From 2433e0499e4607d39a3f511449f9466886055914 Mon Sep 17 00:00:00 2001
From: Bakkeby <bakkeby@gmail.com>
Date: Mon, 10 Jan 2022 14:06:10 +0100
Subject: [PATCH 1/2] Bar Modules - splits the bar functionality into
 individual  segments that can be re-arranged

---
 config.def.h         |  20 +++
 dwm.c                | 393 ++++++++++++++++++++++++++++++++-----------
 patch/bar_ltsymbol.c |  17 ++
 patch/bar_ltsymbol.h |   3 +
 patch/bar_status.c   |  19 +++
 patch/bar_status.h   |   3 +
 patch/bar_tags.c     |  55 ++++++
 patch/bar_tags.h     |   3 +
 patch/bar_wintitle.c |  31 ++++
 patch/bar_wintitle.h |   3 +
 patch/include.c      |   5 +
 patch/include.h      |   5 +
 12 files changed, 458 insertions(+), 99 deletions(-)
 create mode 100644 patch/bar_ltsymbol.c
 create mode 100644 patch/bar_ltsymbol.h
 create mode 100644 patch/bar_status.c
 create mode 100644 patch/bar_status.h
 create mode 100644 patch/bar_tags.c
 create mode 100644 patch/bar_tags.h
 create mode 100644 patch/bar_wintitle.c
 create mode 100644 patch/bar_wintitle.h
 create mode 100644 patch/include.c
 create mode 100644 patch/include.h

diff --git a/config.def.h b/config.def.h
index a2ac963..f870c41 100644
--- a/config.def.h
+++ b/config.def.h
@@ -31,6 +31,26 @@ static const Rule rules[] = {
 	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           -1 },
 };
 
+/* Bar rules allow you to configure what is shown where on the bar, as well as
+ * introducing your own bar modules.
+ *
+ *    monitor:
+ *      -1  show on all monitors
+ *       0  show on monitor 0
+ *      'A' show on active monitor (i.e. focused / selected) (or just -1 for active?)
+ *    bar - bar index, 0 is default, 1 is extrabar
+ *    alignment - how the module is aligned compared to other modules
+ *    widthfunc, drawfunc, clickfunc - providing bar module width, draw and click functions
+ *    name - does nothing, intended for visual clue and for logging / debugging
+ */
+static const BarRule barrules[] = {
+	/* monitor  bar    alignment         widthfunc              drawfunc              clickfunc           name */
+	{ -1,       0,     BAR_ALIGN_LEFT,   width_tags,            draw_tags,            click_tags,         "tags" },
+	{ -1,       0,     BAR_ALIGN_LEFT,   width_ltsymbol,        draw_ltsymbol,        click_ltsymbol,     "layout" },
+	{ 'A',      0,     BAR_ALIGN_RIGHT,  width_status,          draw_status,          click_status,       "status" },
+	{ -1,       0,     BAR_ALIGN_NONE,   width_wintitle,        draw_wintitle,        click_wintitle,     "wintitle" },
+};
+
 /* layout(s) */
 static const float mfact     = 0.55; /* factor of master area size [0.05..0.95] */
 static const int nmaster     = 1;    /* number of clients in master area */
diff --git a/dwm.c b/dwm.c
index a96f33c..86763d8 100644
--- a/dwm.c
+++ b/dwm.c
@@ -45,6 +45,7 @@
 #include "util.h"
 
 /* macros */
+#define BARRULES                20
 #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)) \
@@ -66,6 +67,19 @@ enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
+enum {
+	BAR_ALIGN_LEFT,
+	BAR_ALIGN_CENTER,
+	BAR_ALIGN_RIGHT,
+	BAR_ALIGN_LEFT_LEFT,
+	BAR_ALIGN_LEFT_RIGHT,
+	BAR_ALIGN_LEFT_CENTER,
+	BAR_ALIGN_NONE,
+	BAR_ALIGN_RIGHT_LEFT,
+	BAR_ALIGN_RIGHT_RIGHT,
+	BAR_ALIGN_RIGHT_CENTER,
+	BAR_ALIGN_LAST
+}; /* bar alignment */
 
 typedef union {
 	int i;
@@ -74,6 +88,46 @@ typedef union {
 	const void *v;
 } Arg;
 
+typedef struct Monitor Monitor;
+typedef struct Bar Bar;
+struct Bar {
+	Window win;
+	Monitor *mon;
+	Bar *next;
+	int idx;
+	int topbar;
+	int bx, by, bw, bh; /* bar geometry */
+	int w[BARRULES]; // module width
+	int x[BARRULES]; // module position
+};
+
+typedef struct {
+	int max_width;
+} BarWidthArg;
+
+typedef struct {
+	int x;
+	int w;
+} BarDrawArg;
+
+typedef struct {
+	int rel_x;
+	int rel_y;
+	int rel_w;
+	int rel_h;
+} BarClickArg;
+
+typedef struct {
+	int monitor;
+	int bar;
+	int alignment; // see bar alignment enum
+	int (*widthfunc)(Bar *bar, BarWidthArg *a);
+	int (*drawfunc)(Bar *bar, BarDrawArg *a);
+	int (*clickfunc)(Bar *bar, Arg *arg, BarClickArg *a);
+	char *name; // for debugging
+	int x, w; // position, width for internal use
+} BarRule;
+
 typedef struct {
 	unsigned int click;
 	unsigned int mask;
@@ -82,7 +136,6 @@ typedef struct {
 	const Arg arg;
 } Button;
 
-typedef struct Monitor Monitor;
 typedef struct Client Client;
 struct Client {
 	char name[256];
@@ -116,19 +169,17 @@ struct Monitor {
 	float mfact;
 	int nmaster;
 	int num;
-	int by;               /* bar geometry */
 	int mx, my, mw, mh;   /* screen size */
 	int wx, wy, ww, wh;   /* window area  */
 	unsigned int seltags;
 	unsigned int sellt;
 	unsigned int tagset[2];
 	int showbar;
-	int topbar;
 	Client *clients;
 	Client *sel;
 	Client *stack;
 	Monitor *next;
-	Window barwin;
+	Bar *bar;
 	const Layout *lt[2];
 };
 
@@ -163,6 +214,7 @@ static void detachstack(Client *c);
 static Monitor *dirtomon(int dir);
 static void drawbar(Monitor *m);
 static void drawbars(void);
+static void drawbarwin(Bar *bar);
 static void enternotify(XEvent *e);
 static void expose(XEvent *e);
 static void focus(Client *c);
@@ -235,12 +287,13 @@ static int xerrordummy(Display *dpy, XErrorEvent *ee);
 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 static void zoom(const Arg *arg);
 
