Append hint text to placeholder if input supports history

src/vs/base/browser/ui/findinput/findInput.ts

@@ -31,6 +31,7 @@ export interface IFindInputOptions extends IFindInputStyles {
 	readonly appendWholeWordsLabel?: string;
 	readonly appendRegexLabel?: string;
 	readonly history?: string[];
+	readonly showHistoryHint?: () => boolean;
 }
 
 export interface IFindInputStyles extends IInputBoxStyles {
@@ -150,6 +151,7 @@ export class FindInput extends Widget {
 			inputValidationErrorForeground: this.inputValidationErrorForeground,
 			inputValidationErrorBorder: this.inputValidationErrorBorder,
 			history,
+			showHistoryHint: options.showHistoryHint,
 			flexibleHeight,
 			flexibleWidth,
 			flexibleMaxHeight

src/vs/base/browser/ui/findinput/replaceInput.ts

@@ -30,6 +30,7 @@ export interface IReplaceInputOptions extends IReplaceInputStyles {
 
 	readonly appendPreserveCaseLabel?: string;
 	readonly history?: string[];
+	readonly showHistoryHint?: () => boolean;
 }
 
 export interface IReplaceInputStyles extends IInputBoxStyles {
@@ -157,6 +158,7 @@ export class ReplaceInput extends Widget {
 			inputValidationErrorForeground: this.inputValidationErrorForeground,
 			inputValidationErrorBorder: this.inputValidationErrorBorder,
 			history,
+			showHistoryHint: options.showHistoryHint,
 			flexibleHeight,
 			flexibleWidth,
 			flexibleMaxHeight

src/vs/base/browser/ui/inputbox/inputBox.ts

@@ -92,11 +92,11 @@ const defaultOpts = {
 export class InputBox extends Widget {
 	private contextViewProvider?: IContextViewProvider;
 	element: HTMLElement;
-	private input: HTMLInputElement;
+	protected input: HTMLInputElement;
 	private actionbar?: ActionBar;
 	private options: IInputOptions;
 	private message: IMessage | null;
-	private placeholder: string;
+	protected placeholder: string;
 	private tooltip: string;
 	private ariaLabel: string;
 	private validation?: IInputValidator;
@@ -634,15 +634,75 @@ export class InputBox extends Widget {
 
 export interface IHistoryInputOptions extends IInputOptions {
 	history: string[];
+	readonly showHistoryHint?: () => boolean;
 }
 
 export class HistoryInputBox extends InputBox implements IHistoryNavigationWidget {
 
 	private readonly history: HistoryNavigator<string>;
+	private observer: MutationObserver | undefined;
 
 	constructor(container: HTMLElement, contextViewProvider: IContextViewProvider | undefined, options: IHistoryInputOptions) {
+		const NLS_PLACEHOLDER_HISTORY_HINT = nls.localize({ key: 'history.inputbox.hint', comment: ['Text will be prefixed with \u21C5 plus a single space, then used as a hint where input field keeps history'] }, "for history");
+		const NLS_PLACEHOLDER_HISTORY_HINT_SUFFIX = ` or \u21C5 ${NLS_PLACEHOLDER_HISTORY_HINT}`;
+		const NLS_PLACEHOLDER_HISTORY_HINT_SUFFIX_IN_PARENS = ` (\u21C5 ${NLS_PLACEHOLDER_HISTORY_HINT})`;
 		super(container, contextViewProvider, options);
 		this.history = new HistoryNavigator<string>(options.history, 100);
+
+		// Function to append the history suffix to the placeholder if necessary
+		const addSuffix = () => {
+			if (options.showHistoryHint && options.showHistoryHint() && !this.placeholder.endsWith(NLS_PLACEHOLDER_HISTORY_HINT_SUFFIX) && !this.placeholder.endsWith(NLS_PLACEHOLDER_HISTORY_HINT_SUFFIX_IN_PARENS) && this.history.getHistory().length) {
+				const suffix = this.placeholder.endsWith(')') ? NLS_PLACEHOLDER_HISTORY_HINT_SUFFIX : NLS_PLACEHOLDER_HISTORY_HINT_SUFFIX_IN_PARENS;
+				const suffixedPlaceholder = this.placeholder + suffix;
+				if (options.showPlaceholderOnFocus && document.activeElement !== this.input) {
+					this.placeholder = suffixedPlaceholder;
+				}
+				else {
+					this.setPlaceHolder(suffixedPlaceholder);
+				}
+			}
+		};
+
+		// Spot the change to the textarea class attribute which occurs when it changes between non-empty and empty,
+		// and add the history suffix to the placeholder if not yet present
+		this.observer = new MutationObserver((mutationList: MutationRecord[], observer: MutationObserver) => {
+			mutationList.forEach((mutation: MutationRecord) => {
+				if (!mutation.target.textContent) {
+					addSuffix();
+				}
+			});
+		});
+		this.observer.observe(this.input, { attributeFilter: ['class'] });
+
+		this.onfocus(this.input, () => addSuffix());
+		this.onblur(this.input, () => {
+			const resetPlaceholder = (historyHint: string) => {
+				if (!this.placeholder.endsWith(historyHint)) {
+					return false;
+				}
+				else {
+					const revertedPlaceholder = this.placeholder.slice(0, this.placeholder.length - historyHint.length);
+					if (options.showPlaceholderOnFocus) {
+						this.placeholder = revertedPlaceholder;
+					}
+					else {
+						this.setPlaceHolder(revertedPlaceholder);
+					}
+					return true;
+				}
+			};
+			if (!resetPlaceholder(NLS_PLACEHOLDER_HISTORY_HINT_SUFFIX_IN_PARENS)) {
+				resetPlaceholder(NLS_PLACEHOLDER_HISTORY_HINT_SUFFIX);
+			}
+		});
+	}
+
+	override dispose() {
+		super.dispose();
+		if (this.observer) {
+			this.observer.disconnect();
+			this.observer = undefined;
+		}
 	}
 
