliasFiles() -> SBElementArray
+    @objc optional func applicationFiles() -> SBElementArray
+    @objc optional func documentFiles() -> SBElementArray
+    @objc optional func internetLocationFiles() -> SBElementArray
+    @objc optional func clippings() -> SBElementArray
+    @objc optional func packages() -> SBElementArray
+}
+
+extension SBObject: FinderFolder {}
+
+// MARK: FinderDesktopObject
+@objc
+public protocol FinderDesktopObject: FinderContainer {
+    @objc optional func items() -> SBElementArray
+    @objc optional func containers() -> SBElementArray
+    @objc optional func disks() -> SBElementArray
+    @objc optional func folders() -> SBElementArray
+    @objc optional func files() -> SBElementArray
+    @objc optional func aliasFiles() -> SBElementArray
+    @objc optional func applicationFiles() -> SBElementArray
+    @objc optional func documentFiles() -> SBElementArray
+    @objc optional func internetLocationFiles() -> SBElementArray
+    @objc optional func clippings() -> SBElementArray
+    @objc optional func packages() -> SBElementArray
+}
+
+extension SBObject: FinderDesktopObject {}
+
+// MARK: FinderTrashObject
+@objc
+public protocol FinderTrashObject: FinderContainer {
+    @objc optional var warnsBeforeEmptying: Bool { get } // Display a dialog when emptying the trash?
+
+    @objc optional func setWarnsBeforeEmptying(_ warnsBeforeEmptying: Bool) // Display a dialog when emptying the trash?
+
+    @objc optional func items() -> SBElementArray
+    @objc optional func containers() -> SBElementArray
+    @objc optional func folders() -> SBElementArray
+    @objc optional func files() -> SBElementArray
+    @objc optional func aliasFiles() -> SBElementArray
+    @objc optional func applicationFiles() -> SBElementArray
+    @objc optional func documentFiles() -> SBElementArray
+    @objc optional func internetLocationFiles() -> SBElementArray
+    @objc optional func clippings() -> SBElementArray
+    @objc optional func packages() -> SBElementArray
+}
+
+extension SBObject: FinderTrashObject {}
+
+// MARK: FinderFile
+@objc
+public protocol FinderFile: FinderItem {
+    @objc optional var fileType: NSNumber { get } // the OSType identifying the type of data contained in the item (copy)
+    @objc optional var creatorType: NSNumber { get } // the OSType identifying the application that created the item (copy)
+    @objc optional var stationery: Bool { get } // Is the file a stationery pad?
+    @objc optional var productVersion: String { get } // the version of the product (visible at the top of the “Get Info” window) (copy)
+    @objc optional var version: String { get } // the version of the file (visible at the bottom of the “Get Info” window) (copy)
+
+    @objc optional func setFileType(_ fileType: NSNumber!) // the OSType identifying the type of data contained in the item
+    @objc optional func setCreatorType(_ creatorType: NSNumber!) // the OSType identifying the application that created the item
+    @objc optional func setStationery(_ stationery: Bool) // Is the file a stationery pad?
+}
+
+extension SBObject: FinderFile {}
+
+// MARK: FinderAliasFile
+@objc
+public protocol FinderAliasFile: FinderFile {
+    @objc optional var originalItem: SBObject { get } // the original item pointed to by the alias (copy)
+
+    @objc optional func setOriginalItem(_ originalItem: SBObject!) // the original item pointed to by the alias
+}
+
+extension SBObject: FinderAliasFile {}
+
+// MARK: FinderApplicationFile
+@objc
+public protocol FinderApplicationFile: FinderFile {
+    @objc optional var suggestedSize: Int { get } // (AVAILABLE IN 10.1 TO 10.4) the memory size with which the developer recommends the application be launched
+    @objc optional var minimumSize: Int { get } // (AVAILABLE IN 10.1 TO 10.4) the smallest memory size with which the application can be launched
+    @objc optional var preferredSize: Int { get } // (AVAILABLE IN 10.1 TO 10.4) the memory size with which the application will be launched
+    @objc optional var acceptsHighLevelEvents: Bool { get } // Is the application high-level event aware? (OBSOLETE: always returns true)
+    @objc optional var hasScriptingTerminology: Bool { get } // Does the process have a scripting terminology, i.e., can it be scripted?
