editorStatus.ts

/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

'use strict';

import 'vs/css!./media/editorstatus';
import nls = require('vs/nls');
import { TPromise } from 'vs/base/common/winjs.base';
import { $, append, runAtThisOrScheduleAtNextAnimationFrame, addDisposableListener } from 'vs/base/browser/dom';
import strings = require('vs/base/common/strings');
import paths = require('vs/base/common/paths');
import types = require('vs/base/common/types');
import uri from 'vs/base/common/uri';
import errors = require('vs/base/common/errors');
import { IStatusbarItem } from 'vs/workbench/browser/parts/statusbar/statusbar';
import { Action } from 'vs/base/common/actions';
import { language, LANGUAGE_DEFAULT, AccessibilitySupport } from 'vs/base/common/platform';
import * as browser from 'vs/base/browser/browser';
import { IMode } from 'vs/editor/common/modes';
import { UntitledEditorInput } from 'vs/workbench/common/editor/untitledEditorInput';
import { IFileEditorInput, EncodingMode, IEncodingSupport, toResource, SideBySideEditorInput } from 'vs/workbench/common/editor';
import { IDisposable, combinedDisposable, dispose } from 'vs/base/common/lifecycle';
import { IUntitledEditorService } from 'vs/workbench/services/untitled/common/untitledEditorService';
import { IEditorAction, ICommonCodeEditor, EndOfLineSequence, IModel } from 'vs/editor/common/editorCommon';
import { IModelLanguageChangedEvent, IModelOptionsChangedEvent } from 'vs/editor/common/model/textModelEvents';
import { TrimTrailingWhitespaceAction } from 'vs/editor/contrib/linesOperations/common/linesOperations';
import { IndentUsingSpaces, IndentUsingTabs, DetectIndentation, IndentationToSpacesAction, IndentationToTabsAction } from 'vs/editor/contrib/indentation/common/indentation';
import { BaseBinaryResourceEditor } from 'vs/workbench/browser/parts/editor/binaryEditor';
import { BinaryResourceDiffEditor } from 'vs/workbench/browser/parts/editor/binaryDiffEditor';
import { IEditor as IBaseEditor, IEditorInput } from 'vs/platform/editor/common/editor';
import { IWorkbenchEditorService } from 'vs/workbench/services/editor/common/editorService';
import { IQuickOpenService, IPickOpenEntry, IFilePickOpenEntry } from 'vs/platform/quickOpen/common/quickOpen';
import { IWorkspaceConfigurationService } from 'vs/workbench/services/configuration/common/configuration';
import { SUPPORTED_ENCODINGS, IFileService, IFilesConfiguration, FILES_ASSOCIATIONS_CONFIG } from 'vs/platform/files/common/files';
import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
import { IModeService } from 'vs/editor/common/services/modeService';
import { IModelService } from 'vs/editor/common/services/modelService';
import { Selection } from 'vs/editor/common/core/selection';
import { IEditorGroupService } from 'vs/workbench/services/group/common/groupService';
import { TabFocus } from 'vs/editor/common/config/commonEditorConfig';
import { ICommandService } from 'vs/platform/commands/common/commands';
import { IExtensionGalleryService } from 'vs/platform/extensionManagement/common/extensionManagement';
import { ITextFileService } from 'vs/workbench/services/textfile/common/textfiles';
import { getCodeEditor as getEditorWidget, getCodeOrDiffEditor } from 'vs/editor/common/services/codeEditorService';
import { ICursorPositionChangedEvent } from 'vs/editor/common/controller/cursorEvents';
import { IConfigurationChangedEvent, IEditorOptions } from 'vs/editor/common/config/editorOptions';
import { ITextResourceConfigurationService } from 'vs/editor/common/services/resourceConfiguration';
import { IThemeService } from 'vs/platform/theme/common/themeService';
import { IContextViewService } from 'vs/platform/contextview/browser/contextView';
import { attachStylerCallback } from 'vs/platform/theme/common/styler';
import { widgetShadow, editorWidgetBackground } from 'vs/platform/theme/common/colorRegistry';

// TODO@Sandeep layer breaker
// tslint:disable-next-line:import-patterns
import { IPreferencesService } from 'vs/workbench/parts/preferences/common/preferences';
import { ConfigurationTarget } from 'vs/platform/configuration/common/configuration';

function toEditorWithEncodingSupport(input: IEditorInput): IEncodingSupport {
	if (input instanceof SideBySideEditorInput) {
		input = input.master;
	}

	if (input instanceof UntitledEditorInput) {
		return input;
	}

	let encodingSupport = input as IFileEditorInput;
	if (types.areFunctions(encodingSupport.setEncoding, encodingSupport.getEncoding)) {
		return encodingSupport;
	}

	return null;
}

interface IEditorSelectionStatus {
	selections?: Selection[];
	charactersSelected?: number;
}

class StateChange {
	_stateChangeBrand: void;

	indentation: boolean;
	selectionStatus: boolean;
	mode: boolean;
	encoding: boolean;
	EOL: boolean;
	tabFocusMode: boolean;
	screenReaderMode: boolean;
	metadata: boolean;

	constructor() {
		this.indentation = false;
		this.selectionStatus = false;
		this.mode = false;
		this.encoding = false;
		this.EOL = false;
		this.tabFocusMode = false;
		this.screenReaderMode = false;
		this.metadata = false;
	}

	public combine(other: StateChange) {
		this.indentation = this.indentation || other.indentation;
		this.selectionStatus = this.selectionStatus || other.selectionStatus;
		this.mode = this.mode || other.mode;
		this.encoding = this.encoding || other.encoding;
		this.EOL = this.EOL || other.EOL;
		this.tabFocusMode = this.tabFocusMode || other.tabFocusMode;
		this.screenReaderMode = this.screenReaderMode || other.screenReaderMode;
		this.metadata = this.metadata || other.metadata;
	}
}

interface StateDelta {
	selectionStatus?: string;
	mode?: string;
	encoding?: string;
	EOL?: string;
	indentation?: string;
	tabFocusMode?: boolean;
	screenReaderMode?: boolean;
	metadata?: string;
}

