From 6c58b480b7b6ce6a28beafc60a096069fbd51532 Mon Sep 17 00:00:00 2001
From: LeelaPakanati <LeelaPakanati.gmail.com>
Date: Fri, 13 Dec 2019 16:56:42 -0500
Subject: [PATCH] Add function handling at keyrelease

---
 config.def.h |  6 ++++++
 tabbed.c     | 30 +++++++++++++++++++++++++++++-
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/config.def.h b/config.def.h
index defa426..7bfda30 100644
--- a/config.def.h
+++ b/config.def.h
@@ -64,3 +64,9 @@ static Key keys[] = {
 
 	{ 0,                    XK_F11,    fullscreen,  { 0 } },
 };
+
+static Key keyreleases[] = {
+	/* modifier             key          function     argument */
+	{ 0,                    XK_Shift_L,  NULL,   { 0 } },
+
+};
diff --git a/tabbed.c b/tabbed.c
index ff3ada0..fe38b9d 100644
--- a/tabbed.c
+++ b/tabbed.c
@@ -113,6 +113,7 @@ static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 static void initfont(const char *fontstr);
 static Bool isprotodel(int c);
 static void keypress(const XEvent *e);
+static void keyrelease(const XEvent *e);
 static void killclient(const Arg *arg);
 static void manage(Window win);
 static void maprequest(const XEvent *e);
@@ -149,6 +150,7 @@ static void (*handler[LASTEvent]) (const XEvent *) = {
 	[Expose] = expose,
 	[FocusIn] = focusin,
 	[KeyPress] = keypress,
+	[KeyRelease] = keyrelease,
 	[MapRequest] = maprequest,
 	[PropertyNotify] = propertynotify,
 };
@@ -664,6 +666,22 @@ keypress(const XEvent *e)
 	}
 }
 
+void
+keyrelease(const XEvent *e)
+{
+	const XKeyEvent *ev = &e->xkey;
+	unsigned int i;
+	KeySym keysym;
+
+	keysym = XkbKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0, 0);
+	for (i = 0; i < LENGTH(keyreleases); i++) {
+		if (keysym == keyreleases[i].keysym &&
+		    CLEANMASK(keyreleases[i].mod) == CLEANMASK(ev->state) &&
+		    keyreleases[i].func)
+			keyreleases[i].func(&(keyreleases[i].arg));
+	}
+}
+
 void
 killclient(const Arg *arg)
 {
@@ -714,6 +732,16 @@ manage(Window w)
 			}
 		}
 
+		for (i = 0; i < LENGTH(keyreleases); i++) {
+			if ((code = XKeysymToKeycode(dpy, keyreleases[i].keysym))) {
+				for (j = 0; j < LENGTH(modifiers); j++) {
+					XGrabKey(dpy, code, keyreleases[i].mod |
+					         modifiers[j], w, True,
+					         GrabModeAsync, GrabModeAsync);
+				}
+			}
+		}
+
 		c = ecalloc(1, sizeof *c);
 		c->win = w;
 
@@ -1036,7 +1064,7 @@ setup(void)
 	XMapRaised(dpy, win);
 	XSelectInput(dpy, win, SubstructureNotifyMask | FocusChangeMask |
 	             ButtonPressMask | ExposureMask | KeyPressMask |
-	             PropertyChangeMask | StructureNotifyMask |
+	             KeyReleaseMask | PropertyChangeMask | StructureNotifyMask |
 	             SubstructureRedirectMask);
 	xerrorxlib = XSetErrorHandler(xerror);
 
-- 
2.24.0