dwm-custom/dwm.c

/* See LICENSE file for copyright and license details.
 *
 * dynamic window manager is designed like any other X client as well. It is
 * driven through handling X events. In contrast to other X clients, a window
 * manager selects for SubstructureRedirectMask on the root window, to receive
 * events about window (dis-)appearance. Only one X connection at a time is
 * allowed to select for this event mask.
 *
 * The event handlers of dwm are organized in an array which is accessed
 * whenever a new event has been fetched. This allows event dispatching
 * in O(1) time.
 *
 * Each child of the root window is called a client, except windows which have
 * set the override_redirect flag. Clients are organized in a linked client
 * list on each monitor, the focus history is remembered through a stack list
 * on each monitor. Each client contains a bit array to indicate the tags of a
 * client.
 *
 * Keys and tagging rules are organized as arrays and defined in config.h.
 *
 * To understand everything else, start reading main().
 */
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xproto.h>
#include <X11/Xresource.h>
#include <X11/Xutil.h>
#include <X11/cursorfont.h>
#include <X11/keysym.h>
#include <errno.h>
#include <locale.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#ifdef XINERAMA
#include <X11/extensions/Xinerama.h>
#endif /* XINERAMA */
#include <X11/Xft/Xft.h>
#include <X11/Xlib-xcb.h>
#include <xcb/res.h>
#ifdef __OpenBSD__
#include <kvm.h>
#include <sys/sysctl.h>
#endif /* __OpenBSD */

#include "drw.h"
#include "util.h"

/* macros */
#define BUTTONMASK (ButtonPressMask | ButtonReleaseMask)
#define CLEANMASK(mask)                                                                            \
    (mask & ~(numlockmask | LockMask) &                                                            \
     (ShiftMask | ControlMask | Mod1Mask | Mod2Mask | Mod3Mask | Mod4Mask | Mod5Mask))
#define GETINC(X) ((X)-2000)
#define INC(X) ((X) + 2000)
#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 ISINC(X) ((X) > 1000 && (X) < 3000)
#define ISVISIBLEONTAG(C, T) ((C->tags & T))
#define ISVISIBLE(C) ISVISIBLEONTAG(C, C->mon->tagset[C->mon->seltags])
#define PREVSEL 3000
#define LENGTH(X) (sizeof X / sizeof X[0])
#define MOD(N, M) ((N) % (M) < 0 ? (N) % (M) + (M) : (N) % (M))
#define MOUSEMASK (BUTTONMASK | PointerMotionMask)
#define WIDTH(X) ((X)->w + 2 * (X)->bw)
#define HEIGHT(X) ((X)->h + 2 * (X)->bw)
#define TAGMASK ((1 << LENGTH(tags)) - 1)
#define TEXTW(X) (drw_fontset_getwidth(drw, (X)) + lrpad)
#define TRUNC(X, A, B) (MAX((A), MIN((X), (B))))

#define SYSTEM_TRAY_REQUEST_DOCK 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 { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
enum {
    SchemeNorm,
    SchemeSel,
    SchemeStatus,
    SchemeTagsSel,
    SchemeTagsNorm,
    SchemeInfoSel,
    SchemeInfoNorm
}; /* color schemes */
enum {
    NetSupported,
    NetWMName,
    NetWMState,
    NetWMCheck,
    NetSystemTray,
    NetSystemTrayOP,
    NetSystemTrayOrientation,
    NetSystemTrayOrientationHorz,
    NetWMFullscreen,
    NetActiveWindow,
    NetWMWindowType,
    NetWMWindowTypeDialog,
    NetClientList,
    NetLast
};                                                            /* EWMH atoms */
enum { Manager, Xembed, XembedInfo, XLast };                  /* Xembed atoms */
enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
enum {
    ClkTagBar,
    ClkLtSymbol,
    ClkStatusText,
    ClkWinTitle,
    ClkClientWin,
    ClkRootWin,
    ClkLast
}; /* clicks */

typedef union {
    int i;
    unsigned int ui;
    float f;
    const void *v;
} Arg;

typedef struct {
    unsigned int click;
    unsigned int mask;
    unsigned int button;
    void (*func)(const Arg *arg);
    const Arg arg;
} Button;

typedef struct Monitor Monitor;
typedef struct Client Client;
struct Client {
    char name[256];
    float mina, maxa;
    int x, y, w, h;
    int oldx, oldy, oldw, oldh;
    int basew, baseh, incw, inch, maxw, maxh, minw, minh, hintsvalid;
    int bw, oldbw;
    unsigned int tags;
    int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen, isterminal, noswallow;
    int floatborderpx, hasfloatbw;
    char scratchkey;
    pid_t pid;
    Client *next;
    Client *snext;
    Client *swallowing;
    Monitor *mon;
    Window win;
};

typedef struct {
    unsigned int mod;
    KeySym keysym;
    void (*func)(const Arg *);
    const Arg arg;
} Key;

typedef struct {
    const char *symbol;
    void (*arrange)(Monitor *);
} Layout;

struct Monitor {
    char ltsymbol[16];
    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;
    const Layout *lt[2];
};

typedef struct {
    const char *class;
    const char *instance;
    const char *title;
    unsigned int tags;
    int isfloating;
    int isterminal;
    int noswallow;
    int monitor;
    const char scratchkey;
    int floatx, floaty, floatw, floath;
    int floatborderpx;
} Rule;

typedef struct Systray Systray;
struct Systray {
    Window win;
    Client *icons;
};

/* Xresources preferences */
enum resource_type { STRING = 0, INTEGER = 1, FLOAT = 2 };

typedef struct {
    char *name;
    enum resource_type type;
    void *dst;
} ResourcePref;

/* function declarations */
static void applyrules(Client *c);
static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
static void arrange(Monitor *m);
static void arrangemon(Monitor *m);
static void attach(Client *c);
static void attachtop(Client *c);
static void attachstack(Client *c);
static void bstack(Monitor *m);
static void bstackhoriz(Monitor *m);
static void buttonpress(XEvent *e);
static void centeredmaster(Monitor *m);
static void centeredfloatingmaster(Monitor *m);
static void checkotherwm(void);
static void cleanup(void);
static void cleanupmon(Monitor *mon);
static void clientmessage(XEvent *e);
static void configure(Client *c);
static void configurenotify(XEvent *e);
static void configurerequest(XEvent *e);
static Monitor *createmon(void);
static void destroynotify(XEvent *e);
static void detach(Client *c);
static void detachstack(Client *c);
static Monitor *dirtomon(int dir);
static void drawbar(Monitor *m);
static void drawbars(void);
static void enternotify(XEvent *e);
static void expose(XEvent *e);
static void focus(Client *c);
static void focusin(XEvent *e);
static void focusmon(const Arg *arg);
static void focusstack(const Arg *arg);
static void gaplessgrid(Monitor *m);
static Atom getatomprop(Client *c, Atom prop);
static int getrootptr(int *x, int *y);
static long getstate(Window w);
static unsigned int getsystraywidth(void);
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 void keypress(XEvent *e);
static void killclient(const Arg *arg);
static void manage(Window w, XWindowAttributes *wa);
static void mappingnotify(XEvent *e);
static void maprequest(XEvent *e);
static void monocle(Monitor *m);
static void motionnotify(XEvent *e);
static void movemouse(const Arg *arg);
static Client *nexttiled(Client *c);
static void pop(Client *c);
static void propertynotify(XEvent *e);
static void pushstack(const Arg *arg);
static void quit(const Arg *arg);
static Monitor *recttomon(int x, int y, int w, int h);
static void removesystrayicon(Client *i);
static void resize(Client *c, int x, int y, int w, int h, int interact);
static void resizebarwin(Monitor *m);
static void resizeclient(Client *c, int x, int y, int w, int h);
static void resizemouse(const Arg *arg);
static void resizerequest(XEvent *e);
static void restack(Monitor *m);
static void run(void);
static void scan(void);
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);
static void setfullscreen(Client *c, int fullscreen);
static void setlayout(const Arg *arg);
static void setmfact(const Arg *arg);
static void setup(void);
static void seturgent(Client *c, int urg);
static void showhide(Client *c);
static void sighup(int unused);
static void sigterm(int unused);
static void spawn(const Arg *arg);
static void spawnscratch(const Arg *arg);
static Monitor *systraytomon(Monitor *m);
static int stackpos(const Arg *arg);
static void tag(const Arg *arg);
static void tagmon(const Arg *arg);
static void tile(Monitor *m);
static void togglebar(const Arg *arg);
static void togglefloating(const Arg *arg);
static void togglefullscr(const Arg *arg);
static void togglescratch(const Arg *arg);
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 unmapnotify(XEvent *e);
static void updatebarpos(Monitor *m);
static void updatebars(void);
static void updateclientlist(void);
static int updategeom(void);
static void updatenumlockmask(void);
static void updatesizehints(Client *c);
static void updatestatus(void);
static void updatesystray(void);
static void updatesystrayicongeom(Client *i, int w, int h);
static void updatesystrayiconstate(Client *i, XPropertyEvent *ev);
static void updatetitle(Client *c);
static void updatewindowtype(Client *c);
static void updatewmhints(Client *c);
static void view(const Arg *arg);
static Client *wintoclient(Window w);
static Monitor *wintomon(Window w);
static Client *wintosystrayicon(Window w);
static int xerror(Display *dpy, XErrorEvent *ee);
static int xerrordummy(Display *dpy, XErrorEvent *ee);
static int xerrorstart(Display *dpy, XErrorEvent *ee);
static void zoom(const Arg *arg);
static void load_xresources(void);
static void resource_load(XrmDatabase db, char *name, enum resource_type rtype, void *dst);

static pid_t getparentprocess(pid_t p);
static int isdescprocess(pid_t p, pid_t c);
static Client *swallowingclient(Window w);
static Client *termforwin(const Client *c);
static pid_t winpid(Window w);

/* variables */
static Systray *systray = NULL;
static const char broken[] = "broken";
static char stext[512];
static int screen;
static int sw, sh; /* X display screen geometry width, height */
static int bh;     /* bar height */
static int lrpad;  /* sum of left and right padding for text */
static int (*xerrorxlib)(Display *, XErrorEvent *);
static unsigned int numlockmask = 0;
static void (*handler[LASTEvent])(XEvent *) = {[ButtonPress] = buttonpress,
                                               [ClientMessage] = clientmessage,
                                               [ConfigureRequest] = configurerequest,
                                               [ConfigureNotify] = configurenotify,
                                               [DestroyNotify] = destroynotify,
                                               [EnterNotify] = enternotify,
                                               [Expose] = expose,
                                               [FocusIn] = focusin,
                                               [KeyPress] = keypress,
                                               [MappingNotify] = mappingnotify,
                                               [MapRequest] = maprequest,
                                               [ResizeRequest] = resizerequest,
                                               [MotionNotify] = motionnotify,
                                               [PropertyNotify] = propertynotify,
                                               [UnmapNotify] = unmapnotify};
static Atom wmatom[WMLast], netatom[NetLast], xatom[XLast];
static int restart = 0;
static int running = 1;
static Cur *cursor[CurLast];
static Clr **scheme;
static Clr *barclrs;
static Display *dpy;
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"

