123 lines
3.4 KiB
TypeScript
123 lines
3.4 KiB
TypeScript
/**
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* preview.ts
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*
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* @author CismonX <admin@cismon.net>
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* @license MIT
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*/
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import * as vscode from 'vscode';
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import * as path from 'path';
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import { Converter } from './converter';
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import { prompt } from './utils';
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/**
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* Texinfo document preview.
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*/
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export class Preview {
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private static readonly map = new Map<vscode.TextDocument, Preview>();
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/**
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* Create (if not yet created) and show preview for a Texinfo document.
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*
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* @param editor The editor where the document is being held.
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*/
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static async show(editor: vscode.TextEditor) {
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const document = editor.document;
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if (document.isUntitled) {
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if (!await prompt('Save this document to display preview.', 'Save')) {
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return;
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}
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if (!await document.save()) {
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return;
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}
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}
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(Preview.map.get(document) ?? new Preview(document)).panel.reveal();
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}
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/**
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* If the document has a corresponding Texinfo preview, update the preview.
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*
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* @param document
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*/
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static update(document: vscode.TextDocument) {
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Preview.getByDocument(document)?.updateWebview();
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}
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/**
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* If the document has a corresponding Texinfo preview, close the preview.
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*
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* @param document
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*/
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static close(document: vscode.TextDocument) {
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Preview.getByDocument(document)?.destroy();
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}
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static destroyAll() {
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Preview.map.forEach((preview) => preview.destroy());
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}
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/**
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* Get associated preview instance of the given document.
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*
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* @param document
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*/
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private static getByDocument(document: vscode.TextDocument) {
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return document.languageId !== 'texinfo' ? undefined : Preview.map.get(document);
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}
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private readonly panel: vscode.WebviewPanel;
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private readonly disposables = new Array<vscode.Disposable>();
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/**
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* Whether the preview is updating.
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*/
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private updating = false;
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/**
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* Whether a preview update request is pending.
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*/
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private pendingUpdate = false;
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private constructor(private readonly document: vscode.TextDocument) {
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this.panel = vscode.window.createWebviewPanel('texinfo.preview', '', vscode.ViewColumn.Beside);
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this.disposables.push(this.panel.onDidDispose(() => this.destroy()));
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Preview.map.set(this.document, this);
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this.updateWebview();
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}
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private get title() {
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const updating = this.updating ? '(Updating) ' : '';
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const fileName = path.basename(this.document.fileName);
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return `${updating}Preview ${fileName}`;
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}
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private destroy() {
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this.disposables.forEach((event) => event.dispose());
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this.panel.dispose();
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Preview.map.delete(this.document);
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}
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private async updateWebview() {
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if (this.updating) {
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this.pendingUpdate = true;
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return;
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}
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this.updating = true;
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this.pendingUpdate = false;
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this.panel.title = this.title;
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const htmlCode = await Converter.convert(this.document.fileName);
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if (htmlCode === undefined) {
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vscode.window.showErrorMessage(`Failed to show preview for file ${this.document.fileName}.`);
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} else {
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this.panel.webview.html = htmlCode;
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}
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this.updating = false;
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this.panel.title = this.title;
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if (this.pendingUpdate) {
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this.updateWebview();
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}
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}
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}
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