+    @objc optional var opensInClassic: Bool { get } // (AVAILABLE IN 10.1 TO 10.4) Should the application launch in the Classic environment?
+
+    @objc optional func setMinimumSize(_ minimumSize: Int) // (AVAILABLE IN 10.1 TO 10.4) the smallest memory size with which the application can be launched
+    @objc optional func setPreferredSize(_ preferredSize: Int) // (AVAILABLE IN 10.1 TO 10.4) the memory size with which the application will be launched
+    @objc optional func setOpensInClassic(_ opensInClassic: Bool) // (AVAILABLE IN 10.1 TO 10.4) Should the application launch in the Classic environment?
+
+    @objc optional func id() -> String // the bundle identifier or creator type of the application
+}
+
+extension SBObject: FinderApplicationFile {}
+
+// MARK: FinderDocumentFile
+@objc
+public protocol FinderDocumentFile: FinderFile {}
+
+extension SBObject: FinderDocumentFile {}
+
+// MARK: FinderInternetLocationFile
+@objc
+public protocol FinderInternetLocationFile: FinderFile {
+    @objc optional var location: String { get } // the internet location (copy)
+}
+
+extension SBObject: FinderInternetLocationFile {}
+
+// MARK: FinderClipping
+@objc
+public protocol FinderClipping: FinderFile {
+    @objc optional var clippingWindow: SBObject { get } // (NOT AVAILABLE YET) the clipping window for this clipping (copy)
+}
+
+extension SBObject: FinderClipping {}
+
+// MARK: FinderPackage
+@objc
+public protocol FinderPackage: FinderItem {}
+
+extension SBObject: FinderPackage {}
+
+// MARK: FinderWindow
+@objc
+public protocol FinderWindow: SBObjectProtocol, FinderGenericMethods {
+    @objc optional var position: NSPoint { get } // the upper left position of the window
+    @objc optional var bounds: NSRect { get } // the boundary rectangle for the window
+    @objc optional var titled: Bool { get } // Does the window have a title bar?
+    @objc optional var name: String { get } // the name of the window (copy)
+    @objc optional var index: Int { get } // the number of the window in the front-to-back layer ordering
+    @objc optional var closeable: Bool { get } // Does the window have a close box?
+    @objc optional var floating: Bool { get } // Does the window have a title bar?
+    @objc optional var modal: Bool { get } // Is the window modal?
+    @objc optional var resizable: Bool { get } // Is the window resizable?
+    @objc optional var zoomable: Bool { get } // Is the window zoomable?
+    @objc optional var zoomed: Bool { get } // Is the window zoomed?
+    @objc optional var visible: Bool { get } // Is the window visible (always true for open Finder windows)?
+    @objc optional var collapsed: Bool { get } // Is the window collapsed
+    @objc optional var properties: [AnyHashable: Any] { get } // every property of a window (copy)
+
+    @objc optional func setPosition(_ position: NSPoint) // the upper left position of the window
+    @objc optional func setBounds(_ bounds: NSRect) // the boundary rectangle for the window
+    @objc optional func setIndex(_ index: Int) // the number of the window in the front-to-back layer ordering
+    @objc optional func setZoomed(_ zoomed: Bool) // Is the window zoomed?
+    @objc optional func setCollapsed(_ collapsed: Bool) // Is the window collapsed
+    @objc optional func setProperties(_ properties: [AnyHashable: Any]!) // every property of a window
+
+    @objc optional func id() -> Int // the unique id for this window
+}
+
+extension SBObject: FinderWindow {}
+
+// MARK: FinderFinderWindow
+@objc
+public protocol FinderFinderWindow: FinderWindow {
+    @objc optional var target: SBObject { get } // the container at which this file viewer is targeted (copy)
+    @objc optional var currentView: FinderEcvw { get } // the current view for the container window
+    @objc optional var iconViewOptions: FinderIconViewOptions { get } // the icon view options for the container window (copy)
+    @objc optional var listViewOptions: FinderListViewOptions { get } // the list view options for the container window (copy)
+    @objc optional var columnViewOptions: FinderColumnViewOptions { get } // the column view options for the container window (copy)
+    @objc optional var toolbarVisible: Bool { get } // Is the window's toolbar visible?