class State {
	private _selectionStatus: string;
	public get selectionStatus(): string { return this._selectionStatus; }

	private _mode: string;
	public get mode(): string { return this._mode; }

	private _encoding: string;
	public get encoding(): string { return this._encoding; }

	private _EOL: string;
	public get EOL(): string { return this._EOL; }

	private _indentation: string;
	public get indentation(): string { return this._indentation; }

	private _tabFocusMode: boolean;
	public get tabFocusMode(): boolean { return this._tabFocusMode; }

	private _screenReaderMode: boolean;
	public get screenReaderMode(): boolean { return this._screenReaderMode; }

	private _metadata: string;
	public get metadata(): string { return this._metadata; }

	constructor() {
		this._selectionStatus = null;
		this._mode = null;
		this._encoding = null;
		this._EOL = null;
		this._tabFocusMode = false;
		this._screenReaderMode = false;
		this._metadata = null;
	}

	public update(update: StateDelta): StateChange {
		const e = new StateChange();
		let somethingChanged = false;

		if (typeof update.selectionStatus !== 'undefined') {
			if (this._selectionStatus !== update.selectionStatus) {
				this._selectionStatus = update.selectionStatus;
				somethingChanged = true;
				e.selectionStatus = true;
			}
		}
		if (typeof update.indentation !== 'undefined') {
			if (this._indentation !== update.indentation) {
				this._indentation = update.indentation;
				somethingChanged = true;
				e.indentation = true;
			}
		}
		if (typeof update.mode !== 'undefined') {
			if (this._mode !== update.mode) {
				this._mode = update.mode;
				somethingChanged = true;
				e.mode = true;
			}
		}
		if (typeof update.encoding !== 'undefined') {
			if (this._encoding !== update.encoding) {
				this._encoding = update.encoding;
				somethingChanged = true;
				e.encoding = true;
			}
		}
		if (typeof update.EOL !== 'undefined') {
			if (this._EOL !== update.EOL) {
				this._EOL = update.EOL;
				somethingChanged = true;
				e.EOL = true;
			}
		}
		if (typeof update.tabFocusMode !== 'undefined') {
			if (this._tabFocusMode !== update.tabFocusMode) {
				this._tabFocusMode = update.tabFocusMode;
				somethingChanged = true;
				e.tabFocusMode = true;
			}
		}
		if (typeof update.screenReaderMode !== 'undefined') {
			if (this._screenReaderMode !== update.screenReaderMode) {
				this._screenReaderMode = update.screenReaderMode;
				somethingChanged = true;
				e.screenReaderMode = true;
			}
		}
		if (typeof update.metadata !== 'undefined') {
			if (this._metadata !== update.metadata) {
				this._metadata = update.metadata;
				somethingChanged = true;
				e.metadata = true;
			}
		}

		if (somethingChanged) {
			return e;
		}
		return null;
	}
}

const nlsSingleSelectionRange = nls.localize('singleSelectionRange', "Ln {0}, Col {1} ({2} selected)");
const nlsSingleSelection = nls.localize('singleSelection', "Ln {0}, Col {1}");
const nlsMultiSelectionRange = nls.localize('multiSelectionRange', "{0} selections ({1} characters selected)");
const nlsMultiSelection = nls.localize('multiSelection', "{0} selections");
const nlsEOLLF = nls.localize('endOfLineLineFeed', "LF");
const nlsEOLCRLF = nls.localize('endOfLineCarriageReturnLineFeed', "CRLF");
const nlsTabFocusMode = nls.localize('tabFocusModeEnabled', "Tab Moves Focus");
const nlsScreenReaderDetected = nls.localize('screenReaderDetected', "Screen Reader Optimized");
const nlsScreenReaderDetectedTitle = nls.localize('screenReaderDetectedExtra', "If you are not using a Screen Reader, please change the setting `editor.accessibilitySupport` to \"off\".");

function _setDisplay(el: HTMLElement, desiredValue: string): void {
	if (el.style.display !== desiredValue) {
		el.style.display = desiredValue;
	}
}
function show(el: HTMLElement): void {
	_setDisplay(el, '');
}
function hide(el: HTMLElement): void {
	_setDisplay(el, 'none');
}

export class EditorStatus implements IStatusbarItem {

	private state: State;
	private element: HTMLElement;
	private tabFocusModeElement: HTMLElement;
	private screenRedearModeElement: HTMLElement;
	private indentationElement: HTMLElement;
	private selectionElement: HTMLElement;
	private encodingElement: HTMLElement;
	private eolElement: HTMLElement;
	private modeElement: HTMLElement;
	private metadataElement: HTMLElement;
	private toDispose: IDisposable[];
	private activeEditorListeners: IDisposable[];
	private delayedRender: IDisposable;
	private toRender: StateChange;
	private lastScreenReaderExplanation: ScreenReaderDetectedExplanation;

	constructor(
		@IWorkbenchEditorService private editorService: IWorkbenchEditorService,
		@IEditorGroupService private editorGroupService: IEditorGroupService,
		@IQuickOpenService private quickOpenService: IQuickOpenService,
		@IInstantiationService private instantiationService: IInstantiationService,
		@IUntitledEditorService private untitledEditorService: IUntitledEditorService,
		@IModeService private modeService: IModeService,
		@ITextFileService private textFileService: ITextFileService,
		@IWorkspaceConfigurationService private readonly configurationService: IWorkspaceConfigurationService,
	) {
		this.toDispose = [];
		this.activeEditorListeners = [];
		this.state = new State();
		this.lastScreenReaderExplanation = null;
	}

	public render(container: HTMLElement): IDisposable {
		this.element = append(container, $('.editor-statusbar-item'));

		this.tabFocusModeElement = append(this.element, $('a.editor-status-tabfocusmode.status-bar-info'));
		this.tabFocusModeElement.title = nls.localize('disableTabMode', "Disable Accessibility Mode");
		this.tabFocusModeElement.onclick = () => this.onTabFocusModeClick();
		this.tabFocusModeElement.textContent = nlsTabFocusMode;
		hide(this.tabFocusModeElement);