/* compile-time check if all tags fit into an unsigned int bit array. */
struct NumTags {
    char limitexceeded[LENGTH(tags) > 31 ? -1 : 1];
};

/* function implementations */
void applyrules(Client *c) {
    const char *class, *instance;
    unsigned int i;
    const Rule *r;
    Monitor *m;
    XClassHint ch = {NULL, NULL};

    /* rule matching */
    c->isfloating = 0;
    c->tags = 0;
    c->scratchkey = 0;
    XGetClassHint(dpy, c->win, &ch);
    class = ch.res_class ? ch.res_class : broken;
    instance = ch.res_name ? ch.res_name : broken;

    for (i = 0; i < LENGTH(rules); i++) {
        r = &rules[i];
        if ((!r->title || strstr(c->name, r->title)) && (!r->class || strstr(class, r->class)) &&
            (!r->instance || strstr(instance, r->instance))) {
            c->isterminal = r->isterminal;
            c->noswallow = r->noswallow;
            c->isfloating = r->isfloating;
            c->tags |= r->tags;
            if (r->floatborderpx >= 0) {
                c->floatborderpx = r->floatborderpx;
                c->hasfloatbw = 1;
            }
            if (r->isfloating) {
                if (r->floatx > 1)
                    c->x = r->floatx;
                else if (r->floatx > 0)
                    c->x = (int)((float)c->mon->ww * r->floatx - (float)WIDTH(c) / 2);
                else if (r->floatx == 0)
                    ;
                else if (r->floatx > -1)
                    c->x = c->mon->ww + (int)((float)c->mon->ww * r->floatx - (float)WIDTH(c) / 2);
                else
                    c->x = c->mon->ww + r->floatx - WIDTH(c);
                if (c->x + WIDTH(c) > c->mon->wx + c->mon->ww)
                    c->x = c->mon->ww - WIDTH(c);
                c->x = MAX(c->x + c->mon->wx, c->mon->wx);

                if (r->floaty > 1)
                    c->y = r->floaty;
                else if (r->floaty > 0)
                    c->y = (int)((float)c->mon->wh * r->floaty - (float)HEIGHT(c) / 2);
                else if (r->floaty == 0)
                    ;
                else if (r->floaty > -1)
                    c->y = c->mon->wh + (int)((float)c->mon->wh * r->floaty - (float)HEIGHT(c) / 2);
                else
                    c->y = c->mon->wh + r->floaty - HEIGHT(c);
                if (c->y + HEIGHT(c) > c->mon->wy + c->mon->wh)
                    c->y = c->mon->wh - HEIGHT(c);
                c->y = MAX(c->y + c->mon->wy, c->mon->wy);

                if (r->floatw > 1)
                    c->w = r->floatw;
                else if (r->floatw > 0)
                    c->w = (int)((float)c->mon->ww * r->floatw);
                c->w = MIN(c->w, c->mon->ww) - c->bw * 2;

                if (r->floath > 1)
                    c->h = r->floath;
                else if (r->floath > 0)
                    c->h = (int)((float)c->mon->wh * r->floath);
                c->h = MIN(c->h, c->mon->wh) - c->bw * 2;
            }
            c->scratchkey = r->scratchkey;
            for (m = mons; m && m->num != r->monitor; m = m->next)
                ;
            if (m)
                c->mon = m;
        }
    }
    if (ch.res_class)
        XFree(ch.res_class);
    if (ch.res_name)
        XFree(ch.res_name);
    c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
}

int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact) {
    int baseismin;
    Monitor *m = c->mon;

    /* set minimum possible */
    *w = MAX(1, *w);
    *h = MAX(1, *h);
    if (interact) {
        if (*x > sw)
            *x = sw - WIDTH(c);
        if (*y > sh)
            *y = sh - HEIGHT(c);
        if (*x + *w + 2 * c->bw < 0)
            *x = 0;
        if (*y + *h + 2 * c->bw < 0)
            *y = 0;
    } else {
        if (*x >= m->wx + m->ww)
            *x = m->wx + m->ww - WIDTH(c);
        if (*y >= m->wy + m->wh)
            *y = m->wy + m->wh - HEIGHT(c);
        if (*x + *w + 2 * c->bw <= m->wx)
            *x = m->wx;
        if (*y + *h + 2 * c->bw <= m->wy)
            *y = m->wy;
    }
    if (*h < bh)
        *h = bh;
    if (*w < bh)
        *w = bh;
    if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
        if (!c->hintsvalid)
            updatesizehints(c);
        /* see last two sentences in ICCCM 4.1.2.3 */
        baseismin = c->basew == c->minw && c->baseh == c->minh;
        if (!baseismin) { /* temporarily remove base dimensions */
            *w -= c->basew;
            *h -= c->baseh;
        }
        /* adjust for aspect limits */
        if (c->mina > 0 && c->maxa > 0) {
            if (c->maxa < (float)*w / *h)
                *w = *h * c->maxa + 0.5;
            else if (c->mina < (float)*h / *w)
                *h = *w * c->mina + 0.5;
        }
        if (baseismin) { /* increment calculation requires this */
            *w -= c->basew;
            *h -= c->baseh;
        }
        /* adjust for increment value */
        if (c->incw)
            *w -= *w % c->incw;
        if (c->inch)
            *h -= *h % c->inch;
        /* restore base dimensions */
        *w = MAX(*w + c->basew, c->minw);
        *h = MAX(*h + c->baseh, c->minh);
        if (c->maxw)
            *w = MIN(*w, c->maxw);
        if (c->maxh)
            *h = MIN(*h, c->maxh);
    }
    return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
}

void arrange(Monitor *m) {
    if (m)
        showhide(m->stack);
    else
        for (m = mons; m; m = m->next)
            showhide(m->stack);
    if (m) {
        arrangemon(m);
        restack(m);
    } else
        for (m = mons; m; m = m->next)
            arrangemon(m);
}

void arrangemon(Monitor *m) {
    strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
    if (m->lt[m->sellt]->arrange)
        m->lt[m->sellt]->arrange(m);
}

void attach(Client *c) {
    c->next = c->mon->clients;
    c->mon->clients = c;
}

void attachtop(Client *c) {
    int n;
    Monitor *m = selmon;
    Client *below;

    for (n = 1, below = c->mon->clients;
         below && below->next &&
         (below->isfloating || !ISVISIBLEONTAG(below, c->tags) || n != m->nmaster);
         n = below->isfloating || !ISVISIBLEONTAG(below, c->tags) ? n + 0 : n + 1,
        below = below->next)
        ;
    c->next = NULL;
    if (below) {
        c->next = below->next;
        below->next = c;
    } else
        c->mon->clients = c;
}

void attachstack(Client *c) {
    c->snext = c->mon->stack;
    c->mon->stack = c;
}

void swallow(Client *p, Client *c) {

    if (c->noswallow || c->isterminal)
        return;
    if (c->noswallow && !swallowfloating && c->isfloating)
        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);
    XMoveResizeWindow(dpy, p->win, p->x, p->y, p->w, p->h);
    arrange(p->mon);
    configure(p);
    updateclientlist();
}

void unswallow(Client *c) {
    c->win = c->swallowing->win;

    free(c->swallowing);
    c->swallowing = NULL;

    /* unfullscreen the client */
    setfullscreen(c, 0);
    updatetitle(c);
    arrange(c->mon);
    XMapWindow(dpy, c->win);
    XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
    setclientstate(c, NormalState);
    focus(NULL);
    arrange(c->mon);
}

static void bstack(Monitor *m) {
    int w, h, mh, mx, tx, ty, tw;
    unsigned int i, n;
    Client *c;

    for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++)
        ;
    if (n == 0)
        return;
    if (n > m->nmaster) {
        mh = m->nmaster ? m->mfact * m->wh : 0;
        tw = m->ww / (n - m->nmaster);
        ty = m->wy + mh;
    } else {
        mh = m->wh;
        tw = m->ww;
        ty = m->wy;
    }
    for (i = mx = 0, tx = m->wx, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++) {
        if (i < m->nmaster) {
            w = (m->ww - mx) / (MIN(n, m->nmaster) - i);
            resize(c, m->wx + mx, m->wy, w - (2 * c->bw), mh - (2 * c->bw), 0);
            mx += WIDTH(c);
        } else {
            h = m->wh - mh;
            resize(c, tx, ty, tw - (2 * c->bw), h - (2 * c->bw), 0);
            if (tw != m->ww)
                tx += WIDTH(c);
        }
    }
}

static void bstackhoriz(Monitor *m) {
    int w, mh, mx, tx, ty, th;
    unsigned int i, n;
    Client *c;

    for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++)
        ;
    if (n == 0)
        return;
    if (n > m->nmaster) {
        mh = m->nmaster ? m->mfact * m->wh : 0;
        th = (m->wh - mh) / (n - m->nmaster);
        ty = m->wy + mh;
    } else {
        th = mh = m->wh;
        ty = m->wy;
    }
    for (i = mx = 0, tx = m->wx, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++) {
        if (i < m->nmaster) {
            w = (m->ww - mx) / (MIN(n, m->nmaster) - i);
            resize(c, m->wx + mx, m->wy, w - (2 * c->bw), mh - (2 * c->bw), 0);
            mx += WIDTH(c);
        } else {
            resize(c, tx, ty, m->ww - (2 * c->bw), th - (2 * c->bw), 0);
            if (th != m->wh)
                ty += HEIGHT(c);
        }
    }
}

void buttonpress(XEvent *e) {
    unsigned int i, x, click;
    Arg arg = {0};
    Client *c;
    Monitor *m;
    XButtonPressedEvent *ev = &e->xbutton;

    click = ClkRootWin;
    /* focus monitor if necessary */
    if ((m = wintomon(ev->window)) && m != selmon) {
        unfocus(selmon->sel, 1);
        selmon = m;
        focus(NULL);
    }
    if (ev->window == selmon->barwin) {
        i = x = 0;
        unsigned int occ = 0;
        for (c = m->clients; c; c = c->next)
            occ |= c->tags;
        do {
            /* Do not reserve space for vacant tags */
            if (!(occ & 1 << i || m->tagset[m->seltags] & 1 << i))
                continue;
            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 + TEXTW(selmon->ltsymbol))
            click = ClkLtSymbol;
        else if (ev->x > selmon->ww - (int)TEXTW(stext) - getsystraywidth())
            click = ClkStatusText;
        else
            click = ClkWinTitle;
    } else if ((c = wintoclient(ev->window))) {
        focus(c);
        restack(selmon);
        XAllowEvents(dpy, ReplayPointer, CurrentTime);
        click = ClkClientWin;
    }
    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))
            buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
}

void centeredmaster(Monitor *m) {
    unsigned int i, n, h, mw, mx, my, oty, ety, tw;
    Client *c;

