App/Browser View/BrowserViewController.swift

@@ -795,7 +795,7 @@ extension BrowserViewController: UITextFieldDelegate
                 
                 currentTab.beginLoadingURL(url)
             } else {
-                let searchURL = Settings.shared.searchProvider.provider().searchURLWithQuery(text)
+                let searchURL = Settings.shared.currentSearchProvider().searchURLWithQuery(text)
                 currentTab.beginLoadingURL(searchURL)
             }
             

App/Settings/Amber/AmberSettingsView.swift

@@ -23,8 +23,8 @@ struct AmberSettingsView: View {
     @Environment(\.presentationMode)
         @Binding private var presentationMode
     
-    @State private var searchProvider = Settings.shared.searchProvider {
-        didSet { Settings.shared.searchProvider = searchProvider }
+    @State private var defaultSearchEngineName = Settings.shared.defaultSearchEngineName {
+        didSet { Settings.shared.defaultSearchEngineName = defaultSearchEngineName }
     }
     
     var body: some View {
@@ -35,12 +35,12 @@ struct AmberSettingsView: View {
                 })
                 
                 Section(header: Text("Search Provider"), content: {
-                    ForEach(Settings.SearchProviderSetting.allCases, id: \.self, content: { setting in
-                        Button(action: { searchProvider = setting }, label: {
+                    ForEach(Array(Settings.shared.searchEngines.keys).sorted(), id: \.self, content: { name in
+                        Button(action: { defaultSearchEngineName = name }, label: {
                             HStack {
-                                Text(setting.rawValue)
+                                Text(name)
                                 Spacer()
-                                if searchProvider == setting {
+                                if defaultSearchEngineName == name {
                                     Image(systemName: "checkmark")
                                 }
                             }

App/Settings/GeneralSettingsViewController.swift

@@ -113,11 +113,16 @@ class GeneralSettingsViewController: UIViewController
     typealias Item = String
     
     static let SearchProviderPopupItem = "searchProvider.popup"
+    static let SearchEngineNameFieldItem = "searchEngine.add.name"
+    static let SearchEngineURLFieldItem = "searchEngine.add.url"
     static let SyncServerItem = "syncServer.field"
     
     let dataSource: UICollectionViewDiffableDataSource<Section, Item>
     let collectionView: UICollectionView
     
+    private var pendingEngineName: String = ""
+    private var pendingEngineURL: String = ""
+    
     static func createLayout(forIdiom idiom: UIUserInterfaceIdiom) -> UICollectionViewLayout {
         #if targetEnvironment(macCatalyst)
             let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
@@ -180,20 +185,45 @@ class GeneralSettingsViewController: UIViewController
     
     init() {
         let actionHandler = { (action: UIAction) in
-            let providerString = action.title
-            let provider = Settings.SearchProviderSetting(rawValue: providerString)!
-            Settings.shared.searchProvider = provider
+            let engineName = action.title
+            Settings.shared.defaultSearchEngineName = engineName
         }
         
         let itemCellRegistry = UICollectionView.CellRegistration<UICollectionViewCell, Item> { cell, indexPath, identifier in
             if identifier == Self.SearchProviderPopupItem {
-                let menu = UIMenu(children: Settings.SearchProviderSetting.allCases.map { provider in
-                    let action = UIAction(title: provider.rawValue, handler: actionHandler)
-                    action.state = Settings.shared.searchProvider == provider ? .on : .off
+                let names = Settings.shared.searchEngines.keys.sorted()
+                let menu = UIMenu(children: names.map { name in
+                    let action = UIAction(title: name, handler: actionHandler)
+                    action.state = (Settings.shared.defaultSearchEngineName == name) ? .on : .off
                     return action
                 })
-                
                 cell.contentConfiguration = ButtonContentConfiguration(menu: menu)
+            } else if identifier == Self.SearchEngineNameFieldItem {
+                cell.contentConfiguration = TextFieldContentConfiguration(
+                    text: self.pendingEngineName,
+                    placeholderText: "Name (e.g., Startpage)",
+                    textChanged: { [weak self] newString in
+                        self?.pendingEngineName = newString
+                    },
+                    pressedReturn: { $0.resignFirstResponder() },
+                    keyboardType: .default,
+                    returnKeyType: .next
+                )
+            } else if identifier == Self.SearchEngineURLFieldItem {
+                cell.contentConfiguration = TextFieldContentConfiguration(
+                    text: self.pendingEngineURL,
+                    placeholderText: "URL template (use %q or %s)",
+                    textChanged: { [weak self] newString in
+                        self?.pendingEngineURL = newString
+                    },
+                    pressedReturn: { [weak self] textField in
+                        guard let self = self else { return }
+                        self.tryAddPendingSearchEngine()
+                        textField.resignFirstResponder()
+                    },
+                    keyboardType: .URL,
+                    returnKeyType: .done
+                )
             } else if identifier == Self.SyncServerItem {
                 cell.contentConfiguration = TextFieldContentConfiguration(
                     text: Settings.shared.syncServer ?? "",
@@ -248,14 +278,7 @@ class GeneralSettingsViewController: UIViewController
     