		this.screenRedearModeElement = append(this.element, $('a.editor-status-screenreadermode.status-bar-info'));
		this.screenRedearModeElement.textContent = nlsScreenReaderDetected;
		this.screenRedearModeElement.title = nlsScreenReaderDetectedTitle;
		this.screenRedearModeElement.onclick = () => this.onScreenReaderModeClick();
		hide(this.screenRedearModeElement);

		this.selectionElement = append(this.element, $('a.editor-status-selection'));
		this.selectionElement.title = nls.localize('gotoLine', "Go to Line");
		this.selectionElement.onclick = () => this.onSelectionClick();
		hide(this.selectionElement);

		this.indentationElement = append(this.element, $('a.editor-status-indentation'));
		this.indentationElement.title = nls.localize('indentation', "Indentation");
		this.indentationElement.onclick = () => this.onIndentationClick();
		hide(this.indentationElement);

		this.encodingElement = append(this.element, $('a.editor-status-encoding'));
		this.encodingElement.title = nls.localize('selectEncoding', "Select Encoding");
		this.encodingElement.onclick = () => this.onEncodingClick();
		hide(this.encodingElement);

		this.eolElement = append(this.element, $('a.editor-status-eol'));
		this.eolElement.title = nls.localize('selectEOL', "Select End of Line Sequence");
		this.eolElement.onclick = () => this.onEOLClick();
		hide(this.eolElement);

		this.modeElement = append(this.element, $('a.editor-status-mode'));
		this.modeElement.title = nls.localize('selectLanguageMode', "Select Language Mode");
		this.modeElement.onclick = () => this.onModeClick();
		hide(this.modeElement);

		this.metadataElement = append(this.element, $('span.editor-status-metadata'));
		this.metadataElement.title = nls.localize('fileInfo', "File Information");
		hide(this.metadataElement);

		this.delayedRender = null;
		this.toRender = null;

		this.toDispose.push(
			{
				dispose: () => {
					if (this.delayedRender) {
						this.delayedRender.dispose();
						this.delayedRender = null;
					}
				}
			},
			this.editorGroupService.onEditorsChanged(() => this.onEditorsChanged()),
			this.untitledEditorService.onDidChangeEncoding(r => this.onResourceEncodingChange(r)),
			this.textFileService.models.onModelEncodingChanged(e => this.onResourceEncodingChange(e.resource)),
			TabFocus.onDidChangeTabFocus(e => this.onTabFocusModeChange()),
		);

		return combinedDisposable(this.toDispose);
	}

	private updateState(update: StateDelta): void {
		const changed = this.state.update(update);
		if (!changed) {
			// Nothing really changed
			return;
		}

		if (!this.toRender) {
			this.toRender = changed;
			this.delayedRender = runAtThisOrScheduleAtNextAnimationFrame(() => {
				this.delayedRender = null;
				const toRender = this.toRender;
				this.toRender = null;
				this._renderNow(toRender);
			});
		} else {
			this.toRender.combine(changed);
		}
	}

	private _renderNow(changed: StateChange): void {
		if (changed.tabFocusMode) {
			if (this.state.tabFocusMode && this.state.tabFocusMode === true) {
				show(this.tabFocusModeElement);
			} else {
				hide(this.tabFocusModeElement);
			}
		}

		if (changed.screenReaderMode) {
			if (this.state.screenReaderMode && this.state.screenReaderMode === true) {
				show(this.screenRedearModeElement);
			} else {
				hide(this.screenRedearModeElement);
			}
		}

		if (changed.indentation) {
			if (this.state.indentation) {
				this.indentationElement.textContent = this.state.indentation;
				show(this.indentationElement);
			} else {
				hide(this.indentationElement);
			}
		}

		if (changed.selectionStatus) {
			if (this.state.selectionStatus && !this.state.screenReaderMode) {
				this.selectionElement.textContent = this.state.selectionStatus;
				show(this.selectionElement);
			} else {
				hide(this.selectionElement);
			}
		}

		if (changed.encoding) {
			if (this.state.encoding) {
				this.encodingElement.textContent = this.state.encoding;
				show(this.encodingElement);
			} else {
				hide(this.encodingElement);
			}
		}

		if (changed.EOL) {
			if (this.state.EOL) {
				this.eolElement.textContent = this.state.EOL === '\r\n' ? nlsEOLCRLF : nlsEOLLF;
				show(this.eolElement);
			} else {
				hide(this.eolElement);
			}
		}

		if (changed.mode) {
			if (this.state.mode) {
				this.modeElement.textContent = this.state.mode;
				show(this.modeElement);
			} else {
				hide(this.modeElement);
			}
		}

		if (changed.metadata) {
			if (this.state.metadata) {
				this.metadataElement.textContent = this.state.metadata;
				show(this.metadataElement);
			} else {
				hide(this.metadataElement);
			}
		}
	}

	private getSelectionLabel(info: IEditorSelectionStatus): string {
		if (!info || !info.selections) {
			return null;
		}

		if (info.selections.length === 1) {
			if (info.charactersSelected) {
				return strings.format(nlsSingleSelectionRange, info.selections[0].positionLineNumber, info.selections[0].positionColumn, info.charactersSelected);
			}

			return strings.format(nlsSingleSelection, info.selections[0].positionLineNumber, info.selections[0].positionColumn);
		}

		if (info.charactersSelected) {
			return strings.format(nlsMultiSelectionRange, info.selections.length, info.charactersSelected);
		}

		if (info.selections.length > 0) {
			return strings.format(nlsMultiSelection, info.selections.length);
		}

		return null;
	}

	private onModeClick(): void {
		const action = this.instantiationService.createInstance(ChangeModeAction, ChangeModeAction.ID, ChangeModeAction.LABEL);

		action.run().done(null, errors.onUnexpectedError);
		action.dispose();
	}

	private onIndentationClick(): void {
		const action = this.instantiationService.createInstance(ChangeIndentationAction, ChangeIndentationAction.ID, ChangeIndentationAction.LABEL);
		action.run().done(null, errors.onUnexpectedError);
		action.dispose();
	}

	private onScreenReaderModeClick(): void {
		this.lastScreenReaderExplanation = this.instantiationService.createInstance(ScreenReaderDetectedExplanation, this.screenRedearModeElement);
	}

	private onSelectionClick(): void {
		this.quickOpenService.show(':'); // "Go to line"
	}

	private onEOLClick(): void {
		const action = this.instantiationService.createInstance(ChangeEOLAction, ChangeEOLAction.ID, ChangeEOLAction.LABEL);

		action.run().done(null, errors.onUnexpectedError);
		action.dispose();
	}

	private onEncodingClick(): void {
		const action = this.instantiationService.createInstance(ChangeEncodingAction, ChangeEncodingAction.ID, ChangeEncodingAction.LABEL);

		action.run().done(null, errors.onUnexpectedError);
		action.dispose();
	}

	private onTabFocusModeClick(): void {
		TabFocus.setTabFocusMode(false);
	}

	private onEditorsChanged(): void {
		const activeEditor = this.editorService.getActiveEditor();
		const control = getEditorWidget(activeEditor);

