Add BreakIf function

debug/debug.go

@@ -148,6 +148,8 @@ func Log(tag string, f string, args ...interface{}) {
 	}
 }
 
+// Break stopts the program if the debug tag is active and the string in tag is
+// contained in the DEBUG_BREAK environment variable.
 func Break(tag string) {
 	// check if breaking is enabled
 	if v, ok := opts.breaks[tag]; !ok || !v {
@@ -166,3 +168,12 @@ func Break(tag string) {
 		panic(err)
 	}
 }
+
+// BreakIf stopts the program if the debug tag is active and the string in tag
+// is contained in the DEBUG_BREAK environment variable and the return value of
+// fn is true.
+func BreakIf(tag string, fn func() bool) {
+	if fn() {
+		Break(tag)
+	}
+}

debug/debug_release.go

@@ -5,3 +5,5 @@ package debug
 func Log(tag string, fmt string, args ...interface{}) {}
 
 func Break(string) {}
+
+func BreakIf(string, func() bool) {}