preserve on restart

dwm.c

@@ -75,7 +75,7 @@ enum { SchemeNorm, SchemeSel }; /* color schemes */
 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
        NetSystemTray, NetSystemTrayOP, NetSystemTrayOrientation, NetSystemTrayOrientationHorz,
        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
-       NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
+       NetWMWindowTypeDialog, NetClientList, NetClientInfo, NetLast }; /* EWMH atoms */
 enum { Manager, Xembed, XembedInfo, XLast }; /* Xembed atoms */
 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
@@ -224,6 +224,7 @@ static void scan(void);
 static int sendevent(Window w, Atom proto, int m, long d0, long d1, long d2, long d3, long d4);
 static void sendmon(Client *c, Monitor *m);
 static void setclientstate(Client *c, long state);
+static void setclienttagprop(Client *c);
 static void setfocus(Client *c);
 static void setfullscreen(Client *c, int fullscreen);
 static void setlayout(const Arg *arg);
@@ -1212,6 +1213,26 @@ manage(Window w, XWindowAttributes *wa)
 	updatewindowtype(c);
 	updatesizehints(c);
 	updatewmhints(c);
+	{
+		int format;
+		unsigned long *data, n, extra;
+		Monitor *m;
+		Atom atom;
+		if (XGetWindowProperty(dpy, c->win, netatom[NetClientInfo], 0L, 2L, False, XA_CARDINAL,
+				&atom, &format, &n, &extra, (unsigned char **)&data) == Success && n == 2) {
+			c->tags = *data;
+			for (m = mons; m; m = m->next) {
+				if (m->num == *(data+1)) {
+					c->mon = m;
+					break;
+				}
+			}
+		}
+		if (n > 0)
+			XFree(data);
+	}
+	setclienttagprop(c);
+
 	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
 	grabbuttons(c, 0);
 	if (!c->isfloating)
@@ -1625,6 +1646,7 @@ sendmon(Client *c, Monitor *m)
 	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
 	attach(c);
 	attachstack(c);
+	setclienttagprop(c);
 	focus(NULL);
 	arrange(NULL);
 }
@@ -1793,6 +1815,7 @@ setup(void)
 	xatom[Manager] = XInternAtom(dpy, "MANAGER", False);
 	xatom[Xembed] = XInternAtom(dpy, "_XEMBED", False);
 	xatom[XembedInfo] = XInternAtom(dpy, "_XEMBED_INFO", False);
+	netatom[NetClientInfo] = XInternAtom(dpy, "_NET_CLIENT_INFO", False);
 	/* init cursors */
 	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
 	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
@@ -1818,6 +1841,7 @@ setup(void)
 	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 		PropModeReplace, (unsigned char *) netatom, NetLast);
 	XDeleteProperty(dpy, root, netatom[NetClientList]);
+	XDeleteProperty(dpy, root, netatom[NetClientInfo]);
 	/* select events */
 	wa.cursor = cursor[CurNormal]->cursor;
 	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
@@ -1882,11 +1906,22 @@ spawn(const Arg *arg)
 	}
 }
 
+void
+setclienttagprop(Client *c)
+{
+	long data[] = { (long) c->tags, (long) c->mon->num };
+	XChangeProperty(dpy, c->win, netatom[NetClientInfo], XA_CARDINAL, 32,
+			PropModeReplace, (unsigned char *) data, 2);
+}
+
 void
 tag(const Arg *arg)
 {
+	Client *c;
 	if (selmon->sel && arg->ui & TAGMASK) {
+		c = selmon->sel;
 		selmon->sel->tags = arg->ui & TAGMASK;
+		setclienttagprop(c);
 		focus(NULL);
 		arrange(selmon);
 	}
@@ -1972,6 +2007,7 @@ toggletag(const Arg *arg)
 	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
 	if (newtags) {
 		selmon->sel->tags = newtags;
+		setclienttagprop(selmon->sel);
 		focus(NULL);
 		arrange(selmon);
 	}

