From 27d2fcf721de6ac698cd61192cb1934864f414aa Mon Sep 17 00:00:00 2001
From: Will Corvo <nick.neytron@yandex.ru>
Date: Sun, 6 Sep 2026 02:38:35 +0300
Subject: [PATCH] cursor blinking rate feature

---
 src/tsm/libtsm-int.h |  1 +
 src/tsm/libtsm.h     |  3 +++
 src/tsm/libtsm.sym   |  6 ++++++
 src/tsm/tsm-screen.c | 24 ++++++++++++++++++++++++
 src/tsm/tsm-vte.c    |  5 +++++
 5 files changed, 39 insertions(+)

diff --git a/src/tsm/libtsm-int.h b/src/tsm/libtsm-int.h
index 19cee5b..9f87912 100644
--- a/src/tsm/libtsm-int.h
+++ b/src/tsm/libtsm-int.h
@@ -149,6 +149,7 @@ struct tsm_screen {
 	unsigned int cursor_y;			/* current cursor y-pos */
 
 	enum tsm_screen_cursor_style cstyle;	/* cursor shape */
+	uint32_t blinking_rate_ms;				/* cursor blinking rate */
 
 	/* tab ruler */
 	bool *tab_ruler;			/* tab-flag for all cells of one row */
diff --git a/src/tsm/libtsm.h b/src/tsm/libtsm.h
index 2659da1..d6fd35e 100644
--- a/src/tsm/libtsm.h
+++ b/src/tsm/libtsm.h
@@ -309,6 +309,9 @@ const struct tsm_screen_cell *tsm_screen_draw2(struct tsm_screen *con);
 enum tsm_screen_cursor_style tsm_screen_get_cursor_style(struct tsm_screen *con);
 void tsm_screen_set_cursor_style(struct tsm_screen *con, enum tsm_screen_cursor_style type);
 
+uint32_t tsm_screen_get_cursor_blinking_rate_ms(struct tsm_screen *con);
+void tsm_screen_set_cursor_blinking_rate_ms(struct tsm_screen *con, uint32_t ms);
+
 /** @} */
 
 /**
diff --git a/src/tsm/libtsm.sym b/src/tsm/libtsm.sym
index 7869144..b51302c 100644
--- a/src/tsm/libtsm.sym
+++ b/src/tsm/libtsm.sym
@@ -159,3 +159,9 @@ global:
 	tsm_screen_get_cursor_style;
 	tsm_screen_set_cursor_style;
 } LIBTSM_4_6;
+
+LIBTSM_4_8 {
+global:
+	tsm_screen_get_cursor_blinking_rate_ms;
+	tsm_screen_set_cursor_blinking_rate_ms;
+} LIBTSM_4_7;
diff --git a/src/tsm/tsm-screen.c b/src/tsm/tsm-screen.c
index bf37bad..407fcee 100644
--- a/src/tsm/tsm-screen.c
+++ b/src/tsm/tsm-screen.c
@@ -483,6 +483,7 @@ int tsm_screen_new(struct tsm_screen **out, tsm_log_t log, void *log_data)
 	con->def_attr.fr = 255;
 	con->def_attr.fg = 255;
 	con->def_attr.fb = 255;
+	con->blinking_rate_ms = 500;
 	shl_dlist_init(&con->sb.list);
 
 	ret = tsm_symbol_table_new(&con->sym_table);
@@ -1690,3 +1691,26 @@ void tsm_screen_set_cursor_style(struct tsm_screen *con, enum tsm_screen_cursor_
 
 	con->cstyle = type;
 }
+
+SHL_EXPORT
+uint32_t tsm_screen_get_cursor_blinking_rate_ms(struct tsm_screen *con)
+{
+	if (!con)
+		return 0;
+
+	return con->blinking_rate_ms;
+}
+
+SHL_EXPORT
+void tsm_screen_set_cursor_blinking_rate_ms(struct tsm_screen *con, uint32_t ms)
+{
+	if (!con)
+		return;
+
+	if (ms < 50)
+		ms = 50;
+	if (ms > 5000)
+		ms = 5000;
+
+	con->blinking_rate_ms = ms;
+}
diff --git a/src/tsm/tsm-vte.c b/src/tsm/tsm-vte.c
index f154782..204e224 100644
--- a/src/tsm/tsm-vte.c
+++ b/src/tsm/tsm-vte.c
@@ -2171,6 +2171,11 @@ static void do_csi(struct tsm_vte *vte, uint32_t data)
 				vte->led_cb(vte, vte->led_state, vte->led_data);
 		}
 		break;
+	case ']': /* Cursor blinking rate */
+		/* This behavior is similar to agetty */
+		if (vte->csi_argv[0] == 16 && vte->csi_argc >= 2)
+			tsm_screen_set_cursor_blinking_rate_ms(vte->con, vte->csi_argv[1]);
+		break;
 	default:
 		llog_debug(vte, "unhandled CSI sequence %c", data);
 	}