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import React from 'dom-chef';
import select from 'select-dom';
import delegate, {DelegateEvent} from 'delegate-it';
import insertText from 'insert-text-textarea';
import features from '../libs/features';
import * as icons from '../libs/icons';
// Wraps string in at least 2 \n on each side,
// as long as the field doesn't already have them.
// Code adopted/adapted from GitHub.
function smartBlockWrap(content: string, field: HTMLTextAreaElement): string {
const before = field.value.slice(0, field.selectionStart);
const after = field.value.slice(field.selectionEnd);
const [whitespaceAtStart] = /\n*$/.exec(before)!;
const [whitespaceAtEnd] = /^\n*/.exec(after)!;
let newlinesToAppend = '';
let newlinesToPrepend = '';
if (/\S/.test(before) && whitespaceAtStart.length < 2) {
newlinesToPrepend = '\n'.repeat(2 - whitespaceAtStart.length);
}
if (/\S/.test(after) && whitespaceAtEnd.length < 2) {
newlinesToAppend = '\n'.repeat(2 - whitespaceAtEnd.length);
}
return newlinesToPrepend + content + newlinesToAppend;
}
function init(): void {
delegate('.rgh-collapsible-content-btn', 'click', addContentToDetails);
for (const anchor of select.all('md-ref')) {
anchor.after(
<button type="button" className="toolbar-item tooltipped tooltipped-n rgh-collapsible-content-btn" aria-label="Add collapsible content">
{icons.foldDown()}
</button>
);
}
}
function addContentToDetails(event: DelegateEvent<MouseEvent, HTMLButtonElement>): void {
const field = event.delegateTarget.form!.querySelector('textarea')!;
const selection = field.value.slice(field.selectionStart, field.selectionEnd);
// Don't indent <summary> because indentation will not be automatic on multi-line content
const newContent = `
<details>
<summary>Details</summary>
${selection}
</details>
`.replace(/(\n|\b)\t+/g, '$1').trim();
// Inject new tags; it'll be undoable
insertText(field, smartBlockWrap(newContent, field));
// Restore selection.
// `selectionStart` will be right after the newly-inserted text
field.setSelectionRange(
field.value.lastIndexOf('</summary>', field.selectionStart) + '</summary>'.length + 2,
field.value.lastIndexOf('</details>', field.selectionStart) - 2
);
}
features.add({
id: __featureName__,
description: 'Adds a button to insert collapsible content (via `<details>`).',
screenshot: 'https://user-images.githubusercontent.com/1402241/53678019-0c721280-3cf4-11e9-9c24-4d11a697f67c.png',
include: [
features.hasRichTextEditor
],
load: features.onAjaxedPages,
init
});
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