From 44ad1a9255504ef36670f46101689b2ab9d8501e Mon Sep 17 00:00:00 2001
From: rangerlatham <ghanklatham@gmail.com>
Date: Sun, 31 Dec 2017 19:26:47 -0500
Subject: [PATCH] patch that adds ewmh functionality to dwm. see
 dwm.suckless.org/patches/ewmhtags for more details

---
 dwm.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

diff --git a/dwm.c b/dwm.c
index ec6a27c..018b7aa 100644
--- a/dwm.c
+++ b/dwm.c
@@ -55,6 +55,7 @@
 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
+#define TAGSLENGTH              (LENGTH(tags))
 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
 #define ColBorder               2
 
@@ -63,7 +64,7 @@ enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
 enum { SchemeNorm, SchemeSel }; /* color schemes */
 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
-       NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
+       NetWMWindowTypeDialog, NetClientList, NetDesktopNames, NetDesktopViewport, NetNumberOfDesktops, NetCurrentDesktop, NetLast }; /* EWMH atoms */
 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
@@ -198,11 +199,15 @@ static void scan(void);
 static int sendevent(Client *c, Atom proto);
 static void sendmon(Client *c, Monitor *m);
 static void setclientstate(Client *c, long state);
+static void setcurrentdesktop(void);
+static void setdesktopnames(void);
 static void setfocus(Client *c);
 static void setfullscreen(Client *c, int fullscreen);
 static void setlayout(const Arg *arg);
 static void setmfact(const Arg *arg);
+static void setnumdesktops(void);
 static void setup(void);
+static void setviewport(void);
 static void seturgent(Client *c, int urg);
 static void showhide(Client *c);
 static void sigchld(int unused);
@@ -217,6 +222,7 @@ static void toggleview(const Arg *arg);
 static void unfocus(Client *c, int setfocus);
 static void unmanage(Client *c, int destroyed);
 static void unmapnotify(XEvent *e);
+static void updatecurrentdesktop(void);
 static int updategeom(void);
 static void updatebarpos(Monitor *m);
 static void updatebars(void);
@@ -1432,6 +1438,16 @@ setclientstate(Client *c, long state)
 	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
 		PropModeReplace, (unsigned char *)data, 2);
 }
+void
+setcurrentdesktop(void){
+	long data[] = { 0 };
+	XChangeProperty(dpy, root, netatom[NetCurrentDesktop], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)data, 1);
+}
+void setdesktopnames(void){
+	XTextProperty text;
+	Xutf8TextListToTextProperty(dpy, tags, TAGSLENGTH, XUTF8StringStyle, &text);
+	XSetTextProperty(dpy, root, &text, netatom[NetDesktopNames]);
+}
 
 int
 sendevent(Client *c, Atom proto)
@@ -1527,6 +1543,12 @@ setmfact(const Arg *arg)
 	arrange(selmon);
 }
 
+void
+setnumdesktops(void){
+	long data[] = { TAGSLENGTH };
+	XChangeProperty(dpy, root, netatom[NetNumberOfDesktops], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)data, 1);
+}
+
 void
 setup(void)
 {
@@ -1563,6 +1585,10 @@ setup(void)
 	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
 	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
 	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
+	netatom[NetDesktopViewport] = XInternAtom(dpy, "_NET_DESKTOP_VIEWPORT", False);
+	netatom[NetNumberOfDesktops] = XInternAtom(dpy, "_NET_NUMBER_OF_DESKTOPS", False);
+	netatom[NetCurrentDesktop] = XInternAtom(dpy, "_NET_CURRENT_DESKTOP", False);
+	netatom[NetDesktopNames] = XInternAtom(dpy, "_NET_DESKTOP_NAMES", False);
 	/* init cursors */
 	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
 	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
@@ -1585,6 +1611,10 @@ setup(void)
 	/* EWMH support per view */
 	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 		PropModeReplace, (unsigned char *) netatom, NetLast);
+	setnumdesktops();
+	setcurrentdesktop();
+	setdesktopnames();
+	setviewport();
 	XDeleteProperty(dpy, root, netatom[NetClientList]);
 	/* select events */
 	wa.cursor = cursor[CurNormal]->cursor;
@@ -1596,6 +1626,11 @@ setup(void)
 	grabkeys();
 	focus(NULL);
 }
+void
+setviewport(void){
+	long data[] = { 0, 0 };
+	XChangeProperty(dpy, root, netatom[NetDesktopViewport], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)data, 2);
+}
 
 
 void
@@ -1745,6 +1780,7 @@ toggleview(const Arg *arg)
 		focus(NULL);
 		arrange(selmon);
 	}
+	updatecurrentdesktop();
 }
 
 void
@@ -1847,6 +1883,15 @@ updateclientlist()
 				XA_WINDOW, 32, PropModeAppend,
 				(unsigned char *) &(c->win), 1);
 }
+void updatecurrentdesktop(void){
+	long rawdata[] = { selmon->tagset[selmon->seltags] };
+	int i=0;
+	while(*rawdata >> i+1){
+		i++;
+	}
+	long data[] = { i };
+	XChangeProperty(dpy, root, netatom[NetCurrentDesktop], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)data, 1);
+}
 
 int
 updategeom(void)
@@ -2043,6 +2088,7 @@ view(const Arg *arg)
 		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
 	focus(NULL);
 	arrange(selmon);
+	updatecurrentdesktop();
 }
 
 Client *
-- 
2.15.1