+#include "patch/include.h"
 /* variables */
 static const char broken[] = "broken";
 static char stext[256];
 static int screen;
 static int sw, sh;           /* X display screen geometry width, height */
-static int bh, blw = 0;      /* bar geometry */
+static int bh;               /* bar geometry */
 static int lrpad;            /* sum of left and right padding for text */
 static int (*xerrorxlib)(Display *, XErrorEvent *);
 static unsigned int numlockmask = 0;
@@ -272,6 +325,8 @@ static Window root, wmcheckwin;
 /* configuration, allows nested code to access above variables */
 #include "config.h"
 
+#include "patch/include.c"
+
 /* compile-time check if all tags fit into an unsigned int bit array. */
 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 
@@ -417,43 +472,61 @@ attachstack(Client *c)
 void
 buttonpress(XEvent *e)
 {
-	unsigned int i, x, click;
+	int click, i, r, mi;
 	Arg arg = {0};
 	Client *c;
 	Monitor *m;
+	Bar *bar;
 	XButtonPressedEvent *ev = &e->xbutton;
+	const BarRule *br;
+	BarClickArg carg = { 0, 0, 0, 0 };
 
 	click = ClkRootWin;
 	/* focus monitor if necessary */
-	if ((m = wintomon(ev->window)) && m != selmon) {
+	if ((m = wintomon(ev->window)) && m != selmon
+	) {
 		unfocus(selmon->sel, 1);
 		selmon = m;
 		focus(NULL);
 	}
-	if (ev->window == selmon->barwin) {
-		i = x = 0;
-		do
-			x += TEXTW(tags[i]);
-		while (ev->x >= x && ++i < LENGTH(tags));
-		if (i < LENGTH(tags)) {
-			click = ClkTagBar;
-			arg.ui = 1 << i;
-		} else if (ev->x < x + blw)
-			click = ClkLtSymbol;
-		else if (ev->x > selmon->ww - (int)TEXTW(stext))
-			click = ClkStatusText;
-		else
-			click = ClkWinTitle;
-	} else if ((c = wintoclient(ev->window))) {
+
+	for (mi = 0, m = mons; m && m != selmon; m = m->next, mi++); // get the monitor index
+	for (bar = selmon->bar; bar; bar = bar->next) {
+		if (ev->window == bar->win) {
+			for (r = 0; r < LENGTH(barrules); r++) {
+				br = &barrules[r];
+				if (br->bar != bar->idx || (br->monitor == 'A' && m != selmon) || br->clickfunc == NULL)
+					continue;
+				if (br->monitor != 'A' && br->monitor != -1 && br->monitor != mi)
+					continue;
+				if (bar->x[r] <= ev->x && ev->x <= bar->x[r] + bar->w[r]) {
+					carg.rel_x = ev->x - bar->x[r];
+					carg.rel_y = ev->y;
+					carg.rel_w = bar->w[r];
+					carg.rel_h = bar->bh;
+					click = br->clickfunc(bar, &arg, &carg);
+					if (click < 0)
+						return;
+					break;
+				}
+			}
+			break;
+		}
+	}
+
+	if (click == ClkRootWin && (c = wintoclient(ev->window))) {
 		focus(c);
 		restack(selmon);
 		XAllowEvents(dpy, ReplayPointer, CurrentTime);
 		click = ClkClientWin;
 	}
-	for (i = 0; i < LENGTH(buttons); i++)
+
+	for (i = 0; i < LENGTH(buttons); i++) {
 		if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
-		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
+				&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state)) {
 			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
+		}
+	}
 }
 
 void
@@ -498,6 +571,7 @@ void
 cleanupmon(Monitor *mon)
 {
 	Monitor *m;
+	Bar *bar;
 
 	if (mon == mons)
 		mons = mons->next;
@@ -505,8 +579,12 @@ 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);
+	for (bar = mon->bar; bar; bar = mon->bar) {
+		XUnmapWindow(dpy, bar->win);
+		XDestroyWindow(dpy, bar->win);
+		mon->bar = bar->next;
+		free(bar);
+	}
 	free(mon);
 }
 
@@ -552,6 +630,7 @@ void
 configurenotify(XEvent *e)
 {
 	Monitor *m;
+	Bar *bar;
 	Client *c;
 	XConfigureEvent *ev = &e->xconfigure;
 	int dirty;
@@ -568,7 +647,8 @@ 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);
+				for (bar = m->bar; bar; bar = bar->next)
+					XMoveResizeWindow(dpy, bar->win, bar->bx, bar->by, bar->bw, bar->bh);
 			}
 			focus(NULL);
 			arrange(NULL);
@@ -631,17 +711,40 @@ configurerequest(XEvent *e)
 Monitor *
 createmon(void)
 {
-	Monitor *m;
+	Monitor *m, *mon;
+	int i, n, mi, max_bars = 2, istopbar = topbar;
+
+	const BarRule *br;
+	Bar *bar;
 
 	m = ecalloc(1, sizeof(Monitor));
 	m->tagset[0] = m->tagset[1] = 1;
 	m->mfact = mfact;
 	m->nmaster = nmaster;
 	m->showbar = showbar;
-	m->topbar = topbar;
+
+	for (mi = 0, mon = mons; mon; mon = mon->next, mi++); // monitor index
 	m->lt[0] = &layouts[0];
 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
+
+	/* Derive the number of bars for this monitor based on bar rules */
+	for (n = -1, i = 0; i < LENGTH(barrules); i++) {
+		br = &barrules[i];
+		if (br->monitor == 'A' || br->monitor == -1 || br->monitor == mi)
+			n = MAX(br->bar, n);
+	}
+
+	for (i = 0; i <= n && i < max_bars; i++) {
+		bar = ecalloc(1, sizeof(Bar));
+		bar->mon = m;
+		bar->idx = i;
+		bar->next = m->bar;
+		bar->topbar = istopbar;
+		m->bar = bar;
+		istopbar = !istopbar;
+	}
+
 	return m;
 }
 