     override func viewDidLoad() {
         super.viewDidLoad()
-        
-        var snapshot = dataSource.snapshot()
-        snapshot.appendSections(Section.allCases)
-        // iOS
-        // snapshot.appendItems(Settings.SearchProviderSetting.allCases.map { $0.rawValue }, toSection: .searchEngine)
-        snapshot.appendItems([ Self.SearchProviderPopupItem ], toSection: .searchEngine)
-        snapshot.appendItems([ Self.SyncServerItem ], toSection: .syncServer)
-        dataSource.apply(snapshot, animatingDifferences: false)
+        applySnapshot(animatingDifferences: false)
     }
 
 }
@@ -265,3 +288,33 @@ extension GeneralSettingsViewController : UICollectionViewDelegate {
         false
     }
 }
+
+private extension GeneralSettingsViewController {
+    func applySnapshot(animatingDifferences: Bool) {
+        var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
+        snapshot.appendSections(Section.allCases)
+        snapshot.appendItems([ Self.SearchProviderPopupItem,
+                               Self.SearchEngineNameFieldItem,
+                               Self.SearchEngineURLFieldItem ], toSection: .searchEngine)
+        snapshot.appendItems([ Self.SyncServerItem ], toSection: .syncServer)
+        dataSource.apply(snapshot, animatingDifferences: animatingDifferences)
+    }
+    
+    func tryAddPendingSearchEngine() {
+        let name = pendingEngineName.trimmingCharacters(in: .whitespacesAndNewlines)
+        let url = pendingEngineURL.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !name.isEmpty, !url.isEmpty else { return }
+        // Require placeholder
+        guard url.contains("%q") || url.contains("%s") else { return }
+        
+        // Save
+        var engines = Settings.shared.searchEngines
+        engines[name] = url
+        Settings.shared.searchEngines = engines
+        
+        // Reset inputs and refresh UI
+        pendingEngineName = ""
+        pendingEngineURL = ""
+        applySnapshot(animatingDifferences: true)
+    }
+}

App/Settings/Settings.swift

@@ -75,25 +75,29 @@ class Settings
 {
     static let shared = Settings()
 
-    public enum SearchProviderSetting: String, CaseIterable {
-        case google         = "Google"
-        case duckduckgo     = "DuckDuckGo"
-        case searxnor       = "Searx.nor"
-        case whoogle        = "Whoogle.nor"
+    // Map of search engine name -> URL template containing %q or %s placeholder
+    // Defaults preserve the previous built-in engines
+    @SettingProperty(key: "searchEngines")
+    public var searchEngines: [String: String] = [
+        "Google":      "https://google.com/search?q=%q&gbv=1",
+        "DuckDuckGo":  "https://html.duckduckgo.com/html/?q=%q",
+        "Searx.nor":   "http://searx.nor/search?q=%q&categories=general",
+        "Whoogle.nor": "http://whoogle.nor/search?q=%q"
+    ]
 
-        func provider() -> SearchProvider {
-            switch self {
-                case .google:     return SearchProvider.google
-                case .duckduckgo: return SearchProvider.duckduckgo
-                case .searxnor:   return SearchProvider.searxnor
-                case .whoogle:    return SearchProvider.whoogle
-            }
+    // Name of the default search engine from `searchEngines`
+    @SettingProperty(key: "defaultSearchEngine")
+    public var defaultSearchEngineName: String = "Searx.nor"
+
+    // Convenience to build a SearchProvider from current default
+    func currentSearchProvider() -> SearchProvider {
+        if let template = searchEngines[defaultSearchEngineName] {
+            return SearchProvider.fromTemplate(template)
         }
+        // Fallback to Google if something goes wrong
+        return SearchProvider.fromTemplate("https://google.com/search?q=%q&gbv=1")
     }
     
-    @SettingProperty(key: "searchProvider")
-    public var searchProvider: SearchProviderSetting = .searxnor
-    
     @SettingProperty(key: "redirectRules")
     public var redirectRules: [String: String] = [:]
     

App/Web Search/SearchProvider.swift

@@ -9,6 +9,18 @@ import Foundation
 
 class SearchProvider
 {
+    // Build a provider from a URL template. Template should contain %q or %s
+    // which will be replaced with the sanitized query string.
+    static func fromTemplate(_ template: String) -> SearchProvider {
+        SearchProvider(resolver: { query in
+            let sanitized = query.sanitized()
+            let replaced = template
+                .replacingOccurrences(of: "%q", with: sanitized)
+                .replacingOccurrences(of: "%s", with: sanitized)
+            return URL(string: replaced) ?? URL(string: "https://google.com/search?q=\(sanitized)&gbv=1")!
+        })
+    }
+
     static let google = SearchProvider(resolver: { query in
         // gbv=1: no JS
         URL(string: "https://google.com/search?q=\(query.sanitized())&gbv=1")!