365 lines
14 KiB
JavaScript
365 lines
14 KiB
JavaScript
(() => {
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const $ = document.querySelector.bind(document);
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const $$ = (...args) => Array.prototype.slice.call(document.querySelectorAll(...args));
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const isMac = /Macintosh/.test(window.navigator.userAgent);
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function keyEventToShortcut(event) {
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let elideShift = event.key.toUpperCase() === event.key && event.shiftKey;
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return (event.ctrlKey ? 'Ctrl+' : '') +
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(event.altKey ? 'Alt+' : '') +
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(event.metaKey ? 'Meta+' : '') +
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(!elideShift && event.shiftKey ? 'Shift+' : '') +
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(event.key === ',' ? 'Comma' : event.key === ' ' ? 'Space' : event.key);
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}
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function prettifyShortcut(shortcut) {
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let keys = shortcut.split('+');
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if (isMac) {
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let cmdIdx = keys.indexOf('Meta');
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if (cmdIdx !== -1 && keys.length - cmdIdx > 2) {
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let tmp = keys[cmdIdx + 1];
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keys[cmdIdx + 1] = 'Meta';
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keys[cmdIdx] = tmp;
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}
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}
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let lastKey = keys[keys.length - 1];
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if (!keys.includes('Shift') && lastKey.toUpperCase() === lastKey && lastKey.toLowerCase() !== lastKey) {
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keys.splice(keys.length - 1, 0, 'Shift');
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}
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for (let i = 0; i < keys.length; i++) {
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if (isMac) {
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switch (keys[i]) {
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case 'Ctrl': keys[i] = '⌃'; break;
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case 'Alt': keys[i] = '⌥'; break;
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case 'Shift': keys[i] = '⇧'; break;
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case 'Meta': keys[i] = '⌘'; break;
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}
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}
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if (i === keys.length - 1 && i > 0 && keys[i].length === 1) {
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keys[i] = keys[i].toUpperCase();
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}
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switch (keys[i]) {
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case 'ArrowLeft': keys[i] = '←'; break;
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case 'ArrowRight': keys[i] = '→'; break;
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case 'ArrowUp': keys[i] = '↑'; break;
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case 'ArrowDown': keys[i] = '↓'; break;
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case 'Comma': keys[i] = ','; break;
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case 'Enter': keys[i] = '↩'; break;
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case ' ': keys[i] = 'Space'; break;
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}
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keys[i] = `<kbd>${keys[i]}</kbd>`;
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}
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return keys.join(isMac ? '' : ' + ');
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}
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function isTextField(element) {
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let name = element.nodeName.toLowerCase();
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return name === 'textarea' ||
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name === 'select' ||
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(name === 'input' && !['submit', 'reset', 'checkbox', 'radio'].includes(element.type)) ||
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element.isContentEditable;
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}
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let notTextField = event => !(event.target instanceof Node && isTextField(event.target));
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let allShortcuts = [];
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let shortcutsGroup = null;
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class ShortcutHandler {
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constructor(element, override, filter = () => true) {
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this.element = element;
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this.map = {};
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this.active = this.map;
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this.override = override;
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this.filter = filter;
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this.timeout = null;
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this.handleKeyDown = this.handleKeyDown.bind(this);
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this.resetActive = this.resetActive.bind(this);
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this.addEventListeners();
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}
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addEventListeners() {
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this.element.addEventListener('keydown', this.handleKeyDown);
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}
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add(text, action, description = null, shownInHelp = true) {
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let shortcuts = text.trim().split(',').map(shortcut => shortcut.trim().split(' '));
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if (shortcutsGroup && shownInHelp) {
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shortcutsGroup.push({
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action,
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shortcut: text,
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description,
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})
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}
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for (let shortcut of shortcuts) {
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let node = this.map;
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for (let key of shortcut) {
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if (!node[key]) {
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node[key] = {};
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}
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node = node[key];
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if (node.action) {
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delete node.action;
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delete node.shortcut;
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delete node.description;
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}
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}
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node.action = action;
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node.shortcut = shortcut;
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node.description = description;
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}
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}
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groupStart(title = null) {
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if (title) this.fakeItem(title);
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shortcutsGroup = [];
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}
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groupEnd() {
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if (shortcutsGroup && shortcutsGroup.length) allShortcuts.push(shortcutsGroup);
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shortcutsGroup = null;
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}
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fakeItem(shortcut, description = null) {
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let list = shortcutsGroup || allShortcuts;
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list.push({
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shortcut: description ? shortcut : null,
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description: description || shortcut,
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});
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}
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handleKeyDown(event) {
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if (event.defaultPrevented) return;
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if (['Control', 'Alt', 'Shift', 'Meta'].includes(event.key)) return;
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if (!this.filter(event)) return;
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let shortcut = keyEventToShortcut(event);
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if (!this.active[shortcut]) {
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this.resetActive();
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return;
