BookStack/resources/assets/js/components/markdown-editor.js

375 lines
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JavaScript
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const MarkdownIt = require("markdown-it");
const mdTasksLists = require('markdown-it-task-lists');
const code = require('../libs/code');
const DrawIO = require('../libs/drawio');
class MarkdownEditor {
constructor(elem) {
this.elem = elem;
this.markdown = new MarkdownIt({html: true});
this.markdown.use(mdTasksLists, {label: true});
this.display = this.elem.querySelector('.markdown-display');
this.input = this.elem.querySelector('textarea');
this.htmlInput = this.elem.querySelector('input[name=html]');
this.cm = code.markdownEditor(this.input);
this.onMarkdownScroll = this.onMarkdownScroll.bind(this);
this.init();
}
init() {
let lastClick = 0;
// Prevent markdown display link click redirect
this.display.addEventListener('click', event => {
let isDblClick = Date.now() - lastClick < 300;
let link = event.target.closest('a');
if (link !== null) {
event.preventDefault();
window.open(link.getAttribute('href'));
return;
}
let drawing = event.target.closest('[drawio-diagram]');
if (drawing !== null && isDblClick) {
this.actionEditDrawing(drawing);
return;
}
lastClick = Date.now();
});
// Button actions
this.elem.addEventListener('click', event => {
let button = event.target.closest('button[data-action]');
if (button === null) return;
let action = button.getAttribute('data-action');
if (action === 'insertImage') this.actionInsertImage();
if (action === 'insertLink') this.actionShowLinkSelector();
if (action === 'insertDrawing') this.actionStartDrawing();
});
window.$events.listen('editor-markdown-update', value => {
this.cm.setValue(value);
this.updateAndRender();
});
this.codeMirrorSetup();
}
// Update the input content and render the display.
updateAndRender() {
let content = this.cm.getValue();
this.input.value = content;
let html = this.markdown.render(content);
window.$events.emit('editor-html-change', html);
window.$events.emit('editor-markdown-change', content);
this.display.innerHTML = html;
this.htmlInput.value = html;
}
onMarkdownScroll(lineCount) {
let elems = this.display.children;
if (elems.length <= lineCount) return;
let topElem = (lineCount === -1) ? elems[elems.length-1] : elems[lineCount];
// TODO - Replace jQuery
$(this.display).animate({
scrollTop: topElem.offsetTop
}, {queue: false, duration: 200, easing: 'linear'});
}
codeMirrorSetup() {
let cm = this.cm;
// Custom key commands
let metaKey = code.getMetaKey();
const extraKeys = {};
// Insert Image shortcut
extraKeys[`${metaKey}-Alt-I`] = function(cm) {
let selectedText = cm.getSelection();
let newText = `![${selectedText}](http://)`;
let cursorPos = cm.getCursor('from');
cm.replaceSelection(newText);
cm.setCursor(cursorPos.line, cursorPos.ch + newText.length -1);
};
// Save draft
extraKeys[`${metaKey}-S`] = cm => {window.$events.emit('editor-save-draft')};
// Save page
extraKeys[`${metaKey}-Enter`] = cm => {window.$events.emit('editor-save-page')};
// Show link selector
extraKeys[`Shift-${metaKey}-K`] = cm => {this.actionShowLinkSelector()};
// Insert Link
extraKeys[`${metaKey}-K`] = cm => {insertLink()};
// FormatShortcuts
extraKeys[`${metaKey}-1`] = cm => {replaceLineStart('##');};
extraKeys[`${metaKey}-2`] = cm => {replaceLineStart('###');};
extraKeys[`${metaKey}-3`] = cm => {replaceLineStart('####');};
extraKeys[`${metaKey}-4`] = cm => {replaceLineStart('#####');};
extraKeys[`${metaKey}-5`] = cm => {replaceLineStart('');};
extraKeys[`${metaKey}-d`] = cm => {replaceLineStart('');};
extraKeys[`${metaKey}-6`] = cm => {replaceLineStart('>');};
extraKeys[`${metaKey}-q`] = cm => {replaceLineStart('>');};
extraKeys[`${metaKey}-7`] = cm => {wrapSelection('\n```\n', '\n```');};
extraKeys[`${metaKey}-8`] = cm => {wrapSelection('`', '`');};
extraKeys[`Shift-${metaKey}-E`] = cm => {wrapSelection('`', '`');};
extraKeys[`${metaKey}-9`] = cm => {wrapSelection('<p class="callout info">', '</p>');};
cm.setOption('extraKeys', extraKeys);