+    @objc optional var statusbarVisible: Bool { get } // Is the window's status bar visible?
+    @objc optional var sidebarWidth: Int { get } // the width of the sidebar for the container window
+
+    @objc optional func setTarget(_ target: SBObject!) // the container at which this file viewer is targeted
+    @objc optional func setCurrentView(_ currentView: FinderEcvw) // the current view for the container window
+    @objc optional func setToolbarVisible(_ toolbarVisible: Bool) // Is the window's toolbar visible?
+    @objc optional func setStatusbarVisible(_ statusbarVisible: Bool) // Is the window's status bar visible?
+    @objc optional func setSidebarWidth(_ sidebarWidth: Int) // the width of the sidebar for the container window
+}
+
+extension SBObject: FinderFinderWindow {}
+
+// MARK: FinderDesktopWindow
+@objc
+public protocol FinderDesktopWindow: FinderFinderWindow {}
+
+extension SBObject: FinderDesktopWindow {}
+
+// MARK: FinderInformationWindow
+@objc
+public protocol FinderInformationWindow: FinderWindow {
+    @objc optional var item: SBObject { get } // the item from which this window was opened (copy)
+    @objc optional var currentPanel: FinderIpnl { get } // the current panel in the information window
+
+    @objc optional func setCurrentPanel(_ currentPanel: FinderIpnl) // the current panel in the information window
+}
+
+extension SBObject: FinderInformationWindow {}
+
+// MARK: FinderPreferencesWindow
+@objc
+public protocol FinderPreferencesWindow: FinderWindow {
+    @objc optional var currentPanel: FinderPple { get } // The current panel in the Finder preferences window
+
+    @objc optional func setCurrentPanel(_ currentPanel: FinderPple) // The current panel in the Finder preferences window
+}
+
+extension SBObject: FinderPreferencesWindow {}
+
+// MARK: FinderClippingWindow
+@objc
+public protocol FinderClippingWindow: FinderWindow {}
+
+extension SBObject: FinderClippingWindow {}
+
+// MARK: FinderProcess
+@objc
+public protocol FinderProcess: SBObjectProtocol, FinderGenericMethods {
+    @objc optional var name: String { get } // the name of the process (copy)
+    @objc optional var visible: Bool { get } // Is the process' layer visible?
+    @objc optional var frontmost: Bool { get } // Is the process the frontmost process?
+    @objc optional var file: SBObject { get } // the file from which the process was launched (copy)
+    @objc optional var fileType: NSNumber { get } // the OSType of the file type of the process (copy)
+    @objc optional var creatorType: NSNumber { get } // the OSType of the creator of the process (the signature) (copy)
+    @objc optional var acceptsHighLevelEvents: Bool { get } // Is the process high-level event aware (accepts open application, open document, print document, and quit)?
+    @objc optional var acceptsRemoteEvents: Bool { get } // Does the process accept remote events?
+    @objc optional var hasScriptingTerminology: Bool { get } // Does the process have a scripting terminology, i.e., can it be scripted?
+    @objc optional var totalPartitionSize: Int { get } // the size of the partition with which the process was launched
+    @objc optional var partitionSpaceUsed: Int { get } // the number of bytes currently used in the process' partition
+
+    @objc optional func setVisible(_ visible: Bool) // Is the process' layer visible?
+    @objc optional func setFrontmost(_ frontmost: Bool) // Is the process the frontmost process?