@@ -696,65 +799,117 @@ dirtomon(int dir)
 void
 drawbar(Monitor *m)
 {
-	int x, w, tw = 0;
-	int boxs = drw->fonts->h / 9;
-	int boxw = drw->fonts->h / 6 + 2;
-	unsigned int i, occ = 0, urg = 0;
-	Client *c;
-
-	if (!m->showbar)
-		return;
-
-	/* draw status first so it can be overdrawn by tags later */
-	if (m == selmon) { /* status is only drawn on selected monitor */
-		drw_setscheme(drw, scheme[SchemeNorm]);
-		tw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
-		drw_text(drw, m->ww - tw, 0, tw, bh, 0, stext, 0);
-	}
-
-	for (c = m->clients; c; c = c->next) {
-		occ |= c->tags;
-		if (c->isurgent)
-			urg |= c->tags;
-	}
-	x = 0;
-	for (i = 0; i < LENGTH(tags); i++) {
-		w = TEXTW(tags[i]);
-		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
-		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
-		if (occ & 1 << i)
-			drw_rect(drw, x + boxs, boxs, boxw, boxw,
-				m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
-				urg & 1 << i);
-		x += w;
-	}
-	w = blw = TEXTW(m->ltsymbol);
-	drw_setscheme(drw, scheme[SchemeNorm]);
-	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
-
-	if ((w = m->ww - tw - x) > bh) {
-		if (m->sel) {
-			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
-			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
-			if (m->sel->isfloating)
-				drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
-		} else {
-			drw_setscheme(drw, scheme[SchemeNorm]);
-			drw_rect(drw, x, 0, w, bh, 1, 1);
-		}
-	}
-	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
+	Bar *bar;
+	for (bar = m->bar; bar; bar = bar->next)
+		drawbarwin(bar);
 }
 
 void
 drawbars(void)
 {
 	Monitor *m;
-
 	for (m = mons; m; m = m->next)
 		drawbar(m);
 }
 
+void
+drawbarwin(Bar *bar)
+{
+	if (!bar->win)
+		return;
+	Monitor *mon;
+	int r, w, mi;
+	int rx, lx, rw, lw; // bar size, split between left and right if a center module is added
+	const BarRule *br;
+	BarWidthArg warg = { 0 };
+	BarDrawArg darg  = { 0, 0 };
+
+	for (mi = 0, mon = mons; mon && mon != bar->mon; mon = mon->next, mi++); // get the monitor index
+	rw = lw = bar->bw;
+	rx = lx = 0;
+
+	drw_setscheme(drw, scheme[SchemeNorm]);
+	drw_rect(drw, lx, 0, lw, bh, 1, 1);
+	for (r = 0; r < LENGTH(barrules); r++) {
+		br = &barrules[r];
+		if (br->bar != bar->idx || br->drawfunc == NULL || (br->monitor == 'A' && bar->mon != selmon))
+			continue;
+		if (br->monitor != 'A' && br->monitor != -1 && br->monitor != mi)
+			continue;
+		drw_setscheme(drw, scheme[SchemeNorm]);
+		warg.max_width = (br->alignment < BAR_ALIGN_RIGHT_LEFT ? lw : rw);
+		w = br->widthfunc(bar, &warg);
+		w = MIN(warg.max_width, w);
+
+		if (lw <= 0) { // if left is exhausted then switch to right side, and vice versa
+			lw = rw;
+			lx = rx;
+		} else if (rw <= 0) {
+			rw = lw;
+			rx = lx;
+		}
+
+		switch(br->alignment) {
+		default:
+		case BAR_ALIGN_NONE:
+		case BAR_ALIGN_LEFT_LEFT:
+		case BAR_ALIGN_LEFT:
+			bar->x[r] = lx;
+			if (lx == rx) {
+				rx += w;
+				rw -= w;
+			}
+			lx += w;
+			lw -= w;
+			break;
+		case BAR_ALIGN_LEFT_RIGHT:
+		case BAR_ALIGN_RIGHT:
+			bar->x[r] = lx + lw - w;
+			if (lx == rx)
+				rw -= w;
+			lw -= w;
+			break;
+		case BAR_ALIGN_LEFT_CENTER:
+		case BAR_ALIGN_CENTER:
+			bar->x[r] = lx + lw / 2 - w / 2;
+			if (lx == rx) {
+				rw = rx + rw - bar->x[r] - w;
+				rx = bar->x[r] + w;
+			}
+			lw = bar->x[r] - lx;
+			break;
+		case BAR_ALIGN_RIGHT_LEFT:
+			bar->x[r] = rx;
+			if (lx == rx) {
+				lx += w;
+				lw -= w;
+			}
+			rx += w;
+			rw -= w;
+			break;
+		case BAR_ALIGN_RIGHT_RIGHT:
+			bar->x[r] = rx + rw - w;
+			if (lx == rx)
+				lw -= w;
+			rw -= w;
+			break;
+		case BAR_ALIGN_RIGHT_CENTER:
+			bar->x[r] = rx + rw / 2 - w / 2;
+			if (lx == rx) {
+				lw = lx + lw - bar->x[r] + w;
+				lx = bar->x[r] + w;
+			}
+			rw = bar->x[r] - rx;
+			break;
+		}
+		bar->w[r] = w;
+		darg.x = bar->x[r];
+		darg.w = bar->w[r];
+		br->drawfunc(bar, &darg);
+	}
+	drw_map(drw, bar->win, 0, 0, bar->bw, bar->bh);
+}
+
 void
 enternotify(XEvent *e)
 {
@@ -1049,7 +1204,7 @@ manage(Window w, XWindowAttributes *wa)
 		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
 	c->x = MAX(c->x, c->mon->mx);
 	/* only fix client y-offset, if the client center might cover the bar */
-	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
+	c->y = MAX(c->y, ((c->mon->bar->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
 		&& (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
 	c->bw = borderpx;
 
@@ -1236,7 +1391,8 @@ propertynotify(XEvent *e)
 			break;
 		case XA_WM_HINTS:
 			updatewmhints(c);
-			drawbars();
+			if (c->isurgent)
+				drawbars();
 			break;
 		}
 		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
@@ -1362,7 +1518,7 @@ restack(Monitor *m)
 		XRaiseWindow(dpy, m->sel->win);
 	if (m->lt[m->sellt]->arrange) {
 		wc.stack_mode = Below;
-		wc.sibling = m->barwin;
+		wc.sibling = m->bar->win;
 		for (c = m->stack; c; c = c->snext)
 			if (!c->isfloating && ISVISIBLE(c)) {
 				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
@@ -1705,9 +1861,11 @@ tile(Monitor *m)
 void
 togglebar(const Arg *arg)
 {
+	Bar *bar;
 	selmon->showbar = !selmon->showbar;
 	updatebarpos(selmon);
-	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
+	for (bar = selmon->bar; bar; bar = bar->next)
+		XMoveResizeWindow(dpy, bar->win, bar->bx, bar->by, bar->bw, bar->bh);
 	arrange(selmon);
 }
 
