7762 - baremetal/shell: backspace

The text buffer can now shrink, which means we need to be careful to erase
the old location of the cursor. Just clear screen before render each time.
Which means we need to be more efficient with our rendering.

1 files changed, 7 insertions, 5 deletions

diff --git a/baremetal/shell/main.mu b/baremetal/shell/main.mu
index ee2dda60..262b9829 100644
--- a/baremetal/shell/main.mu
+++ b/baremetal/shell/main.mu
@@ -7,11 +7,13 @@ fn main {
   initialize-sandbox sandbox
   {
     render-sandbox 0/screen, sandbox, 2/x, 2/y
-    var key/eax: byte <- read-key 0/keyboard
-    compare key, 0
-    loop-if-=
-    # no way to quit right now; just reboot
-    edit-sandbox sandbox, key
+    {
+      var key/eax: byte <- read-key 0/keyboard
+      compare key, 0
+      loop-if-=
+      # no way to quit right now; just reboot
+      edit-sandbox sandbox, key
+    }
     loop
   }
 }