		// Update all states
		this.onScreenReaderModeChange(control);
		this.onSelectionChange(control);
		this.onModeChange(control);
		this.onEOLChange(control);
		this.onEncodingChange(activeEditor);
		this.onIndentationChange(control);
		this.onMetadataChange(activeEditor);

		// Dispose old active editor listeners
		dispose(this.activeEditorListeners);

		// Attach new listeners to active editor
		if (control) {

			// Hook Listener for Configuration changes
			this.activeEditorListeners.push(control.onDidChangeConfiguration((event: IConfigurationChangedEvent) => {
				if (event.accessibilitySupport) {
					this.onScreenReaderModeChange(control);
				}
			}));

			// Hook Listener for Selection changes
			this.activeEditorListeners.push(control.onDidChangeCursorPosition((event: ICursorPositionChangedEvent) => {
				this.onSelectionChange(control);
			}));

			// Hook Listener for mode changes
			this.activeEditorListeners.push(control.onDidChangeModelLanguage((event: IModelLanguageChangedEvent) => {
				this.onModeChange(control);
			}));

			// Hook Listener for content changes
			this.activeEditorListeners.push(control.onDidChangeModelContent((e) => {
				this.onEOLChange(control);
			}));

			// Hook Listener for content options changes
			this.activeEditorListeners.push(control.onDidChangeModelOptions((event: IModelOptionsChangedEvent) => {
				this.onIndentationChange(control);
			}));
		}

		// Handle binary editors
		else if (activeEditor instanceof BaseBinaryResourceEditor || activeEditor instanceof BinaryResourceDiffEditor) {
			const binaryEditors: BaseBinaryResourceEditor[] = [];
			if (activeEditor instanceof BinaryResourceDiffEditor) {
				const details = activeEditor.getDetailsEditor();
				if (details instanceof BaseBinaryResourceEditor) {
					binaryEditors.push(details);
				}

				const master = activeEditor.getMasterEditor();
				if (master instanceof BaseBinaryResourceEditor) {
					binaryEditors.push(master);
				}
			} else {
				binaryEditors.push(activeEditor);
			}

			binaryEditors.forEach(editor => {
				this.activeEditorListeners.push(editor.onMetadataChanged(metadata => {
					this.onMetadataChange(activeEditor);
				}));
			});
		}
	}

	private onModeChange(editorWidget: ICommonCodeEditor): void {
		let info: StateDelta = { mode: null };

		// We only support text based editors
		if (editorWidget) {
			const textModel = editorWidget.getModel();
			if (textModel) {
				// Compute mode
				const modeId = textModel.getLanguageIdentifier().language;
				info = { mode: this.modeService.getLanguageName(modeId) };
			}
		}

		this.updateState(info);
	}

	private onIndentationChange(editorWidget: ICommonCodeEditor): void {
		const update: StateDelta = { indentation: null };

		if (editorWidget) {
			const model = editorWidget.getModel();
			if (model) {
				const modelOpts = model.getOptions();
				update.indentation = (
					modelOpts.insertSpaces
						? nls.localize('spacesSize', "Spaces: {0}", modelOpts.tabSize)
						: nls.localize({ key: 'tabSize', comment: ['Tab corresponds to the tab key'] }, "Tab Size: {0}", modelOpts.tabSize)
				);
			}
		}

		this.updateState(update);
	}

	private onMetadataChange(editor: IBaseEditor): void {
		const update: StateDelta = { metadata: null };

		if (editor instanceof BaseBinaryResourceEditor || editor instanceof BinaryResourceDiffEditor) {
			update.metadata = editor.getMetadata();
		}

		this.updateState(update);
	}

	private _promptedScreenReader: boolean = false;

	private onScreenReaderModeChange(editorWidget: ICommonCodeEditor): void {
		let screenReaderMode = false;

		// We only support text based editors
		if (editorWidget) {
			const screenReaderDetected = (browser.getAccessibilitySupport() === AccessibilitySupport.Enabled);
			if (screenReaderDetected) {
				const screenReaderConfiguration = this.configurationService.getConfiguration<IEditorOptions>('editor').accessibilitySupport;
				if (screenReaderConfiguration === 'auto') {
					// show explanation
					if (!this._promptedScreenReader) {
						this._promptedScreenReader = true;
						setTimeout(() => {
							this.onScreenReaderModeClick();
						}, 100);
					}
				}
			}

			screenReaderMode = (editorWidget.getConfiguration().accessibilitySupport === AccessibilitySupport.Enabled);
		}

		if (screenReaderMode === false && this.lastScreenReaderExplanation) {
			this.lastScreenReaderExplanation.hide();
			this.lastScreenReaderExplanation = null;
		}

		this.updateState({ screenReaderMode: screenReaderMode });
	}

	private onSelectionChange(editorWidget: ICommonCodeEditor): void {
		const info: IEditorSelectionStatus = {};

		// We only support text based editors
		if (editorWidget) {

			// Compute selection(s)
			info.selections = editorWidget.getSelections() || [];

			// Compute selection length
			info.charactersSelected = 0;
			const textModel = editorWidget.getModel();
			if (textModel) {
				info.selections.forEach(selection => {
					info.charactersSelected += textModel.getValueLengthInRange(selection);
				});
			}

