Retracement Level Trigger

I use the simple script to notify me when a retracement level has been met. I use the SMS alert to tell me when a specific retracement level has been met from a local pivot a high or local pivot low. Please let me know what you think. Feel free to make improvements and repost.
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 a publication is governed by House Rules. You can favorite it to use it on a chart.


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Want to use this script on a chart?
// script written by Paul Johnson: minorplanet2
//  use this script to set triggers on Fibonacci retracement levels.
len=input(15,title="Lookback Length") //how far back to look for max pivots and min pivots
retr=input(0.382,title="Retracement Ratio",type=float)
base=input(50,title="Pivot Value", type=float) //  set the value of the fixed pivot from which to draw the retracement
// calculates the retracement value for the range between the pivot input and the local min or max
// if the retracement from the local pivot high is met, a value of -1 is returned
// if the retracement from the local pivot low is met, a value of +1 is returned
plot(tri,title="retracement met:-1/1")