    /* count number of clients in the selected monitor */
    for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++)
        ;
    if (n == 0)
        return;

    /* initialize areas */
    mw = m->ww;
    mx = 0;
    my = 0;
    tw = mw;

    if (n > m->nmaster) {
        /* go mfact box in the center if more than nmaster clients */
        mw = m->nmaster ? m->ww * m->mfact : 0;
        tw = m->ww - mw;

        if (n - m->nmaster > 1) {
            /* only one client */
            mx = (m->ww - mw) / 2;
            tw = (m->ww - mw) / 2;
        }
    }

    oty = 0;
    ety = 0;
    for (i = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
        if (i < m->nmaster) {
            /* nmaster clients are stacked vertically, in the center
             * of the screen */
            h = (m->wh - my) / (MIN(n, m->nmaster) - i);
            resize(c, m->wx + mx, m->wy + my, mw - (2 * c->bw), h - (2 * c->bw), 0);
            my += HEIGHT(c);
        } else {
            /* stack clients are stacked vertically */
            if ((i - m->nmaster) % 2) {
                h = (m->wh - ety) / ((1 + n - i) / 2);
                resize(c, m->wx, m->wy + ety, tw - (2 * c->bw), h - (2 * c->bw), 0);
                ety += HEIGHT(c);
            } else {
                h = (m->wh - oty) / ((1 + n - i) / 2);
                resize(c, m->wx + mx + mw, m->wy + oty, tw - (2 * c->bw), h - (2 * c->bw), 0);
                oty += HEIGHT(c);
            }
        }
}

void centeredfloatingmaster(Monitor *m) {
    unsigned int i, n, w, mh, mw, mx, mxo, my, myo, tx;
    Client *c;

    /* count number of clients in the selected monitor */
    for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++)
        ;
    if (n == 0)
        return;

    /* initialize nmaster area */
    if (n > m->nmaster) {
        /* go mfact box in the center if more than nmaster clients */
        if (m->ww > m->wh) {
            mw = m->nmaster ? m->ww * m->mfact : 0;
            mh = m->nmaster ? m->wh * 0.9 : 0;
        } else {
            mh = m->nmaster ? m->wh * m->mfact : 0;
            mw = m->nmaster ? m->ww * 0.9 : 0;
        }
        mx = mxo = (m->ww - mw) / 2;
        my = myo = (m->wh - mh) / 2;
    } else {
        /* go fullscreen if all clients are in the master area */
        mh = m->wh;
        mw = m->ww;
        mx = mxo = 0;
        my = myo = 0;
    }

    for (i = tx = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
        if (i < m->nmaster) {
            /* nmaster clients are stacked horizontally, in the center
             * of the screen */
            w = (mw + mxo - mx) / (MIN(n, m->nmaster) - i);
            resize(c, m->wx + mx, m->wy + my, w - (2 * c->bw), mh - (2 * c->bw), 0);
            mx += WIDTH(c);
        } else {
            /* stack clients are stacked horizontally */
            w = (m->ww - tx) / (n - i);
            resize(c, m->wx + tx, m->wy, w - (2 * c->bw), m->wh - (2 * c->bw), 0);
            tx += WIDTH(c);
        }
}

void checkotherwm(void) {
    xerrorxlib = XSetErrorHandler(xerrorstart);
    /* this causes an error if some other window manager is running */
    XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
    XSync(dpy, False);
    XSetErrorHandler(xerror);
    XSync(dpy, False);
}

void cleanup(void) {
    Arg a = {.ui = ~0};
    Layout foo = {"", NULL};
    Monitor *m;
    size_t i;

    view(&a);
    selmon->lt[selmon->sellt] = &foo;
    for (m = mons; m; m = m->next)
        while (m->stack)
            unmanage(m->stack, 0);
    XUngrabKey(dpy, AnyKey, AnyModifier, root);
    while (mons)
        cleanupmon(mons);

    if (showsystray) {
        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++)
        free(scheme[i]);
    free(scheme);
    XDestroyWindow(dpy, wmcheckwin);
    drw_free(drw);
    XSync(dpy, False);
    XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
    XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
}

void cleanupmon(Monitor *mon) {
    Monitor *m;

    if (mon == mons)
        mons = mons->next;
    else {
        for (m = mons; m && m->next != mon; m = m->next)
            ;
        m->next = mon->next;
    }
    XUnmapWindow(dpy, mon->barwin);
    XDestroyWindow(dpy, mon->barwin);
    free(mon);
}

void clientmessage(XEvent *e) {
    XWindowAttributes wa;
    XSetWindowAttributes swa;
    XClientMessageEvent *cme = &e->xclient;
    Client *c = wintoclient(cme->window);

    if (showsystray && 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;
            if (!XGetWindowAttributes(dpy, c->win, &wa)) {
                /* use sane defaults */
                wa.width = bh;
                wa.height = bh;
                wa.border_width = 0;
            }
            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);
            /* FIXME not sure if I have to send these events, too */
            sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_FOCUS_IN, 0,
                      systray->win, XEMBED_EMBEDDED_VERSION);
            sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime,
                      XEMBED_WINDOW_ACTIVATE, 0, systray->win, XEMBED_EMBEDDED_VERSION);
            sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_MODALITY_ON,
                      0, systray->win, XEMBED_EMBEDDED_VERSION);
            XSync(dpy, False);
            resizebarwin(selmon);
            updatesystray();
            setclientstate(c, NormalState);
        }
        return;
    }

    if (!c)
        return;
    if (cme->message_type == netatom[NetWMState]) {
        if (cme->data.l[1] == netatom[NetWMFullscreen] ||
            cme->data.l[2] == netatom[NetWMFullscreen])
            setfullscreen(
                c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
                    || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
    } else if (cme->message_type == netatom[NetActiveWindow]) {
        if (c != selmon->sel && !c->isurgent)
            seturgent(c, 1);
    }
}

void configure(Client *c) {
    XConfigureEvent ce;

    ce.type = ConfigureNotify;
    ce.display = dpy;
    ce.event = c->win;
    ce.window = c->win;
    ce.x = c->x;
    ce.y = c->y;
    ce.width = c->w;
    ce.height = c->h;
    ce.border_width = c->bw;
    ce.above = None;
    ce.override_redirect = False;
    XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
}

void configurenotify(XEvent *e) {
    Monitor *m;
    Client *c;
    XConfigureEvent *ev = &e->xconfigure;
    int dirty;

    /* TODO: updategeom handling sucks, needs to be simplified */
    if (ev->window == root) {
        dirty = (sw != ev->width || sh != ev->height);
        sw = ev->width;
        sh = ev->height;
        if (updategeom() || dirty) {
            drw_resize(drw, sw, bh);
            updatebars();
            for (m = mons; m; m = m->next) {
                for (c = m->clients; c; c = c->next)
                    if (c->isfullscreen)
                        resizeclient(c, m->mx, m->my, m->mw, m->mh);
                resizebarwin(m);
            }
            focus(NULL);
            arrange(NULL);
        }
    }
}

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

    if ((c = wintoclient(ev->window))) {
        if (ev->value_mask & CWBorderWidth)
            c->bw = ev->border_width;
        else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
            m = c->mon;
            if (ev->value_mask & CWX) {
                c->oldx = c->x;
                c->x = m->mx + ev->x;
            }
            if (ev->value_mask & CWY) {
                c->oldy = c->y;
                c->y = m->my + ev->y;
            }
            if (ev->value_mask & CWWidth) {
                c->oldw = c->w;
                c->w = ev->width;
            }
            if (ev->value_mask & CWHeight) {
                c->oldh = c->h;
                c->h = ev->height;
            }
            if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
                c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
            if ((c->y + c->h) > m->my + m->mh && c->isfloating)
                c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
            if ((ev->value_mask & (CWX | CWY)) && !(ev->value_mask & (CWWidth | CWHeight)))
                configure(c);
            if (ISVISIBLE(c))
                XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
        } else
            configure(c);
    } else {
        wc.x = ev->x;
        wc.y = ev->y;
        wc.width = ev->width;
        wc.height = ev->height;
        wc.border_width = ev->border_width;
        wc.sibling = ev->above;
        wc.stack_mode = ev->detail;
        XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
    }
    XSync(dpy, False);
}

Monitor *createmon(void) {
    Monitor *m;

    m = ecalloc(1, sizeof(Monitor));
    m->tagset[0] = m->tagset[1] = 1;
    m->mfact = mfact;
    m->nmaster = nmaster;
    m->showbar = showbar;
    m->topbar = topbar;
    m->lt[0] = &layouts[0];
    m->lt[1] = &layouts[1 % LENGTH(layouts)];
    strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
    return m;
}

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

    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);
        updatesystray();
    }
}

void detach(Client *c) {
    Client **tc;

    for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next)
        ;
    *tc = c->next;
}

void detachstack(Client *c) {
    Client **tc, *t;

    for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext)
        ;
    *tc = c->snext;

    if (c == c->mon->sel) {
        for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext)
            ;
        c->mon->sel = t;
    }
}

Monitor *dirtomon(int dir) {
    Monitor *m = NULL;

    if (dir > 0) {
        if (!(m = selmon->next))
            m = mons;
    } else if (selmon == mons)
        for (m = mons; m->next; m = m->next)
            ;
    else
        for (m = mons; m->next != selmon; m = m->next)
            ;
    return m;
}

void resetfntlist(Fnt *orighead, Fnt *curhead) {
    if (orighead != curhead) {
        Fnt *f;
        for (f = orighead; f->next; f = f->next)
            ;
        f->next = curhead;
        for (f = f->next; f->next != orighead; f = f->next)
            ;
        f->next = NULL;
    }
}

enum SgrFlags { REVERSE = 1 << 0, UNDERLINE = 1 << 1, STRIKETHROUGH = 1 << 2, OVERLINE = 1 << 3 };

void drawbar(Monitor *m) {
    int x, w, tw = 0, stw = 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;

    if (showsystray && m == systraytomon(m) && !systrayonleft)
        stw = getsystraywidth();

