BookStack/resources/js/components/markdown-editor.js
2019-09-06 23:36:16 +01:00

539 lines
21 KiB
JavaScript

import MarkdownIt from "markdown-it";
import mdTasksLists from 'markdown-it-task-lists';
import code from '../services/code';
import {debounce} from "../services/util";
import DrawIO from "../services/drawio";
class MarkdownEditor {
constructor(elem) {
this.elem = elem;
const pageEditor = document.getElementById('page-editor');
this.pageId = pageEditor.getAttribute('page-id');
this.textDirection = pageEditor.getAttribute('text-direction');
this.markdown = new MarkdownIt({html: true});
this.markdown.use(mdTasksLists, {label: true});
this.display = this.elem.querySelector('.markdown-display');
this.displayStylesLoaded = false;
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.display.addEventListener('load', () => {
this.displayDoc = this.display.contentDocument;
this.init();
});
}
init() {
let lastClick = 0;
// Prevent markdown display link click redirect
this.displayDoc.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' && (event.ctrlKey || event.metaKey)) {
this.actionShowImageManager();
return;
}
if (action === 'insertDrawing') this.actionStartDrawing();
});
// Mobile section toggling
this.elem.addEventListener('click', event => {
const toolbarLabel = event.target.closest('.editor-toolbar-label');
if (!toolbarLabel) return;
const currentActiveSections = this.elem.querySelectorAll('.markdown-editor-wrap');
for (let activeElem of currentActiveSections) {
activeElem.classList.remove('active');
}
toolbarLabel.closest('.markdown-editor-wrap').classList.add('active');
});
window.$events.listen('editor-markdown-update', value => {
this.cm.setValue(value);
this.updateAndRender();
});
this.codeMirrorSetup();
this.listenForBookStackEditorEvents();
// Scroll to text if needed.
const queryParams = (new URL(window.location)).searchParams;
const scrollText = queryParams.get('content-text');
if (scrollText) {
this.scrollToText(scrollText);
}
}
// Update the input content and render the display.
updateAndRender() {
const content = this.cm.getValue();
this.input.value = content;
const html = this.markdown.render(content);
window.$events.emit('editor-html-change', html);
window.$events.emit('editor-markdown-change', content);
// Set body content
this.displayDoc.body.className = 'page-content';
this.displayDoc.body.innerHTML = html;
this.htmlInput.value = html;
// Copy styles from page head and set custom styles for editor
this.loadStylesIntoDisplay();
}
loadStylesIntoDisplay() {
if (this.displayStylesLoaded) return;
this.displayDoc.documentElement.className = 'markdown-editor-display';
this.displayDoc.head.innerHTML = '';
const styles = document.head.querySelectorAll('style,link[rel=stylesheet]');
for (let style of styles) {
const copy = style.cloneNode(true);
this.displayDoc.head.appendChild(copy);
}
this.displayStylesLoaded = true;
}
onMarkdownScroll(lineCount) {
const elems = this.displayDoc.body.children;
if (elems.length <= lineCount) return;
const topElem = (lineCount === -1) ? elems[elems.length-1] : elems[lineCount];
topElem.scrollIntoView({ block: 'start', inline: 'nearest', behavior: 'smooth'});
}
codeMirrorSetup() {
const cm = this.cm;
const context = this;
// Text direction
// cm.setOption('direction', this.textDirection);
cm.setOption('direction', 'ltr'); // Will force to remain as ltr for now due to issues when HTML is in editor.