			// Compute the visible column for one selection. This will properly handle tabs and their configured widths
			if (info.selections.length === 1) {
				const visibleColumn = editorWidget.getVisibleColumnFromPosition(editorWidget.getPosition());

				let selectionClone = info.selections[0].clone(); // do not modify the original position we got from the editor
				selectionClone = new Selection(
					selectionClone.selectionStartLineNumber,
					selectionClone.selectionStartColumn,
					selectionClone.positionLineNumber,
					visibleColumn
				);

				info.selections[0] = selectionClone;
			}
		}

		this.updateState({ selectionStatus: this.getSelectionLabel(info) });
	}

	private onEOLChange(editorWidget: ICommonCodeEditor): void {
		const info: StateDelta = { EOL: null };

		if (editorWidget && !editorWidget.getConfiguration().readOnly) {
			const codeEditorModel = editorWidget.getModel();
			if (codeEditorModel) {
				info.EOL = codeEditorModel.getEOL();
			}
		}

		this.updateState(info);
	}

	private onEncodingChange(e: IBaseEditor): void {
		if (e && !this.isActiveEditor(e)) {
			return;
		}

		const info: StateDelta = { encoding: null };

		// We only support text based editors
		if (getEditorWidget(e)) {
			const encodingSupport: IEncodingSupport = toEditorWithEncodingSupport(e.input);
			if (encodingSupport) {
				const rawEncoding = encodingSupport.getEncoding();
				const encodingInfo = SUPPORTED_ENCODINGS[rawEncoding];
				if (encodingInfo) {
					info.encoding = encodingInfo.labelShort; // if we have a label, take it from there
				} else {
					info.encoding = rawEncoding; // otherwise use it raw
				}
			}
		}

		this.updateState(info);
	}

	private onResourceEncodingChange(resource: uri): void {
		const activeEditor = this.editorService.getActiveEditor();
		if (activeEditor) {
			const activeResource = toResource(activeEditor.input, { supportSideBySide: true });
			if (activeResource && activeResource.toString() === resource.toString()) {
				return this.onEncodingChange(<IBaseEditor>activeEditor); // only update if the encoding changed for the active resource
			}
		}
	}

	private onTabFocusModeChange(): void {
		const info: StateDelta = { tabFocusMode: TabFocus.getTabFocusMode() };

		this.updateState(info);
	}

	private isActiveEditor(e: IBaseEditor): boolean {
		const activeEditor = this.editorService.getActiveEditor();

		return activeEditor && e && activeEditor === e;
	}
}

function isWritableCodeEditor(codeEditor: ICommonCodeEditor): boolean {
	if (!codeEditor) {
		return false;
	}
	const config = codeEditor.getConfiguration();
	return (!config.readOnly);
}

function isWritableBaseEditor(e: IBaseEditor): boolean {
	return isWritableCodeEditor(getEditorWidget(e));
}

export class ShowLanguageExtensionsAction extends Action {

	static ID = 'workbench.action.showLanguageExtensions';

	constructor(
		private fileExtension: string,
		@ICommandService private commandService: ICommandService,
		@IExtensionGalleryService galleryService: IExtensionGalleryService
	) {
		super(ShowLanguageExtensionsAction.ID, nls.localize('showLanguageExtensions', "Search Marketplace Extensions for '{0}'...", fileExtension));

		this.enabled = galleryService.isEnabled();
	}

	run(): TPromise<void> {
		return this.commandService.executeCommand('workbench.extensions.action.showExtensionsForLanguage', this.fileExtension).then(() => void 0);
	}
}

export class ChangeModeAction extends Action {

	public static ID = 'workbench.action.editor.changeLanguageMode';
	public static LABEL = nls.localize('changeMode', "Change Language Mode");

	constructor(
		actionId: string,
		actionLabel: string,
		@IModeService private modeService: IModeService,
		@IModelService private modelService: IModelService,
		@IWorkbenchEditorService private editorService: IWorkbenchEditorService,
		@IWorkspaceConfigurationService private configurationService: IWorkspaceConfigurationService,
		@IQuickOpenService private quickOpenService: IQuickOpenService,
		@IPreferencesService private preferencesService: IPreferencesService,
		@IInstantiationService private instantiationService: IInstantiationService,
		@IUntitledEditorService private untitledEditorService: IUntitledEditorService
	) {
		super(actionId, actionLabel);
	}

	public run(): TPromise<any> {
		let activeEditor = this.editorService.getActiveEditor();
		const editorWidget = getEditorWidget(activeEditor);
		if (!editorWidget) {
			return this.quickOpenService.pick([{ label: nls.localize('noEditor', "No text editor active at this time") }]);
		}

		const textModel = editorWidget.getModel();
		const resource = toResource(activeEditor.input, { supportSideBySide: true });

		let hasLanguageSupport = !!resource;
		if (resource.scheme === 'untitled' && !this.untitledEditorService.hasAssociatedFilePath(resource)) {
			hasLanguageSupport = false; // no configuration for untitled resources (e.g. "Untitled-1")
		}

		// Compute mode
		let currentModeId: string;
		let modeId: string;
		if (textModel) {
			modeId = textModel.getLanguageIdentifier().language;
			currentModeId = this.modeService.getLanguageName(modeId);
		}

		// All languages are valid picks
		const languages = this.modeService.getRegisteredLanguageNames();
		const picks: IPickOpenEntry[] = languages.sort().map((lang, index) => {
			let description: string;
			if (currentModeId === lang) {
				description = nls.localize('languageDescription', "({0}) - Configured Language", this.modeService.getModeIdForLanguageName(lang.toLowerCase()));
			} else {
				description = nls.localize('languageDescriptionConfigured', "({0})", this.modeService.getModeIdForLanguageName(lang.toLowerCase()));
			}

			// construct a fake resource to be able to show nice icons if any
			let fakeResource: uri;
			const extensions = this.modeService.getExtensions(lang);
			if (extensions && extensions.length) {
				fakeResource = uri.file(extensions[0]);
			} else {
				const filenames = this.modeService.getFilenames(lang);
				if (filenames && filenames.length) {
					fakeResource = uri.file(filenames[0]);
				}
			}

			return <IFilePickOpenEntry>{
				label: lang,
				resource: fakeResource,
				description
			};
		});

		if (hasLanguageSupport) {
			picks[0].separator = { border: true, label: nls.localize('languagesPicks', "languages (identifier)") };
		}

