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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();
formData.append('file', file, file.name);
const res = await POST(uploadUrl, {data: formData});
return await res.json();
}
function triggerEditorContentChanged(target) {
target.dispatchEvent(new CustomEvent('ce-editor-content-changed', {bubbles: true}));
}
class TextareaEditor {
constructor(editor) {
this.editor = editor;
}
insertPlaceholder(value) {
const editor = this.editor;
const startPos = editor.selectionStart;
const endPos = editor.selectionEnd;
editor.value = editor.value.substring(0, startPos) + value + editor.value.substring(endPos);
editor.selectionStart = startPos;
editor.selectionEnd = startPos + value.length;
editor.focus();
triggerEditorContentChanged(editor);
}
replacePlaceholder(oldVal, newVal) {
const editor = this.editor;
const startPos = editor.selectionStart;
const endPos = editor.selectionEnd;
if (editor.value.substring(startPos, endPos) === oldVal) {
editor.value = editor.value.substring(0, startPos) + newVal + editor.value.substring(endPos);
editor.selectionEnd = startPos + newVal.length;
} else {
editor.value = editor.value.replace(oldVal, newVal);
editor.selectionEnd -= oldVal.length;
editor.selectionEnd += newVal.length;
}
editor.selectionStart = editor.selectionEnd;
editor.focus();
triggerEditorContentChanged(editor);
}
}
class CodeMirrorEditor {
constructor(editor) {
this.editor = editor;
}
insertPlaceholder(value) {
const editor = this.editor;
const startPoint = editor.getCursor('start');
const endPoint = editor.getCursor('end');
editor.replaceSelection(value);
endPoint.ch = startPoint.ch + value.length;
editor.setSelection(startPoint, endPoint);
editor.focus();
triggerEditorContentChanged(editor.getTextArea());
}
replacePlaceholder(oldVal, newVal) {
const editor = this.editor;
const endPoint = editor.getCursor('end');
if (editor.getSelection() === oldVal) {
editor.replaceSelection(newVal);
} else {
editor.setValue(editor.getValue().replace(oldVal, newVal));
}
endPoint.ch -= oldVal.length;
endPoint.ch += newVal.length;
editor.setSelection(endPoint, endPoint);
editor.focus();
triggerEditorContentChanged(editor.getTextArea());
}
}
async function handleClipboardImages(editor, dropzone, images, e) {
const uploadUrl = dropzone.getAttribute('data-upload-url');
const filesContainer = dropzone.querySelector('.files');
if (!dropzone || !uploadUrl || !filesContainer || !images.length) return;
e.preventDefault();
e.stopPropagation();
for (const img of images) {
const name = img.name.slice(0, img.name.lastIndexOf('.'));
const placeholder = ``;
editor.insertPlaceholder(placeholder);
const {uuid} = await uploadFile(img, uploadUrl);
const {width, dppx} = await imageInfo(img);
let text;
if (width > 0 && dppx > 1) {
// Scale down images from HiDPI monitors. This uses the <img> tag because it's the only
// method to change image size in Markdown that is supported by all implementations.
// Make the image link relative to the repo path, then the final URL is "/sub-path/owner/repo/attachments/{uuid}"
const url = `attachments/${uuid}`;
text = `<img width="${Math.round(width / dppx)}" alt="${htmlEscape(name)}" src="${htmlEscape(url)}">`;
} else {
// Markdown always renders the image with a relative path, so the final URL is "/sub-path/owner/repo/attachments/{uuid}"
// TODO: it should also use relative path for consistency, because absolute is ambiguous for "/sub-path/attachments" or "/attachments"
const url = `/attachments/${uuid}`;
text = ``;
}
editor.replacePlaceholder(placeholder, text);
const input = document.createElement('input');
input.setAttribute('name', 'files');
input.setAttribute('type', 'hidden');
input.setAttribute('id', uuid);
input.value = uuid;
filesContainer.append(input);
}
}
function handleClipboardText(textarea, text, e) {
// when pasting links over selected text, turn it into [text](link), except when shift key is held
const {value, selectionStart, selectionEnd, _shiftDown} = textarea;
if (_shiftDown) return;
const selectedText = value.substring(selectionStart, selectionEnd);
const trimmedText = text.trim();
if (selectedText && isUrl(trimmedText)) {
e.stopPropagation();
e.preventDefault();
replaceTextareaSelection(textarea, `[${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 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);
}
});
}
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