Support using tag-like strings in an ICS file

[takaram]

What do you want to achieve?

Currently Ics::generate() calls strip_tags on the description text.

calendar-links/src/Generators/Ics.php

Lines 65 to 67 in 1178fda

	if ($link->description) {
	$url[] = 'DESCRIPTION:'.$this->escapeString(strip_tags($link->description));
	}

I understand it is because Google calendar (and maybe others) supports HTML tags in the description text of an event while iCalendar does not.
However, strip_tags removes all strings enclosed by <>. This means you cannot use any angle brackets in the description.

$ cat test.php
<?php

use Spatie\CalendarLinks\Generators\Ics;
use Spatie\CalendarLinks\Link;

require __DIR__ . '/vendor/autoload.php';

$link = Link::create('title', new DateTime, new DateTime)->description('This is a <test description>.');
$ics = new Ics([], ['format' => 'file']);

echo $ics->generate($link), "\n";
$ php test.php
BEGIN:VCALENDAR
VERSION:2.0
PRODID:Spatie calendar-links
BEGIN:VEVENT
UID:e91d06b8ce3f5bbe3c7ea6ea83fdcbf0
SUMMARY:title
DTSTAMP:20241118T070823Z
DTSTART:20241118T070823Z
DTEND:20241118T070823Z
DESCRIPTION:This is a .
END:VEVENT
END:VCALENDAR

Suggestion

I would appreciate if Ics class has an option to skip strip_tags, e.g. new Ics(['stripTags' => false]).