		// Offer action to configure via settings
		let configureModeAssociations: IPickOpenEntry;
		let configureModeSettings: IPickOpenEntry;
		let galleryAction: Action;
		if (hasLanguageSupport) {
			const ext = paths.extname(resource.fsPath) || paths.basename(resource.fsPath);

			galleryAction = this.instantiationService.createInstance(ShowLanguageExtensionsAction, ext);
			if (galleryAction.enabled) {
				picks.unshift(galleryAction);
			}

			configureModeSettings = { label: nls.localize('configureModeSettings', "Configure '{0}' language based settings...", currentModeId) };
			picks.unshift(configureModeSettings);
			configureModeAssociations = { label: nls.localize('configureAssociationsExt', "Configure File Association for '{0}'...", ext) };
			picks.unshift(configureModeAssociations);
		}

		// Offer to "Auto Detect"
		const autoDetectMode: IPickOpenEntry = {
			label: nls.localize('autoDetect', "Auto Detect")
		};

		if (hasLanguageSupport) {
			picks.unshift(autoDetectMode);
		}

		return this.quickOpenService.pick(picks, { placeHolder: nls.localize('pickLanguage', "Select Language Mode") }).then(pick => {
			if (!pick) {
				return;
			}

			if (pick === galleryAction) {
				galleryAction.run();
				return;
			}

			// User decided to permanently configure associations, return right after
			if (pick === configureModeAssociations) {
				this.configureFileAssociation(resource);
				return;
			}

			// User decided to configure settings for current language
			if (pick === configureModeSettings) {
				this.preferencesService.configureSettingsForLanguage(modeId);
				return;
			}

			// Change mode for active editor
			activeEditor = this.editorService.getActiveEditor();
			const codeOrDiffEditor = getCodeOrDiffEditor(activeEditor);
			const models: IModel[] = [];
			if (codeOrDiffEditor.codeEditor) {
				const codeEditorModel = codeOrDiffEditor.codeEditor.getModel();
				if (codeEditorModel) {
					models.push(codeEditorModel);
				}
			}
			if (codeOrDiffEditor.diffEditor) {
				const diffEditorModel = codeOrDiffEditor.diffEditor.getModel();
				if (diffEditorModel) {
					if (diffEditorModel.original) {
						models.push(diffEditorModel.original);
					}
					if (diffEditorModel.modified) {
						models.push(diffEditorModel.modified);
					}
				}
			}

			// Find mode
			let mode: TPromise<IMode>;
			if (pick === autoDetectMode) {
				mode = this.modeService.getOrCreateModeByFilenameOrFirstLine(toResource(activeEditor.input, { supportSideBySide: true }).fsPath, textModel.getLineContent(1));
			} else {
				mode = this.modeService.getOrCreateModeByLanguageName(pick.label);
			}

			// Change mode
			models.forEach(textModel => {
				this.modelService.setMode(textModel, mode);
			});
		});
	}

	private configureFileAssociation(resource: uri): void {
		const extension = paths.extname(resource.fsPath);
		const basename = paths.basename(resource.fsPath);
		const currentAssociation = this.modeService.getModeIdByFilenameOrFirstLine(basename);

		const languages = this.modeService.getRegisteredLanguageNames();
		const picks: IPickOpenEntry[] = languages.sort().map((lang, index) => {
			const id = this.modeService.getModeIdForLanguageName(lang.toLowerCase());

			return <IPickOpenEntry>{
				id,
				label: lang,
				description: (id === currentAssociation) ? nls.localize('currentAssociation', "Current Association") : void 0
			};
		});

		TPromise.timeout(50 /* quick open is sensitive to being opened so soon after another */).done(() => {
			this.quickOpenService.pick(picks, { placeHolder: nls.localize('pickLanguageToConfigure', "Select Language Mode to Associate with '{0}'", extension || basename) }).done(language => {
				if (language) {
					const fileAssociationsConfig = this.configurationService.inspect(FILES_ASSOCIATIONS_CONFIG);

					let associationKey: string;
					if (extension && basename[0] !== '.') {
						associationKey = `*${extension}`; // only use "*.ext" if the file path is in the form of <name>.<ext>
					} else {
						associationKey = basename; // otherwise use the basename (e.g. .gitignore, Dockerfile)
					}

					// If the association is already being made in the workspace, make sure to target workspace settings
					let target = ConfigurationTarget.USER;
					if (fileAssociationsConfig.workspace && !!fileAssociationsConfig.workspace[associationKey]) {
						target = ConfigurationTarget.WORKSPACE;
					}

					// Make sure to write into the value of the target and not the merged value from USER and WORKSPACE config
					let currentAssociations = (target === ConfigurationTarget.WORKSPACE) ? fileAssociationsConfig.workspace : fileAssociationsConfig.user;
					if (!currentAssociations) {
						currentAssociations = Object.create(null);
					}

					currentAssociations[associationKey] = language.id;

					this.configurationService.updateValue(FILES_ASSOCIATIONS_CONFIG, currentAssociations, target);
				}
			});
		});
	}
}

export interface IChangeEOLEntry extends IPickOpenEntry {
	eol: EndOfLineSequence;
}

class ChangeIndentationAction extends Action {

	public static ID = 'workbench.action.editor.changeIndentation';
	public static LABEL = nls.localize('changeIndentation', "Change Indentation");

	constructor(
		actionId: string,
		actionLabel: string,
		@IWorkbenchEditorService private editorService: IWorkbenchEditorService,
		@IQuickOpenService private quickOpenService: IQuickOpenService
	) {
		super(actionId, actionLabel);
	}

	public run(): TPromise<any> {
		const activeEditor = this.editorService.getActiveEditor();
		const control = getEditorWidget(activeEditor);
		if (!control) {
			return this.quickOpenService.pick([{ label: nls.localize('noEditor', "No text editor active at this time") }]);
		}
		if (!isWritableCodeEditor(control)) {
			return this.quickOpenService.pick([{ label: nls.localize('noWritableCodeEditor', "The active code editor is read-only.") }]);
		}

		const picks = [
			control.getAction(IndentUsingSpaces.ID),
			control.getAction(IndentUsingTabs.ID),
			control.getAction(DetectIndentation.ID),
			control.getAction(IndentationToSpacesAction.ID),
			control.getAction(IndentationToTabsAction.ID),
			control.getAction(TrimTrailingWhitespaceAction.ID)
		].map((a: IEditorAction) => {
			return {
				id: a.id,
				label: a.label,
				detail: (language === LANGUAGE_DEFAULT) ? null : a.alias,
				run: () => {
					control.focus();
					a.run();
				}
			};
		});

