From 7521e7120a5e8516a1929d09f6706e131a09b852 Mon Sep 17 00:00:00 2001
From: Ray Chason <ray.chason@protonmail.com>
Date: Sat, 8 Aug 2026 18:17:06 -0400
Subject: [PATCH] Implement blink

---
 win/X11/winstat.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/win/X11/winstat.c b/win/X11/winstat.c
index 8d09f3ae2..7aee5fbb4 100644
--- a/win/X11/winstat.c
+++ b/win/X11/winstat.c
@@ -122,6 +122,7 @@ static void destroy_status_window_tty(struct xwindow *);
 static void adjust_status_fancy(struct xwindow *, const char *);
 static void adjust_status_tty(struct xwindow *, const char *);
 static void tty_status_exposed(Widget, XtPointer, XtPointer);
+static void tty_status_blink(XtPointer client_data, XtIntervalId *timer);
 static void tty_status_redraw(Widget);
 static int tty_render_text(Widget, int, int, const char *, int, int, boolean);
 
@@ -215,6 +216,8 @@ struct tty_cond_field {
 static Widget X11_status_widget;
 static struct tty_status_field X11_status_labels[MAXBLSTATS];
 static struct tty_cond_field X11_cond_labels[32]; /* Ugh */
+static boolean blink;
+static const unsigned long blink_interval = 500; /* milliseconds */
 #if 0 /*RLC*/
 static XFontStruct *X11_status_font;
 static Pixel X11_status_fg, X11_status_bg;
@@ -1121,6 +1124,8 @@ create_tty_status(Widget parent, Widget top)
 
     XtAddCallback(X11_status_widget, XtNexposeCallback, tty_status_exposed,
                   (XtPointer) 0);
+    XtAppAddTimeOut(app_context, blink_interval, tty_status_blink,
+                    (XtPointer) X11_status_widget);
 
 #if 0 /*RLC*/
     for (y = 0; y < X11_NUM_STATUS_LINES; y++) {
@@ -1163,6 +1168,30 @@ tty_status_exposed(Widget w, XtPointer client_data, /* unused */
     nhUse(widget_data);
 }
 
+static void
+tty_status_blink(XtPointer client_data, XtIntervalId *timer)
+{
+    Widget w = (Widget) client_data;
+    nhUse(timer);
+
+    /* Do we have any active blink attributes? */
+    boolean have_blink = FALSE;
+    for (unsigned i = 0; i < SIZE(X11_status_labels) && !have_blink; ++i) {
+        have_blink = (X11_status_labels[i].attrs & HL_BLINK) != 0;
+    }
+    for (unsigned i = 0; i < SIZE(X11_cond_labels) && !have_blink; ++i) {
+        have_blink = (X11_cond_labels[i].attrs & HL_BLINK) != 0;
+    }
+
+    if (have_blink) {
+        tty_status_redraw(w);
+        blink = !blink;
+    }
+
+    /* Do it again */
+    XtAppAddTimeOut(app_context, blink_interval, tty_status_blink, client_data);
+}
+
 static void
 tty_status_redraw(Widget w)
 {
@@ -1310,6 +1339,11 @@ tty_render_text(Widget w, int x, int y, const char *text, int color, int attr,
         bgpixel = (bgpixel & 0xFEFEFE) >> 1;
     }
 
+    /* Implement blink */
+    if ((attr & HL_BLINK) && blink) {
+        fgpixel = bgpixel;
+    }
+
     /* Get a graphics context */
     if (attr & HL_INVERSE) {
         values.foreground = bgpixel;