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}
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this.active = this.active[shortcut];
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if (this.active.action) {
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this.active.action(event);
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if (this.override) event.preventDefault();
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this.resetActive();
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return;
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}
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if (this.timeout) clearTimeout(this.timeout);
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this.timeout = window.setTimeout(this.resetActive, 1500);
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}
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resetActive() {
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this.active = this.map;
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if (this.timeout) {
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clearTimeout(this.timeout)
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this.timeout = null;
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}
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}
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}
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function bindElementFactory(handler) {
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return (shortcut, element, ...other) => {
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element = typeof element === 'string' ? $(element) : element;
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if (!element) return;
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handler.add(shortcut, () => {
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if (isTextField(element)) {
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element.focus();
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} else {
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element.click();
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}
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}, ...other);
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};
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}
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function bindLinkFactory(handler) {
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return (shortcut, link, ...other) => handler.add(shortcut, () => window.location.href = link, ...other);
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}
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function bindCollectionFactory(handler) {
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return (prefix, elements, collectionDescription, itemDescription) => {
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handler.fakeItem(prefix + ' 1 – 9', collectionDescription);
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if (typeof elements === 'string') {
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elements = $$(elements);
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} else if (Array.isArray(elements)) {
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elements = elements.map(el => typeof el === 'string' ? $(el) : el);
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}
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for (let i = 1; i <= elements.length && i < 10; i++) {
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bindElementFactory(handler)(`${prefix} ${i}`, elements[i-1], `${itemDescription} #${i}`, false);
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}
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}
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}
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class ShortcutsHelpDialog {
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constructor() {
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let template = $('#dialog-template');
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this.wrap = template.content.firstElementChild.cloneNode(true);
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this.wrap.classList.add('shortcuts-help');
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this.wrap.hidden = true;
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let handleClose = (event) => {
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event.preventDefault();
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event.stopPropagation();
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this.close();
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};
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this.shortcuts = new ShortcutHandler(this.wrap, false);
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this.shortcuts.add('Escape', handleClose, null, false);
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this.wrap.querySelector('.dialog__title').textContent = 'List of shortcuts';
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this.wrap.querySelector('.dialog__close-button').addEventListener('click', handleClose);
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this.wrap.addEventListener('click', handleClose);
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this.wrap.querySelector('.dialog').addEventListener('click', event => event.stopPropagation());
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let shortcutsGroup;
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let shortcutsGroupTemplate = document.createElement('div');
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shortcutsGroupTemplate.className = 'shortcuts-group';
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for (let item of allShortcuts) {
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if (item.description && !item.shortcut) {
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shortcutsGroup = shortcutsGroupTemplate.cloneNode();
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this.wrap.querySelector('.dialog__content').appendChild(shortcutsGroup);
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let heading = document.createElement('h2');
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heading.className = 'shortcuts-group-heading';
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heading.textContent = item.description;
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shortcutsGroup.appendChild(heading);
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} else {
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let list = document.createElement('ul');
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list.className = 'shortcuts-list';
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for (let shortcut of item) {
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let listItem = document.createElement('li');
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listItem.className = 'shortcut-row';
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list.appendChild(listItem);
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let descriptionColumn = document.createElement('div')
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descriptionColumn.className = 'shortcut-row__description';
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descriptionColumn.textContent = shortcut.description;
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listItem.appendChild(descriptionColumn);
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let shortcutColumn = document.createElement('div');
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shortcutColumn.className = 'shortcut-row__keys';
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shortcutColumn.innerHTML = shortcut.shortcut.split(',')
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.map(shortcuts => shortcuts.trim().split(' ').map(prettifyShortcut).join(' '))
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.join(' <span class="kbd-or">or</span> ');
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listItem.appendChild(shortcutColumn);
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}
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shortcutsGroup.appendChild(list);
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}
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}
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document.body.appendChild(this.wrap);
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}
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open() {
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this.prevActiveElement = document.activeElement;
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document.body.overflow = 'hidden';
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this.wrap.hidden = false;
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this.wrap.children[0].focus();
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}
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close() {
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document.body.overflow = '';
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this.wrap.hidden = true;
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if (this.prevActiveElement) {
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this.prevActiveElement.focus();
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this.prevActiveElement = null;
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}
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}
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}
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window.addEventListener('load', () => {
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let helpDialog = null;
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let openHelp = () => {
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if (!helpDialog) helpDialog = new ShortcutsHelpDialog();
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helpDialog.open();
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};
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// Global shortcuts work everywhere.