    /* draw status first so it can be overdrawn by tags later */
    if (m == selmon) { /* status is only drawn on selected monitor */
        char buffer[sizeof(stext)];
        Clr scm[3];
        int wr, rd;
        int pw;
        int fg = 7;
        int bg = 0;
        int fmt = 0;
        int lp = lrpad / 2 - 2;
        Fnt *fset = drw->fonts;

        memcpy(scm, scheme[SchemeNorm], sizeof(scm));

        drw_setscheme(drw, scm);

        /* Handling for font-changing SGR sequences */
        for (tw = 0, wr = 0, rd = 0; stext[rd]; rd++) {
            if (stext[rd] == '' && stext[rd + 1] == '[') {
                size_t alen = strspn(stext + rd + 2, "0123456789;");
                if (stext[rd + alen + 2] == 'm') {
                    buffer[wr] = '\0';
                    tw += TEXTW(buffer) - lrpad;
                    wr = 0;

                    char *ep = stext + rd + 1;
                    while (*ep != 'm') {
                        unsigned v = strtoul(ep + 1, &ep, 10);
                        if (v == 0 || (v >= 10 && v <= 19)) {
                            int fi = v % 10;
                            Fnt *f;
                            Fnt *p;
                            resetfntlist(fset, drw->fonts);
                            for (p = NULL, f = fset; f && fi--; p = f, f = f->next)
                                ;
                            if (f) {
                                if (p) {
                                    p->next = NULL;
                                    for (p = f; p->next; p = p->next)
                                        ;
                                    p->next = fset;
                                }
                                drw_setfontset(drw, f);
                            } else {
                                drw_setfontset(drw, fset);
                            }
                        }
                    }

                    rd += alen + 2;
                    continue;
                }
            }
            buffer[wr++] = stext[rd];
        }
        buffer[wr] = '\0';

        tw += TEXTW(buffer) - lrpad / 2 + 2;
        x = m->ww - tw - stw;

        resetfntlist(fset, drw->fonts);
        drw_setfontset(drw, fset);

        /* Handling of other escapes */
        for (wr = 0, rd = 0; stext[rd]; rd++) {
            if (stext[rd] == '' && stext[rd + 1] == '[') {
                size_t alen = strspn(stext + rd + 2, "0123456789;");
                if (stext[rd + alen + 2] == 'm') {
                    buffer[wr] = '\0';
                    pw = TEXTW(buffer) - lrpad;
                    drw_text(drw, x, 0, pw + lp, bh, lp, buffer, fmt & REVERSE);
                    if (fmt & UNDERLINE)
                        drw_rect(drw, x, (bh + drw->fonts->h) / 2, pw, 1, 1, fmt & REVERSE);
                    if (fmt & STRIKETHROUGH)
                        drw_rect(drw, x, bh / 2, pw, 1, 1, fmt & REVERSE);
                    if (fmt & OVERLINE)
                        drw_rect(drw, x, (bh - drw->fonts->h) / 2, pw, 1, 1, fmt & REVERSE);
                    x += pw + lp;
                    lp = 0;

                    char *ep = stext + rd + 1;
                    while (*ep != 'm') {
                        unsigned v = strtoul(ep + 1, &ep, 10);
                        if (v == 0) {
                            memcpy(scm, scheme[SchemeNorm], sizeof(scm));
                            fg = 7;
                            bg = 0;
                            fmt = 0;
                            resetfntlist(fset, drw->fonts);
                            drw_setfontset(drw, fset);
                        } else if (v == 1) {
                            fg |= 8;
                            scm[0] = barclrs[fg];
                        } else if (v == 4) {
                            fmt |= UNDERLINE;
                        } else if (v == 7) {
                            fmt |= REVERSE;
                        } else if (v == 9) {
                            fmt |= STRIKETHROUGH;
                        } else if (v >= 10 && v <= 19) {
                            int fi = v % 10;
                            Fnt *f;
                            Fnt *p;
                            resetfntlist(fset, drw->fonts);
                            for (p = NULL, f = fset; f && fi--; p = f, f = f->next)
                                ;
                            if (f) {
                                if (p) {
                                    p->next = NULL;
                                    for (p = f; p->next; p = p->next)
                                        ;
                                    p->next = fset;
                                }
                                drw_setfontset(drw, f);
                            } else {
                                drw_setfontset(drw, fset);
                            }
                        } else if (v == 22) {
                            fg &= ~8;
                            scm[0] = barclrs[fg];
                        } else if (v == 24) {
                            fmt &= ~UNDERLINE;
                        } else if (v == 27) {
                            fmt &= ~REVERSE;
                        } else if (v == 29) {
                            fmt &= ~STRIKETHROUGH;
                        } else if (v >= 30 && v <= 37) {
                            fg = v % 10 | (fg & 8);
                            scm[0] = barclrs[fg];
                        } else if (v >= 40 && v <= 47) {
                            bg = v % 10;
                            scm[1] = barclrs[bg];
                        } else if (v == 53) {
                            fmt |= OVERLINE;
                        } else if (v == 55) {
                            fmt &= ~OVERLINE;
                        }
                    }

                    rd += alen + 2;
                    wr = 0;

                    drw_setscheme(drw, scm);
                    continue;
                }
            }
            buffer[wr++] = stext[rd];
        }

        buffer[wr] = '\0';
        pw = TEXTW(buffer) - lrpad;
        drw_text(drw, x, 0, pw + lp, bh, lp, buffer, fmt & REVERSE);
        if (fmt & UNDERLINE)
            drw_rect(drw, x, (bh + drw->fonts->h) / 2, pw, 1, 1, fmt & REVERSE);
        if (fmt & STRIKETHROUGH)
            drw_rect(drw, x, bh / 2, pw, 1, 1, fmt & REVERSE);
        if (fmt & OVERLINE)
            drw_rect(drw, x, (bh - drw->fonts->h) / 2, pw, 1, 1, fmt & REVERSE);

        drw_setscheme(drw, scheme[SchemeStatus]);
    }

    resizebarwin(m);
    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++) {
        /* Do not draw vacant tags */
        if (!(occ & 1 << i || m->tagset[m->seltags] & 1 << i))
            continue;
        w = TEXTW(tags[i]);
        drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeTagsSel : SchemeTagsNorm]);
        drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
        x += w;
    }
    w = TEXTW(m->ltsymbol);
    drw_setscheme(drw, scheme[SchemeTagsNorm]);
    x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);

    if ((w = m->ww - tw - stw - x) > bh) {
        if (m->sel) {
            drw_setscheme(drw, scheme[m == selmon ? SchemeInfoSel : SchemeInfoNorm]);
            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 - stw, bh);
}

void drawbars(void) {
    Monitor *m;

    for (m = mons; m; m = m->next)
        drawbar(m);
}

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

    if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
        return;
    c = wintoclient(ev->window);
    m = c ? c->mon : wintomon(ev->window);
    if (m != selmon) {
        unfocus(selmon->sel, 1);
        selmon = m;
    } else if (!c || c == selmon->sel)
        return;
    focus(c);
}

void expose(XEvent *e) {
    Monitor *m;
    XExposeEvent *ev = &e->xexpose;

    if (ev->count == 0 && (m = wintomon(ev->window))) {
        drawbar(m);
        if (m == selmon)
            updatesystray();
    }
}

void focus(Client *c) {
    if (!c || !ISVISIBLE(c))
        for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext)
            ;
    if (selmon->sel && selmon->sel != c)
        unfocus(selmon->sel, 0);
    if (c) {
        if (c->mon != selmon)
            selmon = c->mon;
        if (c->isurgent)
            seturgent(c, 0);
        detachstack(c);
        attachstack(c);
        grabbuttons(c, 1);
        XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
        setfocus(c);
    } else {
        XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
        XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
    }
    selmon->sel = c;
    drawbars();
}

/* there are some broken focus acquiring clients needing extra handling */
void focusin(XEvent *e) {
    XFocusChangeEvent *ev = &e->xfocus;

    if (selmon->sel && ev->window != selmon->sel->win)
        setfocus(selmon->sel);
}

void focusmon(const Arg *arg) {
    Monitor *m;

    if (!mons->next)
        return;
    if ((m = dirtomon(arg->i)) == selmon)
        return;
    unfocus(selmon->sel, 0);
    selmon = m;
    focus(NULL);
}

void focusstack(const Arg *arg) {
    // Client *c = NULL, *i;
    int i = stackpos(arg);
    Client *c, *p;

    if (i < 0 || (selmon->sel->isfullscreen && lockfullscreen))
        return;

    for (p = NULL, c = selmon->clients; c && (i || !ISVISIBLE(c));
         i -= ISVISIBLE(c) ? 1 : 0, p = c, c = c->next)
        ;
    focus(c ? c : p);
    restack(selmon);
}

void gaplessgrid(Monitor *m) {
    unsigned int n, cols, rows, cn, rn, i, cx, cy, cw, ch;
    Client *c;

    for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++)
        ;
    if (n == 0)
        return;

    /* grid dimensions */
    for (cols = 0; cols <= n / 2; cols++)
        if (cols * cols >= n)
            break;
    if (n == 5) /* set layout against the general calculation: not 1:2:2, but 2:3 */
        cols = 2;
    rows = n / cols;

    /* window geometries */
    cw = cols ? m->ww / cols : m->ww;
    cn = 0; /* current column number */
    rn = 0; /* current row number */
    for (i = 0, c = nexttiled(m->clients); c; i++, c = nexttiled(c->next)) {
        if (i / rows + 1 > cols - n % cols)
            rows = n / cols + 1;
        ch = rows ? m->wh / rows : m->wh;
        cx = m->wx + cn * cw;
        cy = m->wy + rn * ch;
        resize(c, cx, cy, cw - 2 * c->bw, ch - 2 * c->bw, False);
        rn++;
        if (rn >= rows) {
            rn = 0;
            cn++;
        }
    }
}

Atom getatomprop(Client *c, Atom prop) {
    int di;
    unsigned long dl;
    unsigned char *p = NULL;
    Atom da, atom = None;

