path: root/dwm-anybar-20210926-a786211.diff

From c80bbb393b741bfa428fdbebc0027e6ff2c4b69d Mon Sep 17 00:00:00 2001
From: mihirlad55 <mihirlad55@gmail.com>
Date: Sun, 26 Sep 2021 00:36:41 +0000
Subject: [PATCH] Add support for managing external status bars

This patch allows dwm to manage other status bars such as
polybar/lemonbar without them needing to set override-redirect. For
all intents and purposes, DWM treats this bar as if it were its own
and as a result helps the status bar and DWM live in harmony.

This has a few advantages
* The bar does not block fullscreen windows
* DWM makes room for the status bar, so windows do not overlap the bar
* The bar can be hidden/killed and DWM will not keep an unsightly gap
  where the bar was
* DWM receives EnterNotify events when your cursor enters the bar

To use another status bar, set usealtbar to 1 in your config.h and set
altbarclass to the class name (can be found using xprop) to the class
name of your status bar. Also make sure that if your status bar will
be displayed on top, topbar is set to 1 in your config, and if it will
be displayed on bottom, topbar is set to 0. This patch does not
support bars that are not docked at the top or at the bottom of your
monitor.

The patch is developed at https://github.com/mihirlad55/dwm-anybar
---
 config.def.h |   3 ++
 dwm.c        | 114 ++++++++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 103 insertions(+), 14 deletions(-)

diff --git a/config.def.h b/config.def.h
index a2ac963..04ba79c 100644
--- a/config.def.h
+++ b/config.def.h
@@ -5,6 +5,9 @@ static const unsigned int borderpx  = 1;        /* border pixel of windows */
 static const unsigned int snap      = 32;       /* snap pixel */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 1;        /* 0 means bottom bar */
+static const int usealtbar          = 1;        /* 1 means use non-dwm status bar */
+static const char *altbarclass      = "Polybar"; /* Alternate bar class name */
+static const char *altbarcmd        = "$HOME/bar.sh"; /* Alternate bar launch command */
 static const char *fonts[]          = { "monospace:size=10" };
 static const char dmenufont[]       = "monospace:size=10";
 static const char col_gray1[]       = "#222222";
diff --git a/dwm.c b/dwm.c
index 5e4d494..5b83358 100644
--- a/dwm.c
+++ b/dwm.c
@@ -47,8 +47,8 @@
 /* macros */
 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
-#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
-                               * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
+#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->mx+(m)->mw) - MAX((x),(m)->mx)) \
+                               * MAX(0, MIN((y)+(h),(m)->my+(m)->mh) - MAX((y),(m)->my)))
 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
 #define LENGTH(X)               (sizeof X / sizeof X[0])
 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
@@ -116,7 +116,7 @@ struct Monitor {
 	float mfact;
 	int nmaster;
 	int num;
-	int by;               /* bar geometry */
+	int by, bh;           /* bar geometry */
 	int mx, my, mw, mh;   /* screen size */
 	int wx, wy, ww, wh;   /* window area  */
 	unsigned int seltags;
@@ -179,6 +179,7 @@ static void incnmaster(const Arg *arg);
 static void keypress(XEvent *e);
 static void killclient(const Arg *arg);
 static void manage(Window w, XWindowAttributes *wa);
+static void managealtbar(Window win, XWindowAttributes *wa);
 static void mappingnotify(XEvent *e);
 static void maprequest(XEvent *e);
 static void monocle(Monitor *m);
@@ -207,6 +208,7 @@ static void seturgent(Client *c, int urg);
 static void showhide(Client *c);
 static void sigchld(int unused);
 static void spawn(const Arg *arg);
+static void spawnbar();
 static void tag(const Arg *arg);
 static void tagmon(const Arg *arg);
 static void tile(Monitor *);
@@ -216,6 +218,7 @@ static void toggletag(const Arg *arg);
 static void toggleview(const Arg *arg);
 static void unfocus(Client *c, int setfocus);
 static void unmanage(Client *c, int destroyed);
+static void unmanagealtbar(Window w);
 static void unmapnotify(XEvent *e);
 static void updatebarpos(Monitor *m);
 static void updatebars(void);
@@ -230,6 +233,7 @@ static void updatewmhints(Client *c);
 static void view(const Arg *arg);
 static Client *wintoclient(Window w);
 static Monitor *wintomon(Window w);
+static int wmclasscontains(Window win, const char *class, const char *name);
 static int xerror(Display *dpy, XErrorEvent *ee);
 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 static int xerrorstart(Display *dpy, XErrorEvent *ee);
@@ -505,8 +509,10 @@ cleanupmon(Monitor *mon)
 		for (m = mons; m && m->next != mon; m = m->next);
 		m->next = mon->next;
 	}
-	XUnmapWindow(dpy, mon->barwin);
-	XDestroyWindow(dpy, mon->barwin);
+	if (!usealtbar) {
+		XUnmapWindow(dpy, mon->barwin);
+		XDestroyWindow(dpy, mon->barwin);
+	}
 	free(mon);
 }
 
