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
   5 import DrawIO from "../services/drawio";
   6
   7 class MarkdownEditor {
   8
   9     constructor(elem) {
  10         this.elem = elem;
  11
  12         const pageEditor = document.getElementById('page-editor');
  13         this.pageId = pageEditor.getAttribute('page-id');
  14         this.textDirection = pageEditor.getAttribute('text-direction');
  15
  16         this.markdown = new MarkdownIt({html: true});
  17         this.markdown.use(mdTasksLists, {label: true});
  18
  19         this.display = this.elem.querySelector('.markdown-display');
  20         this.input = this.elem.querySelector('textarea');
  21         this.htmlInput = this.elem.querySelector('input[name=html]');
  22         this.cm = code.markdownEditor(this.input);
  23
  24         this.onMarkdownScroll = this.onMarkdownScroll.bind(this);
  25         this.init();
  26
  27         // Scroll to text if needed.
  28         const queryParams = (new URL(window.location)).searchParams;
  29         const scrollText = queryParams.get('content-text');
  30         if (scrollText) {
  31             this.scrollToText(scrollText);
  32         }
  33     }
  34
  35     init() {
  36
  37         let lastClick = 0;
  38
  39         // Prevent markdown display link click redirect
  40         this.display.addEventListener('click', event => {
  41             let isDblClick = Date.now() - lastClick < 300;
  42
  43             let link = event.target.closest('a');
  44             if (link !== null) {
  45                 event.preventDefault();
  46                 window.open(link.getAttribute('href'));
  47                 return;
  48             }
  49
  50             let drawing = event.target.closest('[drawio-diagram]');
  51             if (drawing !== null && isDblClick) {
  52                 this.actionEditDrawing(drawing);
  53                 return;
  54             }
  55
  56             lastClick = Date.now();
  57         });
  58
  59         // Button actions
  60         this.elem.addEventListener('click', event => {
  61             let button = event.target.closest('button[data-action]');
  62             if (button === null) return;
  63
  64             let action = button.getAttribute('data-action');
  65             if (action === 'insertImage') this.actionInsertImage();
  66             if (action === 'insertLink') this.actionShowLinkSelector();
  67             if (action === 'insertDrawing' && event.ctrlKey) {
  68                 this.actionShowImageManager();
  69                 return;
  70             }
  71             if (action === 'insertDrawing') this.actionStartDrawing();
  72         });
  73
  74         // Mobile section toggling
  75         this.elem.addEventListener('click', event => {
  76             const toolbarLabel = event.target.closest('.editor-toolbar-label');
  77             if (!toolbarLabel) return;
  78
  79             const currentActiveSections = this.elem.querySelectorAll('.markdown-editor-wrap');
  80             for (let activeElem of currentActiveSections) {
  81                 activeElem.classList.remove('active');
  82             }
  83
  84             toolbarLabel.closest('.markdown-editor-wrap').classList.add('active');
  85         });
  86
  87         window.$events.listen('editor-markdown-update', value => {
  88             this.cm.setValue(value);
  89             this.updateAndRender();
  90         });
  91
  92         this.codeMirrorSetup();
  93     }
  94
  95     // Update the input content and render the display.
  96     updateAndRender() {
  97         let content = this.cm.getValue();
  98         this.input.value = content;
  99         let html = this.markdown.render(content);
 100         window.$events.emit('editor-html-change', html);
 101         window.$events.emit('editor-markdown-change', content);
 102         this.display.innerHTML = html;
 103         this.htmlInput.value = html;
 104     }
 105
 106     onMarkdownScroll(lineCount) {
 107         let elems = this.display.children;
 108         if (elems.length <= lineCount) return;
 109
 110         let topElem = (lineCount === -1) ? elems[elems.length-1] : elems[lineCount];
 111         // TODO - Replace jQuery
 112         $(this.display).animate({
 113             scrollTop: topElem.offsetTop
 114         }, {queue: false, duration: 200, easing: 'linear'});
 115     }
 116
 117     codeMirrorSetup() {
 118         const cm = this.cm;
 119         const context = this;
 120
 121         // Text direction
 122         // cm.setOption('direction', this.textDirection);
 123         cm.setOption('direction', 'ltr'); // Will force to remain as ltr for now due to issues when HTML is in editor.