		(<IPickOpenEntry>picks[0]).separator = { label: nls.localize('indentView', "change view") };
		(<IPickOpenEntry>picks[3]).separator = { label: nls.localize('indentConvert', "convert file"), border: true };

		return this.quickOpenService.pick(picks, { placeHolder: nls.localize('pickAction', "Select Action"), matchOnDetail: true }).then(action => action && action.run());
	}
}

export class ChangeEOLAction extends Action {

	public static ID = 'workbench.action.editor.changeEOL';
	public static LABEL = nls.localize('changeEndOfLine', "Change End of Line Sequence");

	constructor(
		actionId: string,
		actionLabel: string,
		@IWorkbenchEditorService private editorService: IWorkbenchEditorService,
		@IQuickOpenService private quickOpenService: IQuickOpenService
	) {
		super(actionId, actionLabel);
	}

	public run(): TPromise<any> {
		let activeEditor = this.editorService.getActiveEditor();
		const editorWidget = getEditorWidget(activeEditor);
		if (!editorWidget) {
			return this.quickOpenService.pick([{ label: nls.localize('noEditor', "No text editor active at this time") }]);
		}

		if (!isWritableCodeEditor(editorWidget)) {
			return this.quickOpenService.pick([{ label: nls.localize('noWritableCodeEditor', "The active code editor is read-only.") }]);
		}

		const textModel = editorWidget.getModel();

		const EOLOptions: IChangeEOLEntry[] = [
			{ label: nlsEOLLF, eol: EndOfLineSequence.LF },
			{ label: nlsEOLCRLF, eol: EndOfLineSequence.CRLF },
		];

		const selectedIndex = (textModel && textModel.getEOL() === '\n') ? 0 : 1;

		return this.quickOpenService.pick(EOLOptions, { placeHolder: nls.localize('pickEndOfLine', "Select End of Line Sequence"), autoFocus: { autoFocusIndex: selectedIndex } }).then(eol => {
			if (eol) {
				activeEditor = this.editorService.getActiveEditor();
				const editorWidget = getEditorWidget(activeEditor);
				if (editorWidget && isWritableCodeEditor(editorWidget)) {
					const textModel = editorWidget.getModel();
					textModel.setEOL(eol.eol);
				}
			}
		});
	}
}

export class ChangeEncodingAction extends Action {

	public static ID = 'workbench.action.editor.changeEncoding';
	public static LABEL = nls.localize('changeEncoding', "Change File Encoding");

	constructor(
		actionId: string,
		actionLabel: string,
		@IWorkbenchEditorService private editorService: IWorkbenchEditorService,
		@IQuickOpenService private quickOpenService: IQuickOpenService,
		@ITextResourceConfigurationService private textResourceConfigurationService: ITextResourceConfigurationService,
		@IFileService private fileService: IFileService
	) {
		super(actionId, actionLabel);
	}

	public run(): TPromise<any> {
		let activeEditor = this.editorService.getActiveEditor();
		if (!getEditorWidget(activeEditor) || !activeEditor.input) {
			return this.quickOpenService.pick([{ label: nls.localize('noEditor', "No text editor active at this time") }]);
		}

		let encodingSupport: IEncodingSupport = toEditorWithEncodingSupport(activeEditor.input);
		if (!encodingSupport) {
			return this.quickOpenService.pick([{ label: nls.localize('noFileEditor', "No file active at this time") }]);
		}

		let pickActionPromise: TPromise<IPickOpenEntry>;

		let saveWithEncodingPick: IPickOpenEntry;
		let reopenWithEncodingPick: IPickOpenEntry;
		if (language === LANGUAGE_DEFAULT) {
			saveWithEncodingPick = { label: nls.localize('saveWithEncoding', "Save with Encoding") };
			reopenWithEncodingPick = { label: nls.localize('reopenWithEncoding', "Reopen with Encoding") };
		} else {
			saveWithEncodingPick = { label: nls.localize('saveWithEncoding', "Save with Encoding"), detail: 'Save with Encoding', };
			reopenWithEncodingPick = { label: nls.localize('reopenWithEncoding', "Reopen with Encoding"), detail: 'Reopen with Encoding' };
		}

		if (encodingSupport instanceof UntitledEditorInput) {
			pickActionPromise = TPromise.as(saveWithEncodingPick);
		} else if (!isWritableBaseEditor(activeEditor)) {
			pickActionPromise = TPromise.as(reopenWithEncodingPick);
		} else {
			pickActionPromise = this.quickOpenService.pick([reopenWithEncodingPick, saveWithEncodingPick], { placeHolder: nls.localize('pickAction', "Select Action"), matchOnDetail: true });
		}

		return pickActionPromise.then(action => {
			if (!action) {
				return void 0;
			}

			const resource = toResource(activeEditor.input, { supportSideBySide: true });

			return TPromise.timeout(50 /* quick open is sensitive to being opened so soon after another */)
				.then(() => {
					if (!resource || !this.fileService.canHandleResource(resource)) {
						return TPromise.as(null); // encoding detection only possible for resources the file service can handle
					}

					return this.fileService.resolveContent(resource, { autoGuessEncoding: true, acceptTextOnly: true }).then(content => content.encoding, err => null);
				})
				.then((guessedEncoding: string) => {
					const isReopenWithEncoding = (action === reopenWithEncodingPick);

					const config = this.textResourceConfigurationService.getConfiguration(resource) as IFilesConfiguration;
					const configuredEncoding = config && config.files && config.files.encoding;

					let directMatchIndex: number;
					let aliasMatchIndex: number;