// Update data on content change
cm.on('change', (instance, changeObj) => {
this.updateAndRender();
});
// Handle scroll to sync display view
cm.on('scroll', instance => {
// Thanks to http://liuhao.im/english/2015/11/10/the-sync-scroll-of-markdown-editor-in-javascript.html
let scroll = instance.getScrollInfo();
let atEnd = scroll.top + scroll.clientHeight === scroll.height;
if (atEnd) {
this.onMarkdownScroll(-1);
return;
}
let lineNum = instance.lineAtHeight(scroll.top, 'local');
let range = instance.getRange({line: 0, ch: null}, {line: lineNum, ch: null});
let parser = new DOMParser();
let doc = parser.parseFromString(this.markdown.render(range), 'text/html');
let totalLines = doc.documentElement.querySelectorAll('body > *');
this.onMarkdownScroll(totalLines.length);
});
// Handle image paste
cm.on('paste', (cm, event) => {
if (!event.clipboardData || !event.clipboardData.items) return;
for (let i = 0; i < event.clipboardData.items.length; i++) {
uploadImage(event.clipboardData.items[i].getAsFile());
}
});
// Handle images on drag-drop
cm.on('drop', (cm, event) => {
event.stopPropagation();
event.preventDefault();
let cursorPos = cm.coordsChar({left: event.pageX, top: event.pageY});
cm.setCursor(cursorPos);
if (!event.dataTransfer || !event.dataTransfer.files) return;
for (let i = 0; i < event.dataTransfer.files.length; i++) {
uploadImage(event.dataTransfer.files[i]);
}
});
// Helper to replace editor content
function replaceContent(search, replace) {
let text = cm.getValue();
let cursor = cm.listSelections();
cm.setValue(text.replace(search, replace));
cm.setSelections(cursor);
}
// Helper to replace the start of the line
function replaceLineStart(newStart) {
let cursor = cm.getCursor();
let lineContent = cm.getLine(cursor.line);
let lineLen = lineContent.length;
let lineStart = lineContent.split(' ')[0];
// Remove symbol if already set
if (lineStart === newStart) {
lineContent = lineContent.replace(`${newStart} `, '');
cm.replaceRange(lineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
cm.setCursor({line: cursor.line, ch: cursor.ch - (newStart.length + 1)});
return;
}
let alreadySymbol = /^[#>`]/.test(lineStart);
let posDif = 0;
if (alreadySymbol) {
posDif = newStart.length - lineStart.length;
lineContent = lineContent.replace(lineStart, newStart).trim();
} else if (newStart !== '') {
posDif = newStart.length + 1;
lineContent = newStart + ' ' + lineContent;
}
cm.replaceRange(lineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
cm.setCursor({line: cursor.line, ch: cursor.ch + posDif});
}
function wrapLine(start, end) {
let cursor = cm.getCursor();
let lineContent = cm.getLine(cursor.line);
let lineLen = lineContent.length;
let newLineContent = lineContent;
if (lineContent.indexOf(start) === 0 && lineContent.slice(-end.length) === end) {
newLineContent = lineContent.slice(start.length, lineContent.length - end.length);
} else {
newLineContent = `${start}${lineContent}${end}`;
}
cm.replaceRange(newLineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
cm.setCursor({line: cursor.line, ch: cursor.ch + start.length});
}
function wrapSelection(start, end) {
let selection = cm.getSelection();
if (selection === '') return wrapLine(start, end);
let newSelection = selection;
let frontDiff = 0;
let endDiff = 0;
if (selection.indexOf(start) === 0 && selection.slice(-end.length) === end) {
newSelection = selection.slice(start.length, selection.length - end.length);
endDiff = -(end.length + start.length);
} else {
newSelection = `${start}${selection}${end}`;
endDiff = start.length + end.length;
}
let selections = cm.listSelections()[0];
cm.replaceSelection(newSelection);
let headFirst = selections.head.ch <= selections.anchor.ch;
selections.head.ch += headFirst ? frontDiff : endDiff;
selections.anchor.ch += headFirst ? endDiff : frontDiff;
cm.setSelections([selections]);
}
// Handle image upload and add image into markdown content
function uploadImage(file) {
if (file === null || file.type.indexOf('image') !== 0) return;
let ext = 'png';
if (file.name) {