 	public addToHistory(): void {

src/vs/workbench/contrib/debug/browser/repl.ts

@@ -492,8 +492,9 @@ export class Repl extends ViewPane implements IHistoryNavigationWidget {
 			return this.instantiationService.createInstance(SelectReplActionViewItem, action, session);
 		} else if (action.id === FILTER_ACTION_ID) {
 			const filterHistory = JSON.parse(this.storageService.get(FILTER_HISTORY_STORAGE_KEY, StorageScope.WORKSPACE, '[]')) as string[];
+			const showHistoryHint = () => { return this.keybindingService.lookupKeybinding('history.showPrevious')?.getElectronAccelerator() === 'Up' && this.keybindingService.lookupKeybinding('history.showNext')?.getElectronAccelerator() === 'Down'; };
 			this.filterActionViewItem = this.instantiationService.createInstance(ReplFilterActionViewItem, action,
-				localize({ key: 'workbench.debug.filter.placeholder', comment: ['Text in the brackets after e.g. is not localizable'] }, "Filter (e.g. text, !exclude)"), this.filterState, filterHistory);
+				localize({ key: 'workbench.debug.filter.placeholder', comment: ['Text in the brackets after e.g. is not localizable'] }, "Filter (e.g. text, !exclude)"), this.filterState, filterHistory, showHistoryHint);
 			return this.filterActionViewItem;
 		}
 

src/vs/workbench/contrib/debug/browser/replFilter.ts

@@ -138,6 +138,7 @@ export class ReplFilterActionViewItem extends BaseActionViewItem {
 		private placeholder: string,
 		private filters: ReplFilterState,
 		private history: string[],
+		private showHistoryHint: () => boolean,
 		@IInstantiationService private readonly instantiationService: IInstantiationService,
 		@IThemeService private readonly themeService: IThemeService,
 		@IContextViewService private readonly contextViewService: IContextViewService) {
@@ -188,7 +189,8 @@ export class ReplFilterActionViewItem extends BaseActionViewItem {
 	private createInput(container: HTMLElement): void {
 		this.filterInputBox = this._register(this.instantiationService.createInstance(ContextScopedHistoryInputBox, container, this.contextViewService, {
 			placeholder: this.placeholder,
-			history: this.history
+			history: this.history,
+			showHistoryHint: this.showHistoryHint
 		}));
 		this._register(attachInputBoxStyler(this.filterInputBox, this.themeService));
 		this.filterInputBox.value = this.filters.filterText;

src/vs/workbench/contrib/markers/browser/markersViewActions.ts

@@ -29,6 +29,7 @@ import { BaseActionViewItem, ActionViewItem } from 'vs/base/browser/ui/actionbar
 import { DropdownMenuActionViewItem } from 'vs/base/browser/ui/dropdown/dropdownActionViewItem';
 import { registerIcon } from 'vs/platform/theme/common/iconRegistry';
 import { IMarkersView } from 'vs/workbench/contrib/markers/browser/markers';
+import { IKeybindingService } from 'vs/platform/keybinding/common/keybinding';
 