@@ -1807,22 +1965,37 @@ unmapnotify(XEvent *e)
 void
 updatebars(void)
 {
+	Bar *bar;
 	Monitor *m;
 	XSetWindowAttributes wa = {
 		.override_redirect = True,
+		#if BAR_ALPHA_PATCH
+		.background_pixel = 0,
+		.border_pixel = 0,
+		.colormap = cmap,
+		#else
 		.background_pixmap = ParentRelative,
+		#endif // BAR_ALPHA_PATCH
 		.event_mask = ButtonPressMask|ExposureMask
 	};
 	XClassHint ch = {"dwm", "dwm"};
 	for (m = mons; m; m = m->next) {
-		if (m->barwin)
-			continue;
-		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
-				CopyFromParent, DefaultVisual(dpy, screen),
-				CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
-		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
-		XMapRaised(dpy, m->barwin);
-		XSetClassHint(dpy, m->barwin, &ch);
+		for (bar = m->bar; bar; bar = bar->next) {
+			if (!bar->win) {
+				#if BAR_ALPHA_PATCH
+				bar->win = XCreateWindow(dpy, root, bar->bx, bar->by, bar->bw, bar->bh, 0, depth,
+						InputOutput, visual,
+						CWOverrideRedirect|CWBackPixel|CWBorderPixel|CWColormap|CWEventMask, &wa);
+				#else
+				bar->win = XCreateWindow(dpy, root, bar->bx, bar->by, bar->bw, bar->bh, 0, DefaultDepth(dpy, screen),
+						CopyFromParent, DefaultVisual(dpy, screen),
+						CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
+				#endif // BAR_ALPHA_PATCH
+				XDefineCursor(dpy, bar->win, cursor[CurNormal]->cursor);
+				XMapRaised(dpy, bar->win);
+				XSetClassHint(dpy, bar->win, &ch);
+			}
+		}
 	}
 }
 
@@ -1831,12 +2004,30 @@ updatebarpos(Monitor *m)
 {
 	m->wy = m->my;
 	m->wh = m->mh;
-	if (m->showbar) {
-		m->wh -= bh;
-		m->by = m->topbar ? m->wy : m->wy + m->wh;
-		m->wy = m->topbar ? m->wy + bh : m->wy;
-	} else
-		m->by = -bh;
+	int num_bars;
+	Bar *bar;
+	int y_pad = 0;
+	int x_pad = 0;
+
+	for (bar = m->bar; bar; bar = bar->next) {
+		bar->bx = m->mx + x_pad;
+		bar->bw = m->ww - 2 * x_pad;
+		bar->bh = bh;
+	}
+
+	if (!m->showbar) {
+		for (bar = m->bar; bar; bar = bar->next)
+			bar->by = -bh - y_pad;
+		return;
+	}
+
+	for (num_bars = 0, bar = m->bar; bar; bar = bar->next, num_bars++)
+		if (bar->topbar)
+			m->wy = m->my + bh + y_pad;
+	m->wh = m->wh - y_pad * num_bars - bh * num_bars;
+
+	for (bar = m->bar; bar; bar = bar->next)
+		bar->by = (bar->topbar ? m->wy - bh : m->wy + m->wh);
 }
 
 void
@@ -1993,9 +2184,11 @@ updatesizehints(Client *c)
 void
 updatestatus(void)
 {
+	Monitor *m;
 	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
 		strcpy(stext, "dwm-"VERSION);
-	drawbar(selmon);
+	for (m = mons; m; m = m->next)
+		drawbar(m);
 }
 
 void
@@ -2069,12 +2262,14 @@ wintomon(Window w)
 	int x, y;
 	Client *c;
 	Monitor *m;
+	Bar *bar;
 
