[PATCH] ui/ncurses: Periodically refresh display

[Samuel Mendoza-Jonas]

When connecting to IPMI or serial consoles quite often the user must hit
a key or exit and restart petitboot-nc to cause it to appear. This
occurs when the user connects after petitboot-nc has drawn the current
screen. This can be a little confusing to users, especially in text
screens where keys such as 'Enter' won't have an affect.
To add some user friendliness create a timer callback that every five
seconds re-draws the current screen automatically.

Signed-off-by: Samuel Mendoza-Jonas <sam at mendozajonas.com>
---
 ui/ncurses/nc-cui.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/ui/ncurses/nc-cui.c b/ui/ncurses/nc-cui.c
index fbc02b9..6332585 100644
--- a/ui/ncurses/nc-cui.c
+++ b/ui/ncurses/nc-cui.c
@@ -499,6 +499,25 @@ static int cui_process_js(void *arg)
 	return 0;
 }
 
+/*
+ * Refresh the current screen. This helps in cases where the user connects to a
+ * serial interface after the screen has already been drawn.
+ * Five seconds is a nice compromise between not having the user wait too long
+ * and over-stressing certain OEM's terrible IPMI implementations.
+ */
+static int cui_refresh_timeout(void *arg)
+{
+	struct cui *cui = cui_from_arg(arg);
+
+	nc_scr_unpost(cui->current);
+	nc_scr_post(cui->current);
+	redrawwin(cui->current->main_ncw);
+
+	waiter_register_timeout(cui->waitset, 5000, cui_refresh_timeout, cui);
+
+	return 0;
+}
+
 /**
  * cui_handle_resize - Handle the term resize.
  */
@@ -1104,6 +1123,8 @@ retry_start:
 	waiter_register_io(cui->waitset, STDIN_FILENO, WAIT_IN,
 			cui_process_key, cui);
 
+	waiter_register_timeout(cui->waitset, 5000, cui_refresh_timeout, cui);
+
 	if (js_map) {
 
 		cui->pjs = pjs_init(cui, js_map);
-- 
2.13.2