Adding zoomswap patch (pertag compatible)

README.md

@@ -11,7 +11,7 @@ Refer to [https://dwm.suckless.org/](https://dwm.suckless.org/) for details on t
 
 ### Changelog:
 
-2019-09-05 - Alpha, systray and pertag patches added
+2019-09-05 - Alpha, systray, pertag and zoomswap patches added
 
 ### Patches included:
 
@@ -23,3 +23,7 @@ Refer to [https://dwm.suckless.org/](https://dwm.suckless.org/) for details on t
 
    - [systray](https://dwm.suckless.org/patches/systray/)
       - adds system tray in the status bar
+
+   - [zoomswap](https://dwm.suckless.org/patches/zoomswap/)
+      - allows a master and a stack window to swap places rather than every window on the screen changing position
+

dwm.c

@@ -197,7 +197,9 @@ static void monocle(Monitor *m);
 static void motionnotify(XEvent *e);
 static void movemouse(const Arg *arg);
 static Client *nexttiled(Client *c);
+#if !ZOOMSWAP_PATCH
 static void pop(Client *);
+#endif // !ZOOMSWAP_PATCH
 static void propertynotify(XEvent *e);
 static void quit(const Arg *arg);
 static Monitor *recttomon(int x, int y, int w, int h);
@@ -1391,6 +1393,7 @@ nexttiled(Client *c)
 	return c;
 }
 
+#if !ZOOMSWAP_PATCH
 void
 pop(Client *c)
 {
@@ -1399,6 +1402,7 @@ pop(Client *c)
 	focus(c);
 	arrange(c->mon);
 }
+#endif // !ZOOMSWAP_PATCH
 
 void
 propertynotify(XEvent *e)
@@ -2506,14 +2510,66 @@ void
 zoom(const Arg *arg)
 {
 	Client *c = selmon->sel;
+	#if ZOOMSWAP_PATCH
+	Client *at = NULL, *cold, *cprevious = NULL, *p;
+	#endif // ZOOMSWAP_PATCH
 
 	if (!selmon->lt[selmon->sellt]->arrange
-	|| (selmon->sel && selmon->sel->isfloating))
+	|| (selmon->sel && selmon->sel->isfloating)
+	#if ZOOMSWAP_PATCH
+	|| !c
+	#endif // ZOOMSWAP_PATCH
+	)
 		return;
+
+	#if ZOOMSWAP_PATCH
+		if (c == nexttiled(selmon->clients)) {
+			#if PERTAG_PATCH
+			p = selmon->pertag->prevzooms[selmon->pertag->curtag];
+			#else
+			p = prevzoom;
+			#endif // PERTAG_PATCH
+			at = prevtiled(p);
+			if (at)
+				cprevious = nexttiled(at->next);
+			if (!cprevious || cprevious != p) {
+				#if PERTAG_PATCH
+				selmon->pertag->prevzooms[selmon->pertag->curtag] = NULL;
+				#else
+				prevzoom = NULL;
+				#endif // PERTAG_PATCH
+				if (!c || !(c = nexttiled(c->next)))
+					return;
+			} else
+				c = cprevious;
+		}
+
+		cold = nexttiled(selmon->clients);
+		if (c != cold && !at)
+			at = prevtiled(c);
+		detach(c);
+		attach(c);
+		/* swap windows instead of pushing the previous one down */
+		if (c != cold && at) {
+			#if PERTAG_PATCH
+			selmon->pertag->prevzooms[selmon->pertag->curtag] = cold;
+			#else
+			prevzoom = cold;
+			#endif // PERTAG_PATCH
+			if (cold && at != cold) {
+				detach(cold);
+				cold->next = at->next;
+				at->next = cold;
+			}
+		}
+		focus(c);
+		arrange(c->mon);
+	#else
 	if (c == nexttiled(selmon->clients))
 		if (!c || !(c = nexttiled(c->next)))
 			return;
 	pop(c);
+	#endif // ZOOMSWAP_PATCH
 }
 
 int

patch/include.c

@@ -9,3 +9,7 @@
 #if SYSTRAY_PATCH
 #include "systray.c"
 #endif
+
+#if ZOOMSWAP_PATCH
+#include "zoomswap.c"
+#endif // ZOOMSWAP_PATCH

patch/include.h

@@ -4,4 +4,8 @@
 
 #if SYSTRAY_PATCH
 #include "systray.h"
-#endif
+#endif
+
+#if ZOOMSWAP_PATCH
+#include "zoomswap.h"
+#endif // ZOOMSWAP_PATCH

patch/pertag.c

@@ -7,5 +7,7 @@ struct Pertag {
 	#if PERTAGBAR_PATCH
 	Bool showbars[LENGTH(tags) + 1]; /* display bar for the current tag */
 	#endif // PERTAGBAR_PATCH
+	#if ZOOMSWAP_PATCH
 	Client *prevzooms[LENGTH(tags) + 1]; /* store zoom information */
+	#endif // ZOOMSWAP_PATCH
 };

patch/zoomswap.c

@@ -0,0 +1,13 @@
+
+#if !PERTAG_PATCH
+static Client *prevzoom = NULL;
+#endif // PERTAG_PATCH
+
+Client *
+prevtiled(Client *c) {
+	Client *p;
+	if (!c || c == c->mon->clients)
+		return NULL;
+	for (p = c->mon->clients; p && p->next != c; p = p->next);
+	return p;
+}

patch/zoomswap.h

@@ -0,0 +1 @@
+static Client *prevtiled(Client *c);

patches.h

@@ -26,4 +26,10 @@
 /* This controls whether or not to also store bar position on a per
  * tag basis, or leave it as one bar per monitor.
  */
-#define PERTAGBAR_PATCH 0
+#define PERTAGBAR_PATCH 0
+
+/* The zoomswap patch allows a master and a stack window to swap places
+ * rather than every window on the screen changing position.
+ * https://dwm.suckless.org/patches/zoomswap/
+ */
+#define ZOOMSWAP_PATCH 0