ttrss/plugins/bookmarklets/init.php

<?php
class Bookmarklets extends Plugin {
	private $host;

	function about() {
		return array(1.0,
			"Easy feed subscription and web page sharing using bookmarklets",
			"fox",
			false,
			"https://git.tt-rss.org/fox/tt-rss/wiki/ShareAnything");
  }

	function init($host) {
		$this->host = $host;

		$host->add_hook($host::HOOK_PREFS_TAB, $this);
	}

	private function subscribe_to_feed_url() {
		$url_path = get_self_url_prefix() .
			"/public.php?op=subscribe&feed_url=%s";
		return $url_path;
	}

	function hook_prefs_tab($args) {
		if ($args != "prefFeeds")
			return;

			$bm_subscribe_url = str_replace('%s', '', $this->subscribe_to_feed_url());
			$confirm_str = str_replace("'", "\'", __('Subscribe to %s in Tiny Tiny RSS?'));
			$bm_subscribe_url = htmlspecialchars("javascript:{if(confirm('$confirm_str'.replace('%s',window.location.href)))window.location.href='$bm_subscribe_url'+encodeURIComponent(window.location.href)}");

			$bm_share_url = htmlspecialchars("javascript:(function(){var d=document,w=window,e=w.getSelection,k=d.getSelection,x=d.selection,s=(e?e():(k)?k():(x?x.createRange().text:0)),f='".get_self_url_prefix()."/public.php?op=sharepopup',l=d.location,e=encodeURIComponent,g=f+'&title='+((e(s))?e(s):e(document.title))+'&url='+e(l.href);function a(){if(!w.open(g,'t','toolbar=0,resizable=0,scrollbars=1,status=1,width=500,height=250')){l.href=g;}}a();})()");
		?>

		<div dojoType="dijit.layout.AccordionPane"
			title="<i class='material-icons'>bookmark</i> <?= __('Bookmarklets') ?>">

			<h3><?= __("Drag the link below to your browser toolbar, open the feed you're interested in in your browser and click on the link to subscribe to it.") ?></h3>

			<label class='dijitButton'>
				<a href="<?= $bm_subscribe_url ?>"><?= __('Subscribe in Tiny Tiny RSS') ?></a>
			</label>

			<h3><?= __("Use this bookmarklet to publish arbitrary pages using Tiny Tiny RSS") ?></h3>

			<label class='dijitButton'>
				<a href="<?= $bm_share_url ?>"><?= __('Share with Tiny Tiny RSS') ?></a>
			</label>

			<?= \Controls\button_tag(\Controls\icon("help") . " " . __("More info..."), "",
									["class" => 'alt-info', "onclick" => "window.open('https://tt-rss.org/wiki/ShareAnything')"]) ?>

		</div>

		<?php
	}

	function api_version() {
		return 2;
	}

}