Support pasting URLs over markdown text (#29566)

Support pasting URLs over selection text in the textarea editor. Does
not work in EasyMDE and I don't intend to support it. Image paste works
as usual in both Textarea and EasyMDE.

The new `replaceTextareaSelection` function changes textarea content via
[`insertText`](https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand#using_inserttext)
command, which preserves history, e.g. `CTRL-Z` works and is also
demostrated below. We should later refactor the image paste code to use
the same function because it currently destroys history.

Overriding the formatting via `Shift` key is supported as well, e.g.
`Ctrl+Shift+V` will insert the URL as-is, like on GitHub.

![urlpaste](https://github.com/go-gitea/gitea/assets/115237/522b1023-6797-401c-9e4a-498570adfc88)

(cherry picked from commit a3cfe6f39ba33cea305de592a006727857014c53)
This commit is contained in:
silverwind 2024-03-08 16:15:58 +01:00 committed by Earl Warren
parent 18e0647c84
commit 4511287676
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GPG key ID: 0579CB2928A78A00
5 changed files with 103 additions and 31 deletions

View file

@ -3,7 +3,7 @@ import '@github/text-expander-element';
import $ from 'jquery';
import {attachTribute} from '../tribute.js';
import {hideElem, showElem, autosize, isElemVisible} from '../../utils/dom.js';
import {initEasyMDEImagePaste, initTextareaImagePaste} from './ImagePaste.js';
import {initEasyMDEPaste, initTextareaPaste} from './Paste.js';
import {handleGlobalEnterQuickSubmit} from './QuickSubmit.js';
import {renderPreviewPanelContent} from '../repo-editor.js';
import {easyMDEToolbarActions} from './EasyMDEToolbarActions.js';
@ -84,6 +84,17 @@ 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');
@ -108,7 +119,7 @@ class ComboMarkdownEditor {
});
if (this.dropzone) {
initTextareaImagePaste(this.textarea, this.dropzone);
initTextareaPaste(this.textarea, this.dropzone);
}
}
@ -241,7 +252,7 @@ class ComboMarkdownEditor {
});
this.applyEditorHeights(this.container.querySelector('.CodeMirror-scroll'), this.options.editorHeights);
await attachTribute(this.easyMDE.codemirror.getInputField(), {mentions: true, emoji: true});
initEasyMDEImagePaste(this.easyMDE, this.dropzone);
initEasyMDEPaste(this.easyMDE, this.dropzone);
hideElem(this.textareaMarkdownToolbar);
}