 	if (w == root && getrootptr(&x, &y))
 		return recttomon(x, y, 1, 1);
 	for (m = mons; m; m = m->next)
-		if (w == m->barwin)
-			return m;
+		for (bar = m->bar; bar; bar = bar->next)
+			if (w == bar->win)
+				return m;
 	if ((c = wintoclient(w)))
 		return c->mon;
 	return selmon;
diff --git a/patch/bar_ltsymbol.c b/patch/bar_ltsymbol.c
new file mode 100644
index 0000000..6676a2a
--- /dev/null
+++ b/patch/bar_ltsymbol.c
@@ -0,0 +1,17 @@
+int
+width_ltsymbol(Bar *bar, BarWidthArg *a)
+{
+	return TEXTW(bar->mon->ltsymbol);
+}
+
+int
+draw_ltsymbol(Bar *bar, BarDrawArg *a)
+{
+	return drw_text(drw, a->x, 0, a->w, bh, lrpad / 2, bar->mon->ltsymbol, 0);
+}
+
+int
+click_ltsymbol(Bar *bar, Arg *arg, BarClickArg *a)
+{
+	return ClkLtSymbol;
+}
diff --git a/patch/bar_ltsymbol.h b/patch/bar_ltsymbol.h
new file mode 100644
index 0000000..d9c79bf
--- /dev/null
+++ b/patch/bar_ltsymbol.h
@@ -0,0 +1,3 @@
+static int width_ltsymbol(Bar *bar, BarWidthArg *a);
+static int draw_ltsymbol(Bar *bar, BarDrawArg *a);
+static int click_ltsymbol(Bar *bar, Arg *arg, BarClickArg *a);
diff --git a/patch/bar_status.c b/patch/bar_status.c
new file mode 100644
index 0000000..7d27282
--- /dev/null
+++ b/patch/bar_status.c
@@ -0,0 +1,19 @@
+int
+width_status(Bar *bar, BarWidthArg *a)
+{
+	return TEXTW(stext);
+}
+
+
+int
+draw_status(Bar *bar, BarDrawArg *a)
+{
+	return drw_text(drw, a->x, 0, a->w, bh, lrpad / 2, stext, 0);
+}
+
+
+int
+click_status(Bar *bar, Arg *arg, BarClickArg *a)
+{
+	return ClkStatusText;
+}
diff --git a/patch/bar_status.h b/patch/bar_status.h
new file mode 100644
index 0000000..b02a4b8
--- /dev/null
+++ b/patch/bar_status.h
@@ -0,0 +1,3 @@
+static int width_status(Bar *bar, BarWidthArg *a);
+static int draw_status(Bar *bar, BarDrawArg *a);
+static int click_status(Bar *bar, Arg *arg, BarClickArg *a);
diff --git a/patch/bar_tags.c b/patch/bar_tags.c
new file mode 100644
index 0000000..680e1fe
--- /dev/null
+++ b/patch/bar_tags.c
@@ -0,0 +1,55 @@
+int
+width_tags(Bar *bar, BarWidthArg *a)
+{
+	int w, i;
+
+	for (w = 0, i = 0; i < LENGTH(tags); i++) {
+		w += TEXTW(tags[i]);
+	}
+	return w;
+}
+
+int
+draw_tags(Bar *bar, BarDrawArg *a)
+{
+	int invert;
+	int w, x = a->x;
+	int boxs = drw->fonts->h / 9;
+	int boxw = drw->fonts->h / 6 + 2;
+	unsigned int i, occ = 0, urg = 0;
+	Client *c;
+	Monitor *m = bar->mon;
+
+	for (c = m->clients; c; c = c->next) {
+		occ |= c->tags;
+		if (c->isurgent)
+			urg |= c->tags;
+	}
+
+	for (i = 0; i < LENGTH(tags); i++) {
+		invert = urg & 1 << i;
+		w = TEXTW(tags[i]);
+		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
+		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], invert);
+		if (occ & 1 << i)
+			drw_rect(drw, x + boxs, boxs, boxw, boxw,
+				m == selmon && selmon->sel && selmon->sel->tags & 1 << i, invert);
+		x += w;
+	}
+
+	return x;
+}
+
+int
+click_tags(Bar *bar, Arg *arg, BarClickArg *a)
+{
+	int i = 0, x = lrpad / 2;
+
+	do {
+		x += TEXTW(tags[i]);
+	} while (a->rel_x >= x && ++i < LENGTH(tags));
+	if (i < LENGTH(tags)) {
+		arg->ui = 1 << i;
+	}
+	return ClkTagBar;
+}
diff --git a/patch/bar_tags.h b/patch/bar_tags.h
new file mode 100644
index 0000000..7ac04d8
--- /dev/null
+++ b/patch/bar_tags.h
@@ -0,0 +1,3 @@
+static int width_tags(Bar *bar, BarWidthArg *a);
+static int draw_tags(Bar *bar, BarDrawArg *a);
+static int click_tags(Bar *bar, Arg *arg, BarClickArg *a);
diff --git a/patch/bar_wintitle.c b/patch/bar_wintitle.c
new file mode 100644
index 0000000..3c11b75
--- /dev/null
+++ b/patch/bar_wintitle.c
@@ -0,0 +1,31 @@
+int
+width_wintitle(Bar *bar, BarWidthArg *a)
+{
+	return a->max_width;
+}
+
+int
+draw_wintitle(Bar *bar, BarDrawArg *a)
+{
+	int boxs = drw->fonts->h / 9;
+	int boxw = drw->fonts->h / 6 + 2;
+	int x = a->x, w = a->w;
+	Monitor *m = bar->mon;
+
+	if (m->sel) {
+		drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
+		drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
+		if (m->sel->isfloating)
+			drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
+	} else {
+		drw_setscheme(drw, scheme[SchemeNorm]);
+		drw_rect(drw, x, 0, w, bh, 1, 1);
+	}
+	return x + w;
+}
+
+int
+click_wintitle(Bar *bar, Arg *arg, BarClickArg *a)
+{
+	return ClkWinTitle;
+}
diff --git a/patch/bar_wintitle.h b/patch/bar_wintitle.h
new file mode 100644
index 0000000..266404c
--- /dev/null
+++ b/patch/bar_wintitle.h
@@ -0,0 +1,3 @@
+static int width_wintitle(Bar *bar, BarWidthArg *a);
+static int draw_wintitle(Bar *bar, BarDrawArg *a);
+static int click_wintitle(Bar *bar, Arg *arg, BarClickArg *a);
diff --git a/patch/include.c b/patch/include.c
new file mode 100644
index 0000000..d422f56
--- /dev/null
+++ b/patch/include.c
@@ -0,0 +1,5 @@
+/* Bar functionality */
+#include "bar_ltsymbol.c"
+#include "bar_status.c"
+#include "bar_tags.c"
+#include "bar_wintitle.c"
\ No newline at end of file
diff --git a/patch/include.h b/patch/include.h
new file mode 100644
index 0000000..5f9a3fe
--- /dev/null
+++ b/patch/include.h
@@ -0,0 +1,5 @@
+/* Bar functionality */
+#include "bar_ltsymbol.h"
+#include "bar_status.h"
+#include "bar_tags.h"
+#include "bar_wintitle.h"
\ No newline at end of file
-- 
2.19.1


From a44a11168d6823a5b725242dfb5480b5be2f4b91 Mon Sep 17 00:00:00 2001
From: Bakkeby <bakkeby@gmail.com>
Date: Mon, 10 Jan 2022 14:11:51 +0100
Subject: [PATCH 2/2] Adding systray module

---
 config.def.h        |   3 +
 dwm.c               | 131 ++++++++++++++++++++++++++----
 patch/bar_systray.c | 190 ++++++++++++++++++++++++++++++++++++++++++++
 patch/bar_systray.h |  40 ++++++++++
 patch/include.c     |   3 +-
 patch/include.h     |   3 +-
 6 files changed, 353 insertions(+), 17 deletions(-)
 create mode 100644 patch/bar_systray.c
 create mode 100644 patch/bar_systray.h

diff --git a/config.def.h b/config.def.h
index f870c41..a22f507 100644
--- a/config.def.h
+++ b/config.def.h
@@ -5,6 +5,8 @@ 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 unsigned int systrayspacing = 2;   /* systray spacing */
+static const int showsystray             = 1;   /* 0 means no systray */
 static const char *fonts[]          = { "monospace:size=10" };
 static const char dmenufont[]       = "monospace:size=10";
 static const char col_gray1[]       = "#222222";
@@ -47,6 +49,7 @@ static const BarRule barrules[] = {
 	/* monitor  bar    alignment         widthfunc              drawfunc              clickfunc           name */
 	{ -1,       0,     BAR_ALIGN_LEFT,   width_tags,            draw_tags,            click_tags,         "tags" },
 	{ -1,       0,     BAR_ALIGN_LEFT,   width_ltsymbol,        draw_ltsymbol,        click_ltsymbol,     "layout" },
+	{ 'A',      0,     BAR_ALIGN_RIGHT,  width_systray,         draw_systray,         click_systray,      "systray" },
 	{ 'A',      0,     BAR_ALIGN_RIGHT,  width_status,          draw_status,          click_status,       "status" },
 	{ -1,       0,     BAR_ALIGN_NONE,   width_wintitle,        draw_wintitle,        click_wintitle,     "wintitle" },
 };
diff --git a/dwm.c b/dwm.c
index 86763d8..6875b06 100644
--- a/dwm.c
+++ b/dwm.c
@@ -63,6 +63,8 @@ enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
 enum { SchemeNorm, SchemeSel }; /* color schemes */
 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
+       NetSystemTray, NetSystemTrayOP, NetSystemTrayOrientation,
+       NetSystemTrayVisual, NetWMWindowTypeDock, NetSystemTrayOrientationHorz,
        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
@@ -247,7 +249,7 @@ static void resizemouse(const Arg *arg);
 static void restack(Monitor *m);
 static void run(void);
 static void scan(void);
-static int sendevent(Client *c, Atom proto);
+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 setfocus(Client *c);
@@ -311,9 +313,10 @@ static void (*handler[LASTEvent]) (XEvent *) = {
 	[MapRequest] = maprequest,
 	[MotionNotify] = motionnotify,
 	[PropertyNotify] = propertynotify,
+	[ResizeRequest] = resizerequest,
 	[UnmapNotify] = unmapnotify
 };
-static Atom wmatom[WMLast], netatom[NetLast];
+static Atom wmatom[WMLast], netatom[NetLast], xatom[XLast];
 static int running = 1;
 static Cur *cursor[CurLast];
 static Clr **scheme;
@@ -556,6 +559,15 @@ cleanup(void)
 	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 	while (mons)
 		cleanupmon(mons);
+	if (showsystray && systray) {
+		while (systray->icons)
+			removesystrayicon(systray->icons);
+		if (systray->win) {
+			XUnmapWindow(dpy, systray->win);
+			XDestroyWindow(dpy, systray->win);
+		}
+		free(systray);
+	}
 	for (i = 0; i < CurLast; i++)
 		drw_cur_free(drw, cursor[i]);
 	for (i = 0; i < LENGTH(colors); i++)
@@ -591,9 +603,48 @@ cleanupmon(Monitor *mon)
 void
 clientmessage(XEvent *e)
 {
+	XWindowAttributes wa;
+	XSetWindowAttributes swa;
 	XClientMessageEvent *cme = &e->xclient;
 	Client *c = wintoclient(cme->window);
 
