.TH DWM 1 dwm-VERSION
.SH NAME
dwm \- dynamic window manager
.SH SYNOPSIS
.B dwm
.RB [ \-v ]
.SH DESCRIPTION
.B dwm
is a dynamic window manager for X11. It manages windows in tiling and floating
modes. Either mode can be applied dynamically, optimizing the environment for
the application in use and the task performed.
.P
In tiling mode windows are managed in a master and stacking column. The master
column contains the window which currently needs most attention, whereas the
stacking column contains all other windows. In floating mode windows can be
resized and moved freely. Dialog windows are always managed floating,
regardless of the mode selected.
.P
Windows are grouped by tags. Each window can be tagged with one or multiple
tags. Selecting a certain tag for viewing will display all windows with that
tag.
.P
.B dwm
has a small status bar which displays the text read from standard
input, if written. Besides that, it displays all available tags, and the title
of the focused window. It draws a 1-pixel border around windows to
indicate the focus state. Unfocused windows contain a small bar in front of
them displaying their tags and title.
.SH OPTIONS
.TP
.B \-v
prints version information to standard output, then exits.
.SH USAGE
.TP
.B Mod1-Return
Zoom
.B window
to the 
.B master
column.
.TP
.B Mod1-h
Focus previous
.B tag.
.TP
.B Mod1-j
Focus next
.B window.
.TP
.B Mod1-k
Focus previous
.B window.
.TP
.B Mod1-l
Focus next
.B tag.
.TP
.B Mod1-m
Maximize current
.B window.
.TP
.B Mod1-[0..n]
Focus
.B nth tag.
.TP
.B Mod1-space
Toggle between
.B tiled
and
.B floating
mode (affects
.BR "all windows" ).
.TP
.B Mod1-Shift-[0..n]
Apply
.<
/*
 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */
#include "dwm.h"

#include <stdlib.h>
#include <X11/keysym.h>
#include <X11/Xatom.h>

#define ButtonMask      (ButtonPressMask | ButtonReleaseMask)
#define MouseMask       (ButtonMask | PointerMotionMask)

/* CUSTOMIZE */
const char *browse[] = { "firefox", NULL };
const char *gimp[] = { "gimp", NULL };
const char *term[] = { 
	"urxvtc", "-tr", "+sb", "-bg", "black", "-fg", "white", "-cr", "white",
	"-fn", "-*-terminus-medium-*-*-*-13-*-*-*-*-*-iso10646-*", NULL
};
const char *xlock[] = { "xlock", NULL };

Key key[] = {
	/* modifier				key			function	arguments */
	{ ControlMask,			XK_0,		appendtag,	{ .i = Tscratch } }, 
	{ ControlMask,			XK_1,		appendtag,	{ .i = Tdev } }, 
	{ ControlMask,			XK_2,		appendtag,	{ .i = Twww } }, 
	{ ControlMask,			XK_3,		appendtag,	{ .i = Twork } }, 
	{ Mod1Mask,				XK_0,		view,		{ .i = Tscratch } }, 
	{ Mod1Mask,				XK_1,		view,		{ .i = Tdev } }, 
	{ Mod1Mask,				XK_2,		view,		{ .i = Twww } }, 
	{ Mod1Mask,				XK_3,		view,		{ .i = Twork } }, 
	{ Mod1Mask,				XK_j,		focusnext,		{ 0 } }, 
	{ Mod1Mask,				XK_k,		focusprev,		{ 0 } },
	{ Mod1Mask,				XK_m,		maximize,		{ 0 } }, 
	{ Mod1Mask,				XK_space,	dotile,		{ 0 } }, 
	{ Mod1Mask,				XK_Return,	zoom,		{ 0 } },
	{ ControlMask|ShiftMask,XK_0,		heretag,	{ .i = Tscratch } }, 
	{ ControlMask|ShiftMask,XK_1,		heretag,	{ .i = Tdev } }, 
	{ ControlMask|ShiftMask,XK_2,		heretag,	{ .i = Twww } }, 
	{ ControlMask|ShiftMask,XK_3,		heretag,	{ .i = Twork } }, 
	{ Mod1Mask|ShiftMask,	XK_0,		replacetag,		{ .i = Tscratch } }, 
	{ Mod1Mask|ShiftMask,	XK_1,		replacetag,		{ .i = Tdev } }, 
	{ Mod1Mask|ShiftMask,	XK_2,		replacetag,		{ .i = Twww } }, 
	{ Mod1Mask|ShiftMask,	XK_3,		replacetag,		{ .i = Twork } }, 
	{ Mod1Mask|ShiftMask,	XK_c,		killclient,		{ 0 } }, 
	{ Mod1Mask|ShiftMask,	XK_g,		spawn,		{ .argv = gimp } },
	{ Mod1Mask|ShiftMask,	XK_l,		spawn,		{ .argv = xlock } },
	{ Mod1Mask|ShiftMask,	XK_q,		quit,		{ 0 } },
	{ Mod1Mask|ShiftMask,	XK_space,	dofloat,	{ 0 } }, 
	{ Mod1Mask|ShiftMask,	XK_w,		spawn,		{ .argv = browse } },
	{ Mod1Mask|ShiftMask,	XK_Return,	spawn,		{ .argv = term } },
};