 124         // Custom key commands
 125         let metaKey = code.getMetaKey();
 126         const extraKeys = {};
 127         // Insert Image shortcut
 128         extraKeys[`${metaKey}-Alt-I`] = function(cm) {
 129             let selectedText = cm.getSelection();
 130             let newText = `![${selectedText}](http://)`;
 131             let cursorPos = cm.getCursor('from');
 132             cm.replaceSelection(newText);
 133             cm.setCursor(cursorPos.line, cursorPos.ch + newText.length -1);
 134         };
 135         // Save draft
 136         extraKeys[`${metaKey}-S`] = cm => {window.$events.emit('editor-save-draft')};
 137         // Save page
 138         extraKeys[`${metaKey}-Enter`] = cm => {window.$events.emit('editor-save-page')};
 139         // Show link selector
 140         extraKeys[`Shift-${metaKey}-K`] = cm => {this.actionShowLinkSelector()};
 141         // Insert Link
 142         extraKeys[`${metaKey}-K`] = cm => {insertLink()};
 143         // FormatShortcuts
 144         extraKeys[`${metaKey}-1`] = cm => {replaceLineStart('##');};
 145         extraKeys[`${metaKey}-2`] = cm => {replaceLineStart('###');};
 146         extraKeys[`${metaKey}-3`] = cm => {replaceLineStart('####');};
 147         extraKeys[`${metaKey}-4`] = cm => {replaceLineStart('#####');};
 148         extraKeys[`${metaKey}-5`] = cm => {replaceLineStart('');};
 149         extraKeys[`${metaKey}-d`] = cm => {replaceLineStart('');};
 150         extraKeys[`${metaKey}-6`] = cm => {replaceLineStart('>');};
 151         extraKeys[`${metaKey}-q`] = cm => {replaceLineStart('>');};
 152         extraKeys[`${metaKey}-7`] = cm => {wrapSelection('\n```\n', '\n```');};
 153         extraKeys[`${metaKey}-8`] = cm => {wrapSelection('`', '`');};
 154         extraKeys[`Shift-${metaKey}-E`] = cm => {wrapSelection('`', '`');};
 155         extraKeys[`${metaKey}-9`] = cm => {wrapSelection('<p class="callout info">', '</p>');};
 156         cm.setOption('extraKeys', extraKeys);
 157
 158         // Update data on content change
 159         cm.on('change', (instance, changeObj) => {
 160             this.updateAndRender();
 161         });
 162
 163         // Handle scroll to sync display view
 164         cm.on('scroll', instance => {
 165             // Thanks to http://liuhao.im/english/2015/11/10/the-sync-scroll-of-markdown-editor-in-javascript.html
 166             let scroll = instance.getScrollInfo();
 167             let atEnd = scroll.top + scroll.clientHeight === scroll.height;
 168             if (atEnd) {
 169                 this.onMarkdownScroll(-1);
 170                 return;
 171             }
 172
 173             let lineNum = instance.lineAtHeight(scroll.top, 'local');
 174             let range = instance.getRange({line: 0, ch: null}, {line: lineNum, ch: null});
 175             let parser = new DOMParser();
 176             let doc = parser.parseFromString(this.markdown.render(range), 'text/html');
 177             let totalLines = doc.documentElement.querySelectorAll('body > *');
 178             this.onMarkdownScroll(totalLines.length);
 179         });
 180
 181         // Handle image paste
 182         cm.on('paste', (cm, event) => {
 183             if (!event.clipboardData || !event.clipboardData.items) return;
 184             for (let i = 0; i < event.clipboardData.items.length; i++) {
 185                 uploadImage(event.clipboardData.items[i].getAsFile());
 186             }
 187         });
 188
 189         // Handle images on drag-drop
 190         cm.on('drop', (cm, event) => {
 191             event.stopPropagation();
 192             event.preventDefault();
 193             let cursorPos = cm.coordsChar({left: event.pageX, top: event.pageY});
 194             cm.setCursor(cursorPos);
 195             if (!event.dataTransfer || !event.dataTransfer.files) return;
 196             for (let i = 0; i < event.dataTransfer.files.length; i++) {
 197                 uploadImage(event.dataTransfer.files[i]);
 198             }
 199         });
 200
 201         // Helper to replace editor content
 202         function replaceContent(search, replace) {
 203             let text = cm.getValue();
 204             let cursor = cm.listSelections();
 205             cm.setValue(text.replace(search, replace));
 206             cm.setSelections(cursor);
 207         }
 208
 209         // Helper to replace the start of the line
 210         function replaceLineStart(newStart) {
 211             let cursor = cm.getCursor();
 212             let lineContent = cm.getLine(cursor.line);
 213             let lineLen = lineContent.length;
 214             let lineStart = lineContent.split(' ')[0];
 215
 216             // Remove symbol if already set
 217             if (lineStart === newStart) {
 218                 lineContent = lineContent.replace(`${newStart} `, '');
 219                 cm.replaceRange(lineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
 220                 cm.setCursor({line: cursor.line, ch: cursor.ch - (newStart.length + 1)});
 221                 return;
 222             }
 223
 224             let alreadySymbol = /^[#>`]/.test(lineStart);
 225             let posDif = 0;
 226             if (alreadySymbol) {
 227                 posDif = newStart.length - lineStart.length;
 228                 lineContent = lineContent.replace(lineStart, newStart).trim();
 229             } else if (newStart !== '') {
 230                 posDif = newStart.length + 1;
 231                 lineContent = newStart + ' ' + lineContent;
 232             }
 233             cm.replaceRange(lineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