patches/preserveonrestart-6.3.diff

@@ -0,0 +1,118 @@
+From 713fa8650f5a20006451ebcccf57a4512e83bae8 Mon Sep 17 00:00:00 2001
+From: Arda Atci <arda@phytech.io>
+Date: Wed, 18 May 2022 17:23:16 +0300
+Subject: [PATCH] preserve clients on old tags when renewing dwm
+
+By default, when dwm is recompiled-restarted all clients will
+lose it's current tag and collapse to first tag. This patch preserves
+clients on old tags, however note that layout order is not preserved.
+
+---
+ dwm.c | 38 +++++++++++++++++++++++++++++++++++++-
+ 1 file changed, 37 insertions(+), 1 deletion(-)
+
+diff --git a/dwm.c b/dwm.c
+index a96f33c..a12e0bd 100644
+--- a/dwm.c
++++ b/dwm.c
+@@ -62,7 +62,7 @@ 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, NetClientInfo, NetLast }; /* EWMH atoms */
+ enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
+ enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
+        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
+@@ -198,6 +198,7 @@ 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 setclienttagprop(Client *c);
+ static void setfocus(Client *c);
+ static void setfullscreen(Client *c, int fullscreen);
+ static void setlayout(const Arg *arg);
+@@ -1060,6 +1061,26 @@ manage(Window w, XWindowAttributes *wa)
+ 	updatewindowtype(c);
+ 	updatesizehints(c);
+ 	updatewmhints(c);
++	{
++		int format;
++		unsigned long *data, n, extra;
++		Monitor *m;
++		Atom atom;
++		if (XGetWindowProperty(dpy, c->win, netatom[NetClientInfo], 0L, 2L, False, XA_CARDINAL,
++				&atom, &format, &n, &extra, (unsigned char **)&data) == Success && n == 2) {
++			c->tags = *data;
++			for (m = mons; m; m = m->next) {
++				if (m->num == *(data+1)) {
++					c->mon = m;
++					break;
++				}
++			}
++		}
++		if (n > 0)
++			XFree(data);
++	}
++	setclienttagprop(c);
++
+ 	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
+ 	grabbuttons(c, 0);
+ 	if (!c->isfloating)
+@@ -1423,6 +1444,7 @@ sendmon(Client *c, Monitor *m)
+ 	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
+ 	attach(c);
+ 	attachstack(c);
++	setclienttagprop(c);
+ 	focus(NULL);
+ 	arrange(NULL);
+ }
+@@ -1566,6 +1588,7 @@ 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[NetClientInfo] = XInternAtom(dpy, "_NET_CLIENT_INFO", False);
+ 	/* init cursors */
+ 	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
+ 	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
+@@ -1589,6 +1612,7 @@ setup(void)
+ 	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
+ 		PropModeReplace, (unsigned char *) netatom, NetLast);
+ 	XDeleteProperty(dpy, root, netatom[NetClientList]);
++	XDeleteProperty(dpy, root, netatom[NetClientInfo]);
+ 	/* select events */
+ 	wa.cursor = cursor[CurNormal]->cursor;
+ 	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
+@@ -1656,11 +1680,22 @@ spawn(const Arg *arg)
+ 	}
+ }
+
++void
++setclienttagprop(Client *c)
++{
++	long data[] = { (long) c->tags, (long) c->mon->num };
++	XChangeProperty(dpy, c->win, netatom[NetClientInfo], XA_CARDINAL, 32,
++			PropModeReplace, (unsigned char *) data, 2);
++}
++
+ void
+ tag(const Arg *arg)
+ {
++	Client *c;
+ 	if (selmon->sel && arg->ui & TAGMASK) {
++		c = selmon->sel;
+ 		selmon->sel->tags = arg->ui & TAGMASK;
++		setclienttagprop(c);
+ 		focus(NULL);
+ 		arrange(selmon);
+ 	}
+@@ -1735,6 +1770,7 @@ toggletag(const Arg *arg)
+ 	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
+ 	if (newtags) {
+ 		selmon->sel->tags = newtags;
++		setclienttagprop(selmon->sel);
+ 		focus(NULL);
+ 		arrange(selmon);
+ 	}
+--
+2.36.1