Add window swallowing

https://dwm.suckless.org/patches/swallow/

config.def.h

@@ -31,9 +31,10 @@ static const Rule rules[] = {
 	 *	WM_CLASS(STRING) = instance, class
 	 *	WM_NAME(STRING) = title
 	 */
-	/* class      instance    title       tags mask     isfloating   monitor */
+	/* class      instance    title       tags mask     isfloating   isterminal noswallow monitor */
-	{ "Gimp",     NULL,       NULL,       0,            1,           -1 },
+	{ "Gimp",     NULL,       NULL,       0,            1,           0,         0,        -1 },
-	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           -1 },
+	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           0,         0,        -1 },
+	{ "st",       NULL,       NULL,       0,            0,           1,         1,        -1 },
 };
 
 /* layout(s) */

config.h

@@ -32,8 +32,11 @@ static const Rule rules[] = {
 	 *	WM_NAME(STRING) = title
 	 */
 	/* class      instance    title       tags mask     isfloating   monitor */
-    { "Virt-viewer", NULL,      NULL,                 1 << 8,        0,           -1 },
+    /* class      instance    title       tags mask     isfloating   isterminal noswallow monitor */
-    { "Firefox",     "Toolkit", "Picture-in-Picture", (1 << 9) - 1 , 0,           -1 }
+
+    {"Virt-viewer", NULL, NULL, 1 << 8, 0, 0, 0, -1},
+    {"Firefox", "Toolkit", "Picture-in-Picture", (1 << 9) - 1, 0, 0, 0, -1},
+    {"st", NULL, NULL, 0, 0, 1, 1, -1},
 };
 
 /* layout(s) */

config.mk

@@ -22,7 +22,7 @@ FREETYPEINC = /usr/include/freetype2
 
 # includes and libs
 INCS = -I${X11INC} -I${FREETYPEINC}
-LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
+LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS} -lX11-xcb -lxcb -lxcb-res
 
 # flags
 CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=2 -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}

dwm.c

@@ -40,6 +40,8 @@
 #include <X11/extensions/Xinerama.h>
 #endif /* XINERAMA */
 #include <X11/Xft/Xft.h>
+#include <X11/Xlib-xcb.h>
+#include <xcb/res.h>
 
 #include "drw.h"
 #include "util.h"
@@ -111,9 +113,11 @@ struct Client {
 	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 	int bw, oldbw;
 	unsigned int tags;
-	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
+	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen, isterminal, noswallow;
+	pid_t pid;
 	Client *next;
 	Client *snext;
+	Client *swallowing;
 	Monitor *mon;
 	Window win;
 };
@@ -158,6 +162,8 @@ typedef struct {
 	const char *title;
 	unsigned int tags;
 	int isfloating;
+	int isterminal;
+	int noswallow;
 	int monitor;
 } Rule;
 
@@ -198,6 +204,7 @@ static void focusin(XEvent *e);
 static void focusmon(const Arg *arg);
 static void focusstack(const Arg *arg);
 static Atom getatomprop(Client *c, Atom prop);
+static pid_t getparentprocess(pid_t p);
 static int getrootptr(int *x, int *y);
 static long getstate(Window w);
 static unsigned int getsystraywidth();
@@ -205,6 +212,7 @@ static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 static void grabbuttons(Client *c, int focused);
 static void grabkeys(void);
 static void incnmaster(const Arg *arg);
+static int isdescprocess(pid_t p, pid_t c);
 static void keypress(XEvent *e);
 static void killclient(const Arg *arg);
 static void manage(Window w, XWindowAttributes *wa);
@@ -241,9 +249,11 @@ static void seturgent(Client *c, int urg);
 static void showhide(Client *c);
 static void sigchld(int unused);
 static void spawn(const Arg *arg);
+static Client *swallowingclient(Window w);
 static Monitor *systraytomon(Monitor *m);
 static void tag(const Arg *arg);
 static void tagmon(const Arg *arg);
+static Client *termforwin(const Client *c);
 static void tile(Monitor *);
 static void togglebar(const Arg *arg);
 static void togglefloating(const Arg *arg);
@@ -266,6 +276,7 @@ static void updatetitle(Client *c);
 static void updatewindowtype(Client *c);
 static void updatewmhints(Client *c);
 static void view(const Arg *arg);
+static pid_t winpid(Window w);
 static Client *wintoclient(Window w);
 static Monitor *wintomon(Window w);
 static Client *wintosystrayicon(Window w);
@@ -310,6 +321,8 @@ static Drw *drw;
 static Monitor *mons, *selmon;
 static Window root, wmcheckwin;
 
