BookStack Code Mirror - bookstack/blob - resources/assets/js/components/markdown-editor.js

   1 import MarkdownIt from "markdown-it";
   2 import mdTasksLists from 'markdown-it-task-lists';
   3 import code from '../services/code';
   4 import {debounce} from "../services/util";
   5
   6 import DrawIO from "../services/drawio";
   7
   8 class MarkdownEditor {
   9
  10     constructor(elem) {
  11         this.elem = elem;
  12
  13         const pageEditor = document.getElementById('page-editor');
  14         this.pageId = pageEditor.getAttribute('page-id');
  15         this.textDirection = pageEditor.getAttribute('text-direction');
  16
  17         this.markdown = new MarkdownIt({html: true});
  18         this.markdown.use(mdTasksLists, {label: true});
  19
  20         this.display = this.elem.querySelector('.markdown-display');
  21         this.displayDoc = this.display.contentDocument;
  22         this.displayStylesLoaded = false;
  23         this.input = this.elem.querySelector('textarea');
  24         this.htmlInput = this.elem.querySelector('input[name=html]');
  25         this.cm = code.markdownEditor(this.input);
  26
  27         this.onMarkdownScroll = this.onMarkdownScroll.bind(this);
  28         this.init();
  29
  30         // Scroll to text if needed.
  31         const queryParams = (new URL(window.location)).searchParams;
  32         const scrollText = queryParams.get('content-text');
  33         if (scrollText) {
  34             this.scrollToText(scrollText);
  35         }
  36     }
  37
  38     init() {
  39
  40         let lastClick = 0;
  41
  42         // Prevent markdown display link click redirect
  43         this.displayDoc.addEventListener('click', event => {
  44             let isDblClick = Date.now() - lastClick < 300;
  45
  46             let link = event.target.closest('a');
  47             if (link !== null) {
  48                 event.preventDefault();
  49                 window.open(link.getAttribute('href'));
  50                 return;
  51             }
  52
  53             let drawing = event.target.closest('[drawio-diagram]');
  54             if (drawing !== null && isDblClick) {
  55                 this.actionEditDrawing(drawing);
  56                 return;
  57             }
  58
  59             lastClick = Date.now();
  60         });
  61
  62         // Button actions
  63         this.elem.addEventListener('click', event => {
  64             let button = event.target.closest('button[data-action]');
  65             if (button === null) return;
  66
  67             let action = button.getAttribute('data-action');
  68             if (action === 'insertImage') this.actionInsertImage();
  69             if (action === 'insertLink') this.actionShowLinkSelector();
  70             if (action === 'insertDrawing' && (event.ctrlKey || event.metaKey)) {
  71                 this.actionShowImageManager();
  72                 return;
  73             }
  74             if (action === 'insertDrawing') this.actionStartDrawing();
  75         });
  76
  77         // Mobile section toggling
  78         this.elem.addEventListener('click', event => {
  79             const toolbarLabel = event.target.closest('.editor-toolbar-label');
  80             if (!toolbarLabel) return;
  81
  82             const currentActiveSections = this.elem.querySelectorAll('.markdown-editor-wrap');
  83             for (let activeElem of currentActiveSections) {
  84                 activeElem.classList.remove('active');
  85             }
  86
  87             toolbarLabel.closest('.markdown-editor-wrap').classList.add('active');
  88         });
  89
  90         window.$events.listen('editor-markdown-update', value => {
  91             this.cm.setValue(value);
  92             this.updateAndRender();
  93         });
  94
  95         this.codeMirrorSetup();
  96         this.listenForBookStackEditorEvents();
  97     }
  98
  99     // Update the input content and render the display.