View file

@ -1,6 +1,8 @@
import {htmlEscape} from 'escape-goat';
import {POST} from '../../modules/fetch.js';
import {imageInfo} from '../../utils/image.js';
import {getPastedContent, replaceTextareaSelection} from '../../utils/dom.js';
import {isUrl} from '../../utils/url.js';
async function uploadFile(file, uploadUrl) {
const formData = new FormData();
@ -10,17 +12,6 @@ async function uploadFile(file, uploadUrl) {
return await res.json();
}
function clipboardPastedImages(e) {
if (!e.clipboardData) return [];
const files = [];
for (const item of e.clipboardData.items || []) {
if (!item.type || !item.type.startsWith('image/')) continue;
files.push(item.getAsFile());
}
return files;
}
function triggerEditorContentChanged(target) {
target.dispatchEvent(new CustomEvent('ce-editor-content-changed', {bubbles: true}));
}
@ -91,20 +82,16 @@ class CodeMirrorEditor {
}
}
const uploadClipboardImage = async (editor, dropzone, e) => {
async function handleClipboardImages(editor, dropzone, images, e) {
const uploadUrl = dropzone.getAttribute('data-upload-url');
const filesContainer = dropzone.querySelector('.files');
if (!uploadUrl || !filesContainer) return;
if (!dropzone || !uploadUrl || !filesContainer || !images.length) return;
const pastedImages = clipboardPastedImages(e);
if (!pastedImages || pastedImages.length === 0) {
return;
}
e.preventDefault();
e.stopPropagation();
for (const img of pastedImages) {
for (const img of images) {
const name = img.name.slice(0, img.name.lastIndexOf('.'));
const placeholder = `![${name}](uploading ...)`;
@ -131,18 +118,37 @@ const uploadClipboardImage = async (editor, dropzone, e) => {
input.value = uuid;
filesContainer.append(input);
}
};
}
export function initEasyMDEImagePaste(easyMDE, dropzone) {
if (!dropzone) return;
easyMDE.codemirror.on('paste', async (_, e) => {
return uploadClipboardImage(new CodeMirrorEditor(easyMDE.codemirror), dropzone, e);
function handleClipboardText(textarea, text, e) {
// when pasting links over selected text, turn it into [text](link), except when shift key is held
const {value, selectionStart, selectionEnd, _shiftDown} = textarea;
if (_shiftDown) return;
const selectedText = value.substring(selectionStart, selectionEnd);
const trimmedText = text.trim();
if (selectedText && isUrl(trimmedText)) {
e.stopPropagation();
e.preventDefault();
replaceTextareaSelection(textarea, `[${selectedText}](${trimmedText})`);
}
}
export function initEasyMDEPaste(easyMDE, dropzone) {
easyMDE.codemirror.on('paste', (_, e) => {
const {images} = getPastedContent(e);
if (images.length) {
handleClipboardImages(new CodeMirrorEditor(easyMDE.codemirror), dropzone, images, e);
}
});
}
export function initTextareaImagePaste(textarea, dropzone) {
if (!dropzone) return;
textarea.addEventListener('paste', async (e) => {
return uploadClipboardImage(new TextareaEditor(textarea), dropzone, e);
export function initTextareaPaste(textarea, dropzone) {
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);
}
});
}

View file

@ -242,3 +242,39 @@ export function isElemVisible(element) {
return Boolean(element.offsetWidth || element.offsetHeight || element.getClientRects().length);
}
// extract text and images from "paste" event
export function getPastedContent(e) {
const images = [];
for (const item of e.clipboardData?.items ?? []) {
if (item.type?.startsWith('image/')) {
images.push(item.getAsFile());
}
}
const text = e.clipboardData?.getData?.('text') ?? '';
return {text, images};
}
// replace selected text in a textarea while preserving editor history, e.g. CTRL-Z works after this
export function replaceTextareaSelection(textarea, text) {
const before = textarea.value.slice(0, textarea.selectionStart ?? undefined);
const after = textarea.value.slice(textarea.selectionEnd ?? undefined);
let success = true;
textarea.contentEditable = 'true';
try {
success = document.execCommand('insertText', false, text);
} catch {
success = false;
}
textarea.contentEditable = 'false';
if (success && !textarea.value.slice(0, textarea.selectionStart ?? undefined).endsWith(text)) {
success = false;
}
if (!success) {
textarea.value = `${before}${text}${after}`;
textarea.dispatchEvent(new CustomEvent('change', {bubbles: true, cancelable: true}));
}
}

View file

@ -1,3 +1,15 @@
export function pathEscapeSegments(s) {
return s.split('/').map(encodeURIComponent).join('/');
}
function stripSlash(url) {
return url.endsWith('/') ? url.slice(0, -1) : url;
}
export function isUrl(url) {
try {
return stripSlash((new URL(url).href)).trim() === stripSlash(url).trim();
} catch {
return false;
}
}

View file

@ -1,6 +1,13 @@
import {pathEscapeSegments} from './url.js';
import {pathEscapeSegments, isUrl} from './url.js';
test('pathEscapeSegments', () => {
expect(pathEscapeSegments('a/b/c')).toEqual('a/b/c');
expect(pathEscapeSegments('a/b/ c')).toEqual('a/b/%20c');
});
test('isUrl', () => {
expect(isUrl('https://example.com')).toEqual(true);
expect(isUrl('https://example.com/')).toEqual(true);
expect(isUrl('https://example.com/index.html')).toEqual(true);
expect(isUrl('/index.html')).toEqual(false);
});