prepare_term: account for all status lines.

* basta.sh (basta.prepare_term): The old logic of printing \n
ESC [ A (newline, go up one line) is inadequate when we have
multiple previous status lines to draw. It only works if the
previous status lines can be counted on to be already
scroll-protected.  We need to print as many new lines as we
have status lines, and then move the cursor up that many
lines. Also, before doing this, we reset the scrolling region
to the full size. This same logic could simplify
basta.fullscreen_alt.

1 files changed, 6 insertions, 1 deletions

diff --git a/basta.sh b/basta.sh
index d0afc20..5707e0e 100644
--- a/basta.sh
+++ b/basta.sh
@@ -39,6 +39,7 @@ basta.query_termios_lines_cols()
 basta.prepare_term()
 {
   local realrows
+  local i
 
   if ! basta.query_terminal_lines realrows; then
     return 1
@@ -46,7 +47,11 @@ basta.prepare_term()
 
   if [ -z "$basta_prev_reserved_rows" ] ; then
     basta_prev_reserved_rows=${#LC_basta_status[@]}
-    printf $'\n\e[A'
+    printf $'\e7\e[1;%sr\e8' $realrows
+    for (( i = 0; i <= basta_prev_reserved_rows; i++ )); do
+      printf $'\n'
+    done
+    printf $'\e[%sA' $i
   fi
 
   LINES=$((realrows - $basta_prev_reserved_rows - 1))