@@ -568,7 +574,7 @@ configurenotify(XEvent *e)
 				for (c = m->clients; c; c = c->next)
 					if (c->isfullscreen)
 						resizeclient(c, m->mx, m->my, m->mw, m->mh);
-				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
+				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, m->bh);
 			}
 			focus(NULL);
 			arrange(NULL);
@@ -639,6 +645,7 @@ createmon(void)
 	m->nmaster = nmaster;
 	m->showbar = showbar;
 	m->topbar = topbar;
+	m->bh = bh;
 	m->lt[0] = &layouts[0];
 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
@@ -649,10 +656,13 @@ void
 destroynotify(XEvent *e)
 {
 	Client *c;
+	Monitor *m;
 	XDestroyWindowEvent *ev = &e->xdestroywindow;
 
 	if ((c = wintoclient(ev->window)))
 		unmanage(c, 1);
+	else if (usealtbar && (m = wintomon(ev->window)) && m->barwin == ev->window)
+		unmanagealtbar(ev->window);
 }
 
 void
@@ -696,6 +706,9 @@ dirtomon(int dir)
 void
 drawbar(Monitor *m)
 {
+	if (usealtbar)
+		return;
+
 	int x, w, tw = 0;
 	int boxs = drw->fonts->h / 9;
 	int boxw = drw->fonts->h / 6 + 2;
@@ -1077,6 +1090,25 @@ manage(Window w, XWindowAttributes *wa)
 	focus(NULL);
 }
 
+void
+managealtbar(Window win, XWindowAttributes *wa)
+{
+	Monitor *m;
+	if (!(m = recttomon(wa->x, wa->y, wa->width, wa->height)))
+		return;
+
+	m->barwin = win;
+	m->by = wa->y;
+	bh = m->bh = wa->height;
+	updatebarpos(m);
+	arrange(m);
+	XSelectInput(dpy, win, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
+	XMoveResizeWindow(dpy, win, wa->x, wa->y, wa->width, wa->height);
+	XMapWindow(dpy, win);
+	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
+		(unsigned char *) &win, 1);
+}
+
 void
 mappingnotify(XEvent *e)
 {
@@ -1097,7 +1129,9 @@ maprequest(XEvent *e)
 		return;
 	if (wa.override_redirect)
 		return;
-	if (!wintoclient(ev->window))
+	if (usealtbar && wmclasscontains(ev->window, altbarclass, ""))
+		managealtbar(ev->window, &wa);
+	else if (!wintoclient(ev->window))
 		manage(ev->window, &wa);
 }
 
