OPEN-SOURCE SCRIPT
Weekend
Updated
It is tracking Previous candle high and Previous candle low. It is an important script to trail PDH PDL system (and more importantly to create alerts) which is rampantly used by price action traders.
Release Notes
Previous Script has certain restrictions for intraday. That has been fixed here. 
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Telegram: t.me/unofficed
Open-source script
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in publication is governed by House rules. You can favorite it to use it on a chart.
Disclaimer
The information and publications are not meant to be, and do not constitute, financial, investment, trading, or other types of advice or recommendations supplied or endorsed by TradingView. Read more in the Terms of Use.