 234             cm.setCursor({line: cursor.line, ch: cursor.ch + posDif});
 235         }
 236
 237         function wrapLine(start, end) {
 238             let cursor = cm.getCursor();
 239             let lineContent = cm.getLine(cursor.line);
 240             let lineLen = lineContent.length;
 241             let newLineContent = lineContent;
 242
 243             if (lineContent.indexOf(start) === 0 && lineContent.slice(-end.length) === end) {
 244                 newLineContent = lineContent.slice(start.length, lineContent.length - end.length);
 245             } else {
 246                 newLineContent = `${start}${lineContent}${end}`;
 247             }
 248
 249             cm.replaceRange(newLineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
 250             cm.setCursor({line: cursor.line, ch: cursor.ch + start.length});
 251         }
 252
 253         function wrapSelection(start, end) {
 254             let selection = cm.getSelection();
 255             if (selection === '') return wrapLine(start, end);
 256
 257             let newSelection = selection;
 258             let frontDiff = 0;
 259             let endDiff = 0;
 260
 261             if (selection.indexOf(start) === 0 && selection.slice(-end.length) === end) {
 262                 newSelection = selection.slice(start.length, selection.length - end.length);
 263                 endDiff = -(end.length + start.length);
 264             } else {
 265                 newSelection = `${start}${selection}${end}`;
 266                 endDiff = start.length + end.length;
 267             }
 268
 269             let selections = cm.listSelections()[0];
 270             cm.replaceSelection(newSelection);
 271             let headFirst = selections.head.ch <= selections.anchor.ch;
 272             selections.head.ch += headFirst ? frontDiff : endDiff;
 273             selections.anchor.ch += headFirst ? endDiff : frontDiff;
 274             cm.setSelections([selections]);
 275         }
 276
 277         // Handle image upload and add image into markdown content
 278         function uploadImage(file) {
 279             if (file === null || file.type.indexOf('image') !== 0) return;
 280             let ext = 'png';
 281
 282             if (file.name) {
 283                 let fileNameMatches = file.name.match(/\.(.+)$/);
 284                 if (fileNameMatches.length > 1) ext = fileNameMatches[1];
 285             }
 286
 287             // Insert image into markdown
 288             const id = "image-" + Math.random().toString(16).slice(2);
 289             const placeholderImage = window.baseUrl(`/loading.gif#upload${id}`);
 290             const selectedText = cm.getSelection();
 291             const placeHolderText = `![${selectedText}](${placeholderImage})`;
 292             const cursor = cm.getCursor();
 293             cm.replaceSelection(placeHolderText);
 294             cm.setCursor({line: cursor.line, ch: cursor.ch + selectedText.length + 3});
 295
 296             const remoteFilename = "image-" + Date.now() + "." + ext;
 297             const formData = new FormData();
 298             formData.append('file', file, remoteFilename);
 299             formData.append('uploaded_to', context.pageId);
 300
 301             window.$http.post('/images/gallery/upload', formData).then(resp => {
 302                 const newContent = `[![${selectedText}](${resp.data.thumbs.display})](${resp.data.url})`;
 303                 replaceContent(placeHolderText, newContent);
 304             }).catch(err => {
 305                 window.$events.emit('error', trans('errors.image_upload_error'));
 306                 replaceContent(placeHolderText, selectedText);
 307                 console.log(err);
 308             });
 309         }
 310
 311         function insertLink() {
 312             let cursorPos = cm.getCursor('from');
 313             let selectedText = cm.getSelection() || '';
 314             let newText = `[${selectedText}]()`;
 315             cm.focus();
 316             cm.replaceSelection(newText);
 317             let cursorPosDiff = (selectedText === '') ? -3 : -1;
 318             cm.setCursor(cursorPos.line, cursorPos.ch + newText.length+cursorPosDiff);
 319         }
 320
 321        this.updateAndRender();
 322     }
 323
 324     actionInsertImage() {
 325         const cursorPos = this.cm.getCursor('from');
 326         window.ImageManager.show(image => {
 327             let selectedText = this.cm.getSelection();
 328             let newText = "[![" + (selectedText || image.name) + "](" + image.thumbs.display + ")](" + image.url + ")";
 329             this.cm.focus();
 330             this.cm.replaceSelection(newText);
 331             this.cm.setCursor(cursorPos.line, cursorPos.ch + newText.length);
 332         }, 'gallery');
 333     }
 334
 335     actionShowImageManager() {
 336         const cursorPos = this.cm.getCursor('from');
 337         window.ImageManager.show(image => {
 338             this.insertDrawing(image, cursorPos);
 339         }, 'drawio');
 340     }
 341
 342     // Show the popup link selector and insert a link when finished
 343     actionShowLinkSelector() {
 344         const cursorPos = this.cm.getCursor('from');
 345         window.EntitySelectorPopup.show(entity => {
 346             let selectedText = this.cm.getSelection() || entity.name;
 347             let newText = `[${selectedText}](${entity.link})`;
 348             this.cm.focus();
 349             this.cm.replaceSelection(newText);
 350             this.cm.setCursor(cursorPos.line, cursorPos.ch + newText.length);
 351         });
 352     }
 353
 354     // Show draw.io if enabled and handle save.