+	if (showsystray && systray && cme->window == systray->win && cme->message_type == netatom[NetSystemTrayOP]) {
+		/* add systray icons */
+		if (cme->data.l[1] == SYSTEM_TRAY_REQUEST_DOCK) {
+			if (!(c = (Client *)calloc(1, sizeof(Client))))
+				die("fatal: could not malloc() %u bytes\n", sizeof(Client));
+			if (!(c->win = cme->data.l[2])) {
+				free(c);
+				return;
+			}
+
+			c->mon = selmon;
+			c->next = systray->icons;
+			systray->icons = c;
+			XGetWindowAttributes(dpy, c->win, &wa);
+			c->x = c->oldx = c->y = c->oldy = 0;
+			c->w = c->oldw = wa.width;
+			c->h = c->oldh = wa.height;
+			c->oldbw = wa.border_width;
+			c->bw = 0;
+			c->isfloating = True;
+			/* reuse tags field as mapped status */
+			c->tags = 1;
+			updatesizehints(c);
+			updatesystrayicongeom(c, wa.width, wa.height);
+			XAddToSaveSet(dpy, c->win);
+			XSelectInput(dpy, c->win, StructureNotifyMask | PropertyChangeMask | ResizeRedirectMask);
+			XReparentWindow(dpy, c->win, systray->win, 0, 0);
+			/* use parents background color */
+			swa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
+			XChangeWindowAttributes(dpy, c->win, CWBackPixel, &swa);
+			sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_EMBEDDED_NOTIFY, 0 , systray->win, XEMBED_EMBEDDED_VERSION);
+			XSync(dpy, False);
+			setclientstate(c, NormalState);
+		}
+		return;
+	}
+
 	if (!c)
 		return;
 	if (cme->message_type == netatom[NetWMState]) {
@@ -756,6 +807,10 @@ destroynotify(XEvent *e)
 
 	if ((c = wintoclient(ev->window)))
 		unmanage(c, 1);
+	else if (showsystray && (c = wintosystrayicon(ev->window))) {
+		removesystrayicon(c);
+		drawbarwin(systray->bar);
+	}
 }
 
 void
@@ -1022,9 +1077,15 @@ getatomprop(Client *c, Atom prop)
 	unsigned char *p = NULL;
 	Atom da, atom = None;
 
-	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
+	Atom req = XA_ATOM;
+	if (prop == xatom[XembedInfo])
+		req = xatom[XembedInfo];
+
+	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, req,
 		&da, &di, &dl, &dl, &p) == Success && p) {
 		atom = *(Atom *)p;
+		if (da == xatom[XembedInfo] && dl == 2)
+			atom = ((Atom *)p)[1];
 		XFree(p);
 	}
 	return atom;
@@ -1162,7 +1223,7 @@ killclient(const Arg *arg)
 {
 	if (!selmon->sel)
 		return;
-	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
+	if (!sendevent(selmon->sel->win, wmatom[WMDelete], NoEventMask, wmatom[WMDelete], CurrentTime, 0, 0, 0)) {
 		XGrabServer(dpy);
 		XSetErrorHandler(xerrordummy);
 		XSetCloseDownMode(dpy, DestroyAll);
@@ -1248,9 +1309,15 @@ mappingnotify(XEvent *e)
 void
 maprequest(XEvent *e)
 {
+	Client *i;
 	static XWindowAttributes wa;
 	XMapRequestEvent *ev = &e->xmaprequest;
 
+	if (showsystray && systray && (i = wintosystrayicon(ev->window))) {
+		sendevent(i->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_WINDOW_ACTIVATE, 0, systray->win, XEMBED_EMBEDDED_VERSION);
+		drawbarwin(systray->bar);
+	}
+
 	if (!XGetWindowAttributes(dpy, ev->window, &wa))
 		return;
 	if (wa.override_redirect)
@@ -1374,6 +1441,16 @@ propertynotify(XEvent *e)
 	Window trans;
 	XPropertyEvent *ev = &e->xproperty;
 
+	if (showsystray && (c = wintosystrayicon(ev->window))) {
+		if (ev->atom == XA_WM_NORMAL_HINTS) {
+			updatesizehints(c);
+			updatesystrayicongeom(c, c->w, c->h);
+		}
+		else
+			updatesystrayiconstate(c, ev);
+		drawbarwin(systray->bar);
+	}
+
 	if ((ev->window == root) && (ev->atom == XA_WM_NAME))
 		updatestatus();
 	else if (ev->state == PropertyDelete)
@@ -1593,26 +1670,36 @@ setclientstate(Client *c, long state)
 }
 
 int
-sendevent(Client *c, Atom proto)
+sendevent(Window w, Atom proto, int mask, long d0, long d1, long d2, long d3, long d4)
 {
 	int n;
 	Atom *protocols;
+	Atom mt;
 	int exists = 0;
 	XEvent ev;
 
