From 83923c1471d2d75c2872a5498258573ecfa05013 Mon Sep 17 00:00:00 2001
From: John Ankarstrom <john@ankarstrom.se>
Date: Thu, 1 Jul 2021 18:40:44 +0200
Subject: Add xchord utility

---
 Makefile |  7 ++++-
 xchord.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 98 insertions(+), 1 deletion(-)
 create mode 100644 xchord.c

diff --git a/Makefile b/Makefile
index ab5f525..415b07f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,9 @@
 BINDIR ?= /usr/local/bin
+CFLAGS = -I/usr/X11R7/include
+LDFLAGS = -L/usr/X11R7/lib -Wl,-R/usr/X11R7/lib -lXi
+
+xchord: xchord.c
 
 install:
-	ln -s $(PWD)/dwim $(BINDIR)/dwim
+	ln -sf $(PWD)/dwim $(BINDIR)/dwim
+	install xchord /usr/local/bin
diff --git a/xchord.c b/xchord.c
new file mode 100644
index 0000000..3ceef51
--- /dev/null
+++ b/xchord.c
@@ -0,0 +1,92 @@
+/*
+ *  xchord -- run dwim on button 1 + 3
+ *
+ *  This is a simple program that runs dwim whenever the right
+ *  mouse button is pressed while the left mouse button is held.
+ *
+ *  It does *not* block the button events.  That means that both
+ *  clicks will be registered by other programs.  This may be a
+ *  problem in programs that open a context menu on button 3.
+ *
+ *  On NetBSD, xchord should be compiled with the following flags:
+ *
+ *     CFLAGS = -I/usr/X11R7/include
+ *     LDFLAGS = -L/usr/X11R7/lib -Wl,-R/usr/X11R7/lib -lXi
+ *
+ *  xchord is written by John Ankarström <john (at) ankarstrom.se>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <X11/extensions/XInput2.h>
+#include <X11/Xlib.h>
+
+#define die(s, ...) do {			\
+	fprintf(stderr, "%s: ", argv[0]);	\
+	fprintf(stderr, __VA_ARGS__);		\
+	fprintf(stderr, "\n");			\
+	exit(s);				\
+} while (0)
+
+Display *dpy;
+Window rwin;
+
+int
+main(int argc, char *argv[])
+{
+	int p1;
+	unsigned char mask[(XI_LASTEVENT+7)/8];
+	XEvent ev;
+	XGenericEventCookie *cookie;
+	XIEvent *xiev;
+	XIEventMask evmasks[1];
+	XIRawEvent *rev;
+
+	dpy = XOpenDisplay(NULL);
+	if (!dpy) die(1, "could not open display");
+	rwin = DefaultRootWindow(dpy);
+
+	/* select events */
+	memset(mask, 0, sizeof(mask));
+
+	XISetMask(mask, XI_RawButtonPress);
+	XISetMask(mask, XI_RawButtonRelease);
+
+	evmasks[0].deviceid = XIAllMasterDevices;
+	evmasks[0].mask_len = sizeof(mask);
+	evmasks[0].mask = mask;
+
+	XISelectEvents(dpy, rwin, evmasks, 1);
+	XFlush(dpy);
+
+	cookie = &ev.xcookie;
+	p1 = 0;
+
+	/* watch for events */
+	for (;;) {
+		if (!XCheckTypedEvent(dpy, GenericEvent, &ev))
+			continue;
+		if (cookie->type != GenericEvent || !XGetEventData(dpy, cookie))
+			continue;
+
+		xiev = (XIEvent*)cookie->data;
+		rev = (XIRawEvent*)xiev;
+
+		switch (cookie->evtype) {
+		case XI_RawButtonPress:
+			/* button 1 pressed */
+			if (rev->detail == 1) p1 = 1;
+			/* button 1 + 3 pressed */
+			if (p1 && rev->detail == 3) system("dwim");
+			break;
+		case XI_RawButtonRelease:
+			/* button 1 released */
+			if (rev->detail == 1) p1 = 0;
+			break;
+		}
+
+		XFreeEventData(dpy, cookie);
+	}
+}
-- 
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