+static xcb_connection_t *xcon;
+
 /* configuration, allows nested code to access above variables */
 #include "config.h"
 
@@ -339,6 +352,7 @@ applyrules(Client *c)
 		&& (!r->class || strstr(class, r->class))
 		&& (!r->instance || strstr(instance, r->instance)))
 		{
+			c->isterminal = r->isterminal;
 			c->isfloating = r->isfloating;
 			c->tags |= r->tags;
 			for (m = mons; m && m->num != r->monitor; m = m->next);
@@ -466,6 +480,48 @@ attachstack(Client *c)
 	c->mon->stack = c;
 }
 
+void
+swallow(Client *p, Client *c)
+{
+	if (c->noswallow || c->isterminal)
+		return;
+
+	detach(c);
+	detachstack(c);
+
+	setclientstate(c, WithdrawnState);
+	XUnmapWindow(dpy, p->win);
+
+	p->swallowing = c;
+	c->mon = p->mon;
+
+	Window w = p->win;
+	p->win = c->win;
+	c->win = w;
+	updatetitle(p);
+	arrange(p->mon);
+	XMoveResizeWindow(dpy, p->win, p->x, p->y, p->w, p->h);
+	configure(p);
+	updateclientlist();
+}
+
+void
+unswallow(Client *c)
+{
+	c->win = c->swallowing->win;
+
+	free(c->swallowing);
+	c->swallowing = NULL;
+
+	updatetitle(c);
+	arrange(c->mon);
+	XMapWindow(dpy, c->win);
+	XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
+	configure(c);
+	setclientstate(c, NormalState);
+	focus(c);
+}
+
 void
 buttonpress(XEvent *e)
 {
@@ -531,7 +587,7 @@ cleanup(void)
 	selmon->lt[selmon->sellt] = &foo;
 	for (m = mons; m; m = m->next)
 		while (m->stack)
-			unmanage(m->stack, 0);
+			unmanage(m->stack, 0); // XXX - unmanage swallowing windows too
 	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 	while (mons)
 		cleanupmon(mons);
@@ -759,6 +815,8 @@ destroynotify(XEvent *e)
 
 	if ((c = wintoclient(ev->window)))
 		unmanage(c, 1);
+    else if ((c = swallowingclient(ev->window)))
+        unmanage(c->swallowing, 1);
 	else if ((c = wintosystrayicon(ev->window))) {
 		removesystrayicon(c);
 		resizebarwin(selmon);
@@ -1153,12 +1211,13 @@ killclient(const Arg *arg)
 void
 manage(Window w, XWindowAttributes *wa)
 {
-	Client *c, *t = NULL;
+	Client *c, *t, *term = NULL;
 	Window trans = None;
 	XWindowChanges wc;
 
 	c = ecalloc(1, sizeof(Client));
 	c->win = w;
+    c->pid = winpid(w);
     /* geometry */
 	c->x = c->oldx = wa->x;
 	c->y = c->oldy = wa->y;
@@ -1173,6 +1232,7 @@ manage(Window w, XWindowAttributes *wa)
 	} else {
 		c->mon = selmon;
 		applyrules(c);
+		term = termforwin(c);
 	}
 
 	if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
@@ -1207,8 +1267,11 @@ manage(Window w, XWindowAttributes *wa)
 	if (c->mon == selmon)
 		unfocus(selmon->sel, 0);
 	c->mon->sel = c;
+	if (!term)
 		arrange(c->mon);
 	XMapWindow(dpy, c->win);
+	if (term)
+		swallow(term, c);
 	focus(NULL);
 }
 
@@ -2028,6 +2091,20 @@ unmanage(Client *c, int destroyed)
 	Monitor *m = c->mon;
 	XWindowChanges wc;
 