    /* FIXME getatomprop should return the number of items and a pointer to
     * the stored data instead of this workaround */
    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;
}

unsigned int getsystraywidth(void) {
    unsigned int w = 0;
    Client *i;
    if (showsystray)
        for (i = systray->icons; i; w += i->w + systrayspacing, i = i->next)
            ;
    return w ? w + systrayspacing : 1;
}

int getrootptr(int *x, int *y) {
    int di;
    unsigned int dui;
    Window dummy;

    return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
}

long getstate(Window w) {
    int format;
    long result = -1;
    unsigned char *p = NULL;
    unsigned long n, extra;
    Atom real;

    if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState], &real, &format,
                           &n, &extra, (unsigned char **)&p) != Success)
        return -1;
    if (n != 0)
        result = *p;
    XFree(p);
    return result;
}

int gettextprop(Window w, Atom atom, char *text, unsigned int size) {
    char **list = NULL;
    int n;
    XTextProperty name;

    if (!text || size == 0)
        return 0;
    text[0] = '\0';
    if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
        return 0;
    if (name.encoding == XA_STRING) {
        strncpy(text, (char *)name.value, size - 1);
    } else if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
        strncpy(text, *list, size - 1);
        XFreeStringList(list);
    }
    text[size - 1] = '\0';
    XFree(name.value);
    return 1;
}

void grabbuttons(Client *c, int focused) {
    updatenumlockmask();
    {
        unsigned int i, j;
        unsigned int modifiers[] = {0, LockMask, numlockmask, numlockmask | LockMask};
        XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
        if (!focused)
            XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK, GrabModeSync,
                        GrabModeSync, None, None);
        for (i = 0; i < LENGTH(buttons); i++)
            if (buttons[i].click == ClkClientWin)
                for (j = 0; j < LENGTH(modifiers); j++)
                    XGrabButton(dpy, buttons[i].button, buttons[i].mask | modifiers[j], c->win,
                                False, BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
    }
}

void grabkeys(void) {
    updatenumlockmask();
    {
        unsigned int i, j, k;
        unsigned int modifiers[] = {0, LockMask, numlockmask, numlockmask | LockMask};
        int start, end, skip;
        KeySym *syms;

        XUngrabKey(dpy, AnyKey, AnyModifier, root);
        XDisplayKeycodes(dpy, &start, &end);
        syms = XGetKeyboardMapping(dpy, start, end - start + 1, &skip);
        if (!syms)
            return;
        for (k = start; k <= end; k++)
            for (i = 0; i < LENGTH(keys); i++)
                /* skip modifier codes, we do that ourselves */
                if (keys[i].keysym == syms[(k - start) * skip])
                    for (j = 0; j < LENGTH(modifiers); j++)
                        XGrabKey(dpy, k, keys[i].mod | modifiers[j], root, True, GrabModeAsync,
                                 GrabModeAsync);
        XFree(syms);
    }
}

void incnmaster(const Arg *arg) {
    selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
    arrange(selmon);
}

#ifdef XINERAMA
static int isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
    while (n--)
        if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org &&
            unique[n].width == info->width && unique[n].height == info->height)
            return 0;
    return 1;
}
#endif /* XINERAMA */

void keypress(XEvent *e) {
    unsigned int i;
    KeySym keysym;
    XKeyEvent *ev;

    ev = &e->xkey;
    keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
    for (i = 0; i < LENGTH(keys); i++)
        if (keysym == keys[i].keysym && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state) &&
            keys[i].func)
            keys[i].func(&(keys[i].arg));
}

void killclient(const Arg *arg) {
    if (!selmon->sel)
        return;

    if (!sendevent(selmon->sel->win, wmatom[WMDelete], NoEventMask, wmatom[WMDelete], CurrentTime,
                   0, 0, 0)) {
        XGrabServer(dpy);
        XSetErrorHandler(xerrordummy);
        XSetCloseDownMode(dpy, DestroyAll);
        XKillClient(dpy, selmon->sel->win);
        XSync(dpy, False);
        XSetErrorHandler(xerror);
        XUngrabServer(dpy);
    }
}

void manage(Window w, XWindowAttributes *wa) {
    Client *c, *t = NULL, *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;
    c->w = c->oldw = wa->width;
    c->h = c->oldh = wa->height;
    c->oldbw = wa->border_width;

    updatetitle(c);
    if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
        c->mon = t->mon;
        c->tags = t->tags;
    } else {
        c->mon = selmon;
        applyrules(c);
        term = termforwin(c);
    }

    if (c->x + WIDTH(c) > c->mon->wx + c->mon->ww)
        c->x = c->mon->wx + c->mon->ww - WIDTH(c);
    if (c->y + HEIGHT(c) > c->mon->wy + c->mon->wh)
        c->y = c->mon->wy + c->mon->wh - HEIGHT(c);
    c->x = MAX(c->x, c->mon->wx);
    c->y = MAX(c->y, c->mon->wy);
    c->bw = borderpx;

    wc.border_width = c->bw;
    XConfigureWindow(dpy, w, CWBorderWidth, &wc);
    XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
    configure(c); /* propagates border_width, if size doesn't change */
    updatewindowtype(c);
    updatesizehints(c);
    updatewmhints(c);
    XSelectInput(dpy, w,
                 EnterWindowMask | FocusChangeMask | PropertyChangeMask | StructureNotifyMask);
    grabbuttons(c, 0);
    if (!c->isfloating)
        c->isfloating = c->oldstate = trans != None || c->isfixed;
    if (c->isfloating)
        XRaiseWindow(dpy, c->win);
    attachtop(c);
    attachstack(c);
    XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
                    (unsigned char *)&(c->win), 1);
    XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
    setclientstate(c, NormalState);
    if (c->mon == selmon)
        unfocus(selmon->sel, 0);
    c->mon->sel = c;
    arrange(c->mon);
    XMapWindow(dpy, c->win);
    if (term)
        swallow(term, c);
    focus(NULL);
}

void mappingnotify(XEvent *e) {
    XMappingEvent *ev = &e->xmapping;

    XRefreshKeyboardMapping(ev);
    if (ev->request == MappingKeyboard)
        grabkeys();
}

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

    Client *i;
    if ((i = wintosystrayicon(ev->window))) {
        sendevent(i->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_WINDOW_ACTIVATE,
                  0, systray->win, XEMBED_EMBEDDED_VERSION);
        resizebarwin(selmon);
        updatesystray();
    }

    if (!XGetWindowAttributes(dpy, ev->window, &wa) || wa.override_redirect)
        return;
    if (!wintoclient(ev->window))
        manage(ev->window, &wa);
}

void monocle(Monitor *m) {
    unsigned int n = 0;
    Client *c;

    for (c = m->clients; c; c = c->next)
        if (ISVISIBLE(c))
            n++;
    if (n > 0) /* override layout symbol */
        snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
    for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
        resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
}

void motionnotify(XEvent *e) {
    static Monitor *mon = NULL;
    Monitor *m;
    XMotionEvent *ev = &e->xmotion;

    if (ev->window != root)
        return;
    if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
        unfocus(selmon->sel, 1);
        selmon = m;
        focus(NULL);
    }
    mon = m;
}

void movemouse(const Arg *arg) {
    int x, y, ocx, ocy, nx, ny;
    Client *c;
    Monitor *m;
    XEvent ev;
    Time lasttime = 0;

    if (!(c = selmon->sel))
        return;
    if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
        return;
    restack(selmon);
    ocx = c->x;
    ocy = c->y;
    if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync, None,
                     cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
        return;
    if (!getrootptr(&x, &y))
        return;
    do {
        XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
        switch (ev.type) {
        case ConfigureRequest:
        case Expose:
        case MapRequest:
            handler[ev.type](&ev);
            break;
        case MotionNotify:
            if ((ev.xmotion.time - lasttime) <= (1000 / 60))
                continue;
            lasttime = ev.xmotion.time;

            nx = ocx + (ev.xmotion.x - x);
            ny = ocy + (ev.xmotion.y - y);
            if (abs(selmon->wx - nx) < snap)
                nx = selmon->wx;
            else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
                nx = selmon->wx + selmon->ww - WIDTH(c);
            if (abs(selmon->wy - ny) < snap)
                ny = selmon->wy;
            else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
                ny = selmon->wy + selmon->wh - HEIGHT(c);
            if (!c->isfloating && selmon->lt[selmon->sellt]->arrange &&
                (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
                togglefloating(NULL);
            if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
                resize(c, nx, ny, c->w, c->h, 1);
            break;
        }
    } while (ev.type != ButtonRelease);
    XUngrabPointer(dpy, CurrentTime);
    if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
        sendmon(c, m);
        selmon = m;
        focus(NULL);
    }
}

Client *nexttiled(Client *c) {
    for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next)
        ;
    return c;
}

void pop(Client *c) {
    detach(c);
    attach(c);
    focus(c);
    arrange(c->mon);
}

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

    if ((c = wintosystrayicon(ev->window))) {
        if (ev->atom == XA_WM_NORMAL_HINTS) {
            updatesizehints(c);
            updatesystrayicongeom(c, c->w, c->h);
        } else
            updatesystrayiconstate(c, ev);
        resizebarwin(selmon);
        updatesystray();
    }

    if ((ev->window == root) && (ev->atom == XA_WM_NAME))
        updatestatus();
    else if (ev->state == PropertyDelete)
        return; /* ignore */
    else if ((c = wintoclient(ev->window))) {
        switch (ev->atom) {
        default:
            break;
        case XA_WM_TRANSIENT_FOR:
            if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
                (c->isfloating = (wintoclient(trans)) != NULL))
                arrange(c->mon);
            break;
        case XA_WM_NORMAL_HINTS:
            c->hintsvalid = 0;
            break;
        case XA_WM_HINTS:
            updatewmhints(c);
            drawbars();
            break;
        }
        if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
            updatetitle(c);
            if (c == c->mon->sel)
                drawbar(c->mon);
        }
        if (ev->atom == netatom[NetWMWindowType])
            updatewindowtype(c);
    }
}

void pushstack(const Arg *arg) {
    int i = stackpos(arg);
    Client *sel = selmon->sel, *c, *p;

    if (i < 0)
        return;
    else if (i == 0) {
        detach(sel);
        attach(sel);
    } else {
        for (p = NULL, c = selmon->clients; c; p = c, c = c->next)
            if (!(i -= (ISVISIBLE(c) && c != sel)))
                break;
        c = c ? c : p;
        detach(sel);
        sel->next = c->next;
        c->next = sel;
    }
    arrange(selmon);
}

void quit(const Arg *arg) {
    if (arg->i)
        restart = 1;
    running = 0;
}

Monitor *recttomon(int x, int y, int w, int h) {
    Monitor *m, *r = selmon;
    int a, area = 0;

    for (m = mons; m; m = m->next)
        if ((a = INTERSECT(x, y, w, h, m)) > area) {
            area = a;
            r = m;
        }
    return r;
}