/* static */

static void
movemouse(Client *c)
{
	XEvent ev;
	int x1, y1, ocx, ocy, di;
	unsigned int dui;
	Window dummy;

	ocx = *c->x;
	ocy = *c->y;
	if(XGrabPointer(dpy, root, False, MouseMask, GrabModeAsync, GrabModeAsync,
				None, cursor[CurMove], CurrentTime) != GrabSuccess)
		return;
	XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
	for(;;) {
		XMaskEvent(dpy, MouseMask | ExposureMask, &ev);
		switch (ev.type) {
		default: break;
		case Expose:
			handler[Expose](&ev);
			break;
		case MotionNotify:
			XSync(dpy, False);
			*c->x = ocx + (ev.xmotion.x - x1);
			*c->y = ocy + (ev.xmotion.y - y1);
			resize(c, False);
			break;
		case ButtonRelease:
			XUngrabPointer(dpy, CurrentTime);
			return;
		}
	}
}

static void
resizemouse(Client *c)
{
	XEvent ev;
	int ocx, ocy;

	ocx = *c->x;
	ocy = *c->y;
	if(XGrabPointer(dpy, root, False, MouseMask, GrabModeAsync, GrabModeAsync,
				None, cursor[CurResize], CurrentTime) != GrabSuccess)
		return;
	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, *c->w, *c->h);
	for(;;) {
		XMaskEvent(dpy, MouseMask | ExposureMask, &ev);
		switch(ev.type) {
		default: break;
		case Expose:
			handler[Expose](&ev);
			break;
		case MotionNotify:
			XSync(dpy, False);
			*c->w = abs(ocx - ev.xmotion.x);
			*c->h = abs(ocy - ev.xmotion.y);
			*c->x = (ocx <= ev.xmotion.x) ? ocx : ocx - *c->w;
			*c->y = (ocy <= ev.xmotion.y) ? ocy : ocy - *c->h;
			resize(c, True);
			break;
		case ButtonRelease:
			XUngrabPointer(dpy, CurrentTime);
			return;
		}
	}
}

static void
buttonpress(XEvent *e)
{
	int x;
	Arg a;
	XButtonPressedEvent *ev = &e->xbutton;
	Client *c;

	if(barwin == ev->window) {
		switch(ev->button) {
		default:
			x = 0;
			for(a.i = 0; a.i < TLast; a.i++) {
				x += textw(tags[a.i]);
				if(ev->x < x) {
					view(&a);
					break;
				}
			}
			break;
		case Button4:
			a.i = (tsel + 1 < TLast) ? tsel + 1 : 0;
			view(&a);
			break;
		case Button5:
			a.i = (tsel - 1 >= 0) ? tsel - 1 : TLast - 1;
			view(&a);
			break;
		}
	}
	else if((c = getclient(ev->window))) {
		if(arrange == dotile && !c->isfloat) {
			if((ev->state & ControlMask) && (ev->button == Button1))
				zoom(NULL);
			return;
		}
		/* floating windows */
		higher(c);
		switch(ev->button) {
		default:
			break;
		case Button1:
			movemouse(c);
			break;
		case Button2:
			lower(c);
			break;
		case Button3:
			resizemouse(c);
			break;
		}
	}
}

static void
configurerequest(XEvent *e)
{
	XConfigureRequestEvent *ev = &e->xconfigurerequest;
	XWindowChanges wc;
	Client *c;

