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Improve markdown textarea for indentation and lists (#31406)

Almost works like GitHub

* use Tab/Shift-Tab to indent/unindent the selected lines
* use Enter to insert a new line with the same indentation and prefix
This commit is contained in:
wxiaoguang 2024-06-21 16:14:40 +08:00 committed by GitHub
parent 06782872c4
commit 621e1ff9c9
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GPG Key ID: B5690EEEBB952194
3 changed files with 121 additions and 18 deletions

View File

@ -10,6 +10,7 @@ import {easyMDEToolbarActions} from './EasyMDEToolbarActions.js';
import {initTextExpander} from './TextExpander.js';
import {showErrorToast} from '../../modules/toast.js';
import {POST} from '../../modules/fetch.js';
import {initTextareaMarkdown} from './EditorMarkdown.js';
let elementIdCounter = 0;
@ -84,17 +85,6 @@ class ComboMarkdownEditor {
if (el.nodeName === 'BUTTON' && !el.getAttribute('type')) el.setAttribute('type', 'button');
}
this.textarea.addEventListener('keydown', (e) => {
if (e.shiftKey) {
e.target._shiftDown = true;
}
});
this.textarea.addEventListener('keyup', (e) => {
if (!e.shiftKey) {
e.target._shiftDown = false;
}
});
const monospaceButton = this.container.querySelector('.markdown-switch-monospace');
const monospaceEnabled = localStorage?.getItem('markdown-editor-monospace') === 'true';
const monospaceText = monospaceButton.getAttribute(monospaceEnabled ? 'data-disable-text' : 'data-enable-text');
@ -118,6 +108,7 @@ class ComboMarkdownEditor {
await this.switchToEasyMDE();
});
initTextareaMarkdown(this.textarea);
if (this.dropzone) {
initTextareaPaste(this.textarea, this.dropzone);
}

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@ -0,0 +1,103 @@
import {triggerEditorContentChanged} from './Paste.js';
function handleIndentSelection(textarea, e) {
const selStart = textarea.selectionStart;
const selEnd = textarea.selectionEnd;
if (selEnd === selStart) return; // do not process when no selection
e.preventDefault();
const lines = textarea.value.split('\n');
const selectedLines = [];
let pos = 0;
for (let i = 0; i < lines.length; i++) {
if (pos > selEnd) break;
if (pos >= selStart) selectedLines.push(i);
pos += lines[i].length + 1;
}
for (const i of selectedLines) {
if (e.shiftKey) {
lines[i] = lines[i].replace(/^(\t| {1,2})/, '');
} else {
lines[i] = ` ${lines[i]}`;
}
}
// re-calculating the selection range
let newSelStart, newSelEnd;
pos = 0;
for (let i = 0; i < lines.length; i++) {
if (i === selectedLines[0]) {
newSelStart = pos;
}
if (i === selectedLines[selectedLines.length - 1]) {
newSelEnd = pos + lines[i].length;
break;
}
pos += lines[i].length + 1;
}
textarea.value = lines.join('\n');
textarea.setSelectionRange(newSelStart, newSelEnd);
triggerEditorContentChanged(textarea);
}
function handleNewline(textarea, e) {
const selStart = textarea.selectionStart;
const selEnd = textarea.selectionEnd;
if (selEnd !== selStart) return; // do not process when there is a selection
const value = textarea.value;
// find the current line
// * if selStart is 0, lastIndexOf(..., -1) is the same as lastIndexOf(..., 0)
// * if lastIndexOf reruns -1, lineStart is 0 and it is still correct.
const lineStart = value.lastIndexOf('\n', selStart - 1) + 1;
let lineEnd = value.indexOf('\n', selStart);
lineEnd = lineEnd < 0 ? value.length : lineEnd;
let line = value.slice(lineStart, lineEnd);
if (!line) return; // if the line is empty, do nothing, let the browser handle it
// parse the indention
const indention = /^\s*/.exec(line)[0];
line = line.slice(indention.length);
// parse the prefixes: "1. ", "- ", "* ", "[ ] ", "[x] "
// there must be a space after the prefix because none of "1.foo" / "-foo" is a list item
const prefixMatch = /^([0-9]+\.|[-*]|\[ \]|\[x\])\s/.exec(line);
let prefix = '';
if (prefixMatch) {
prefix = prefixMatch[0];
if (lineStart + prefix.length > selStart) prefix = ''; // do not add new line if cursor is at prefix
}
line = line.slice(prefix.length);
if (!indention && !prefix) return; // if no indention and no prefix, do nothing, let the browser handle it
e.preventDefault();
if (!line) {
// clear current line if we only have i.e. '1. ' and the user presses enter again to finish creating a list
textarea.value = value.slice(0, lineStart) + value.slice(lineEnd);
} else {
// start a new line with the same indention and prefix
let newPrefix = prefix;
if (newPrefix === '[x]') newPrefix = '[ ]';
if (/^\d+\./.test(newPrefix)) newPrefix = `1. `; // a simple approach, otherwise it needs to parse the lines after the current line
const newLine = `\n${indention}${newPrefix}`;
textarea.value = value.slice(0, selStart) + newLine + value.slice(selEnd);
textarea.setSelectionRange(selStart + newLine.length, selStart + newLine.length);
}
triggerEditorContentChanged(textarea);
}
export function initTextareaMarkdown(textarea) {
textarea.addEventListener('keydown', (e) => {
if (e.key === 'Tab' && !e.ctrlKey && !e.metaKey && !e.altKey) {
// use Tab/Shift-Tab to indent/unindent the selected lines
handleIndentSelection(textarea, e);
} else if (e.key === 'Enter' && !e.shiftKey && !e.ctrlKey && !e.metaKey && !e.altKey) {
// use Enter to insert a new line with the same indention and prefix
handleNewline(textarea, e);
}
});
}