@@ -1393,7 +1427,9 @@ scan(void)
 			if (!XGetWindowAttributes(dpy, wins[i], &wa)
 			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 				continue;
-			if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
+			if (usealtbar && wmclasscontains(wins[i], altbarclass, ""))
+				managealtbar(wins[i], &wa);
+			else if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
 				manage(wins[i], &wa);
 		}
 		for (i = 0; i < num; i++) { /* now the transients */
@@ -1546,7 +1582,7 @@ setup(void)
 	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
 		die("no fonts could be loaded.");
 	lrpad = drw->fonts->h;
-	bh = drw->fonts->h + 2;
+	bh = usealtbar ? 0 : drw->fonts->h + 2;
 	updategeom();
 	/* init atoms */
 	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
@@ -1595,6 +1631,7 @@ setup(void)
 	XSelectInput(dpy, root, wa.event_mask);
 	grabkeys();
 	focus(NULL);
+	spawnbar();
 }
 
 
@@ -1653,6 +1690,13 @@ spawn(const Arg *arg)
 	}
 }
 
+void
+spawnbar()
+{
+	if (*altbarcmd)
+		system(altbarcmd);
+}
+
 void
 tag(const Arg *arg)
 {
@@ -1704,7 +1748,7 @@ togglebar(const Arg *arg)
 {
 	selmon->showbar = !selmon->showbar;
 	updatebarpos(selmon);
-	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
+	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, selmon->bh);
 	arrange(selmon);
 }
 
@@ -1787,10 +1831,26 @@ unmanage(Client *c, int destroyed)
 	arrange(m);
 }
 
+void
+unmanagealtbar(Window w)
+{
+	Monitor *m = wintomon(w);
+
+	if (!m)
+		return;
+
+	m->barwin = 0;
+	m->by = 0;
+	m->bh = 0;
+	updatebarpos(m);
+	arrange(m);
+}
+
 void
 unmapnotify(XEvent *e)
 {
 	Client *c;
+	Monitor *m;
 	XUnmapEvent *ev = &e->xunmap;
 
 	if ((c = wintoclient(ev->window))) {
@@ -1798,12 +1858,16 @@ unmapnotify(XEvent *e)
 			setclientstate(c, WithdrawnState);
 		else
 			unmanage(c, 0);
-	}
+	} else if (usealtbar && (m = wintomon(ev->window)) && m->barwin == ev->window)
+		unmanagealtbar(ev->window);
 }
 
 void
 updatebars(void)
 {
+	if (usealtbar)
+		return;
+
 	Monitor *m;
 	XSetWindowAttributes wa = {
 		.override_redirect = True,
@@ -1829,11 +1893,11 @@ updatebarpos(Monitor *m)
 	m->wy = m->my;
 	m->wh = m->mh;
 	if (m->showbar) {
-		m->wh -= bh;
+		m->wh -= m->bh;
 		m->by = m->topbar ? m->wy : m->wy + m->wh;
-		m->wy = m->topbar ? m->wy + bh : m->wy;
+		m->wy = m->topbar ? m->wy + m->bh : m->wy;
 	} else
-		m->by = -bh;
+		m->by = -m->bh;
 }
 
 void
@@ -2077,6 +2141,28 @@ wintomon(Window w)
 	return selmon;
 }
 
+int
+wmclasscontains(Window win, const char *class, const char *name)
+{
+	XClassHint ch = { NULL, NULL };
+	int res = 1;
+
+	if (XGetClassHint(dpy, win, &ch)) {
+		if (ch.res_name && strstr(ch.res_name, name) == NULL)
+			res = 0;
+		if (ch.res_class && strstr(ch.res_class, class) == NULL)
+			res = 0;
+	} else
+		res = 0;
+
+	if (ch.res_class)
+		XFree(ch.res_class);
+	if (ch.res_name)
+		XFree(ch.res_name);
+
+	return res;
+}
+
 /* There's no way to check accesses to destroyed windows, thus those cases are
  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
  * default error handler, which may call exit. */
-- 
2.33.0