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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)
155 lines
5.0 KiB
JavaScript
155 lines
5.0 KiB
JavaScript
import {htmlEscape} from 'escape-goat';
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import {POST} from '../../modules/fetch.js';
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import {imageInfo} from '../../utils/image.js';
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import {getPastedContent, replaceTextareaSelection} from '../../utils/dom.js';
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import {isUrl} from '../../utils/url.js';
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async function uploadFile(file, uploadUrl) {
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const formData = new FormData();
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formData.append('file', file, file.name);
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const res = await POST(uploadUrl, {data: formData});
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return await res.json();
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}
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function triggerEditorContentChanged(target) {
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target.dispatchEvent(new CustomEvent('ce-editor-content-changed', {bubbles: true}));
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}
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class TextareaEditor {
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constructor(editor) {
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this.editor = editor;
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}
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insertPlaceholder(value) {
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const editor = this.editor;
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const startPos = editor.selectionStart;
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const endPos = editor.selectionEnd;
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editor.value = editor.value.substring(0, startPos) + value + editor.value.substring(endPos);
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editor.selectionStart = startPos;
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editor.selectionEnd = startPos + value.length;
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editor.focus();
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triggerEditorContentChanged(editor);
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}
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replacePlaceholder(oldVal, newVal) {
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const editor = this.editor;
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const startPos = editor.selectionStart;
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const endPos = editor.selectionEnd;
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if (editor.value.substring(startPos, endPos) === oldVal) {
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editor.value = editor.value.substring(0, startPos) + newVal + editor.value.substring(endPos);
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editor.selectionEnd = startPos + newVal.length;
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} else {
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editor.value = editor.value.replace(oldVal, newVal);
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editor.selectionEnd -= oldVal.length;
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editor.selectionEnd += newVal.length;
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}
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editor.selectionStart = editor.selectionEnd;
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editor.focus();
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triggerEditorContentChanged(editor);
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}
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}
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class CodeMirrorEditor {
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constructor(editor) {
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this.editor = editor;
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}
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insertPlaceholder(value) {
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const editor = this.editor;
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const startPoint = editor.getCursor('start');
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const endPoint = editor.getCursor('end');
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editor.replaceSelection(value);
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endPoint.ch = startPoint.ch + value.length;
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editor.setSelection(startPoint, endPoint);
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editor.focus();
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triggerEditorContentChanged(editor.getTextArea());
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}
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replacePlaceholder(oldVal, newVal) {
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const editor = this.editor;
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const endPoint = editor.getCursor('end');
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if (editor.getSelection() === oldVal) {
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editor.replaceSelection(newVal);
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} else {
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editor.setValue(editor.getValue().replace(oldVal, newVal));
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}
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endPoint.ch -= oldVal.length;
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endPoint.ch += newVal.length;
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editor.setSelection(endPoint, endPoint);
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editor.focus();
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triggerEditorContentChanged(editor.getTextArea());
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}
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}
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async function handleClipboardImages(editor, dropzone, images, e) {
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const uploadUrl = dropzone.getAttribute('data-upload-url');
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const filesContainer = dropzone.querySelector('.files');
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if (!dropzone || !uploadUrl || !filesContainer || !images.length) return;
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e.preventDefault();
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e.stopPropagation();
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for (const img of images) {
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const name = img.name.slice(0, img.name.lastIndexOf('.'));
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const placeholder = `![${name}](uploading ...)`;
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editor.insertPlaceholder(placeholder);
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const {uuid} = await uploadFile(img, uploadUrl);
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const {width, dppx} = await imageInfo(img);
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const url = `/attachments/${uuid}`;
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let text;
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if (width > 0 && dppx > 1) {
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// Scale down images from HiDPI monitors. This uses the <img> tag because it's the only
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// method to change image size in Markdown that is supported by all implementations.
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text = `<img width="${Math.round(width / dppx)}" alt="${htmlEscape(name)}" src="${htmlEscape(url)}">`;
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} else {
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text = `![${name}](${url})`;
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}
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editor.replacePlaceholder(placeholder, text);
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const input = document.createElement('input');
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input.setAttribute('name', 'files');
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input.setAttribute('type', 'hidden');
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input.setAttribute('id', uuid);
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input.value = uuid;
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filesContainer.append(input);
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}
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}
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function handleClipboardText(textarea, text, e) {
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// when pasting links over selected text, turn it into [text](link), except when shift key is held
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const {value, selectionStart, selectionEnd, _shiftDown} = textarea;
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if (_shiftDown) return;
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const selectedText = value.substring(selectionStart, selectionEnd);
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const trimmedText = text.trim();
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if (selectedText && isUrl(trimmedText)) {
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e.stopPropagation();
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e.preventDefault();
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replaceTextareaSelection(textarea, `[${selectedText}](${trimmedText})`);
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}
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}
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export function initEasyMDEPaste(easyMDE, dropzone) {
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easyMDE.codemirror.on('paste', (_, e) => {
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const {images} = getPastedContent(e);
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if (images.length) {
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handleClipboardImages(new CodeMirrorEditor(easyMDE.codemirror), dropzone, images, e);
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}
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});
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}
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export function initTextareaPaste(textarea, dropzone) {
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textarea.addEventListener('paste', (e) => {
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const {images, text} = getPastedContent(e);
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if (images.length) {
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handleClipboardImages(new TextareaEditor(textarea), dropzone, images, e);
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} else if (text) {
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handleClipboardText(textarea, text, e);
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}
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});
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}
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