let fileNameMatches = file.name.match(/\.(.+)$/);
if (fileNameMatches.length > 1) ext = fileNameMatches[1];
}
// Insert image into markdown
let id = "image-" + Math.random().toString(16).slice(2);
let placeholderImage = window.baseUrl(`/loading.gif#upload${id}`);
let selectedText = cm.getSelection();
let placeHolderText = `![${selectedText}](${placeholderImage})`;
cm.replaceSelection(placeHolderText);
let remoteFilename = "image-" + Date.now() + "." + ext;
let formData = new FormData();
formData.append('file', file, remoteFilename);
window.$http.post('/images/gallery/upload', formData).then(resp => {
replaceContent(placeholderImage, resp.data.thumbs.display);
}).catch(err => {
events.emit('error', trans('errors.image_upload_error'));
replaceContent(placeHolderText, selectedText);
console.log(err);
});
}
function insertLink() {
let cursorPos = cm.getCursor('from');
let selectedText = cm.getSelection() || '';
let newText = `[${selectedText}]()`;
cm.focus();
cm.replaceSelection(newText);
let cursorPosDiff = (selectedText === '') ? -3 : -1;
cm.setCursor(cursorPos.line, cursorPos.ch + newText.length+cursorPosDiff);
}
this.updateAndRender();
}
actionInsertImage() {
let cursorPos = this.cm.getCursor('from');
window.ImageManager.show(image => {
let selectedText = this.cm.getSelection();
let newText = "![" + (selectedText || image.name) + "](" + image.thumbs.display + ")";
this.cm.focus();
this.cm.replaceSelection(newText);
this.cm.setCursor(cursorPos.line, cursorPos.ch + newText.length);
});
}
// Show the popup link selector and insert a link when finished
actionShowLinkSelector() {
let cursorPos = this.cm.getCursor('from');
window.EntitySelectorPopup.show(entity => {
let selectedText = this.cm.getSelection() || entity.name;
let newText = `[${selectedText}](${entity.link})`;
this.cm.focus();
this.cm.replaceSelection(newText);
this.cm.setCursor(cursorPos.line, cursorPos.ch + newText.length);
});
}
// Show draw.io if enabled and handle save.
actionStartDrawing() {
if (document.querySelector('[drawio-enabled]').getAttribute('drawio-enabled') !== 'true') return;
let cursorPos = this.cm.getCursor('from');
DrawIO.show(() => {
return Promise.resolve('');
}, (pngData) => {
// let id = "image-" + Math.random().toString(16).slice(2);
// let loadingImage = window.baseUrl('/loading.gif');
let data = {
image: pngData,
uploaded_to: Number(document.getElementById('page-editor').getAttribute('page-id'))
};
window.$http.post(window.baseUrl('/images/drawing/upload'), data).then(resp => {
let newText = `<div drawio-diagram="${resp.data.id}"><img src="${resp.data.url}"></div>`;
this.cm.focus();
this.cm.replaceSelection(newText);
this.cm.setCursor(cursorPos.line, cursorPos.ch + newText.length);
DrawIO.close();
}).catch(err => {
window.$events.emit('error', trans('errors.image_upload_error'));
console.log(err);
});
});
}
// Show draw.io if enabled and handle save.
actionEditDrawing(imgContainer) {
if (document.querySelector('[drawio-enabled]').getAttribute('drawio-enabled') !== 'true') return;
let cursorPos = this.cm.getCursor('from');
let drawingId = imgContainer.getAttribute('drawio-diagram');
DrawIO.show(() => {
return window.$http.get(window.baseUrl(`/images/base64/${drawingId}`)).then(resp => {
return `data:image/png;base64,${resp.data.content}`;
});
}, (pngData) => {
let data = {
image: pngData,
uploaded_to: Number(document.getElementById('page-editor').getAttribute('page-id'))
};
window.$http.put(window.baseUrl(`/images/drawing/upload/${drawingId}`), data).then(resp => {
let newText = `<div drawio-diagram="${resp.data.id}"><img src="${resp.data.url + `?updated=${Date.now()}`}"></div>`;
let newContent = this.cm.getValue().split('\n').map(line => {
if (line.indexOf(`drawio-diagram="${drawingId}"`) !== -1) {
return newText;
}
return line;
}).join('\n');
this.cm.setValue(newContent);
this.cm.setCursor(cursorPos);
this.cm.focus();
DrawIO.close();
}).catch(err => {
window.$events.emit('error', trans('errors.image_upload_error'));
console.log(err);
});
});
}
}
module.exports = MarkdownEditor ;