-	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
-		while (!exists && n--)
-			exists = protocols[n] == proto;
-		XFree(protocols);
+	if (proto == wmatom[WMTakeFocus] || proto == wmatom[WMDelete]) {
+		mt = wmatom[WMProtocols];
+		if (XGetWMProtocols(dpy, w, &protocols, &n)) {
+			while (!exists && n--)
+				exists = protocols[n] == proto;
+			XFree(protocols);
+		}
+	} else {
+		exists = True;
+		mt = proto;
 	}
 	if (exists) {
 		ev.type = ClientMessage;
-		ev.xclient.window = c->win;
-		ev.xclient.message_type = wmatom[WMProtocols];
+		ev.xclient.window = w;
+		ev.xclient.message_type = mt;
 		ev.xclient.format = 32;
-		ev.xclient.data.l[0] = proto;
-		ev.xclient.data.l[1] = CurrentTime;
-		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
+		ev.xclient.data.l[0] = d0;
+		ev.xclient.data.l[1] = d1;
+		ev.xclient.data.l[2] = d2;
+		ev.xclient.data.l[3] = d3;
+		ev.xclient.data.l[4] = d4;
+		XSendEvent(dpy, w, False, mask, &ev);
 	}
 	return exists;
 }
@@ -1626,7 +1713,7 @@ setfocus(Client *c)
 			XA_WINDOW, 32, PropModeReplace,
 			(unsigned char *) &(c->win), 1);
 	}
-	sendevent(c, wmatom[WMTakeFocus]);
+	sendevent(c->win, wmatom[WMTakeFocus], NoEventMask, wmatom[WMTakeFocus], CurrentTime, 0, 0, 0);
 }
 
 void
@@ -1715,6 +1802,15 @@ setup(void)
 	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
 	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
 	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
+	netatom[NetSystemTray] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_S0", False);
+	netatom[NetSystemTrayOP] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_OPCODE", False);
+	netatom[NetSystemTrayOrientation] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_ORIENTATION", False);
+	netatom[NetSystemTrayOrientationHorz] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_ORIENTATION_HORZ", False);
+	netatom[NetSystemTrayVisual] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_VISUAL", False);
+	netatom[NetWMWindowTypeDock] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DOCK", False);
+	xatom[Manager] = XInternAtom(dpy, "MANAGER", False);
+	xatom[Xembed] = XInternAtom(dpy, "_XEMBED", False);
+	xatom[XembedInfo] = XInternAtom(dpy, "_XEMBED_INFO", False);
 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
 	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
@@ -1959,6 +2055,11 @@ unmapnotify(XEvent *e)
 			setclientstate(c, WithdrawnState);
 		else
 			unmanage(c, 0);
+	} else if (showsystray && (c = wintosystrayicon(ev->window))) {
+		/* KLUDGE! sometimes icons occasionally unmap their windows, but do
+		 * _not_ destroy them. We map those windows back */
+		XMapRaised(dpy, c->win);
+		drawbarwin(systray->bar);
 	}
 }
 