 100     updateAndRender() {
 101         const content = this.cm.getValue();
 102         this.input.value = content;
 103         const html = this.markdown.render(content);
 104         window.$events.emit('editor-html-change', html);
 105         window.$events.emit('editor-markdown-change', content);
 106
 107         // Set body content
 108         this.displayDoc.body.className = 'page-content';
 109         this.displayDoc.body.innerHTML = html;
 110         this.htmlInput.value = html;
 111
 112         // Copy styles from page head and set custom styles for editor
 113         this.loadStylesIntoDisplay();
 114     }
 115
 116     loadStylesIntoDisplay() {
 117         if (this.displayStylesLoaded) return;
 118         this.displayDoc.documentElement.className = 'markdown-editor-display';
 119
 120         this.displayDoc.head.innerHTML = '';
 121         const styles = document.head.querySelectorAll('style,link[rel=stylesheet]');
 122         for (let style of styles) {
 123             const copy = style.cloneNode(true);
 124             this.displayDoc.head.appendChild(copy);
 125         }
 126
 127         this.displayStylesLoaded = true;
 128     }
 129
 130     onMarkdownScroll(lineCount) {
 131         const elems = this.displayDoc.body.children;
 132         if (elems.length <= lineCount) return;
 133
 134         const topElem = (lineCount === -1) ? elems[elems.length-1] : elems[lineCount];
 135         topElem.scrollIntoView({ block: 'start', inline: 'nearest', behavior: 'smooth'});
 136     }
 137
 138     codeMirrorSetup() {
 139         const cm = this.cm;
 140         const context = this;
 141
 142         // Text direction
 143         // cm.setOption('direction', this.textDirection);
 144         cm.setOption('direction', 'ltr'); // Will force to remain as ltr for now due to issues when HTML is in editor.
 145         // Custom key commands
 146         let metaKey = code.getMetaKey();
 147         const extraKeys = {};
 148         // Insert Image shortcut
 149         extraKeys[`${metaKey}-Alt-I`] = function(cm) {
 150             let selectedText = cm.getSelection();
 151             let newText = `![${selectedText}](http://)`;
 152             let cursorPos = cm.getCursor('from');
 153             cm.replaceSelection(newText);
 154             cm.setCursor(cursorPos.line, cursorPos.ch + newText.length -1);
 155         };
 156         // Save draft
 157         extraKeys[`${metaKey}-S`] = cm => {window.$events.emit('editor-save-draft')};
 158         // Save page
 159         extraKeys[`${metaKey}-Enter`] = cm => {window.$events.emit('editor-save-page')};
 160         // Show link selector
 161         extraKeys[`Shift-${metaKey}-K`] = cm => {this.actionShowLinkSelector()};
 162         // Insert Link
 163         extraKeys[`${metaKey}-K`] = cm => {insertLink()};
 164         // FormatShortcuts
 165         extraKeys[`${metaKey}-1`] = cm => {replaceLineStart('##');};
 166         extraKeys[`${metaKey}-2`] = cm => {replaceLineStart('###');};
 167         extraKeys[`${metaKey}-3`] = cm => {replaceLineStart('####');};
 168         extraKeys[`${metaKey}-4`] = cm => {replaceLineStart('#####');};
 169         extraKeys[`${metaKey}-5`] = cm => {replaceLineStart('');};
 170         extraKeys[`${metaKey}-d`] = cm => {replaceLineStart('');};
 171         extraKeys[`${metaKey}-6`] = cm => {replaceLineStart('>');};
 172         extraKeys[`${metaKey}-q`] = cm => {replaceLineStart('>');};
 173         extraKeys[`${metaKey}-7`] = cm => {wrapSelection('\n```\n', '\n```');};
 174         extraKeys[`${metaKey}-8`] = cm => {wrapSelection('`', '`');};
 175         extraKeys[`Shift-${metaKey}-E`] = cm => {wrapSelection('`', '`');};
 176         extraKeys[`${metaKey}-9`] = cm => {wrapSelection('<p class="callout info">', '</p>');};
 177         cm.setOption('extraKeys', extraKeys);
 178
 179         // Update data on content change
 180         cm.on('change', (instance, changeObj) => {
 181             this.updateAndRender();
 182         });
 183
 184         const onScrollDebounced = debounce((instance) => {
 185             // Thanks to http://liuhao.im/english/2015/11/10/the-sync-scroll-of-markdown-editor-in-javascript.html
 186             let scroll = instance.getScrollInfo();
 187             let atEnd = scroll.top + scroll.clientHeight === scroll.height;
 188             if (atEnd) {
 189                 this.onMarkdownScroll(-1);
 190                 return;
 191             }
 192
 193             let lineNum = instance.lineAtHeight(scroll.top, 'local');