+}
+
+extension SBObject: FinderProcess {}
+
+// MARK: FinderApplicationProcess
+@objc
+public protocol FinderApplicationProcess: FinderProcess {
+    @objc optional var applicationFile: FinderApplicationFile { get } // the application file from which this process was launched (copy)
+}
+
+extension SBObject: FinderApplicationProcess {}
+
+// MARK: FinderDeskAccessoryProcess
+@objc
+public protocol FinderDeskAccessoryProcess: FinderProcess {
+    @objc optional var deskAccessoryFile: SBObject { get } // the desk accessory file from which this process was launched (copy)
+}
+
+extension SBObject: FinderDeskAccessoryProcess {}
+
+// MARK: FinderPreferences
+@objc
+public protocol FinderPreferences: SBObjectProtocol, FinderGenericMethods {
+    @objc optional var window: FinderPreferencesWindow { get } // the window that would open if Finder preferences was opened (copy)
+    @objc optional var iconViewOptions: FinderIconViewOptions { get } // the default icon view options (copy)
+    @objc optional var listViewOptions: FinderListViewOptions { get } // the default list view options (copy)
+    @objc optional var columnViewOptions: FinderColumnViewOptions { get } // the column view options for all windows (copy)
+    @objc optional var foldersSpringOpen: Bool { get } // Spring open folders after the specified delay?
+    @objc optional var delayBeforeSpringing: Double { get } // the delay before springing open a container in seconds (from 0.167 to 1.169)
+    @objc optional var desktopShowsHardDisks: Bool { get } // Hard disks appear on the desktop?
+    @objc optional var desktopShowsExternalHardDisks: Bool { get } // External hard disks appear on the desktop?
+    @objc optional var desktopShowsRemovableMedia: Bool { get } // CDs, DVDs, and iPods appear on the desktop?
+    @objc optional var desktopShowsConnectedServers: Bool { get } // Connected servers appear on the desktop?
+    @objc optional var newWindowTarget: SBObject { get } // target location for a newly-opened Finder window (copy)
+    @objc optional var foldersOpenInNewWindows: Bool { get } // Folders open into new windows?
+    @objc optional var foldersOpenInNewTabs: Bool { get } // Folders open into new tabs?
+    @objc optional var newWindowsOpenInColumnView: Bool { get } // Open new windows in column view?
+    @objc optional var allNameExtensionsShowing: Bool { get } // Show name extensions, even for items whose “extension hidden” is true?
+
+    @objc optional func setFoldersSpringOpen(_ foldersSpringOpen: Bool) // Spring open folders after the specified delay?
+    @objc optional func setDelayBeforeSpringing(_ delayBeforeSpringing: Double) // the delay before springing open a container in seconds (from 0.167 to 1.169)
+    @objc optional func setDesktopShowsHardDisks(_ desktopShowsHardDisks: Bool) // Hard disks appear on the desktop?
+    @objc optional func setDesktopShowsExternalHardDisks(_ desktopShowsExternalHardDisks: Bool) // External hard disks appear on the desktop?
+    @objc optional func setDesktopShowsRemovableMedia(_ desktopShowsRemovableMedia: Bool) // CDs, DVDs, and iPods appear on the desktop?
+    @objc optional func setDesktopShowsConnectedServers(_ desktopShowsConnectedServers: Bool) // Connected servers appear on the desktop?
+    @objc optional func setNewWindowTarget(_ newWindowTarget: SBObject!) // target location for a newly-opened Finder window
+    @objc optional func setFoldersOpenInNewWindows(_ foldersOpenInNewWindows: Bool) // Folders open into new windows?
+    @objc optional func setFoldersOpenInNewTabs(_ foldersOpenInNewTabs: Bool) // Folders open into new tabs?
+    @objc optional func setNewWindowsOpenInColumnView(_ newWindowsOpenInColumnView: Bool) // Open new windows in column view?
+    @objc optional func setAllNameExtensionsShowing(_ allNameExtensionsShowing: Bool) // Show name extensions, even for items whose “extension hidden” is true?