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);
}

void resize(Client *c, int x, int y, int w, int h, int interact) {
    if (applysizehints(c, &x, &y, &w, &h, interact))
        resizeclient(c, x, y, w, h);
}

void resizebarwin(Monitor *m) {
    unsigned int w = m->ww;
    if (showsystray && m == systraytomon(m) && !systrayonleft)
        w -= getsystraywidth();
    XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, w, bh);
}

void resizeclient(Client *c, int x, int y, int w, int h) {
    XWindowChanges wc;

    c->oldx = c->x;
    c->x = wc.x = x;
    c->oldy = c->y;
    c->y = wc.y = y;
    c->oldw = c->w;
    c->w = wc.width = w;
    c->oldh = c->h;
    c->h = wc.height = h;
    if (c->isfloating && c->hasfloatbw && !c->isfullscreen)
        wc.border_width = c->floatborderpx;
    else
        wc.border_width = c->bw;
    XConfigureWindow(dpy, c->win, CWX | CWY | CWWidth | CWHeight | CWBorderWidth, &wc);
    configure(c);
    XSync(dpy, False);
}

void resizemouse(const Arg *arg) {
    int ocx, ocy, nw, nh;
    int ocx2, ocy2, nx, ny;
    Client *c;
    Monitor *m;
    XEvent ev;
    int horizcorner, vertcorner;
    int di;
    unsigned int dui;
    Window dummy;
    Time lasttime = 0;

    if (!(c = selmon->sel))
        return;
    if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
        return;
    restack(selmon);
    ocx = c->x;
    ocy = c->y;
    ocx2 = c->x + c->w;
    ocy2 = c->y + c->h;
    if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync, None,
                     cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
        return;
    if (!XQueryPointer(dpy, c->win, &dummy, &dummy, &di, &di, &nx, &ny, &dui))
        return;
    horizcorner = nx < c->w / 2;
    vertcorner = ny < c->h / 2;
    XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, horizcorner ? (-c->bw) : (c->w + c->bw - 1),
                 vertcorner ? (-c->bw) : (c->h + c->bw - 1));
    do {
        XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
        switch (ev.type) {
        case ConfigureRequest:
        case Expose:
        case MapRequest:
            handler[ev.type](&ev);
            break;
        case MotionNotify:
            if ((ev.xmotion.time - lasttime) <= (1000 / 60))
                continue;
            lasttime = ev.xmotion.time;

            nx = horizcorner ? ev.xmotion.x : c->x;
            ny = vertcorner ? ev.xmotion.y : c->y;
            nw = MAX(horizcorner ? (ocx2 - nx) : (ev.xmotion.x - ocx - 2 * c->bw + 1), 1);
            nh = MAX(vertcorner ? (ocy2 - ny) : (ev.xmotion.y - ocy - 2 * c->bw + 1), 1);

            if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww &&
                c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh) {
                if (!c->isfloating && selmon->lt[selmon->sellt]->arrange &&
                    (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
                    togglefloating(NULL);
            }
            if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
                resize(c, nx, ny, nw, nh, 1);
            break;
        }
    } while (ev.type != ButtonRelease);
    XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, horizcorner ? (-c->bw) : (c->w + c->bw - 1),
                 vertcorner ? (-c->bw) : (c->h + c->bw - 1));
    XUngrabPointer(dpy, CurrentTime);
    while (XCheckMaskEvent(dpy, EnterWindowMask, &ev))
        ;
    if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
        sendmon(c, m);
        selmon = m;
        focus(NULL);
    }
}

void resizerequest(XEvent *e) {
    XResizeRequestEvent *ev = &e->xresizerequest;
    Client *i;

    if ((i = wintosystrayicon(ev->window))) {
        updatesystrayicongeom(i, ev->width, ev->height);
        resizebarwin(selmon);
        updatesystray();
    }
}

void restack(Monitor *m) {
    Client *c;
    XEvent ev;
    XWindowChanges wc;

    drawbar(m);
    if (!m->sel)
        return;
    if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
        XRaiseWindow(dpy, m->sel->win);
    if (m->lt[m->sellt]->arrange) {
        wc.stack_mode = Below;
        wc.sibling = m->barwin;
        for (c = m->stack; c; c = c->snext)
            if (!c->isfloating && ISVISIBLE(c)) {
                XConfigureWindow(dpy, c->win, CWSibling | CWStackMode, &wc);
                wc.sibling = c->win;
            }
    }
    XSync(dpy, False);
    while (XCheckMaskEvent(dpy, EnterWindowMask, &ev))
        ;
}

void run(void) {
    XEvent ev;
    /* main event loop */
    XSync(dpy, False);
    while (running && !XNextEvent(dpy, &ev))
        if (handler[ev.type])
            handler[ev.type](&ev); /* call handler */
}

void scan(void) {
    unsigned int i, num;
    Window d1, d2, *wins = NULL;
    XWindowAttributes wa;

    if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
        for (i = 0; i < num; i++) {
            if (!XGetWindowAttributes(dpy, wins[i], &wa) || wa.override_redirect ||
                XGetTransientForHint(dpy, wins[i], &d1))
                continue;
            if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
                manage(wins[i], &wa);
        }
        for (i = 0; i < num; i++) { /* now the transients */
            if (!XGetWindowAttributes(dpy, wins[i], &wa))
                continue;
            if (XGetTransientForHint(dpy, wins[i], &d1) &&
                (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
                manage(wins[i], &wa);
        }
        if (wins)
            XFree(wins);
    }
}

void sendmon(Client *c, Monitor *m) {
    if (c->mon == m)
        return;
    unfocus(c, 1);
    detach(c);
    detachstack(c);
    c->mon = m;
    c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
    attachtop(c);
    attachstack(c);
    focus(NULL);
    arrange(NULL);
}

void setclientstate(Client *c, long state) {
    long data[] = {state, None};

    XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32, PropModeReplace,
                    (unsigned char *)data, 2);
}

int sendevent(Window w, Atom proto, int mask, long d0, long d1, long d2, long d3, long d4) {
    int n;
    Atom *protocols, mt;
    int exists = 0;
    XEvent ev;

    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 = w;
        ev.xclient.message_type = mt;
        ev.xclient.format = 32;
        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;
}

void setfocus(Client *c) {
    if (!c->neverfocus) {
        XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
        XChangeProperty(dpy, root, netatom[NetActiveWindow], XA_WINDOW, 32, PropModeReplace,
                        (unsigned char *)&(c->win), 1);
    }
    sendevent(c->win, wmatom[WMTakeFocus], NoEventMask, wmatom[WMTakeFocus], CurrentTime, 0, 0, 0);
}

void setfullscreen(Client *c, int fullscreen) {
    if (fullscreen && !c->isfullscreen) {
        XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32, PropModeReplace,
                        (unsigned char *)&netatom[NetWMFullscreen], 1);
        c->isfullscreen = 1;
        c->oldstate = c->isfloating;
        c->oldbw = c->bw;
        c->bw = 0;
        c->isfloating = 1;
        resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
        XRaiseWindow(dpy, c->win);
    } else if (!fullscreen && c->isfullscreen) {
        XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32, PropModeReplace,
                        (unsigned char *)0, 0);
        c->isfullscreen = 0;
        c->isfloating = c->oldstate;
        c->bw = c->oldbw;
        c->x = c->oldx;
        c->y = c->oldy;
        c->w = c->oldw;
        c->h = c->oldh;
        resizeclient(c, c->x, c->y, c->w, c->h);
        arrange(c->mon);
    }
}

void setlayout(const Arg *arg) {
    if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
        selmon->sellt ^= 1;
    if (arg && arg->v)
        selmon->lt[selmon->sellt] = (Layout *)arg->v;
    strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
    if (selmon->sel)
        arrange(selmon);
    else
        drawbar(selmon);
}

/* arg > 1.0 will set mfact absolutely */
void setmfact(const Arg *arg) {
    float f;

    if (!arg || !selmon->lt[selmon->sellt]->arrange)
        return;
    f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
    if (f < 0.05 || f > 0.95)
        return;
    selmon->mfact = f;
    arrange(selmon);
}

void setup(void) {
    int i;
    XSetWindowAttributes wa;
    Atom utf8string;
    struct sigaction sa;

    /* do not transform children into zombies when they terminate */
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = SA_NOCLDSTOP | SA_NOCLDWAIT | SA_RESTART;
    sa.sa_handler = SIG_IGN;
    sigaction(SIGCHLD, &sa, NULL);

    /* clean up any zombies (inherited from .xinitrc etc) immediately */
    while (waitpid(-1, NULL, WNOHANG) > 0)
        ;

    signal(SIGHUP, sighup);
    signal(SIGTERM, sigterm);

    /* init screen */
    screen = DefaultScreen(dpy);
    sw = DisplayWidth(dpy, screen);
    sh = DisplayHeight(dpy, screen);
    root = RootWindow(dpy, screen);
    drw = drw_create(dpy, screen, root, sw, sh);
    if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
        die("no fonts could be loaded.");
    lrpad = drw->fonts->h;
    bh = drw->fonts->h + 2;
    updategeom();
    /* init atoms */
    utf8string = XInternAtom(dpy, "UTF8_STRING", False);
    wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
    wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
    wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
    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[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
    netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
    netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
    netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
    netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
    netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
    netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
    xatom[Manager] = XInternAtom(dpy, "MANAGER", False);
    xatom[Xembed] = XInternAtom(dpy, "_XEMBED", False);
    xatom[XembedInfo] = XInternAtom(dpy, "_XEMBED_INFO", False);
    /* init cursors */
    cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
    cursor[CurResize] = drw_cur_create(drw, XC_sizing);
    cursor[CurMove] = drw_cur_create(drw, XC_fleur);
    /* init appearance */
    scheme = ecalloc(LENGTH(barschemes), sizeof(Clr *));
    for (i = 0; i < LENGTH(barschemes); i++)
        scheme[i] = drw_scm_create(drw, barschemes[i], 3);

    barclrs = ecalloc(LENGTH(colors), sizeof(Clr));
    for (i = 0; i < LENGTH(colors); i++)
        drw_clr_create(drw, &barclrs[i], colors[i]);