 194             let range = instance.getRange({line: 0, ch: null}, {line: lineNum, ch: null});
 195             let parser = new DOMParser();
 196             let doc = parser.parseFromString(this.markdown.render(range), 'text/html');
 197             let totalLines = doc.documentElement.querySelectorAll('body > *');
 198             this.onMarkdownScroll(totalLines.length);
 199         }, 100);
 200
 201         // Handle scroll to sync display view
 202         cm.on('scroll', instance => {
 203             onScrollDebounced(instance);
 204         });
 205
 206         // Handle image paste
 207         cm.on('paste', (cm, event) => {
 208             const clipboardItems = event.clipboardData.items;
 209             if (!event.clipboardData || !clipboardItems) return;
 210
 211             // Don't handle if clipboard includes text content
 212             for (let clipboardItem of clipboardItems) {
 213                 if (clipboardItem.type.includes('text/')) {
 214                     return;
 215                 }
 216             }
 217
 218             for (let clipboardItem of clipboardItems) {
 219                 if (clipboardItem.type.includes("image")) {
 220                     uploadImage(clipboardItem.getAsFile());
 221                 }
 222             }
 223         });
 224
 225         // Handle images on drag-drop
 226         cm.on('drop', (cm, event) => {
 227             event.stopPropagation();
 228             event.preventDefault();
 229             let cursorPos = cm.coordsChar({left: event.pageX, top: event.pageY});
 230             cm.setCursor(cursorPos);
 231             if (!event.dataTransfer || !event.dataTransfer.files) return;
 232             for (let i = 0; i < event.dataTransfer.files.length; i++) {
 233                 uploadImage(event.dataTransfer.files[i]);
 234             }
 235         });
 236
 237         // Helper to replace editor content
 238         function replaceContent(search, replace) {
 239             let text = cm.getValue();
 240             let cursor = cm.listSelections();
 241             cm.setValue(text.replace(search, replace));
 242             cm.setSelections(cursor);
 243         }
 244
 245         // Helper to replace the start of the line
 246         function replaceLineStart(newStart) {
 247             let cursor = cm.getCursor();
 248             let lineContent = cm.getLine(cursor.line);
 249             let lineLen = lineContent.length;
 250             let lineStart = lineContent.split(' ')[0];
 251
 252             // Remove symbol if already set
 253             if (lineStart === newStart) {
 254                 lineContent = lineContent.replace(`${newStart} `, '');
 255                 cm.replaceRange(lineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
 256                 cm.setCursor({line: cursor.line, ch: cursor.ch - (newStart.length + 1)});
 257                 return;
 258             }
 259
 260             let alreadySymbol = /^[#>`]/.test(lineStart);
 261             let posDif = 0;
 262             if (alreadySymbol) {
 263                 posDif = newStart.length - lineStart.length;
 264                 lineContent = lineContent.replace(lineStart, newStart).trim();
 265             } else if (newStart !== '') {
 266                 posDif = newStart.length + 1;
 267                 lineContent = newStart + ' ' + lineContent;
 268             }
 269             cm.replaceRange(lineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
 270             cm.setCursor({line: cursor.line, ch: cursor.ch + posDif});
 271         }
 272
 273         function wrapLine(start, end) {
 274             let cursor = cm.getCursor();
 275             let lineContent = cm.getLine(cursor.line);
 276             let lineLen = lineContent.length;
 277             let newLineContent = lineContent;
 278
 279             if (lineContent.indexOf(start) === 0 && lineContent.slice(-end.length) === end) {
 280                 newLineContent = lineContent.slice(start.length, lineContent.length - end.length);
 281             } else {
 282                 newLineContent = `${start}${lineContent}${end}`;
 283             }
 284
 285             cm.replaceRange(newLineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
 286             cm.setCursor({line: cursor.line, ch: cursor.ch + start.length});
 287         }
 288
 289         function wrapSelection(start, end) {
 290             let selection = cm.getSelection();
 291             if (selection === '') return wrapLine(start, end);
 292
 293             let newSelection = selection;