 export interface IMarkersFiltersChangeEvent {
 	filterText?: boolean;
@@ -245,16 +246,19 @@ export class MarkersFilterActionViewItem extends BaseActionViewItem {
 	private focusContextKey: IContextKey<boolean>;
 	private readonly filtersAction: IAction;
 	private actionbar: ActionBar | null = null;
+	private keybindingService;
 
 	constructor(
 		action: IAction,
 		private markersView: IMarkersView,
 		@IInstantiationService private readonly instantiationService: IInstantiationService,
 		@IContextViewService private readonly contextViewService: IContextViewService,
 		@IThemeService private readonly themeService: IThemeService,
-		@IContextKeyService contextKeyService: IContextKeyService
+		@IContextKeyService contextKeyService: IContextKeyService,
+		@IKeybindingService keybindingService: IKeybindingService
 	) {
 		super(null, action);
+		this.keybindingService = keybindingService;
 		this.focusContextKey = Constants.MarkerViewFilterFocusContextKey.bindTo(contextKeyService);
 		this.delayedFilterUpdate = new Delayer<void>(400);
 		this._register(toDisposable(() => this.delayedFilterUpdate.cancel()));
@@ -316,10 +320,12 @@ export class MarkersFilterActionViewItem extends BaseActionViewItem {
 	}
 
 	private createInput(container: HTMLElement): void {
+		const showHistoryHint = () => { return this.keybindingService.lookupKeybinding('history.showPrevious')?.getElectronAccelerator() === 'Up' && this.keybindingService.lookupKeybinding('history.showNext')?.getElectronAccelerator() === 'Down'; };
 		this.filterInputBox = this._register(this.instantiationService.createInstance(ContextScopedHistoryInputBox, container, this.contextViewService, {
 			placeholder: Messages.MARKERS_PANEL_FILTER_PLACEHOLDER,
 			ariaLabel: Messages.MARKERS_PANEL_FILTER_ARIA_LABEL,
-			history: this.markersView.filters.filterHistory
+			history: this.markersView.filters.filterHistory,
+			showHistoryHint
 		}));
 		this._register(attachInputBoxStyler(this.filterInputBox, this.themeService));
 		this.filterInputBox.value = this.markersView.filters.filterText;

src/vs/workbench/contrib/preferences/browser/keybindingWidgets.ts

@@ -54,12 +54,12 @@ export class KeybindingsSearchWidget extends SearchWidget {
 
 	constructor(parent: HTMLElement, options: KeybindingsSearchOptions,
 		@IContextViewService contextViewService: IContextViewService,
-		@IKeybindingService private readonly keybindingService: IKeybindingService,
 		@IInstantiationService instantiationService: IInstantiationService,
 		@IThemeService themeService: IThemeService,
-		@IContextKeyService contextKeyService: IContextKeyService
+		@IContextKeyService contextKeyService: IContextKeyService,
+		@IKeybindingService keybindingService: IKeybindingService,
 	) {
-		super(parent, options, contextViewService, instantiationService, themeService, contextKeyService);
+		super(parent, options, contextViewService, instantiationService, themeService, contextKeyService, keybindingService);
 		this._register(attachInputBoxStyler(this.inputBox, themeService));
 		this._register(toDisposable(() => this.stopRecordingKeys()));
 		this._firstPart = null;

src/vs/workbench/contrib/preferences/browser/preferencesWidgets.ts

@@ -26,6 +26,7 @@ import { ConfigurationTarget } from 'vs/platform/configuration/common/configurat
 import { IContextKey, IContextKeyService } from 'vs/platform/contextkey/common/contextkey';
 import { IContextMenuService, IContextViewService } from 'vs/platform/contextview/browser/contextView';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
+import { IKeybindingService } from 'vs/platform/keybinding/common/keybinding';
 import { ILabelService } from 'vs/platform/label/common/label';
 import { activeContrastBorder, badgeBackground, badgeForeground, contrastBorder, focusBorder } from 'vs/platform/theme/common/colorRegistry';
 import { attachInputBoxStyler, attachStylerCallback } from 'vs/platform/theme/common/styler';
@@ -370,7 +371,8 @@ export class SearchWidget extends Widget {
 		@IContextViewService private readonly contextViewService: IContextViewService,
 		@IInstantiationService protected instantiationService: IInstantiationService,
 		@IThemeService private readonly themeService: IThemeService,
-		@IContextKeyService private readonly contextKeyService: IContextKeyService
+		@IContextKeyService private readonly contextKeyService: IContextKeyService,
+		@IKeybindingService protected readonly keybindingService: IKeybindingService
 	) {
 		super();
 		this.create(parent);
@@ -420,7 +422,8 @@ export class SearchWidget extends Widget {
 	}
 
