Only move bottom if it was scrolled out of the window - scroll - scrollbackbuffer program for st

git clone git://git.suckless.org/scroll

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---

commit 4b23d03e3c8dcac58d48fc89c1bc84f5ce27b718

parent 97b90414891e957c95caffe078c69b18aa38e659

Author: Jochen Sprickerhof 

Date:   Fri, 17 Apr 2020 22:47:19 +0200

Only move bottom if it was scrolled out of the window

Diffstat:
  M scroll.c                            |      12 +++++++++---

1 file changed, 9 insertions(+), 3 deletions(-)
---

diff --git a/scroll.c b/scroll.c

@@ -314,16 +314,22 @@ scrollup(int n)
                 write(STDOUT_FILENO, scrollend->buf + 1, scrollend->size - 1);
         else
                 write(STDOUT_FILENO, scrollend->buf, scrollend->size);
-        bottom = TAILQ_NEXT(bottom, entries);
+        if ( x + n >= ws.ws_row)
+                bottom = TAILQ_NEXT(bottom, entries);
 
         /* print rows lines and move bottom forward to the new screen bottom */
         for (; rows > 1; rows--) {
                 scrollend = TAILQ_PREV(scrollend, tailhead, entries);
-                bottom = TAILQ_NEXT(bottom, entries);
+                if ( x + n >= ws.ws_row)
+                        bottom = TAILQ_NEXT(bottom, entries);
                 write(STDOUT_FILENO, scrollend->buf, scrollend->size);
         }
         /* move cursor from line n to the old bottom position */
-        dprintf(STDOUT_FILENO, "\033[%d;0H", x);
+        if (x + n < ws.ws_row) {
+                dprintf(STDOUT_FILENO, "\033[%d;%dH", x + n, y);
+                write(STDOUT_FILENO, "\033[?25h", 6);        /* show cursor */
+        } else
+                dprintf(STDOUT_FILENO, "\033[%d;0H", ws.ws_row);
 }
 
 void