From 354bf243ff0b3e93e890f3ee34cb85ba95135e8d Mon Sep 17 00:00:00 2001
From: davidpkj <davidpenkow1@gmail.com>
Date: Wed, 15 Feb 2023 10:45:48 +0100
Subject: Patch: visualbell2-basic-2020-05-13

---
 config.def.h |  8 ++++++++
 x.c          | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/config.def.h b/config.def.h
index aa8dfd0..37b85d1 100644
--- a/config.def.h
+++ b/config.def.h
@@ -73,6 +73,14 @@ static unsigned int cursorthickness = 2;
  */
 static int bellvolume = 0;
 
+/* visual-bell timeout in ms (0 to disable visual-bell) */
+static int vbelltimeout = 150;
+
+/* choose predefined visual-bell cells to inverse, or define your own logic */
+#define VBCELL x==0 || x==right || y==0 || y==bottom  /* border */
+// #define VBCELL 1  /* all cells - whole screen */
+// #define VBCELL y==bottom && x>right-2  /* bottom-right */
+
 /* default TERM value */
 char *termname = "st-256color";
 
diff --git a/x.c b/x.c
index ff4e284..39af5da 100644
--- a/x.c
+++ b/x.c
@@ -1704,6 +1704,27 @@ xsettitle(char *p)
 	XFree(prop.value);
 }
 
+
+static int vbellset = 0; /* 1 during visual bell, 0 otherwise */
+static struct timespec lastvbell = {0};
+
+static int
+isvbellcell(int x, int y)
+{
+	int right = win.tw / win.cw - 1, bottom = win.th / win.ch - 1;
+	return VBCELL;  /* logic condition defined at config.h */
+}
+
+static void
+vbellbegin() {
+	clock_gettime(CLOCK_MONOTONIC, &lastvbell);
+	if (vbellset)
+		return;
+	vbellset = 1;
+	redraw();
+	XFlush(xw.dpy);
+}
+
 int
 xstartdraw(void)
 {
@@ -1725,6 +1746,8 @@ xdrawline(Line line, int x1, int y1, int x2)
 			continue;
 		if (selected(x, y1))
 			new.mode ^= ATTR_REVERSE;
+		if (vbellset && isvbellcell(x, y1))
+			new.mode ^= ATTR_REVERSE;
 		if (i > 0 && ATTRCMP(base, new)) {
 			xdrawglyphfontspecs(specs, base, i, ox, y1);
 			specs += i;
@@ -1828,6 +1851,8 @@ xbell(void)
 		xseturgency(1);
 	if (bellvolume)
 		XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
+	if (vbelltimeout)
+		vbellbegin();
 }
 
 void
@@ -2080,6 +2105,16 @@ run(void)
 			}
 		}
 
+		if (vbellset) {
+			double remain = vbelltimeout - TIMEDIFF(now, lastvbell);
+			if (remain <= 0) {
+				vbellset = 0;
+				redraw();
+			} else if (timeout < 0 || remain < timeout) {
+				timeout = remain;
+			}
+		}
+
 		draw();
 		XFlush(xw.dpy);
 		drawing = 0;
-- 
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