diff --git a/patch/bar_systray.c b/patch/bar_systray.c
new file mode 100644
index 0000000..3ae2e56
--- /dev/null
+++ b/patch/bar_systray.c
@@ -0,0 +1,190 @@
+static Systray *systray = NULL;
+static unsigned long systrayorientation = _NET_SYSTEM_TRAY_ORIENTATION_HORZ;
+
+int
+width_systray(Bar *bar, BarWidthArg *a)
+{
+	unsigned int w = 0;
+	Client *i;
+	if (!systray)
+		return 1;
+	if (showsystray)
+		for (i = systray->icons; i; w += i->w + systrayspacing, i = i->next);
+	return w ? w + lrpad - systrayspacing : 0;
+}
+
+int
+draw_systray(Bar *bar, BarDrawArg *a)
+{
+	if (!showsystray) {
+		if (systray)
+			XMoveWindow(dpy, systray->win, -500, bar->by);
+		return a->x;
+	}
+
+	XSetWindowAttributes wa;
+	Client *i;
+	unsigned int w;
+
+	if (!systray) {
+		/* init systray */
+		if (!(systray = (Systray *)calloc(1, sizeof(Systray))))
+			die("fatal: could not malloc() %u bytes\n", sizeof(Systray));
+
+		wa.override_redirect = True;
+		wa.event_mask = ButtonPressMask|ExposureMask;
+		wa.border_pixel = 0;
+		#if BAR_ALPHA_PATCH
+		wa.background_pixel = 0;
+		wa.colormap = cmap;
+		systray->win = XCreateWindow(dpy, root, bar->bx + a->x + lrpad / 2, bar->by, MAX(a->w + 40, 1), bar->bh, 0, depth,
+						InputOutput, visual,
+						CWOverrideRedirect|CWBorderPixel|CWBackPixel|CWColormap|CWEventMask, &wa); // CWBackPixmap
+		#else
+		wa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
+		systray->win = XCreateSimpleWindow(dpy, root, bar->bx + a->x + lrpad / 2, bar->by, MIN(a->w, 1), bar->bh, 0, 0, scheme[SchemeNorm][ColBg].pixel);
+		XChangeWindowAttributes(dpy, systray->win, CWOverrideRedirect|CWBackPixel|CWBorderPixel|CWEventMask, &wa);
+		#endif // BAR_ALPHA_PATCH
+
+		XSelectInput(dpy, systray->win, SubstructureNotifyMask);
+		XChangeProperty(dpy, systray->win, netatom[NetSystemTrayOrientation], XA_CARDINAL, 32,
+				PropModeReplace, (unsigned char *)&systrayorientation, 1);
+		#if BAR_ALPHA_PATCH
+		XChangeProperty(dpy, systray->win, netatom[NetSystemTrayVisual], XA_VISUALID, 32,
+				PropModeReplace, (unsigned char *)&visual->visualid, 1);
+		#endif // BAR_ALPHA_PATCH
+		XChangeProperty(dpy, systray->win, netatom[NetWMWindowType], XA_ATOM, 32,
+				PropModeReplace, (unsigned char *)&netatom[NetWMWindowTypeDock], 1);
+		XMapRaised(dpy, systray->win);
+		XSetSelectionOwner(dpy, netatom[NetSystemTray], systray->win, CurrentTime);
+		if (XGetSelectionOwner(dpy, netatom[NetSystemTray]) == systray->win) {
+			sendevent(root, xatom[Manager], StructureNotifyMask, CurrentTime, netatom[NetSystemTray], systray->win, 0, 0);
+			XSync(dpy, False);
+		} else {
+			fprintf(stderr, "dwm: unable to obtain system tray.\n");
+			free(systray);
+			systray = NULL;
+			return a->x;
+		}
+	}
+
+	systray->bar = bar;
+
+	drw_setscheme(drw, scheme[SchemeNorm]);
+	for (w = 0, i = systray->icons; i; i = i->next) {
+		#if BAR_ALPHA_PATCH
+		wa.background_pixel = 0;
+		#else
+		wa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
+		#endif // BAR_ALPHA_PATCH
+		XChangeWindowAttributes(dpy, i->win, CWBackPixel, &wa);
+		XMapRaised(dpy, i->win);
+		i->x = w;
+		XMoveResizeWindow(dpy, i->win, i->x, 0, i->w, i->h);
+		w += i->w;
+		if (i->next)
+			w += systrayspacing;
+		if (i->mon != bar->mon)
+			i->mon = bar->mon;
+	}
+
+	XMoveResizeWindow(dpy, systray->win, bar->bx + a->x + lrpad / 2, (w ? bar->by : -bar->by), MAX(w, 1), bar->bh);
+	return a->x + a->w;
+}
+
+int
+click_systray(Bar *bar, Arg *arg, BarClickArg *a)
+{
+	return -1;
+}
+
+void
+removesystrayicon(Client *i)
+{
+	Client **ii;
+
+	if (!showsystray || !i)
+		return;
+	for (ii = &systray->icons; *ii && *ii != i; ii = &(*ii)->next);
+	if (ii)
+		*ii = i->next;
+	free(i);
+	drawbarwin(systray->bar);
+}
+
+void
+resizerequest(XEvent *e)
+{
+	XResizeRequestEvent *ev = &e->xresizerequest;
+	Client *i;
+
+	if ((i = wintosystrayicon(ev->window))) {
+		updatesystrayicongeom(i, ev->width, ev->height);
+		drawbarwin(systray->bar);
+	}
+}
+
+void
+updatesystrayicongeom(Client *i, int w, int h)
+{
+	if (i) {
+		i->h = bh;
+		if (w == h)
+			i->w = bh;
+		else if (h == bh)
+			i->w = w;
+		else
+			i->w = (int) ((float)bh * ((float)w / (float)h));
+		applysizehints(i, &(i->x), &(i->y), &(i->w), &(i->h), False);
+		/* force icons into the systray dimensions if they don't want to */
+		if (i->h > bh) {
+			if (i->w == i->h)
+				i->w = bh;
+			else
+				i->w = (int) ((float)bh * ((float)i->w / (float)i->h));
+			i->h = bh;
+		}
+		if (i->w > 2*bh)
+			i->w = bh;
+	}
+}
+
+void
+updatesystrayiconstate(Client *i, XPropertyEvent *ev)
+{
+	long flags;
+	int code = 0;
+
+	if (!showsystray || !systray || !i || ev->atom != xatom[XembedInfo] ||
+			!(flags = getatomprop(i, xatom[XembedInfo])))
+		return;
+
+	if (flags & XEMBED_MAPPED && !i->tags) {
+		i->tags = 1;
+		code = XEMBED_WINDOW_ACTIVATE;
+		XMapRaised(dpy, i->win);
+		setclientstate(i, NormalState);
+	}
+	else if (!(flags & XEMBED_MAPPED) && i->tags) {
+		i->tags = 0;
+		code = XEMBED_WINDOW_DEACTIVATE;
+		XUnmapWindow(dpy, i->win);
+		setclientstate(i, WithdrawnState);
+	}
+	else
+		return;
+	sendevent(i->win, xatom[Xembed], StructureNotifyMask, CurrentTime, code, 0,
+			systray->win, XEMBED_EMBEDDED_VERSION);
+}
+
+Client *
+wintosystrayicon(Window w)
+{
+	if (!systray)
+		return NULL;
+	Client *i = NULL;
+	if (!showsystray || !w)
+		return i;
+	for (i = systray->icons; i && i->win != w; i = i->next);
+	return i;
+}
diff --git a/patch/bar_systray.h b/patch/bar_systray.h
new file mode 100644
index 0000000..5123a73
--- /dev/null
+++ b/patch/bar_systray.h
@@ -0,0 +1,40 @@
+#define SYSTEM_TRAY_REQUEST_DOCK    0
+#define _NET_SYSTEM_TRAY_ORIENTATION_HORZ 0
+
+/* XEMBED messages */
+#define XEMBED_EMBEDDED_NOTIFY      0
+#define XEMBED_WINDOW_ACTIVATE      1
+#define XEMBED_FOCUS_IN             4
+#define XEMBED_MODALITY_ON         10
+
+#define XEMBED_MAPPED              (1 << 0)
+#define XEMBED_WINDOW_ACTIVATE      1
+#define XEMBED_WINDOW_DEACTIVATE    2
+
+#define VERSION_MAJOR               0
+#define VERSION_MINOR               0
+#define XEMBED_EMBEDDED_VERSION (VERSION_MAJOR << 16) | VERSION_MINOR
+
+/* enums */
+enum { Manager, Xembed, XembedInfo, XLast }; /* Xembed atoms */
+
+typedef struct Systray Systray;
+struct Systray {
+	Window win;
+	Client *icons;
+	Bar *bar;
+};
+
+/* bar integration */
+static int width_systray(Bar *bar, BarWidthArg *a);
+static int draw_systray(Bar *bar, BarDrawArg *a);
+static int click_systray(Bar *bar, Arg *arg, BarClickArg *a);
+
+/* function declarations */
+static Atom getatomprop(Client *c, Atom prop);
+static void removesystrayicon(Client *i);
+static void resizerequest(XEvent *e);
+static void updatesystrayicongeom(Client *i, int w, int h);
+static void updatesystrayiconstate(Client *i, XPropertyEvent *ev);
+static Client *wintosystrayicon(Window w);
+
diff --git a/patch/include.c b/patch/include.c
index d422f56..c82b392 100644
--- a/patch/include.c
+++ b/patch/include.c
@@ -2,4 +2,5 @@
 #include "bar_ltsymbol.c"
 #include "bar_status.c"
 #include "bar_tags.c"
-#include "bar_wintitle.c"
\ No newline at end of file
+#include "bar_wintitle.c"
+#include "bar_systray.c"
\ No newline at end of file
diff --git a/patch/include.h b/patch/include.h
index 5f9a3fe..c01916a 100644
--- a/patch/include.h
+++ b/patch/include.h
@@ -2,4 +2,5 @@
 #include "bar_ltsymbol.h"
 #include "bar_status.h"
 #include "bar_tags.h"
-#include "bar_wintitle.h"
\ No newline at end of file
+#include "bar_wintitle.h"
+#include "bar_systray.h"
\ No newline at end of file
-- 
2.19.1