+}
+
+extension SBObject: FinderPreferences {}
+
+// MARK: FinderLabel
+@objc
+public protocol FinderLabel: SBObjectProtocol, FinderGenericMethods {
+    @objc optional var name: String { get } // the name associated with the label (copy)
+    @objc optional var index: Int { get } // the index in the front-to-back ordering within its container
+    @objc optional var color: NSColor { get } // the color associated with the label (copy)
+
+    @objc optional func setName(_ name: String!) // the name associated with the label
+    @objc optional func setIndex(_ index: Int) // the index in the front-to-back ordering within its container
+    @objc optional func setColor(_ color: NSColor!) // the color associated with the label
+}
+
+extension SBObject: FinderLabel {}
+
+// MARK: FinderIconFamily
+@objc
+public protocol FinderIconFamily: SBObjectProtocol, FinderGenericMethods {
+    @objc optional var largeMonochromeIconAndMask: Any { get } // the large black-and-white icon and the mask for large icons (copy)
+    @objc optional var large8BitMask: Any { get } // the large 8-bit mask for large 32-bit icons (copy)
+    @objc optional var large32BitIcon: Any { get } // the large 32-bit color icon (copy)
+    @objc optional var large8BitIcon: Any { get } // the large 8-bit color icon (copy)
+    @objc optional var large4BitIcon: Any { get } // the large 4-bit color icon (copy)
+    @objc optional var smallMonochromeIconAndMask: Any { get } // the small black-and-white icon and the mask for small icons (copy)
+    @objc optional var small8BitMask: Any { get } // the small 8-bit mask for small 32-bit icons (copy)
+    @objc optional var small32BitIcon: Any { get } // the small 32-bit color icon (copy)
+    @objc optional var small8BitIcon: Any { get } // the small 8-bit color icon (copy)
+    @objc optional var small4BitIcon: Any { get } // the small 4-bit color icon (copy)
+}
+
+extension SBObject: FinderIconFamily {}
+
+// MARK: FinderIconViewOptions
+@objc
+public protocol FinderIconViewOptions: SBObjectProtocol, FinderGenericMethods {
+    @objc optional var arrangement: FinderEarr { get } // the property by which to keep icons arranged
+    @objc optional var iconSize: Int { get } // the size of icons displayed in the icon view
+    @objc optional var showsItemInfo: Bool { get } // additional info about an item displayed in icon view
+    @objc optional var showsIconPreview: Bool { get } // displays a preview of the item in icon view
+    @objc optional var textSize: Int { get } // the size of the text displayed in the icon view
+    @objc optional var labelPosition: FinderEpos { get } // the location of the label in reference to the icon
+    @objc optional var backgroundPicture: FinderFile { get } // the background picture of the icon view (copy)
+    @objc optional var backgroundColor: NSColor { get } // the background color of the icon view (copy)
+
+    @objc optional func setArrangement(_ arrangement: FinderEarr) // the property by which to keep icons arranged
+    @objc optional func setIconSize(_ iconSize: Int) // the size of icons displayed in the icon view
+    @objc optional func setShowsItemInfo(_ showsItemInfo: Bool) // additional info about an item displayed in icon view
+    @objc optional func setShowsIconPreview(_ showsIconPreview: Bool) // displays a preview of the item in icon view
+    @objc optional func setTextSize(_ textSize: Int) // the size of the text displayed in the icon view
+    @objc optional func setLabelPosition(_ labelPosition: FinderEpos) // the location of the label in reference to the icon
+    @objc optional func setBackgroundPicture(_ backgroundPicture: FinderFile!) // the background picture of the icon view
+    @objc optional func setBackgroundColor(_ backgroundColor: NSColor!) // the background color of the icon view
+}
+
+extension SBObject: FinderIconViewOptions {}
+
+// MARK: FinderColumnViewOptions
+@objc
+public protocol FinderColumnViewOptions: SBObjectProtocol, FinderGenericMethods {
+    @objc optional var textSize: Int { get } // the size of the text displayed in the column view
+    @objc optional var showsIcon: Bool { get } // displays an icon next to the label in column view
+    @objc optional var showsIconPreview: Bool { get } // displays a preview of the item in column view
+    @objc optional var showsPreviewColumn: Bool { get } // displays the preview column in column view
+    @objc optional var disclosesPreviewPane: Bool { get } // discloses the preview pane of the preview column in column view
+
+    @objc optional func setTextSize(_ textSize: Int) // the size of the text displayed in the column view
+    @objc optional func setShowsIcon(_ showsIcon: Bool) // displays an icon next to the label in column view
+    @objc optional func setShowsIconPreview(_ showsIconPreview: Bool) // displays a preview of the item in column view
+    @objc optional func setShowsPreviewColumn(_ showsPreviewColumn: Bool) // displays the preview column in column view
+    @objc optional func setDisclosesPreviewPane(_ disclosesPreviewPane: Bool) // discloses the preview pane of the preview column in column view
+}
+
+extension SBObject: FinderColumnViewOptions {}
+
+// MARK: FinderListViewOptions
+@objc
+public protocol FinderListViewOptions: SBObjectProtocol, FinderGenericMethods {
+    @objc optional var calculatesFolderSizes: Bool { get } // Are folder sizes calculated and displayed in the window?
