Work harder at protecting the TTY rows.

- New variable basta_scroll_lines tracks the correct
  of LINES and tty rows.

- In basta.prepare_term, we set the value of this
  variable. Also, bugfix: we were referring to some
  nonexistent variables in the calculation.
  Luckily the bogus term existing_reserved-rows
  evaluated to 0.

- In basta.prompt_hook we set the tty rows to
  basta_scroll_lines.

1 files changed, 4 insertions, 2 deletions

diff --git a/basta.sh b/basta.sh
index 271caa0..8782177 100644
--- a/basta.sh
+++ b/basta.sh
@@ -4,6 +4,7 @@ basta_old_cmdno=${basta_old_cmdno-0}
 basta_old_lines=${basta_old_lines-0}
 basta_old_cols=${basta_old_cols-0}
 
+basta_scroll_lines=${basta_scroll_lines-$LINES}
 basta_prev_reserved_rows=${basta_prev_reserved_rows-}
 
 basta_status_alarm_pid=${basta_status_alarm_pid-}
@@ -24,7 +25,8 @@ basta.prepare_term()
     printf "\n\033[A"
   fi
 
-  stty rows $((LINES - existing_reserved-rows - 1))
+  basta_scroll_lines=$((LINES - 1))
+  stty rows $basta_scroll_lines
   basta_old_lines=$LINES
   basta_old_cols=$COLUMNS
 }
@@ -102,7 +104,7 @@ basta.prompt_hook()
    basta.check_cursor
    basta.do_exit_status $exit
    basta.update_status
-   stty sane
+   stty sane rows $basta_scroll_lines
 }
 
 basta.alarm_timer()