From 2da8430d52fa551e26def36aaf64d25e6eed7068 Mon Sep 17 00:00:00 2001
From: Jay Moore <dewdude@gmail.com>
Date: Wed, 21 Sep 2022 12:39:42 -0400
Subject: [PATCH] Forgot the HOWITWORKS

---
 HOWITWORKS.MD | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/HOWITWORKS.MD b/HOWITWORKS.MD
index a6a6da4..222ae29 100644
--- a/HOWITWORKS.MD
+++ b/HOWITWORKS.MD
@@ -32,7 +32,7 @@ exten = s,1,Answer()							# Answer the channel.
 same = n,Set(VOLUME(TX)=-3)						# Lower volume since that seems necessary.
 same = n,Set(c=examplejuke-main)					# Set the "c" variable so we can return to this context.
 same = n(loop),Background(foobar/menu)					# Label for "loop", plays the menu audio.
-same = n,WaitExten(5)							# Wait a few seconds
+same = n,WaitExten(5)							# Wait a few seconds (AJW won't write this if delay is skipped)
 same = n,Set(m=$[${m} + 1])						# Increase "m" by one.
 same = n,GoToIf($["${m}" < "5"]?loop)					# Compare to "5", return to "loop" if true.
 same = n,(goodbye)Background(foobar/bye)				# It was false...good bye. "Goodbye" label.
@@ -40,16 +40,25 @@ same = n,Hangup()							# SLAM
 
 exten = _00XX,1,Set(aa=foobar/00album)					# Set the aa variable to the album directory for leading 00
 same = n,GoToIf($["${EXTEN:-2}" = "00"]?8track-player,*11,1)		# Check last two dialed. If album playback, pass total tracks as extension.
+same = n,GoToIf($["${EXTEN:-2}" > "19"]?9999)			# Make sure we don't exceed the actual number of tracks
 same = n,GoTo(cart-player,*${EXTEN:-2},1)				# Pass the last two digits to cart-player as *ext
+same = 9999,Playback(option-is-invalid)					# WRONG!
+same = n,GoTo(examplejuke-main,s,1)						# Go back and try again
 
 exten = _01XX,1,Set(aa=foobar/01album)					# Repeat for album leading 01
 same = n,GoToIf($["${EXTEN:-2}" = "00"]?8track-player,*15,1)
+same = n,GoToIf($["${EXTEN:-2}" > "19"]?9999)
 same = n,GoTo(cart-player,*${EXTEN:-2},1)
+same = 9999,Playback(option-is-invalid)					
+same = n,GoTo(examplejuke-main,s,1)	
 
 exten = _02XX,1,Set(aa=foobar/02album)					# Album 02 is different. Files do not have a leading 0.
 same = n,GoToIf($["${EXTEN:-2}" = "00"]?8track-player,#12,1)		# Pass last two to 8track-player's # pattern.
+same = n,GoToIf($["${EXTEN:-2}" > "19"]?9999)			# Make sure we don't exceed the actual number of tracks
 same = n,GoToIf($["${EXTEN:-2}" < "10"]?cart-player,#${EXTEN:-1},1) 	# If the last two are less than 10; pass to single digit to cart-player #ext
 same = n,GoTo(cart-player,*${EXTEN:-2},1)				# Use the "standard" call for tracks more than 10.
+same = 9999,Playback(option-is-invalid)					# WRONG!
+same = n,GoTo(examplejuke-main,s,1)						# Go back and try again
 ```
 
 The setup for the jukeboxes has undergone about as much optimization as I think I can perform. I did trade a few variables for reducing the overall number of lines.