From 9a37cd46b9151c0ff28b0f0a17a244fe44fcb1de Mon Sep 17 00:00:00 2001
From: Ian Laird <irlaird@gmail.com>
Date: Wed, 20 Aug 2025 18:35:45 -0700
Subject: [PATCH] Adds 2 methods to reapply rules to existing client windows.

---
 config.def.h |  2 ++
 dwm.c        | 32 ++++++++++++++++++++++++++++----
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/config.def.h b/config.def.h
index 9efa774..6b27df6 100644
--- a/config.def.h
+++ b/config.def.h
@@ -64,6 +64,8 @@ static const Key keys[] = {
 	/* modifier                     key        function        argument */
 	{ MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
 	{ MODKEY|ShiftMask,             XK_Return, spawn,          {.v = termcmd } },
+	{ MODKEY,                       XK_r,      runrulesfocused,{0} },
+	{ MODKEY|ShiftMask,             XK_r,      runrulesall,    {0} },
 	{ MODKEY,                       XK_b,      togglebar,      {0} },
 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
 	{ MODKEY,                       XK_k,      focusstack,     {.i = -1 } },
diff --git a/dwm.c b/dwm.c
index 1443802..bd3bcd5 100644
--- a/dwm.c
+++ b/dwm.c
@@ -141,7 +141,7 @@ typedef struct {
 } Rule;
 
 /* function declarations */
-static void applyrules(Client *c);
+static void applyrules(Client *c, int default_tags);
 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
 static void arrange(Monitor *m);
 static void arrangemon(Monitor *m);
@@ -193,6 +193,8 @@ static void resizeclient(Client *c, int x, int y, int w, int h);
 static void resizemouse(const Arg *arg);
 static void restack(Monitor *m);
 static void run(void);
+static void runrulesall(const Arg *args);
+static void runrulesfocused(const Arg *args);
 static void scan(void);
 static int sendevent(Client *c, Atom proto);
 static void sendmon(Client *c, Monitor *m);
@@ -275,7 +277,7 @@ struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 
 /* function implementations */
 void
-applyrules(Client *c)
+applyrules(Client *c, int default_tags)
 {
 	const char *class, *instance;
 	unsigned int i;
@@ -307,7 +309,7 @@ applyrules(Client *c)
 		XFree(ch.res_class);
 	if (ch.res_name)
 		XFree(ch.res_name);
-	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
+	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : default_tags ? default_tags : c->mon->tagset[c->mon->seltags];
 }
 
 int
@@ -1049,7 +1051,7 @@ manage(Window w, XWindowAttributes *wa)
 		c->tags = t->tags;
 	} else {
 		c->mon = selmon;
-		applyrules(c);
+		applyrules(c, 0);
 	}
 
 	if (c->x + WIDTH(c) > c->mon->wx + c->mon->ww)
@@ -1389,6 +1391,28 @@ run(void)
 			handler[ev.type](&ev); /* call handler */
 }
 
+static void
+runrulesfocused(const Arg *args)
+{
+	if (selmon->sel) {
+        applyrules(selmon->sel, 0);
+		focus(NULL);
+		arrange(selmon);
+	}
+}
+
+static void
+runrulesall(const Arg *args)
+{
+    for (Monitor *m = selmon; m; m=m->next) {
+        for (Client *c = m->clients; c; c = c->next) {
+            applyrules(c, c->tags);
+        }
+        arrange(m);
+    }
+    focus(NULL);
+}
+
 void
 scan(void)
 {
-- 
2.50.1