 294             let frontDiff = 0;
 295             let endDiff = 0;
 296
 297             if (selection.indexOf(start) === 0 && selection.slice(-end.length) === end) {
 298                 newSelection = selection.slice(start.length, selection.length - end.length);
 299                 endDiff = -(end.length + start.length);
 300             } else {
 301                 newSelection = `${start}${selection}${end}`;
 302                 endDiff = start.length + end.length;
 303             }
 304
 305             let selections = cm.listSelections()[0];
 306             cm.replaceSelection(newSelection);
 307             let headFirst = selections.head.ch <= selections.anchor.ch;
 308             selections.head.ch += headFirst ? frontDiff : endDiff;
 309             selections.anchor.ch += headFirst ? endDiff : frontDiff;
 310             cm.setSelections([selections]);
 311         }
 312
 313         // Handle image upload and add image into markdown content
 314         function uploadImage(file) {
 315             if (file === null || file.type.indexOf('image') !== 0) return;
 316             let ext = 'png';
 317
 318             if (file.name) {
 319                 let fileNameMatches = file.name.match(/\.(.+)$/);
 320                 if (fileNameMatches.length > 1) ext = fileNameMatches[1];
 321             }
 322
 323             // Insert image into markdown
 324             const id = "image-" + Math.random().toString(16).slice(2);
 325             const placeholderImage = window.baseUrl(`/loading.gif#upload${id}`);
 326             const selectedText = cm.getSelection();
 327             const placeHolderText = `![${selectedText}](${placeholderImage})`;
 328             const cursor = cm.getCursor();
 329             cm.replaceSelection(placeHolderText);
 330             cm.setCursor({line: cursor.line, ch: cursor.ch + selectedText.length + 3});
 331
 332             const remoteFilename = "image-" + Date.now() + "." + ext;
 333             const formData = new FormData();
 334             formData.append('file', file, remoteFilename);
 335             formData.append('uploaded_to', context.pageId);
 336
 337             window.$http.post('/images/gallery', formData).then(resp => {
 338                 const newContent = `[![${selectedText}](${resp.data.thumbs.display})](${resp.data.url})`;
 339                 replaceContent(placeHolderText, newContent);
 340             }).catch(err => {
 341                 window.$events.emit('error', trans('errors.image_upload_error'));
 342                 replaceContent(placeHolderText, selectedText);
 343                 console.log(err);
 344             });
 345         }
 346
 347         function insertLink() {
 348             let cursorPos = cm.getCursor('from');
 349             let selectedText = cm.getSelection() || '';
 350             let newText = `[${selectedText}]()`;
 351             cm.focus();
 352             cm.replaceSelection(newText);
 353             let cursorPosDiff = (selectedText === '') ? -3 : -1;
 354             cm.setCursor(cursorPos.line, cursorPos.ch + newText.length+cursorPosDiff);
 355         }
 356
 357        this.updateAndRender();
 358     }
 359
 360     actionInsertImage() {
 361         const cursorPos = this.cm.getCursor('from');
 362         window.ImageManager.show(image => {
 363             let selectedText = this.cm.getSelection();
 364             let newText = "[![" + (selectedText || image.name) + "](" + image.thumbs.display + ")](" + image.url + ")";
 365             this.cm.focus();
 366             this.cm.replaceSelection(newText);
 367             this.cm.setCursor(cursorPos.line, cursorPos.ch + newText.length);
 368         }, 'gallery');
 369     }
 370
 371     actionShowImageManager() {
 372         const cursorPos = this.cm.getCursor('from');
 373         window.ImageManager.show(image => {
 374             this.insertDrawing(image, cursorPos);
 375         }, 'drawio');
 376     }
 377
 378     // Show the popup link selector and insert a link when finished
 379     actionShowLinkSelector() {
 380         const cursorPos = this.cm.getCursor('from');
 381         window.EntitySelectorPopup.show(entity => {
 382             let selectedText = this.cm.getSelection() || entity.name;
 383             let newText = `[${selectedText}](${entity.link})`;
 384             this.cm.focus();
 385             this.cm.replaceSelection(newText);
 386             this.cm.setCursor(cursorPos.line, cursorPos.ch + newText.length);
 387         });
 388     }
 389
 390     // Show draw.io if enabled and handle save.