View File

@ -12,7 +12,7 @@ async function uploadFile(file, uploadUrl) {
return await res.json();
}
function triggerEditorContentChanged(target) {
export function triggerEditorContentChanged(target) {
target.dispatchEvent(new CustomEvent('ce-editor-content-changed', {bubbles: true}));
}
@ -124,17 +124,19 @@ async function handleClipboardImages(editor, dropzone, images, e) {
}
}
function handleClipboardText(textarea, text, e) {
// when pasting links over selected text, turn it into [text](link), except when shift key is held
const {value, selectionStart, selectionEnd, _shiftDown} = textarea;
if (_shiftDown) return;
function handleClipboardText(textarea, e, {text, isShiftDown}) {
// pasting with "shift" means "paste as original content" in most applications
if (isShiftDown) return; // let the browser handle it
// when pasting links over selected text, turn it into [text](link)
const {value, selectionStart, selectionEnd} = textarea;
const selectedText = value.substring(selectionStart, selectionEnd);
const trimmedText = text.trim();
if (selectedText && isUrl(trimmedText)) {
e.stopPropagation();
e.preventDefault();
replaceTextareaSelection(textarea, `[${selectedText}](${trimmedText})`);
}
// else, let the browser handle it
}
export function initEasyMDEPaste(easyMDE, dropzone) {
@ -147,12 +149,19 @@ export function initEasyMDEPaste(easyMDE, dropzone) {
}
export function initTextareaPaste(textarea, dropzone) {
let isShiftDown = false;
textarea.addEventListener('keydown', (e) => {
if (e.shiftKey) isShiftDown = true;
});
textarea.addEventListener('keyup', (e) => {
if (!e.shiftKey) isShiftDown = false;
});
textarea.addEventListener('paste', (e) => {
const {images, text} = getPastedContent(e);
if (images.length) {
handleClipboardImages(new TextareaEditor(textarea), dropzone, images, e);
} else if (text) {
handleClipboardText(textarea, text, e);
handleClipboardText(textarea, e, {text, isShiftDown});
}
});
}