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let globalShortcuts = new ShortcutHandler(document, false);
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globalShortcuts.add('?, ' + (isMac ? 'Meta+/' : 'Ctrl+/'), openShortcutsReference);
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// Common shortcuts work everywhere except on text fields.
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let commonShortcuts = new ShortcutHandler(document, false, notTextField);
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let bindElement = bindElementFactory(commonShortcuts);
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let bindLink = bindLinkFactory(commonShortcuts);
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let bindCollection = bindCollectionFactory(commonShortcuts);
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// Common shortcuts
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commonShortcuts.groupStart('Common');
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bindCollection('g', '.header-links__link', 'First 9 header links', 'Header link');
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bindLink('g h', '/', 'Home');
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bindLink('g l', '/list/', 'List of hyphae');
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bindLink('g r', '/recent-changes/', 'Recent changes');
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bindElement('g u', '.header-links__entry_user .header-links__link', 'Your profile′s hypha');
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commonShortcuts.groupEnd();
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if (typeof editTextarea === 'undefined') {
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// Hypha shortcuts
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commonShortcuts.groupStart('Hypha');
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bindCollection('', 'article .wikilink', 'First 9 hypha′s links', 'Hypha link');
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bindElement('p, Alt+ArrowLeft, Ctrl+Alt+ArrowLeft', '.prevnext__prev', 'Next hypha');
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bindElement('n, Alt+ArrowRight, Ctrl+Alt+ArrowRight', '.prevnext__next', 'Previous hypha');
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bindElement('s, Alt+ArrowUp, Ctrl+Alt+ArrowUp', $$('.navi-title a').slice(1, -1).slice(-1)[0], 'Parent hypha');
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bindElement('c, Alt+ArrowDown, Ctrl+Alt+ArrowDown', '.subhyphae__link', 'First child hypha');
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bindElement('e, Ctrl+Enter', '.hypha-tabs__link[href^="/edit/"]', 'Edit this hypha');
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commonShortcuts.groupEnd();
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} else {
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// Hypha editor shortcuts. These work only on editor's text area.
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let editorShortcuts = new ShortcutHandler(editTextarea, true);
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let bindElement = bindElementFactory(editorShortcuts);
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let shortcuts = [
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// Win+Linux Mac Action Description
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['Ctrl+b', 'Meta+b', wrapBold, 'Format: Bold'],
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['Ctrl+i', 'Meta+i', wrapItalic, 'Format: Italic'],
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['Ctrl+M', 'Meta+Shift+m', wrapMonospace, 'Format: Monospaced'],
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['Ctrl+I', 'Meta+Shift+i', wrapHighlighted, 'Format: Highlight'],
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['Ctrl+.', 'Meta+Shift+.', wrapLifted, 'Format: Superscript'],
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['Ctrl+Comma', 'Meta+Shift+Comma', wrapLowered, 'Format: Subscript'],
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['Ctrl+X', 'Meta+Shift+x', wrapStrikethrough, 'Format: Strikethrough'],
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['Ctrl+k', 'Meta+k', wrapLink, 'Format: Link'],
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];
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editorShortcuts.groupStart('Editor');
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for (let shortcut of shortcuts) {
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if (isMac) {
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editorShortcuts.add(shortcut[1], ...shortcut.slice(2))
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} else {
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editorShortcuts.add(shortcut[0], ...shortcut.slice(2))
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}
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}
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editorShortcuts.groupEnd();
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editorShortcuts.groupStart();
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bindElement(isMac ? 'Meta+Enter' : 'Ctrl+Enter', $('.edit-form__save'), 'Save changes');
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editorShortcuts.groupEnd();
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}
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});
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})();
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