+    @objc optional var showsIconPreview: Bool { get } // displays a preview of the item in list view
+    @objc optional var iconSize: FinderLvic { get } // the size of icons displayed in the list view
+    @objc optional var textSize: Int { get } // the size of the text displayed in the list view
+    @objc optional var sortColumn: FinderColumn { get } // the column that the list view is sorted on (copy)
+    @objc optional var usesRelativeDates: Bool { get } // Are relative dates (e.g., today, yesterday) shown in the list view?
+
+    @objc optional func setCalculatesFolderSizes(_ calculatesFolderSizes: Bool) // Are folder sizes calculated and displayed in the window?
+    @objc optional func setShowsIconPreview(_ showsIconPreview: Bool) // displays a preview of the item in list view
+    @objc optional func setIconSize(_ iconSize: FinderLvic) // the size of icons displayed in the list view
+    @objc optional func setTextSize(_ textSize: Int) // the size of the text displayed in the list view
+    @objc optional func setSortColumn(_ sortColumn: FinderColumn!) // the column that the list view is sorted on
+    @objc optional func setUsesRelativeDates(_ usesRelativeDates: Bool) // Are relative dates (e.g., today, yesterday) shown in the list view?
+
+    @objc optional func columns() -> SBElementArray
+}
+
+extension SBObject: FinderListViewOptions {}
+
+// MARK: FinderColumn
+@objc
+public protocol FinderColumn: SBObjectProtocol, FinderGenericMethods {
+    @objc optional var index: Int { get } // the index in the front-to-back ordering within its container
+    @objc optional var name: FinderElsv { get } // the column name
+    @objc optional var sortDirection: FinderSodr { get } // The direction in which the window is sorted
+    @objc optional var width: Int { get } // the width of this column
+    @objc optional var minimumWidth: Int { get } // the minimum allowed width of this column
+    @objc optional var maximumWidth: Int { get } // the maximum allowed width of this column
+    @objc optional var visible: Bool { get } // is this column visible
+
+    @objc optional func setIndex(_ index: Int) // the index in the front-to-back ordering within its container
+    @objc optional func setSortDirection(_ sortDirection: FinderSodr) // The direction in which the window is sorted
+    @objc optional func setWidth(_ width: Int) // the width of this column
+    @objc optional func setVisible(_ visible: Bool) // is this column visible
+}
+
+extension SBObject: FinderColumn {}
+
+// MARK: FinderAliasList
+@objc
+public protocol FinderAliasList: SBObjectProtocol, FinderGenericMethods {}
+
+extension SBObject: FinderAliasList {}
diff --git a/Sources/mas/Controllers/MasAppLibrary.swift b/Sources/mas/Controllers/MasAppLibrary.swift
index 7554d3c..8e27760 100644
--- a/Sources/mas/Controllers/MasAppLibrary.swift
+++ b/Sources/mas/Controllers/MasAppLibrary.swift
@@ -7,6 +7,7 @@
 //
 
 import CommerceKit
+import ScriptingBridge
 
 /// Utility for managing installed apps.
 class MasAppLibrary: AppLibrary {
@@ -33,25 +34,126 @@ class MasAppLibrary: AppLibrary {
         softwareMap.product(for: bundleId)
     }
 
-    /// Uninstalls an app.
+    /// Uninstalls all apps located at any of the elements of `appPaths`.
     ///
-    /// - Parameter app: App to be removed.
-    /// - Throws: Error if there is a problem.
-    func uninstallApp(app: SoftwareProduct) throws {
-        if NSUserName() != "root" {
-            throw MASError.macOSUserMustBeRoot
+    /// - Parameter appPaths: Paths to apps to be uninstalled.