 355     actionStartDrawing() {
 356         if (document.querySelector('[drawio-enabled]').getAttribute('drawio-enabled') !== 'true') return;
 357         let cursorPos = this.cm.getCursor('from');
 358
 359         DrawIO.show(() => {
 360             return Promise.resolve('');
 361         }, (pngData) => {
 362             // let id = "image-" + Math.random().toString(16).slice(2);
 363             // let loadingImage = window.baseUrl('/loading.gif');
 364             let data = {
 365                 image: pngData,
 366                 uploaded_to: Number(document.getElementById('page-editor').getAttribute('page-id'))
 367             };
 368
 369             window.$http.post(window.baseUrl('/images/drawing/upload'), data).then(resp => {
 370                 this.insertDrawing(resp.data, cursorPos);
 371                 DrawIO.close();
 372             }).catch(err => {
 373                 window.$events.emit('error', trans('errors.image_upload_error'));
 374                 console.log(err);
 375             });
 376         });
 377     }
 378
 379     insertDrawing(image, originalCursor) {
 380         const newText = `<div drawio-diagram="${image.id}"><img src="${image.url}"></div>`;
 381         this.cm.focus();
 382         this.cm.replaceSelection(newText);
 383         this.cm.setCursor(originalCursor.line, originalCursor.ch + newText.length);
 384     }
 385
 386     // Show draw.io if enabled and handle save.
 387     actionEditDrawing(imgContainer) {
 388         const drawingDisabled = document.querySelector('[drawio-enabled]').getAttribute('drawio-enabled') !== 'true';
 389         if (drawingDisabled) {
 390             return;
 391         }
 392
 393         const cursorPos = this.cm.getCursor('from');
 394         const drawingId = imgContainer.getAttribute('drawio-diagram');
 395
 396         DrawIO.show(() => {
 397             return window.$http.get(window.baseUrl(`/images/base64/${drawingId}`)).then(resp => {
 398                 return `data:image/png;base64,${resp.data.content}`;
 399             });
 400         }, (pngData) => {
 401
 402             let data = {
 403                 image: pngData,
 404                 uploaded_to: Number(document.getElementById('page-editor').getAttribute('page-id'))
 405             };
 406
 407             window.$http.post(window.baseUrl(`/images/drawing/upload`), data).then(resp => {
 408                 let newText = `<div drawio-diagram="${resp.data.id}"><img src="${resp.data.url}"></div>`;
 409                 let newContent = this.cm.getValue().split('\n').map(line => {
 410                     if (line.indexOf(`drawio-diagram="${drawingId}"`) !== -1) {
 411                         return newText;
 412                     }
 413                     return line;
 414                 }).join('\n');
 415                 this.cm.setValue(newContent);
 416                 this.cm.setCursor(cursorPos);
 417                 this.cm.focus();
 418                 DrawIO.close();
 419             }).catch(err => {
 420                 window.$events.emit('error', trans('errors.image_upload_error'));
 421                 console.log(err);
 422             });
 423         });
 424     }
 425
 426     // Scroll to a specified text
 427     scrollToText(searchText) {
 428         if (!searchText) {
 429             return;
 430         }
 431
 432         const content = this.cm.getValue();
 433         const lines = content.split(/\r?\n/);
 434         let lineNumber = lines.findIndex(line => {
 435             return line && line.indexOf(searchText) !== -1;
 436         });
 437
 438         if (lineNumber === -1) {
 439             return;
 440         }
 441
 442         this.cm.scrollIntoView({
 443             line: lineNumber,
 444         }, 200);
 445         this.cm.focus();
 446         // set the cursor location.
 447         this.cm.setCursor({
 448             line: lineNumber,
 449             char: lines[lineNumber].length
 450         })
 451     }
 452
 453 }
 454
 455 export default MarkdownEditor ;