 	protected createInputBox(parent: HTMLElement): HistoryInputBox {
-		const box = this._register(new ContextScopedHistoryInputBox(parent, this.contextViewService, this.options, this.contextKeyService));
+		const showHistoryHint = () => { return this.keybindingService.lookupKeybinding('history.showPrevious')?.getElectronAccelerator() === 'Up' && this.keybindingService.lookupKeybinding('history.showNext')?.getElectronAccelerator() === 'Down'; };
+		const box = this._register(new ContextScopedHistoryInputBox(parent, this.contextViewService, { ...this.options, showHistoryHint }, this.contextKeyService));
 		this._register(attachInputBoxStyler(box, this.themeService));
 
 		return box;

src/vs/workbench/contrib/search/browser/patternInputWidget.ts

@@ -17,6 +17,7 @@ import * as nls from 'vs/nls';
 import { ContextScopedHistoryInputBox } from 'vs/platform/browser/contextScopedHistoryWidget';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
 import { IContextKeyService } from 'vs/platform/contextkey/common/contextkey';
+import { IKeybindingService } from 'vs/platform/keybinding/common/keybinding';
 import { attachCheckboxStyler, attachInputBoxStyler } from 'vs/platform/theme/common/styler';
 import { IThemeService } from 'vs/platform/theme/common/themeService';
 
@@ -49,7 +50,8 @@ export class PatternInputWidget extends Widget implements IThemable {
 	constructor(parent: HTMLElement, private contextViewProvider: IContextViewProvider, options: IOptions = Object.create(null),
 		@IThemeService protected themeService: IThemeService,
 		@IContextKeyService private readonly contextKeyService: IContextKeyService,
-		@IConfigurationService protected readonly configurationService: IConfigurationService
+		@IConfigurationService protected readonly configurationService: IConfigurationService,
+		@IKeybindingService private readonly keybindingService: IKeybindingService,
 	) {
 		super();
 		options = {
@@ -143,6 +145,7 @@ export class PatternInputWidget extends Widget implements IThemable {
 		this.domNode.style.width = this.width + 'px';
 		this.domNode.classList.add('monaco-findInput');
 
+		const showHistoryHint = () => { return this.keybindingService.lookupKeybinding('history.showPrevious')?.getElectronAccelerator() === 'Up' && this.keybindingService.lookupKeybinding('history.showNext')?.getElectronAccelerator() === 'Down'; };
 		this.inputBox = new ContextScopedHistoryInputBox(this.domNode, this.contextViewProvider, {
 			placeholder: options.placeholder,
 			showPlaceholderOnFocus: options.showPlaceholderOnFocus,
@@ -151,7 +154,8 @@ export class PatternInputWidget extends Widget implements IThemable {
 			validationOptions: {
 				validation: undefined
 			},
-			history: options.history || []
+			history: options.history || [],
+			showHistoryHint
 		}, this.contextKeyService);
 		this._register(attachInputBoxStyler(this.inputBox, this.themeService));
 		this._register(this.inputBox.onDidChange(() => this._onSubmit.fire(true)));
@@ -192,8 +196,9 @@ export class IncludePatternInputWidget extends PatternInputWidget {
 		@IThemeService themeService: IThemeService,
 		@IContextKeyService contextKeyService: IContextKeyService,
 		@IConfigurationService configurationService: IConfigurationService,
+		@IKeybindingService keybindingService: IKeybindingService,
 	) {
-		super(parent, contextViewProvider, options, themeService, contextKeyService, configurationService);
+		super(parent, contextViewProvider, options, themeService, contextKeyService, configurationService, keybindingService);
 	}
 
 	private useSearchInEditorsBox!: Checkbox;
@@ -243,8 +248,9 @@ export class ExcludePatternInputWidget extends PatternInputWidget {
 		@IThemeService themeService: IThemeService,
 		@IContextKeyService contextKeyService: IContextKeyService,
 		@IConfigurationService configurationService: IConfigurationService,
+		@IKeybindingService keybindingService: IKeybindingService,
 	) {
-		super(parent, contextViewProvider, options, themeService, contextKeyService, configurationService);
+		super(parent, contextViewProvider, options, themeService, contextKeyService, configurationService, keybindingService);
 	}
 
 	private useExcludesAndIgnoreFilesBox!: Checkbox;