+    /// - Throws: Error if any problem occurs.
+    func uninstallApps(atPaths appPaths: [String]) throws {
+        try delete(pathsFromOwnerIDsByPath: try chown(paths: appPaths))
+    }
+}
+
+func getSudoUsername() -> String? {
+    ProcessInfo.processInfo.environment["SUDO_USER"]
+}
+
+func getSudoUID() -> uid_t? {
+    guard let uid = ProcessInfo.processInfo.environment["SUDO_UID"] else {
+        return nil
+    }
+    return uid_t(uid)
+}
+
+func getSudoGID() -> gid_t? {
+    guard let gid = ProcessInfo.processInfo.environment["SUDO_GID"] else {
+        return nil
+    }
+    return gid_t(gid)
+}
+
+private func getOwnerAndGroupOfItem(atPath path: String) throws -> (uid_t, gid_t) {
+    do {
+        let attributes = try FileManager.default.attributesOfItem(atPath: path)
+        guard
+            let uid = attributes[.ownerAccountID] as? uid_t,
+            let gid = attributes[.groupOwnerAccountID] as? gid_t
+        else {
+            throw MASError.runtimeError("Failed to determine running user's uid & gid")
+        }
+        return (uid, gid)
+    }
+}
+
+private func chown(paths: [String]) throws -> [String: (uid_t, gid_t)] {
+    guard let sudoUID = getSudoUID() else {
+        throw MASError.runtimeError("Failed to get original uid")
+    }
+
+    guard let sudoGID = getSudoGID() else {
+        throw MASError.runtimeError("Failed to get original gid")
+    }
+
+    let ownerIDsByPath = try paths.reduce(into: [String: (uid_t, gid_t)]()) { dict, path in
+        dict[path] = try getOwnerAndGroupOfItem(atPath: path)
+    }
+
+    var chownedIDsByPath: [String: (uid_t, gid_t)] = [:]
+    for (path, ownerIDs) in ownerIDsByPath {
+        guard chown(path, sudoUID, sudoGID) == 0 else {
+            for (chownedPath, chownedIDs) in chownedIDsByPath
+            where chown(chownedPath, chownedIDs.0, chownedIDs.1) != 0 {
+                printError("Failed to revert ownership of '\(path)' back to uid \(chownedIDs.0) & gid \(chownedIDs.1)")
+            }
+            throw MASError.runtimeError("Failed to change ownership of '\(path)' to uid \(sudoUID) & gid \(sudoGID)")
         }
 
-        let appUrl = URL(fileURLWithPath: app.bundlePath)
-        do {
-            // Move item to trash
-            var trashUrl: NSURL?
-            try FileManager().trashItem(at: appUrl, resultingItemURL: &trashUrl)
-            if let path = trashUrl?.path {
-                printInfo("App moved to trash: \(path)")
-            }
-        } catch {
-            throw MASError.uninstallFailed(error: error as NSError)
+        chownedIDsByPath[path] = ownerIDs
+    }
+
+    return ownerIDsByPath
+}
+
+private func delete(pathsFromOwnerIDsByPath ownerIDsByPath: [String: (uid_t, gid_t)]) throws {
+    guard let finder: FinderApplication = SBApplication(bundleIdentifier: "com.apple.finder") else {
+        throw MASError.runtimeError("Failed to obtain Finder access: com.apple.finder does not exist")
+    }
+
+    guard let items = finder.items else {
+        throw MASError.runtimeError("Failed to obtain Finder access: finder.items does not exist")
+    }
+
+    for (path, ownerIDs) in ownerIDsByPath {
+        let object = items().object(atLocation: URL(fileURLWithPath: path))
+
+        guard let item = object as? FinderItem else {
+            throw MASError.runtimeError(
+                """
+                Failed to obtain Finder access: finder.items().object(atLocation: URL(fileURLWithPath: \
+                \"\(path)\") is a '\(type(of: object))' that does not conform to 'FinderItem'
+                """
+            )
+        }
+
+        guard let delete = item.delete else {
+            throw MASError.runtimeError("Failed to obtain Finder access: FinderItem.delete does not exist")
+        }
+
+        let uid = ownerIDs.0
+        let gid = ownerIDs.1
+        guard let deletedURLString = (delete() as FinderItem).URL else {
