From e5724b7a1ec9c27bee097253134e5f4a7b47d5f9 Mon Sep 17 00:00:00 2001
From: Mike Pelletier <mike@mkp.ca>
Date: Wed, 28 Apr 2021 07:14:17 -0400
Subject: [PATCH] Explain `changed?`

---
 livesort_hssp/livesort.lissp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/livesort_hssp/livesort.lissp b/livesort_hssp/livesort.lissp
index 1ff147e..59036ce 100644
--- a/livesort_hssp/livesort.lissp
+++ b/livesort_hssp/livesort.lissp
@@ -42,6 +42,11 @@ will update the display."
                             ""))
                  (unless (eq line (getitem self.screen lineno))
                    (setitem self.screen lineno line)
+                   ;; `changed?` might have just been an explicit
+                   ;; boolean value, but Hissp would prefer that we
+                   ;; mutate values and not reassign variables.  Since
+                   ;; a `list` is an implicit boolean value, appending
+                   ;; (or not) to it works fine.
                    (.append changed? line)
                    ;; ^[[K to erase any characters that follow on this line
                    (.append output (.format "{}"