Add support for the SD (scroll down) escape sequence, GitHub issue 1861.

1 files changed, 40 insertions, 4 deletions

diff --git a/tty.c b/tty.c
index 024aef27..1658fb74 100644
--- a/tty.c
+++ b/tty.c
@@ -1558,10 +1558,11 @@ tty_cmd_reverseindex(struct tty *tty, const struct tty_ctx *ctx)
 		return;
 
 	if (ctx->bigger ||
-	    !tty_pane_full_width(tty, ctx) ||
+	    (!tty_pane_full_width(tty, ctx) && !tty_use_margin(tty)) ||
 	    tty_fake_bce(tty, wp, 8) ||
 	    !tty_term_has(tty->term, TTYC_CSR) ||
-	    !tty_term_has(tty->term, TTYC_RI) ||
+	    (!tty_term_has(tty->term, TTYC_RI) &&
+	    !tty_term_has(tty->term, TTYC_RIN)) ||
 	    ctx->wp->sx == 1 ||
 	    ctx->wp->sy == 1) {
 		tty_redraw_region(tty, ctx);
@@ -1571,10 +1572,13 @@ tty_cmd_reverseindex(struct tty *tty, const struct tty_ctx *ctx)
 	tty_default_attributes(tty, wp, ctx->bg);
 
 	tty_region_pane(tty, ctx, ctx->orupper, ctx->orlower);
-	tty_margin_off(tty);
+	tty_margin_pane(tty, ctx);
 	tty_cursor_pane(tty, ctx, ctx->ocx, ctx->orupper);
 
-	tty_putcode(tty, TTYC_RI);
+	if (tty_term_has(tty->term, TTYC_RI))
+		tty_putcode(tty, TTYC_RI);
+	else
+		tty_putcode1(tty, TTYC_RIN, 1);
 }
 
 void
@@ -1653,6 +1657,38 @@ tty_cmd_scrollup(struct tty *tty, const struct tty_ctx *ctx)
 }
 
 void
+tty_cmd_scrolldown(struct tty *tty, const struct tty_ctx *ctx)
+{
+	struct window_pane	*wp = ctx->wp;
+	u_int			 i;
+
+	if (ctx->bigger ||
+	    (!tty_pane_full_width(tty, ctx) && !tty_use_margin(tty)) ||
+	    tty_fake_bce(tty, wp, 8) ||
+	    !tty_term_has(tty->term, TTYC_CSR) ||
+	    (!tty_term_has(tty->term, TTYC_RI) &&
+	    !tty_term_has(tty->term, TTYC_RIN)) ||
+	    wp->sx == 1 ||
+	    wp->sy == 1) {
+		tty_redraw_region(tty, ctx);
+		return;
+	}
+
+	tty_default_attributes(tty, wp, ctx->bg);
+
+	tty_region_pane(tty, ctx, ctx->orupper, ctx->orlower);
+	tty_margin_pane(tty, ctx);
+	tty_cursor_pane(tty, ctx, ctx->ocx, ctx->orupper);
+
+	if (tty_term_has(tty->term, TTYC_RIN))
+		tty_putcode1(tty, TTYC_RIN, ctx->num);
+	else {
+		for (i = 0; i < ctx->num; i++)
+			tty_putcode(tty, TTYC_RI);
+	}
+}
+
+void
 tty_cmd_clearendofscreen(struct tty *tty, const struct tty_ctx *ctx)
 {
 	struct window_pane	*wp = ctx->wp;