Misc. bookmarklets from https://news.ycombinator.com/item?id=42904679

stay-here.js

// bookmarklet-title: Stay Here
// bookmarklet-about: Prevent leaving current page. See https://river.me/blog/bookmarklet-stay-here/.

window.addEventListener('beforeunload', function (e) {
	e.preventDefault();
});

twitter-search.js

// bookmarklet-title: Twitter Search
// bookmarklet-about: Tweak Twitter's advances search syntax. See https://river.me/blog/firefox-keep-bookmark-keywords/.

(function () {
	let s = "%s";
	let url = "https://twitter.com/search?q=%s";
	let l = {
		all:'%s',
		exact:'"%s"',
		from:"(from:%s)",
		any:"(%s)",
		not:"-%s",
		to:"(to:%s)",
		mentions:"@%s",
		hashtag:"(#%s)",
		before:"until:%s",
		after:"since:%s",
	};
	let chunks = url.split("%s");
	let args = s.split("--");
	let nurl = chunks[0];
	let p = [];
	for (j=1; j<args.length; j++) {
		arg=args[j];
		arg=arg.replace(/\^/g, " ");
		w=arg.match(/\w+/);
		arg=arg.replace(/\w+:/, "");
		p.push(l[w].replace('%s', arg.trim()));
	}
	nurl += p.join(' ');
	if (chunks[1]) nurl+= chunks[1];
	location.replace(nurl, "< BR>");
})();

url-cli.js

// bookmarklet-title: URL CLI
// bookmarklet-about: Keyword substitution. See https://river.me/blog/url-bar-is-a-cli/.

var s = "%s";
url = "https://%s.gamepedia.com/index.php?search=%s&title=Special:Search";
tt = [""];
j = 0;
qc = 0;
chunks = url.split("%s");
for (i = 0; i < s.length; i++) {
	if (s.charAt(i) == "%22") qc = qc ^ 1;
	if (s.charAt(i) == " " && (qc || j >= chunks.length - 2)) {
		tt[j] += "^";
	} else if (s.charAt(i) == " ") {
		j++;
		tt.push(" ");
	} else {
		tt[j] += s.charAt(i);
	}
}
t = tt.join("");
args = t.split(/\s/);
nurl = "";
for (i = 0; i < chunks.length; i++) {
	nurl += chunks[i];
	if (args[i] != undefined) {
		args[i] = args[i].replace(/\^/g, " ");
		nurl += args[i];
	}
}
location.replace(nurl, "< BR>");