    /* init system tray */
    updatesystray();
    /* init bars */
    updatebars();
    updatestatus();
    /* supporting window for NetWMCheck */
    wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
    XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32, PropModeReplace,
                    (unsigned char *)&wmcheckwin, 1);
    XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8, PropModeReplace,
                    (unsigned char *)"dwm", 3);
    XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32, PropModeReplace,
                    (unsigned char *)&wmcheckwin, 1);
    /* EWMH support per view */
    XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32, PropModeReplace,
                    (unsigned char *)netatom, NetLast);
    XDeleteProperty(dpy, root, netatom[NetClientList]);
    /* select events */
    wa.cursor = cursor[CurNormal]->cursor;
    wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask | ButtonPressMask |
                    PointerMotionMask | EnterWindowMask | LeaveWindowMask | StructureNotifyMask |
                    PropertyChangeMask;
    XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
    XSelectInput(dpy, root, wa.event_mask);
    grabkeys();
    focus(NULL);
}

void seturgent(Client *c, int urg) {
    XWMHints *wmh;

    c->isurgent = urg;
    if (!(wmh = XGetWMHints(dpy, c->win)))
        return;
    wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
    XSetWMHints(dpy, c->win, wmh);
    XFree(wmh);
}

void showhide(Client *c) {
    if (!c)
        return;
    if (ISVISIBLE(c)) {
        /* show clients top down */
        XMoveWindow(dpy, c->win, c->x, c->y);
        if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
            resize(c, c->x, c->y, c->w, c->h, 0);
        showhide(c->snext);
    } else {
        /* hide clients bottom up */
        showhide(c->snext);
        XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
    }
}

void sighup(int unused) {
    Arg a = {.i = 1};
    quit(&a);
}

void sigterm(int unused) {
    Arg a = {.i = 0};
    quit(&a);
}

void spawn(const Arg *arg) {
    if (arg->v == dmenucmd)
        dmenumon[0] = '0' + selmon->num;
    if (fork() == 0) {
        if (dpy)
            close(ConnectionNumber(dpy));
        setsid();
        execvp(((char **)arg->v)[0], (char **)arg->v);
        die("dwm: execvp '%s' failed:", ((char **)arg->v)[0]);
    }
}

void spawnscratch(const Arg *arg) {
    if (fork() == 0) {
        if (dpy)
            close(ConnectionNumber(dpy));
        setsid();
        execvp(((char **)arg->v)[1], ((char **)arg->v) + 1);
        fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[1]);
        perror(" failed");
        exit(EXIT_SUCCESS);
    }
}

int stackpos(const Arg *arg) {
    int n, i;
    Client *c, *l;

    if (!selmon->clients)
        return -1;

    if (arg->i == PREVSEL) {
        for (l = selmon->stack; l && (!ISVISIBLE(l) || l == selmon->sel); l = l->snext)
            ;
        if (!l)
            return -1;
        for (i = 0, c = selmon->clients; c != l; i += ISVISIBLE(c) ? 1 : 0, c = c->next)
            ;
        return i;
    } else if (ISINC(arg->i)) {
        if (!selmon->sel)
            return -1;
        for (i = 0, c = selmon->clients; c != selmon->sel; i += ISVISIBLE(c) ? 1 : 0, c = c->next)
            ;
        for (n = i; c; n += ISVISIBLE(c) ? 1 : 0, c = c->next)
            ;
        return MOD(i + GETINC(arg->i), n);
    } else if (arg->i < 0) {
        for (i = 0, c = selmon->clients; c; i += ISVISIBLE(c) ? 1 : 0, c = c->next)
            ;
        return MAX(i + arg->i, 0);
    } else
        return arg->i;
}

void tag(const Arg *arg) {
    if (selmon->sel && arg->ui & TAGMASK) {
        selmon->sel->tags = arg->ui & TAGMASK;
        focus(NULL);
        arrange(selmon);
    }
}

void tagmon(const Arg *arg) {
    if (!selmon->sel || !mons->next)
        return;
    sendmon(selmon->sel, dirtomon(arg->i));
}

void tile(Monitor *m) {
    unsigned int i, n, h, mw, my, ty;
    Client *c;

    for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++)
        ;
    if (n == 0)
        return;

    if (n > m->nmaster)
        mw = m->nmaster ? m->ww * m->mfact : 0;
    else
        mw = m->ww;
    for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
        if (i < m->nmaster) {
            h = (m->wh - my) / (MIN(n, m->nmaster) - i);
            resize(c, m->wx, m->wy + my, mw - (2 * c->bw), h - (2 * c->bw), 0);
            if (my + HEIGHT(c) < m->wh)
                my += HEIGHT(c);
        } else {
            h = (m->wh - ty) / (n - i);
            resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2 * c->bw), h - (2 * c->bw), 0);
            if (ty + HEIGHT(c) < m->wh)
                ty += HEIGHT(c);
        }
}

void togglebar(const Arg *arg) {
    selmon->showbar = !selmon->showbar;
    updatebarpos(selmon);
    resizebarwin(selmon);
    if (showsystray) {
        XWindowChanges wc;
        if (!selmon->showbar)
            wc.y = -bh;
        else if (selmon->showbar) {
            wc.y = 0;
            if (!selmon->topbar)
                wc.y = selmon->mh - bh;
        }
        XConfigureWindow(dpy, systray->win, CWY, &wc);
    }
    arrange(selmon);
}

void togglefloating(const Arg *arg) {
    if (!selmon->sel)
        return;
    if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
        return;
    selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
    if (selmon->sel->isfloating)
        resize(selmon->sel, selmon->sel->x, selmon->sel->y, selmon->sel->w, selmon->sel->h, 0);
    arrange(selmon);
}

void togglefullscr(const Arg *arg) {
    if (selmon->sel)
        setfullscreen(selmon->sel, !selmon->sel->isfullscreen);
}

void togglescratch(const Arg *arg) {
    Client *c;
    unsigned int found = 0;

    for (c = selmon->clients; c && !(found = c->scratchkey == ((char **)arg->v)[0][0]); c = c->next)
        ;
    if (found) {
        c->tags = ISVISIBLE(c) ? 0 : selmon->tagset[selmon->seltags];
        focus(NULL);
        arrange(selmon);

        if (ISVISIBLE(c)) {
            focus(c);
            restack(selmon);
        }

    } else {
        spawnscratch(arg);
    }
}

void toggletag(const Arg *arg) {
    unsigned int newtags;

    if (!selmon->sel)
        return;
    newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
    if (newtags) {
        selmon->sel->tags = newtags;
        focus(NULL);
        arrange(selmon);
    }
}

void toggleview(const Arg *arg) {
    unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);

    if (newtagset) {
        selmon->tagset[selmon->seltags] = newtagset;
        focus(NULL);
        arrange(selmon);
    }
}

void unfocus(Client *c, int setfocus) {
    if (!c)
        return;
    grabbuttons(c, 0);
    XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
    if (setfocus) {
        XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
        XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
    }
}

void 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) {
        wc.border_width = c->oldbw;
        XGrabServer(dpy); /* avoid race conditions */
        XSetErrorHandler(xerrordummy);
        XSelectInput(dpy, c->win, NoEventMask);
        XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
        XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
        setclientstate(c, WithdrawnState);
        XSync(dpy, False);
        XSetErrorHandler(xerror);
        XUngrabServer(dpy);
    }
    free(c);
    if (!s) {
        arrange(m);
        focus(NULL);
        updateclientlist();
    }
}

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

    if ((c = wintoclient(ev->window))) {
        if (ev->send_event)
            setclientstate(c, WithdrawnState);
        else
            unmanage(c, 0);
    } else if ((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);
        updatesystray();
    }
}

void updatebars(void) {
    unsigned int w;
    Monitor *m;
    XSetWindowAttributes wa = {.override_redirect = True,
                               .background_pixmap = ParentRelative,
                               .event_mask = ButtonPressMask | ExposureMask};
    XClassHint ch = {"dwm", "dwm"};
    for (m = mons; m; m = m->next) {
        if (m->barwin)
            continue;
        w = m->ww;
        if (showsystray && m == systraytomon(m))
            w -= getsystraywidth();
        m->barwin = XCreateWindow(dpy, root, m->wx, m->by, w, bh, 0, DefaultDepth(dpy, screen),
                                  CopyFromParent, DefaultVisual(dpy, screen),
                                  CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
        XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
        if (showsystray && m == systraytomon(m))
            XMapRaised(dpy, systray->win);
        XMapRaised(dpy, m->barwin);
        XSetClassHint(dpy, m->barwin, &ch);
    }
}

void 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;
}

void updateclientlist() {
    Client *c;
    Monitor *m;

    XDeleteProperty(dpy, root, netatom[NetClientList]);
    for (m = mons; m; m = m->next)
        for (c = m->clients; c; c = c->next)
            XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
                            (unsigned char *)&(c->win), 1);
}

int updategeom(void) {
    int dirty = 0;

#ifdef XINERAMA
    if (XineramaIsActive(dpy)) {
        int i, j, n, nn;
        Client *c;
        Monitor *m;
        XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
        XineramaScreenInfo *unique = NULL;

        for (n = 0, m = mons; m; m = m->next, n++)
            ;
        /* only consider unique geometries as separate screens */
        unique = ecalloc(nn, sizeof(XineramaScreenInfo));
        for (i = 0, j = 0; i < nn; i++)
            if (isuniquegeom(unique, j, &info[i]))
                memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
        XFree(info);
        nn = j;

        /* new monitors if nn > n */
        for (i = n; i < nn; i++) {
            for (m = mons; m && m->next; m = m->next)
                ;
            if (m)
                m->next = createmon();
            else
                mons = createmon();
        }
        for (i = 0, m = mons; i < nn && m; m = m->next, i++)
            if (i >= n || unique[i].x_org != m->mx || unique[i].y_org != m->my ||
                unique[i].width != m->mw || unique[i].height != m->mh) {
                dirty = 1;
                m->num = i;
                m->mx = m->wx = unique[i].x_org;
                m->my = m->wy = unique[i].y_org;
                m->mw = m->ww = unique[i].width;
                m->mh = m->wh = unique[i].height;
                updatebarpos(m);
            }
        /* removed monitors if n > nn */
        for (i = nn; i < n; i++) {
            for (m = mons; m && m->next; m = m->next)
                ;
            while ((c = m->clients)) {
                dirty = 1;
                m->clients = c->next;
                detachstack(c);
                c->mon = mons;
                attachtop(c);
                attachstack(c);
            }
            if (m == selmon)
                selmon = mons;
            cleanupmon(m);
        }
        free(unique);
    } else
#endif /* XINERAMA */
    {  /* default monitor setup */
        if (!mons)
            mons = createmon();
        if (mons->mw != sw || mons->mh != sh) {
            dirty = 1;
            mons->mw = mons->ww = sw;
            mons->mh = mons->wh = sh;
            updatebarpos(mons);
        }
    }
    if (dirty) {
        selmon = mons;
        selmon = wintomon(root);
    }
    return dirty;
}

void updatenumlockmask(void) {
    unsigned int i, j;
    XModifierKeymap *modmap;

    numlockmask = 0;
    modmap = XGetModifierMapping(dpy);
    for (i = 0; i < 8; i++)
        for (j = 0; j < modmap->max_keypermod; j++)
            if (modmap->modifiermap[i * modmap->max_keypermod + j] ==
                XKeysymToKeycode(dpy, XK_Num_Lock))
                numlockmask = (1 << i);
    XFreeModifiermap(modmap);
}

void updatesizehints(Client *c) {
    long msize;
    XSizeHints size;

    if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
        /* size is uninitialized, ensure that size.flags aren't used */
        size.flags = PSize;
    if (size.flags & PBaseSize) {
        c->basew = size.base_width;
        c->baseh = size.base_height;
    } else if (size.flags & PMinSize) {
        c->basew = size.min_width;
        c->baseh = size.min_height;
    } else
        c->basew = c->baseh = 0;
    if (size.flags & PResizeInc) {
        c->incw = size.width_inc;
        c->inch = size.height_inc;
    } else
        c->incw = c->inch = 0;
    if (size.flags & PMaxSize) {
        c->maxw = size.max_width;
        c->maxh = size.max_height;
    } else
        c->maxw = c->maxh = 0;
    if (size.flags & PMinSize) {
        c->minw = size.min_width;
        c->minh = size.min_height;
    } else if (size.flags & PBaseSize) {
        c->minw = size.base_width;
        c->minh = size.base_height;
    } else
        c->minw = c->minh = 0;
    if (size.flags & PAspect) {
        c->mina = (float)size.min_aspect.y / size.min_aspect.x;
        c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
    } else
        c->maxa = c->mina = 0.0;
    c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
    c->hintsvalid = 1;
}

void updatestatus(void) {
    if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
        strcpy(stext, "dwm-" VERSION);
    drawbar(selmon);
    updatesystray();
}

