/* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
* See LICENSE file for 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.
*
* Calls to fetch an X event from the event queue are blocking. Due reading
* status text from standard input, a select()-driven main loop has been
* implemented which selects for reads on the X connection and STDIN_FILENO to
* handle all data smoothly. 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 global
* doubly-linked client list, the focus history is remembered through a global
* stack list. Each client contains an array of Bools of the same size as the
* global tags array to indicate the tags of a client. For each client dwm
* creates a small title window, which is resized whenever the (_NET_)WM_NAME
* properties are updated or the client is moved/resized.
*
* Keys and tagging rules are organized as arrays and defined in the config.h
* file. These arrays are kept static in event.o and tag.o respectively,
* because no other part of dwm needs access to them. The current layout is
* represented by the lt pointer.
*
* To understand everything else, start reading main.c:main().
*/
#include "config.h"
#include <X11/Xlib.h>
/* mask shorthands, used in event.c and client.c */
#define BUTTONMASK (ButtonPressMask | ButtonReleaseMask)
enum { NetSupported, NetWMName, NetLast }; /* EWMH atoms */
enum { WMProtocols, WMDelete, WMState, WMLast }; /* default atoms */
enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
enum { ColBorder, ColFG, ColBG, ColLast }; /* color */
typedef struct Client Client;
struct Client {
char name[256];
int x, y, w, h;
int rx, ry, rw, rh; /* revert geometry */
int basew, baseh, incw, inch, maxw, maxh, minw, minh;
int minax, minay, maxax, maxay;
long flags;
unsigned int border;
Bool isbanned, isfixed, ismax, isfloating;
Bool *tags;
Client *next;
Client *prev;
Client *snext;
Window win;
};
typedef struct {
int x, y, w, h;
unsigned long norm[ColLast];
unsigned long sel[ColLast];
Drawable drawable;
GC gc;
struct {
int ascent;
int descent;
int height;
XFontSet set;
XFontStruct *xfont;
} font;
} DC; /* draw context */
typedef struct {
const char *symbol;
void (*arrange)(void);
} Layout;
extern const char *tags[]; /* all tags */
char stext[256]; /* status text */
int screen, sx, sy, sw, sh; /* screen geometry */
int wax, way, wah, waw; /* windowarea geometry */
unsigned int bh, blw; /* bar height, bar layout label width */
unsigned int ntags, numlockmask; /* number of tags, dynamic lock mask */
void (*handler[LASTEvent])(XEvent *); /* event handler */
Atom wmatom[WMLast], netatom[NetLast];
Bool selscreen, *seltag; /* seltag is array of Bool */
Client *clients, *sel, *stack; /* global client list and stack */
Cursor cursor[CurLast];
DC dc; /* global draw context */
Display *dpy;
Layout *lt;
Window root, barwin;
/* client.c */
void attach(Client *c); /* attaches c to global client list */
void configure(Client *c); /* send synthetic configure event */
void detach(Client *c); /* detaches c from global client list */
void focus(Client *c); /* focus c, c may be NULL */
void killclient(const char *arg); /* kill c nicely */
void manage(Window w, XWindowAttributes *wa); /* manage new client */
void resize(Client *c, int x, int y,
int w, int h, Bool sizehints); /* resize with given coordinates c*/
void togglefloating(const char *arg); /* toggles focused client between floating/tiled state */
void updatesizehints(Client *c); /* update the size hint variables of c */
void updatetitle(Client *c); /* update the name of c */
void unmanage(Client *c); /* destroy c */
/* draw.c */
void drawstatus(void); /* draw the bar */
void drawtext(const char *text, unsigned long col[ColLast]); /* draw text */
unsigned int textw(const char *text); /* return the width of text in px*/
/* event.c */
void grabkeys(void); /* grab all keys defined in config.h */
/* layout.c */
void floating(void); /* arranges all windows floating */
void focusclient(const char *arg); /* focuses next(1)/previous(-1) visible client */
void incmasterw(const char *arg); /* increments the master width with arg's index value */
void incnmaster(const char *arg); /* increments nmaster with arg's index value */
void initlayouts(void); /* initialize layout array */
Client *nexttiled(Client *c); /* returns tiled successor of c */
void restack(void); /* restores z layers of all clients */
void setlayout(const char *arg); /* sets layout, -1 toggles */
void togglemax(const char *arg); /* toggles maximization of floating client */
void zoom(const char *arg); /* zooms the focused client to master area, arg is ignored */
/* main.c */
void quit(const char *arg); /* quit dwm nicely */
void sendevent(Window w, Atom a, long value); /* send synthetic event to w */
int xerror(Display *dsply, XErrorEvent *ee); /* dwm's X error handler */
/* tag.c */
void compileregs(void); /* initialize regexps of rules defined in config.h */
Bool isvisible(Client *c); /* returns True if client is visible */
void settags(Client *c, Client *trans); /* sets tags of c */
void tag(const char *arg); /* tags c with arg's index */
void toggletag(const char *arg); /* toggles c tags with arg's index */
void toggleview(const char *arg); /* toggles the tag with arg's index (in)visible */
void view(const char *arg); /* views the tag with arg's index */
/* util.c */
void *emallocz(unsigned int size); /* allocates zero-initialized memory, exits on error */
void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
void spawn(const char *arg); /* forks a new subprocess with arg's cmd */