From fd513d6b9f7725c4100364a06ce14536e9c7b0ce Mon Sep 17 00:00:00 2001
From: James Cramer <jcramer@simpleledger.io>
Date: Fri, 28 Jun 2019 09:52:28 -0400
Subject: [PATCH] add alt stack

---
 debug.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/debug.go b/debug.go
index e3afc7a..fe52e41 100644
--- a/debug.go
+++ b/debug.go
@@ -291,6 +291,24 @@ scriptLoop:
 
 	tm.Println(box.String())
 
+	altstack := vm.GetAltStack()
+	if len(altstack) > 0 && !done && !fail {
+		tm.Println(tm.Background(tm.Color(tm.Bold("Alt Stack"), tm.WHITE), tm.MAGENTA))
+		var box *tm.Box
+		if done && !fail {
+			err = vm.CheckErrorCondition(true)
+			if err != nil {
+				done = false
+				fail = true
+			}
+		}
+		box = tm.NewBox(100|tm.PCT, len(vm.GetAltStack())+2, 0)
+		for i := len(altstack) - 1; i >= 0; i-- {
+			fmt.Fprintf(box, "%s\n", hex.EncodeToString(altstack[i]))
+		}
+		tm.Println(box.String())
+	}
+
 	tm.Printf("%s%s%s%s%s%s\n", "F3", tm.Background(tm.Color(tm.Bold("Step Back"), tm.WHITE), tm.CYAN), "F4", tm.Background(tm.Color(tm.Bold("Step Forward"), tm.WHITE), tm.CYAN), "ESC", tm.Background(tm.Color(tm.Bold("Quit"), tm.WHITE), tm.CYAN))
 	tm.Flush()