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;
        }
    }
}

void updatesystrayiconstate(Client *i, XPropertyEvent *ev) {
    long flags;
    int code = 0;

    if (!showsystray || !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);
}

void updatesystray(void) {
    XSetWindowAttributes wa;
    XWindowChanges wc;
    Client *i;
    Monitor *m = systraytomon(NULL);
    unsigned int x = m->mx + m->mw;
    unsigned int sw = TEXTW(stext) - lrpad + systrayspacing;
    unsigned int w = 1;

    if (!showsystray)
        return;
    if (systrayonleft)
        x -= sw + lrpad / 2;
    if (!systray) {
        /* init systray */
        if (!(systray = (Systray *)calloc(1, sizeof(Systray))))
            die("fatal: could not malloc() %u bytes\n", sizeof(Systray));
        systray->win =
            XCreateSimpleWindow(dpy, root, x, m->by, w, bh, 0, 0, scheme[SchemeSel][ColBg].pixel);
        wa.event_mask = ButtonPressMask | ExposureMask;
        wa.override_redirect = True;
        wa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
        XSelectInput(dpy, systray->win, SubstructureNotifyMask);
        XChangeProperty(dpy, systray->win, netatom[NetSystemTrayOrientation], XA_CARDINAL, 32,
                        PropModeReplace, (unsigned char *)&netatom[NetSystemTrayOrientationHorz],
                        1);
        XChangeWindowAttributes(dpy, systray->win, CWEventMask | CWOverrideRedirect | CWBackPixel,
                                &wa);
        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;
        }
    }
    for (w = 0, i = systray->icons; i; i = i->next) {
        /* make sure the background color stays the same */
        wa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
        XChangeWindowAttributes(dpy, i->win, CWBackPixel, &wa);
        XMapRaised(dpy, i->win);
        w += systrayspacing;
        i->x = w;
        XMoveResizeWindow(dpy, i->win, i->x, 0, i->w, i->h);
        w += i->w;
        if (i->mon != m)
            i->mon = m;
    }
    w = w ? w + systrayspacing : 1;
    x -= w;
    XMoveResizeWindow(dpy, systray->win, x, m->by, w, bh);
    wc.x = x;
    wc.y = m->by;
    wc.width = w;
    wc.height = bh;
    wc.stack_mode = Above;
    wc.sibling = m->barwin;
    XConfigureWindow(dpy, systray->win, CWX | CWY | CWWidth | CWHeight | CWSibling | CWStackMode,
                     &wc);
    XMapWindow(dpy, systray->win);
    XMapSubwindows(dpy, systray->win);
    /* redraw background */
    XSetForeground(dpy, drw->gc, scheme[SchemeNorm][ColBg].pixel);
    XFillRectangle(dpy, systray->win, drw->gc, 0, 0, w, bh);
    XSync(dpy, False);
}

void updatetitle(Client *c) {
    if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
        gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
    if (c->name[0] == '\0') /* hack to mark broken clients */
        strcpy(c->name, broken);
}

void updatewindowtype(Client *c) {
    Atom state = getatomprop(c, netatom[NetWMState]);
    Atom wtype = getatomprop(c, netatom[NetWMWindowType]);

    if (state == netatom[NetWMFullscreen])
        setfullscreen(c, 1);
    if (wtype == netatom[NetWMWindowTypeDialog])
        c->isfloating = 1;
}

void updatewmhints(Client *c) {
    XWMHints *wmh;

    if ((wmh = XGetWMHints(dpy, c->win))) {
        if (c == selmon->sel && wmh->flags & XUrgencyHint) {
            wmh->flags &= ~XUrgencyHint;
            XSetWMHints(dpy, c->win, wmh);
        } else
            c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
        if (wmh->flags & InputHint)
            c->neverfocus = !wmh->input;
        else
            c->neverfocus = 0;
        XFree(wmh);
    }
}

void view(const Arg *arg) {
    if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
        return;
    selmon->seltags ^= 1; /* toggle sel tagset */
    if (arg->ui & TAGMASK)
        selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
    focus(NULL);
    arrange(selmon);
}

pid_t winpid(Window w) {

    pid_t result = 0;

#ifdef __linux__
    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;

#endif /* __linux__ */

#ifdef __OpenBSD__
    Atom type;
    int format;
    unsigned long len, bytes;
    unsigned char *prop;
    pid_t ret;

    if (XGetWindowProperty(dpy, w, XInternAtom(dpy, "_NET_WM_PID", 0), 0, 1, False, AnyPropertyType,
                           &type, &format, &len, &bytes, &prop) != Success ||
        !prop)
        return 0;

    ret = *(pid_t *)prop;
    XFree(prop);
    result = ret;

#endif /* __OpenBSD__ */
    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__*/

#ifdef __OpenBSD__
    int n;
    kvm_t *kd;
    struct kinfo_proc *kp;

    kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, NULL);
    if (!kd)
        return 0;

    kp = kvm_getprocs(kd, KERN_PROC_PID, p, sizeof(*kp), &n);
    v = kp->p_ppid;
#endif /* __OpenBSD__ */

    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 (c = m->clients; c; c = c->next)
            if (c->win == w)
                return c;
    return NULL;
}

Monitor *wintomon(Window w) {
    int x, y;
    Client *c;
    Monitor *m;

    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;
    if ((c = wintoclient(w)))
        return c->mon;
    return selmon;
}

Client *wintosystrayicon(Window w) {
    Client *i = NULL;

    if (!showsystray || !w)
        return i;
    for (i = systray->icons; i && i->win != w; i = i->next)
        ;
    return i;
}

/* 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. */
int xerror(Display *dpy, XErrorEvent *ee) {
    if (ee->error_code == BadWindow ||
        (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch) ||
        (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable) ||
        (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable) ||
        (ee->request_code == X_PolySegment && ee->error_code == BadDrawable) ||
        (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch) ||
        (ee->request_code == X_GrabButton && ee->error_code == BadAccess) ||
        (ee->request_code == X_GrabKey && ee->error_code == BadAccess) ||
        (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
        return 0;
    fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n", ee->request_code,
            ee->error_code);
    return xerrorxlib(dpy, ee); /* may call exit */
}

int xerrordummy(Display *dpy, XErrorEvent *ee) { return 0; }

/* Startup Error handler to check if another window manager
 * is already running. */
int xerrorstart(Display *dpy, XErrorEvent *ee) {
    die("dwm: another window manager is already running");
    return -1;
}

Monitor *systraytomon(Monitor *m) {
    Monitor *t;
    int i, n;
    if (!systraypinning) {
        if (!m)
            return selmon;
        return m == selmon ? m : NULL;
    }
    for (n = 1, t = mons; t && t->next; n++, t = t->next)
        ;
    for (i = 1, t = mons; t && t->next && i < systraypinning; i++, t = t->next)
        ;
    if (systraypinningfailfirst && n < systraypinning)
        return mons;
    return t;
}

void zoom(const Arg *arg) {
    Client *c = selmon->sel;

    if (!selmon->lt[selmon->sellt]->arrange || !c || c->isfloating)
        return;
    if (c == nexttiled(selmon->clients) && !(c = nexttiled(c->next)))
        return;
    pop(c);
}

void resource_load(XrmDatabase db, char *name, enum resource_type rtype, void *dst) {
    char *sdst = NULL;
    int *idst = NULL;
    float *fdst = NULL;

    sdst = dst;
    idst = dst;
    fdst = dst;

    char fullname[256];
    char *type;
    XrmValue ret;

    snprintf(fullname, sizeof(fullname), "%s.%s", "dwm", name);
    fullname[sizeof(fullname) - 1] = '\0';

    XrmGetResource(db, fullname, "*", &type, &ret);
    if (!(ret.addr == NULL || strncmp("String", type, 64))) {
        switch (rtype) {
        case STRING:
            strcpy(sdst, ret.addr);
            break;
        case INTEGER:
            *idst = strtoul(ret.addr, NULL, 10);
            break;
        case FLOAT:
            *fdst = strtof(ret.addr, NULL);
            break;
        }
    }
}

void load_xresources(void) {
    Display *display;
    char *resm;
    XrmDatabase db;
    ResourcePref *p;

    display = XOpenDisplay(NULL);
    resm = XResourceManagerString(display);
    if (!resm)
        return;

    db = XrmGetStringDatabase(resm);
    for (p = resources; p < resources + LENGTH(resources); p++)
        resource_load(db, p->name, p->type, p->dst);
    XCloseDisplay(display);
}

int main(int argc, char *argv[]) {
    if (argc == 2 && !strcmp("-v", argv[1]))
        die("dwm-" VERSION);
    else if (argc != 1)
        die("usage: dwm [-v]");
    if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
        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();
    XrmInitialize();
    load_xresources();
    setup();
#ifdef __OpenBSD__
    if (pledge("stdio rpath proc exec ps", NULL) == -1)
        die("pledge");
#endif /* __OpenBSD__ */
    scan();
    run();
    if (restart)
        execvp(argv[0], argv);
    cleanup();
    XCloseDisplay(dpy);
    return EXIT_SUCCESS;
}