// Custom key commands
let metaKey = code.getMetaKey();
const extraKeys = {};
// Insert Image shortcut
extraKeys[`${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[`${metaKey}-9`] = cm => {wrapSelection('<p class="callout info">', '</p>');};
cm.setOption('extraKeys', extraKeys);
// Update data on content change
cm.on('change', (instance, changeObj) => {
this.updateAndRender();
});
const onScrollDebounced = debounce((instance) => {
// Thanks to http://liuhao.im/english/2015/11/10/the-sync-scroll-of-markdown-editor-in-javascript.html
let scroll = instance.getScrollInfo();
let atEnd = scroll.top + scroll.clientHeight === scroll.height;
if (atEnd) {
this.onMarkdownScroll(-1);
return;
}
let lineNum = instance.lineAtHeight(scroll.top, 'local');
let range = instance.getRange({line: 0, ch: null}, {line: lineNum, ch: null});
let parser = new DOMParser();
let doc = parser.parseFromString(this.markdown.render(range), 'text/html');
let totalLines = doc.documentElement.querySelectorAll('body > *');
this.onMarkdownScroll(totalLines.length);
}, 100);
// Handle scroll to sync display view
cm.on('scroll', instance => {
onScrollDebounced(instance);
});
// Handle image paste
cm.on('paste', (cm, event) => {
const clipboardItems = event.clipboardData.items;
if (!event.clipboardData || !clipboardItems) return;
// Don't handle if clipboard includes text content
for (let clipboardItem of clipboardItems) {
if (clipboardItem.type.includes('text/')) {
return;
}
}
for (let clipboardItem of clipboardItems) {
if (clipboardItem.type.includes("image")) {
uploadImage(clipboardItem.getAsFile());
}
}
});
// Handle image & content drag n drop
cm.on('drop', (cm, event) => {
const templateId = event.dataTransfer.getData('bookstack/template');
if (templateId) {
const cursorPos = cm.coordsChar({left: event.pageX, top: event.pageY});
cm.setCursor(cursorPos);
event.preventDefault();
window.$http.get(`/templates/${templateId}`).then(resp => {
const content = resp.data.markdown || resp.data.html;
cm.replaceSelection(content);
});
}
if (event.dataTransfer && event.dataTransfer.files && event.dataTransfer.files.length > 0) {
const cursorPos = cm.coordsChar({left: event.pageX, top: event.pageY});
cm.setCursor(cursorPos);
event.stopPropagation();
event.preventDefault();
for (let i = 0; i < event.dataTransfer.files.length; i++) {
uploadImage(event.dataTransfer.files[i]);
}
}
});
// Helper to replace editor content
function replaceContent(search, replace) {
let text = cm.getValue();
let cursor = cm.listSelections();
cm.setValue(text.replace(search, replace));
cm.setSelections(cursor);
}
// Helper to replace the start of the line
function replaceLineStart(newStart) {
let cursor = cm.getCursor();
let lineContent = cm.getLine(cursor.line);
let lineLen = lineContent.length;
let lineStart = lineContent.split(' ')[0];
// Remove symbol if already set
if (lineStart === newStart) {
lineContent = lineContent.replace(`${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(/\.(.+)$/);
if (fileNameMatches.length > 1) ext = fileNameMatches[1];
}
// Insert image into markdown
const id = "image-" + Math.random().toString(16).slice(2);
const placeholderImage = window.baseUrl(`/loading.gif#upload${id}`);
const selectedText = cm.getSelection();
const placeHolderText = `![${selectedText}](${placeholderImage})`;
const cursor = cm.getCursor();
cm.replaceSelection(placeHolderText);
cm.setCursor({line: cursor.line, ch: cursor.ch + selectedText.length + 3});
const remoteFilename = "image-" + Date.now() + "." + ext;
const formData = new FormData();
formData.append('file', file, remoteFilename);
formData.append('uploaded_to', context.pageId);
window.$http.post('/images/gallery', formData).then(resp => {
const newContent = `[![${selectedText}](${resp.data.thumbs.display})](${resp.data.url})`;
replaceContent(placeHolderText, newContent);
}).catch(err => {
window.$events.emit('error', trans('errors.image_upload_error'));
replaceContent(placeHolderText, selectedText);
console.log(err);
});
}
function insertLink() {