					// All encodings are valid picks
					const picks: IPickOpenEntry[] = Object.keys(SUPPORTED_ENCODINGS)
						.sort((k1, k2) => {
							if (k1 === configuredEncoding) {
								return -1;
							} else if (k2 === configuredEncoding) {
								return 1;
							}

							return SUPPORTED_ENCODINGS[k1].order - SUPPORTED_ENCODINGS[k2].order;
						})
						.filter(k => {
							if (k === guessedEncoding && guessedEncoding !== configuredEncoding) {
								return false; // do not show encoding if it is the guessed encoding that does not match the configured
							}

							return !isReopenWithEncoding || !SUPPORTED_ENCODINGS[k].encodeOnly; // hide those that can only be used for encoding if we are about to decode
						})
						.map((key, index) => {
							if (key === encodingSupport.getEncoding()) {
								directMatchIndex = index;
							} else if (SUPPORTED_ENCODINGS[key].alias === encodingSupport.getEncoding()) {
								aliasMatchIndex = index;
							}

							return { id: key, label: SUPPORTED_ENCODINGS[key].labelLong, description: key };
						});

					// If we have a guessed encoding, show it first unless it matches the configured encoding
					if (guessedEncoding && configuredEncoding !== guessedEncoding && SUPPORTED_ENCODINGS[guessedEncoding]) {
						picks[0].separator = { border: true };
						picks.unshift({ id: guessedEncoding, label: SUPPORTED_ENCODINGS[guessedEncoding].labelLong, description: nls.localize('guessedEncoding', "Guessed from content") });
					}

					return this.quickOpenService.pick(picks, {
						placeHolder: isReopenWithEncoding ? nls.localize('pickEncodingForReopen', "Select File Encoding to Reopen File") : nls.localize('pickEncodingForSave', "Select File Encoding to Save with"),
						autoFocus: { autoFocusIndex: typeof directMatchIndex === 'number' ? directMatchIndex : typeof aliasMatchIndex === 'number' ? aliasMatchIndex : void 0 }
					}).then(encoding => {
						if (encoding) {
							activeEditor = this.editorService.getActiveEditor();
							encodingSupport = toEditorWithEncodingSupport(activeEditor.input);
							if (encodingSupport && encodingSupport.getEncoding() !== encoding.id) {
								encodingSupport.setEncoding(encoding.id, isReopenWithEncoding ? EncodingMode.Decode : EncodingMode.Encode); // Set new encoding
							}
						}
					});
				});
		});
	}
}

class ScreenReaderDetectedExplanation {

	private _isDisposed: boolean;
	private _toDispose: IDisposable[];

	constructor(
		anchorElement: HTMLElement,
		@IThemeService private readonly themeService: IThemeService,
		@IContextViewService private readonly contextViewService: IContextViewService,
		@IWorkspaceConfigurationService private readonly configurationService: IWorkspaceConfigurationService,
	) {
		this._isDisposed = false;
		this._toDispose = [];

		this.contextViewService.showContextView({
			getAnchor: () => anchorElement,

			render: (container) => {
				return this.renderContents(container);
			},

			onDOMEvent: (e, activeElement) => {
			},

			onHide: () => {
				this.dispose();
			}
		});
	}

	public dispose(): void {
		this._isDisposed = true;
		this._toDispose = dispose(this._toDispose);
	}

	public hide(): void {
		if (this._isDisposed) {
			return;
		}
		this.contextViewService.hideContextView();
	}

	protected renderContents(container: HTMLElement): IDisposable {
		const domNode = $('div.screen-reader-detected-explanation', {
			'aria-hidden': 'true'
		});

		const title = $('h2.title', {}, nls.localize('screenReaderDetectedExplanation.title', "Screen Reader Optimized"));
		domNode.appendChild(title);

		const closeBtn = $('div.cancel');
		this._toDispose.push(addDisposableListener(closeBtn, 'click', () => {
			this.contextViewService.hideContextView();
		}));
		domNode.appendChild(closeBtn);

		const question = $('p.question', {}, nls.localize('screenReaderDetectedExplanation.question', "Are you using a screen reader to operate VS Code?"));
		domNode.appendChild(question);

		const yesBtn = $('div.button', {}, nls.localize('screenReaderDetectedExplanation.answerYes', "Yes"));
		this._toDispose.push(addDisposableListener(yesBtn, 'click', () => {
			this.configurationService.updateValue('editor.accessibilitySupport', 'on', ConfigurationTarget.USER);
			this.contextViewService.hideContextView();
		}));
		domNode.appendChild(yesBtn);

		const noBtn = $('div.button', {}, nls.localize('screenReaderDetectedExplanation.answerNo', "No"));
		this._toDispose.push(addDisposableListener(noBtn, 'click', () => {
			this.configurationService.updateValue('editor.accessibilitySupport', 'off', ConfigurationTarget.USER);
			this.contextViewService.hideContextView();
		}));
		domNode.appendChild(noBtn);

		const clear = $('div');
		clear.style.clear = 'both';
		domNode.appendChild(clear);

		const br = $('br');
		domNode.appendChild(br);

		const hr = $('hr');
		domNode.appendChild(hr);

		const explanation1 = $('p.body1', {}, nls.localize('screenReaderDetectedExplanation.body1', "VS Code is now optimized for usage with a screen reader."));
		domNode.appendChild(explanation1);

		const explanation2 = $('p.body2', {}, nls.localize('screenReaderDetectedExplanation.body2', "Some editor features will have different behaviour: e.g. word wrapping, folding, etc."));
		domNode.appendChild(explanation2);

		container.appendChild(domNode);

		this._toDispose.push(attachStylerCallback(this.themeService, { widgetShadow, editorWidgetBackground }, colors => {
			domNode.style.backgroundColor = colors.editorWidgetBackground;
			if (colors.widgetShadow) {
				domNode.style.boxShadow = `0 2px 8px ${colors.widgetShadow}`;
			}
		}));

		return {
			dispose: () => { this.dispose(); }
		};
	}
}