1/* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
  2 * See LICENSE file for license details.
  3 *
  4 * dynamic window manager is designed like any other X client as well. It is
  5 * driven through handling X events. In contrast to other X clients, a window
  6 * manager selects for SubstructureRedirectMask on the root window, to receive
  7 * events about window (dis-)appearance.  Only one X connection at a time is
  8 * allowed to select for this event mask.
  9 *
 10 * Calls to fetch an X event from the event queue are blocking.  Due reading
 11 * status text from standard input, a select()-driven main loop has been
 12 * implemented which selects for reads on the X connection and STDIN_FILENO to
 13 * handle all data smoothly. The event handlers of dwm are organized in an
 14 * array which is accessed whenever a new event has been fetched. This allows
 15 * event dispatching in O(1) time.
 16 *
 17 * Each child of the root window is called a client, except windows which have
 18 * set the override_redirect flag.  Clients are organized in a global
 19 * doubly-linked client list, the focus history is remembered through a global
 20 * stack list. Each client contains an array of Bools of the same size as the
 21 * global tags array to indicate the tags of a client.  For each client dwm
 22 * creates a small title window, which is resized whenever the (_NET_)WM_NAME
 23 * properties are updated or the client is moved/resized.
 24 *
 25 * Keys and tagging rules are organized as arrays and defined in the config.h
 26 * file. These arrays are kept static in event.o and tag.o respectively,
 27 * because no other part of dwm needs access to them.  The current layout is
 28 * represented by the lt pointer.
 29 *
 30 * To understand everything else, start reading main.c:main().
 31 */
 32
 33#include "config.h"
 34#include <X11/Xlib.h>
 35
 36/* mask shorthands, used in event.c and client.c */
 37#define BUTTONMASK		(ButtonPressMask | ButtonReleaseMask)
 38
 39enum { NetSupported, NetWMName, NetLast };		/* EWMH atoms */
 40enum { WMProtocols, WMDelete, WMState, WMLast };	/* default atoms */
 41enum { CurNormal, CurResize, CurMove, CurLast };	/* cursor */
 42enum { ColBorder, ColFG, ColBG, ColLast };		/* color */
 43
 44typedef struct {
 45	int ascent;
 46	int descent;
 47	int height;
 48	XFontSet set;
 49	XFontStruct *xfont;
 50} Fnt;
 51
 52typedef struct {
 53	int x, y, w, h;
 54	unsigned long norm[ColLast];
 55	unsigned long sel[ColLast];
 56	Drawable drawable;
 57	Fnt font;
 58	GC gc;
 59} DC; /* draw context */
 60
 61typedef struct Client Client;
 62struct Client {
 63	char name[256];
 64	int x, y, w, h;
 65	int rx, ry, rw, rh; /* revert geometry */
 66	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 67	int minax, minay, maxax, maxay;
 68	long flags; 
 69	unsigned int border;
 70	Bool isbanned, isfixed, ismax, isversatile;
 71	Bool *tags;
 72	Client *next;
 73	Client *prev;
 74	Client *snext;
 75	Window win;
 76};
 77
 78typedef struct {
 79	const char *symbol;
 80	void (*arrange)(void);
 81} Layout;
 82
 83extern const char *tags[];			/* all tags */
 84extern char stext[256];				/* status text */
 85extern int screen, sx, sy, sw, sh;		/* screen geometry */
 86extern int wax, way, wah, waw;			/* windowarea geometry */
 87extern unsigned int bh, blw;			/* bar height, bar layout label width */
 88extern unsigned int ntags, numlockmask;		/* number of tags, dynamic lock mask */
 89extern void (*handler[LASTEvent])(XEvent *);	/* event handler */
 90extern Atom wmatom[WMLast], netatom[NetLast];
 91extern Bool selscreen, *seltag;			/* seltag is array of Bool */
 92extern Client *clients, *sel, *stack;		/* global client list and stack */
 93extern Cursor cursor[CurLast];
 94extern DC dc;					/* global draw context */
 95extern Display *dpy;
 96extern Layout *lt;
 97extern Window root, barwin;
 98
 99/* client.c */
100extern void attach(Client *c);			/* attaches c to global client list */
101extern void configure(Client *c);		/* send synthetic configure event */
102extern void detach(Client *c);			/* detaches c from global client list */
103extern void focus(Client *c);			/* focus c, c may be NULL */
104extern void killclient(const char *arg);		/* kill c nicely */
105extern void manage(Window w, XWindowAttributes *wa);	/* manage new client */
106extern void resize(Client *c, int x, int y,
107		int w, int h, Bool sizehints);	/* resize with given coordinates c*/
108extern void toggleversatile(const char *arg);		/* toggles focused client between versatile/and non-versatile state */
109extern void updatesizehints(Client *c);		/* update the size hint variables of c */
110extern void updatetitle(Client *c);		/* update the name of c */
111extern void unmanage(Client *c);		/* destroy c */
112
113/* draw.c */
114extern void drawstatus(void);			/* draw the bar */
115extern void drawtext(const char *text,
116		unsigned long col[ColLast]);	/* draw text */
117extern unsigned int textw(const char *text);	/* return the width of text in px*/
118
119/* event.c */
120extern void grabkeys(void);			/* grab all keys defined in config.h */
121
122/* layout.c */
123extern void focusnext(const char *arg);		/* focuses next visible client, arg is ignored  */
124extern void focusprev(const char *arg);		/* focuses previous visible client, arg is ignored */
125extern void incmasterw(const char *arg);		/* increments the master width with arg's index value */
126extern void incnmaster(const char *arg);		/* increments nmaster with arg's index value */
127extern void initlayouts(void);			/* initialize layout array */
128extern Client *nexttiled(Client *c);		/* returns tiled successor of c */
129extern void restack(void);			/* restores z layers of all clients */
130extern void setlayout(const char *arg);		/* sets layout, -1 toggles */
131extern void togglemax(const char *arg);			/* toggles maximization of versatile client */
132extern void versatile(void);			/* arranges all windows versatile */
133
134/* main.c */
135extern void quit(const char *arg);			/* quit dwm nicely */
136extern void sendevent(Window w, Atom a, long value);	/* send synthetic event to w */
137extern int xerror(Display *dsply, XErrorEvent *ee);	/* dwm's X error handler */
138
139/* tag.c */
140extern void compileregs(void);			/* initialize regexps of rules defined in config.h */
141extern Bool isvisible(Client *c);		/* returns True if client is visible */
142extern void settags(Client *c, Client *trans);	/* sets tags of c */
143extern void tag(const char *arg);			/* tags c with arg's index */
144extern void toggletag(const char *arg);		/* toggles c tags with arg's index */
145extern void toggleview(const char *arg);		/* toggles the tag with arg's index (in)visible */
146extern void view(const char *arg);			/* views the tag with arg's index */
147extern void zoom(const char *arg);			/* zooms the focused client to master area, arg is ignored */
148
149/* util.c */
150extern void *emallocz(unsigned int size);	/* allocates zero-initialized memory, exits on error */
151extern void eprint(const char *errstr, ...);	/* prints errstr and exits with 1 */
152extern void spawn(const char *arg);			/* forks a new subprocess with arg's cmd */
153