let cursorPos = cm.getCursor('from');
let selectedText = cm.getSelection() || '';
let newText = `[${selectedText}]()`;
cm.focus();
cm.replaceSelection(newText);
let cursorPosDiff = (selectedText === '') ? -3 : -1;
cm.setCursor(cursorPos.line, cursorPos.ch + newText.length+cursorPosDiff);
}
this.updateAndRender();
}
actionInsertImage() {
const cursorPos = this.cm.getCursor('from');
window.ImageManager.show(image => {
let selectedText = this.cm.getSelection();
let newText = "[![" + (selectedText || image.name) + "](" + image.thumbs.display + ")](" + image.url + ")";
this.cm.focus();
this.cm.replaceSelection(newText);
this.cm.setCursor(cursorPos.line, cursorPos.ch + newText.length);
}, 'gallery');
}
actionShowImageManager() {
const cursorPos = this.cm.getCursor('from');
window.ImageManager.show(image => {
this.insertDrawing(image, cursorPos);
}, 'drawio');
}
// Show the popup link selector and insert a link when finished
actionShowLinkSelector() {
const 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.$http.post(window.baseUrl('/images/drawio'), data).then(resp => {
this.insertDrawing(resp.data, cursorPos);
DrawIO.close();
}).catch(err => {
window.$events.emit('error', trans('errors.image_upload_error'));
console.log(err);
});
});
}
insertDrawing(image, originalCursor) {
const newText = `<div drawio-diagram="${image.id}"><img src="${image.url}"></div>`;
this.cm.focus();
this.cm.replaceSelection(newText);
this.cm.setCursor(originalCursor.line, originalCursor.ch + newText.length);
}
// Show draw.io if enabled and handle save.
actionEditDrawing(imgContainer) {
const drawingDisabled = document.querySelector('[drawio-enabled]').getAttribute('drawio-enabled') !== 'true';
if (drawingDisabled) {
return;
}
const cursorPos = this.cm.getCursor('from');
const drawingId = imgContainer.getAttribute('drawio-diagram');
DrawIO.show(() => {
return DrawIO.load(drawingId);
}, (pngData) => {
let data = {
image: pngData,
uploaded_to: Number(document.getElementById('page-editor').getAttribute('page-id'))
};
window.$http.post(window.baseUrl(`/images/drawio`), data).then(resp => {
let newText = `<div drawio-diagram="${resp.data.id}"><img src="${resp.data.url}"></div>`;
let newContent = this.cm.getValue().split('\n').map(line => {
if (line.indexOf(`drawio-diagram="${drawingId}"`) !== -1) {
return newText;
}
return line;
}).join('\n');
this.cm.setValue(newContent);
this.cm.setCursor(cursorPos);
this.cm.focus();
DrawIO.close();
}).catch(err => {
window.$events.emit('error', trans('errors.image_upload_error'));
console.log(err);
});
});
}
// Scroll to a specified text
scrollToText(searchText) {
if (!searchText) {
return;
}
const content = this.cm.getValue();
const lines = content.split(/\r?\n/);
let lineNumber = lines.findIndex(line => {
return line && line.indexOf(searchText) !== -1;
});
if (lineNumber === -1) {
return;
}
this.cm.scrollIntoView({
line: lineNumber,
}, 200);
this.cm.focus();
// set the cursor location.
this.cm.setCursor({
line: lineNumber,
char: lines[lineNumber].length
})
}
listenForBookStackEditorEvents() {
function getContentToInsert({html, markdown}) {
return markdown || html;
}
// Replace editor content
window.$events.listen('editor::replace', (eventContent) => {
const markdown = getContentToInsert(eventContent);
this.cm.setValue(markdown);
});
// Append editor content
window.$events.listen('editor::append', (eventContent) => {
const cursorPos = this.cm.getCursor('from');
const markdown = getContentToInsert(eventContent);
const content = this.cm.getValue() + '\n' + markdown;
this.cm.setValue(content);
this.cm.setCursor(cursorPos.line, cursorPos.ch);
});
// Prepend editor content
window.$events.listen('editor::prepend', (eventContent) => {
const cursorPos = this.cm.getCursor('from');
const markdown = getContentToInsert(eventContent);
const content = markdown + '\n' + this.cm.getValue();
this.cm.setValue(content);
const prependLineCount = markdown.split('\n').length;
this.cm.setCursor(cursorPos.line + prependLineCount, cursorPos.ch);
});
}
}
export default MarkdownEditor ;