	ev->value_mask &= ~CWSibling;
	if((c = getclient(ev->window))) {
		gravitate(c, True);
		if(ev->value_mask & CWX)
			*c->x = ev->x;
		if(ev->value_mask & CWY)
			*c->y = ev->y;
		if(ev->value_mask & CWWidth)
			*c->w = ev->width;
		if(ev->value_mask & CWHeight)
			*c->h = ev->height;
		if(ev->value_mask & CWBorderWidth)
			c->border = 1;
		gravitate(c, False);
		resize(c, True);
	}

	wc.x = ev->x;
	wc.y = ev->y;
	wc.width = ev->width;
	wc.height = ev->height;
	wc.border_width = 1;
	wc.sibling = None;
	wc.stack_mode = Above;
	ev->value_mask &= ~CWStackMode;
	ev->value_mask |= CWBorderWidth;
	XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
	XSync(dpy, False);
}

static void
destroynotify(XEvent *e)
{
	Client *c;
	XDestroyWindowEvent *ev = &e->xdestroywindow;

	if((c = getclient(ev->window)))
		unmanage(c);
}

static void
enternotify(XEvent *e)
{
	XCrossingEvent *ev = &e->xcrossing;
	Client *c;

	if(ev->mode != NotifyNormal || ev->detail == NotifyInferior)
		return;

	if((c = getclient(ev->window)))
		focus(c);
	else if(ev->window == root)
		issel = True;
}

static void
expose(XEvent *e)
{
	XExposeEvent *ev = &e->xexpose;
	Client *c;

	if(ev->count == 0) {
		if(barwin == ev->window)
			drawstatus();
		else if((c = getctitle(ev->window)))
			drawtitle(c);
	}
}

static void
keypress(XEvent *e)
{
	XKeyEvent *ev = &e->xkey;
	static unsigned int len = key ? sizeof(key) / sizeof(key[0]) : 0;
	unsigned int i;
	KeySym keysym;

	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
	for(i = 0; i < len; i++)
		if((keysym == key[i].keysym) && (key[i].mod == ev->state)) {
			if(key[i].func)
				key[i].func(&key[i].arg);
			return;
		}
}

static void
leavenotify(XEvent *e)
{
	XCrossingEvent *ev = &e->xcrossing;

	if((ev->window == root) && !ev->same_screen)
		issel = True;
}

static void
maprequest(XEvent *e)
{
	XMapRequestEvent *ev = &e->xmaprequest;
	static XWindowAttributes wa;

	if(!XGetWindowAttributes(dpy, ev->window, &wa))
		return;

	if(wa.override_redirect) {
		XSelectInput(dpy, ev->window,
				(StructureNotifyMask | PropertyChangeMask));
		return;
	}

	if(!getclient(ev->window))
		manage(ev->window, &wa);
}

static void
propertynotify(XEvent *e)
{
	XPropertyEvent *ev = &e->xproperty;
	Window trans;
	Client *c;

	if(ev->state == PropertyDelete)
		return; /* ignore */

	if((c = getclient(ev->window))) {
		if(ev->atom == wmatom[WMProtocols]) {
			c->proto = getproto(c->win);
			return;
		}
		switch (ev->atom) {
			default: break;
			case XA_WM_TRANSIENT_FOR:
				XGetTransientForHint(dpy, c->win, &trans);
				if(!c->isfloat && (c->isfloat = (trans != 0)))
					arrange(NULL);
				break;
			case XA_WM_NORMAL_HINTS:
				setsize(c);
				break;
		}
		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
			settitle(c);
			drawtitle(c);
		}
	}
}

static void
unmapnotify(XEvent *e)
{
	Client *c;
	XUnmapEvent *ev = &e->xunmap;

	if((c = getclient(ev->window)))
		unmanage(c);
}

/* extern */

void (*handler[LASTEvent]) (XEvent *) = {
	[ButtonPress] = buttonpress,
	[ConfigureRequest] = configurerequest,
	[DestroyNotify] = destroynotify,
	[EnterNotify] = enternotify,
	[LeaveNotify] = leavenotify,
	[Expose] = expose,
	[KeyPress] = keypress,
	[MapRequest] = maprequest,
	[PropertyNotify] = propertynotify,
	[UnmapNotify] = unmapnotify
};

void
grabkeys()
{
	static unsigned int len = key ? sizeof(key) / sizeof(key[0]) : 0;
	unsigned int i;
	KeyCode code;

	for(i = 0; i < len; i++) {
		code = XKeysymToKeycode(dpy, key[i].keysym);
		XUngrabKey(dpy, code, key[i].mod, root);
		XGrabKey(dpy, code, key[i].mod, root, True,
				GrabModeAsync, GrabModeAsync);
	}
}