src/vs/workbench/contrib/search/browser/searchView.ts

@@ -320,7 +320,7 @@ export class SearchView extends ViewPane {
 
 		this.inputPatternIncludes = this._register(this.instantiationService.createInstance(IncludePatternInputWidget, folderIncludesList, this.contextViewService, {
 			ariaLabel: filesToIncludeTitle,
-			placeholder: nls.localize('placeholder.includes', "(e.g. *.ts, src/**/include)"),
+			placeholder: nls.localize('placeholder.includes', "e.g. *.ts, src/**/include"),
 			showPlaceholderOnFocus: true,
 			history: patternIncludesHistory,
 		}));
@@ -339,7 +339,7 @@ export class SearchView extends ViewPane {
 		dom.append(excludesList, $('h4', undefined, excludesTitle));
 		this.inputPatternExcludes = this._register(this.instantiationService.createInstance(ExcludePatternInputWidget, excludesList, this.contextViewService, {
 			ariaLabel: excludesTitle,
-			placeholder: nls.localize('placeholder.excludes', "(e.g. *.ts, src/**/exclude)"),
+			placeholder: nls.localize('placeholder.excludes', "e.g. *.ts, src/**/exclude"),
 			showPlaceholderOnFocus: true,
 			history: patternExclusionsHistory,
 		}));

src/vs/workbench/contrib/search/browser/searchWidget.ts

@@ -235,6 +235,7 @@ export class SearchWidget extends Widget {
 
 	clearHistory(): void {
 		this.searchInput.inputBox.clearHistory();
+		this.replaceInput.inputBox.clearHistory();
 	}
 
 	showNextSearchTerm() {
@@ -302,6 +303,7 @@ export class SearchWidget extends Widget {
 	}
 
 	private renderSearchInput(parent: HTMLElement, options: ISearchWidgetOptions): void {
+		const showHistoryHint = () => { return this.keyBindingService.lookupKeybinding('history.showPrevious')?.getElectronAccelerator() === 'Up' && this.keyBindingService.lookupKeybinding('history.showNext')?.getElectronAccelerator() === 'Down'; };
 		const inputOptions: IFindInputOptions = {
 			label: nls.localize('label.Search', 'Search: Type Search Term and press Enter to search'),
 			validation: (value: string) => this.validateSearchInput(value),
@@ -310,6 +312,7 @@ export class SearchWidget extends Widget {
 			appendWholeWordsLabel: appendKeyBindingLabel('', this.keyBindingService.lookupKeybinding(Constants.ToggleWholeWordCommandId), this.keyBindingService),
 			appendRegexLabel: appendKeyBindingLabel('', this.keyBindingService.lookupKeybinding(Constants.ToggleRegexCommandId), this.keyBindingService),
 			history: options.searchHistory,
+			showHistoryHint,
 			flexibleHeight: true,
 			flexibleMaxHeight: SearchWidget.INPUT_MAX_HEIGHT
 		};
@@ -392,12 +395,14 @@ export class SearchWidget extends Widget {
 	private renderReplaceInput(parent: HTMLElement, options: ISearchWidgetOptions): void {
 		this.replaceContainer = dom.append(parent, dom.$('.replace-container.disabled'));
 		const replaceBox = dom.append(this.replaceContainer, dom.$('.replace-input'));
+		const showHistoryHint = () => { return this.keyBindingService.lookupKeybinding('history.showPrevious')?.getElectronAccelerator() === 'Up' && this.keyBindingService.lookupKeybinding('history.showNext')?.getElectronAccelerator() === 'Down'; };
 
 		this.replaceInput = this._register(new ContextScopedReplaceInput(replaceBox, this.contextViewService, {
 			label: nls.localize('label.Replace', 'Replace: Type replace term and press Enter to preview'),
 			placeholder: nls.localize('search.replace.placeHolder', "Replace"),
 			appendPreserveCaseLabel: appendKeyBindingLabel('', this.keyBindingService.lookupKeybinding(Constants.TogglePreserveCaseId), this.keyBindingService),
 			history: options.replaceHistory,
+			showHistoryHint,
 			flexibleHeight: true,
 			flexibleMaxHeight: SearchWidget.INPUT_MAX_HEIGHT
 		}, this.contextKeyService, true));

src/vs/workbench/contrib/testing/browser/testingExplorerFilter.ts

@@ -89,7 +89,7 @@ export class TestingExplorerFilter extends BaseActionViewItem {
 				value: this.state.text.value,
 				placeholderText: localize('testExplorerFilter', "Filter (e.g. text, !exclude, @tag)"),
 			},
-			history: this.history.get([]),
+			history: this.history.get([])
 		}));
 		this._register(attachSuggestEnabledInputBoxStyler(input, this.themeService));