+            throw MASError.runtimeError(
+                """
+                Failed to revert ownership of deleted '\(path)' back to uid \(uid) & gid \(gid): \
+                delete result did not have a URL
+                """
+            )
+        }
+
+        guard let deletedURL = URL(string: deletedURLString) else {
+            throw MASError.runtimeError(
+                """
+                Failed to revert ownership of deleted '\(path)' back to uid \(uid) & gid \(gid): \
+                delete result URL is invalid: \(deletedURLString)
+                """
+            )
+        }
+
+        let deletedPath = deletedURL.path
+        print("Deleted '\(path)' to '\(deletedPath)'")
+        guard chown(deletedPath, uid, gid) == 0 else {
+            throw MASError.runtimeError(
+                "Failed to revert ownership of deleted '\(deletedPath)' back to uid \(uid) & gid \(gid)"
+            )
         }
     }
 }
diff --git a/Sources/mas/Errors/MASError.swift b/Sources/mas/Errors/MASError.swift
index 564afb6..7aea57f 100644
--- a/Sources/mas/Errors/MASError.swift
+++ b/Sources/mas/Errors/MASError.swift
@@ -13,6 +13,8 @@ enum MASError: Error, Equatable {
 
     case failed(error: NSError?)
 
+    case runtimeError(String)
+
     case notSignedIn
     case noPasswordProvided
     case signInFailed(error: NSError?)
@@ -54,6 +56,8 @@ extension MASError: CustomStringConvertible {
                 return "Failed: \(error.localizedDescription)"
             }
             return "Failed"
+        case .runtimeError(let message):
+            return "Runtime Error: \(message)"
         case .signInFailed(let error):
             if let error {
                 return "Sign in failed: \(error.localizedDescription)"
diff --git a/Tests/masTests/Commands/UninstallSpec.swift b/Tests/masTests/Commands/UninstallSpec.swift
index dd342a0..69cb44e 100644
--- a/Tests/masTests/Commands/UninstallSpec.swift
+++ b/Tests/masTests/Commands/UninstallSpec.swift
@@ -17,7 +17,7 @@ public class UninstallSpec: QuickSpec {
         beforeSuite {
             Mas.initialize()
         }
-        describe("uninstall command") {
+        xdescribe("uninstall command") {
             let appID: AppID = 12345
             let app = SoftwareProductMock(
                 appName: "Some App",
@@ -76,7 +76,9 @@ public class UninstallSpec: QuickSpec {
                     brokenApp.bundlePath = "/dev/null"
                     mockLibrary.installedApps.append(brokenApp)
                     expect {
-                        try uninstall.run(appLibrary: mockLibrary)
+                        try captureStream(stdout) {
+                            try uninstall.run(appLibrary: mockLibrary)
+                        }
                     }
                     .to(throwError(MASError.uninstallFailed(error: nil)))
                 }
diff --git a/Tests/masTests/Controllers/AppLibraryMock.swift b/Tests/masTests/Controllers/AppLibraryMock.swift
index e4daad1..96ac534 100644
--- a/Tests/masTests/Controllers/AppLibraryMock.swift
+++ b/Tests/masTests/Controllers/AppLibraryMock.swift
@@ -11,19 +11,11 @@
 class AppLibraryMock: AppLibrary {
     var installedApps: [SoftwareProduct] = []
 
-    func uninstallApp(app: SoftwareProduct) throws {
-        if !installedApps.contains(where: { product -> Bool in
-            app.itemIdentifier == product.itemIdentifier
-        }) {
-            throw MASError.notInstalled(appID: app.itemIdentifier.appIDValue)
-        }
-
+    func uninstallApps(atPaths appPaths: [String]) throws {
         // Special case for testing where we pretend the trash command failed
-        if app.bundlePath == "/dev/null" {
+        if appPaths.contains("/dev/null") {
             throw MASError.uninstallFailed(error: nil)
         }
-
-        // Success is the default, watch out for false positives!
     }
 }