 391     actionStartDrawing() {
 392         if (document.querySelector('[drawio-enabled]').getAttribute('drawio-enabled') !== 'true') return;
 393         let cursorPos = this.cm.getCursor('from');
 394
 395         DrawIO.show(() => {
 396             return Promise.resolve('');
 397         }, (pngData) => {
 398             // let id = "image-" + Math.random().toString(16).slice(2);
 399             // let loadingImage = window.baseUrl('/loading.gif');
 400             let data = {
 401                 image: pngData,
 402                 uploaded_to: Number(document.getElementById('page-editor').getAttribute('page-id'))
 403             };
 404
 405             window.$http.post(window.baseUrl('/images/drawio'), data).then(resp => {
 406                 this.insertDrawing(resp.data, cursorPos);
 407                 DrawIO.close();
 408             }).catch(err => {
 409                 window.$events.emit('error', trans('errors.image_upload_error'));
 410                 console.log(err);
 411             });
 412         });
 413     }
 414
 415     insertDrawing(image, originalCursor) {
 416         const newText = `<div drawio-diagram="${image.id}"><img src="${image.url}"></div>`;
 417         this.cm.focus();
 418         this.cm.replaceSelection(newText);
 419         this.cm.setCursor(originalCursor.line, originalCursor.ch + newText.length);
 420     }
 421
 422     // Show draw.io if enabled and handle save.
 423     actionEditDrawing(imgContainer) {
 424         const drawingDisabled = document.querySelector('[drawio-enabled]').getAttribute('drawio-enabled') !== 'true';
 425         if (drawingDisabled) {
 426             return;
 427         }
 428
 429         const cursorPos = this.cm.getCursor('from');
 430         const drawingId = imgContainer.getAttribute('drawio-diagram');
 431
 432         DrawIO.show(() => {
 433             return DrawIO.load(drawingId);
 434         }, (pngData) => {
 435
 436             let data = {
 437                 image: pngData,
 438                 uploaded_to: Number(document.getElementById('page-editor').getAttribute('page-id'))
 439             };
 440
 441             window.$http.post(window.baseUrl(`/images/drawio`), data).then(resp => {
 442                 let newText = `<div drawio-diagram="${resp.data.id}"><img src="${resp.data.url}"></div>`;
 443                 let newContent = this.cm.getValue().split('\n').map(line => {
 444                     if (line.indexOf(`drawio-diagram="${drawingId}"`) !== -1) {
 445                         return newText;
 446                     }
 447                     return line;
 448                 }).join('\n');
 449                 this.cm.setValue(newContent);
 450                 this.cm.setCursor(cursorPos);
 451                 this.cm.focus();
 452                 DrawIO.close();
 453             }).catch(err => {
 454                 window.$events.emit('error', trans('errors.image_upload_error'));
 455                 console.log(err);
 456             });
 457         });
 458     }
 459
 460     // Scroll to a specified text
 461     scrollToText(searchText) {
 462         if (!searchText) {
 463             return;
 464         }
 465
 466         const content = this.cm.getValue();
 467         const lines = content.split(/\r?\n/);
 468         let lineNumber = lines.findIndex(line => {
 469             return line && line.indexOf(searchText) !== -1;
 470         });
 471
 472         if (lineNumber === -1) {
 473             return;
 474         }
 475
 476         this.cm.scrollIntoView({
 477             line: lineNumber,
 478         }, 200);
 479         this.cm.focus();
 480         // set the cursor location.
 481         this.cm.setCursor({
 482             line: lineNumber,
 483             char: lines[lineNumber].length
 484         })
 485     }
 486
 487     listenForBookStackEditorEvents() {
 488
 489         function getContentToInsert({html, markdown}) {
 490             return markdown || html;
 491         }
 492
 493         // Replace editor content
 494         window.$events.listen('editor::replace', (eventContent) => {
 495             const markdown = getContentToInsert(eventContent);
 496             this.cm.setValue(markdown);
 497         });
 498
 499         // Append editor content
 500         window.$events.listen('editor::append', (eventContent) => {
 501             const cursorPos = this.cm.getCursor('from');
 502             const markdown = getContentToInsert(eventContent);
 503             const content = this.cm.getValue() + '\n' + markdown;
 504             this.cm.setValue(content);
 505             this.cm.setCursor(cursorPos.line, cursorPos.ch);
 506         });
 507
 508         // Prepend editor content
 509         window.$events.listen('editor::prepend', (eventContent) => {
 510             const cursorPos = this.cm.getCursor('from');
 511             const markdown = getContentToInsert(eventContent);
 512             const content = markdown + '\n' + this.cm.getValue();
 513             this.cm.setValue(content);
 514             const prependLineCount = markdown.split('\n').length;
 515             this.cm.setCursor(cursorPos.line + prependLineCount, cursorPos.ch);
 516         });
 517     }
 518 }
 519
 520 export default MarkdownEditor ;