+    if (c->swallowing) {
+        unswallow(c);
+        return;
+    }
+
+    Client *s = swallowingclient(c->win);
+    if (s) {
+        free(s->swallowing);
+        s->swallowing = NULL;
+        arrange(m);
+        focus(NULL);
+        return;
+    }
+
 	detach(c);
 	detachstack(c);
 	if (!destroyed) {
@@ -2042,9 +2119,12 @@ unmanage(Client *c, int destroyed)
 		XUngrabServer(dpy);
 	}
 	free(c);
+
+	if (!s) {
+		arrange(m);
 		focus(NULL);
 		updateclientlist();
-	arrange(m);
+	}
 }
 
 void
@@ -2434,16 +2514,116 @@ view(const Arg *arg)
 	arrange(selmon);
 }
 
+pid_t
+winpid(Window w)
+{
+	pid_t result = 0;
+
+	xcb_res_client_id_spec_t spec = {0};
+	spec.client = w;
+	spec.mask = XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID;
+
+	xcb_generic_error_t *e = NULL;
+	xcb_res_query_client_ids_cookie_t c = xcb_res_query_client_ids(xcon, 1, &spec);
+	xcb_res_query_client_ids_reply_t *r = xcb_res_query_client_ids_reply(xcon, c, &e);
+
+	if (!r)
+		return (pid_t)0;
+
+	xcb_res_client_id_value_iterator_t i = xcb_res_query_client_ids_ids_iterator(r);
+	for (; i.rem; xcb_res_client_id_value_next(&i)) {
+		spec = i.data->spec;
+		if (spec.mask & XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID) {
+			uint32_t *t = xcb_res_client_id_value_value(i.data);
+			result = *t;
+			break;
+		}
+	}
+
+	free(r);
+
+	if (result == (pid_t)-1)
+		result = 0;
+	return result;
+}
+
+pid_t
+getparentprocess(pid_t p)
+{
+	unsigned int v = 0;
+
+#ifdef __linux__
+	FILE *f;
+	char buf[256];
+	snprintf(buf, sizeof(buf) - 1, "/proc/%u/stat", (unsigned)p);
+
+	if (!(f = fopen(buf, "r")))
+		return 0;
+
+	fscanf(f, "%*u %*s %*c %u", &v);
+	fclose(f);
+#endif /* __linux__ */
+
+	return (pid_t)v;
+}
+
+int
+isdescprocess(pid_t p, pid_t c)
+{
+	while (p != c && c != 0)
+		c = getparentprocess(c);
+
+	return (int)c;
+}
+
+Client *
+termforwin(const Client *w)
+{
+	Client *c;
+	Monitor *m;
+
+	if (!w->pid || w->isterminal)
+		return NULL;
+
+	for (m = mons; m; m = m->next) {
+		for (c = m->clients; c; c = c->next) {
+			if (c->isterminal && !c->swallowing && c->pid && isdescprocess(c->pid, w->pid))
+				return c;
+		}
+	}
+
+	return NULL;
+}
+
+Client *
+swallowingclient(Window w)
+{
+	Client *c;
+	Monitor *m;
+
+	for (m = mons; m; m = m->next) {
+		for (c = m->clients; c; c = c->next) {
+			if (c->swallowing && c->swallowing->win == w)
+				return c;
+		}
+	}
+
+	return NULL;
+}
+
 Client *
 wintoclient(Window w)
 {
 	Client *c;
 	Monitor *m;
 
-	for (m = mons; m; m = m->next)
+	for (m = mons; m; m = m->next) {
-		for (c = m->clients; c; c = c->next)
+		for (c = m->clients; c; c = c->next) {
 			if (c->win == w)
 				return c;
+		}
+	}
+
 	return NULL;
 }
 
@@ -2551,6 +2731,8 @@ main(int argc, char *argv[])
 		fputs("warning: no locale support\n", stderr);
 	if (!(dpy = XOpenDisplay(NULL)))
 		die("dwm: cannot open display");
+	if (!(xcon = XGetXCBConnection(dpy)))
+		die("dwm: cannot get xcb connection\n");
 	checkotherwm();
 	setup();
 #ifdef __OpenBSD__