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

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