[xmenu] / xmenu.c

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

/* macros */
#define LEN(x) (sizeof (x) / sizeof (x[0]))

/* color enum */
enum {ColorFG, ColorBG, ColorLast};

/* draw context structure */
struct DC {
	unsigned long unpressed[ColorLast];
	unsigned long pressed[ColorLast];
	unsigned long decoration[ColorLast];

	Drawable d;
	GC gc;
	XFontStruct *font;
	int fonth;
};

/* menu geometry structure */
struct Geometry {
	int itemb;      /* item border */
	int itemw;      /* item width */
	int itemh;      /* item height */
	int border;     /* window border width */
	int separator;  /* menu separator width */
};

/* screen geometry structure */
struct ScreenGeometry {
	int cursx, cursy;       /* cursor position */
	int screenw, screenh;   /* screen width and height */
};

/* menu item structure */
struct Item {
	char *label;
	char *output;
	int y;      /* only y is necessary, item's x is always 0 relative to the menu*/
	struct Item *next;
	struct Menu *submenu;
};

/* menu structure */
struct Menu {
	struct Menu *parent;
	struct Item *list;
	struct Item *selected;
	int x, y, w, h;
	unsigned level;
	Window win;
};

/* function declarations */
static unsigned long getcolor(const char *s);
static void setupdc(void);
static void setupgeom(void);
static void setupgrab(void);
static struct Item *allocitem(const char *label, const char *output);
static struct Menu *allocmenu(struct Menu *parent, struct Item *list, unsigned level);
static void getmenuitem(Window win, int y,
                        struct Menu **menu_ret, struct Item **item_ret);
static void drawmenu(void);
static void calcscreengeom(void);
static void calcmenu(struct Menu *menu);
static void setcurrmenu(struct Menu *currmenu_new);
static void parsestdin(void);
static void run(void);
static void cleanupexit(void);
static void usage(void);

/* X variables */
static Colormap colormap;
static Display *dpy;
static Window rootwin;
static int screen;
static struct DC dc;

/* menu variables */
static struct Menu *rootmenu = NULL;
static struct Menu *currmenu = NULL;

/* geometry variables */
static struct Geometry geom;
static struct ScreenGeometry screengeom;

/* flag variables */
static Bool override_redirect = True;

#include "config.h"

int
main(int argc, char *argv[])
{
	int ch;

	while ((ch = getopt(argc, argv, "w")) != -1) {
		switch (ch) {
		case 'w':
			override_redirect = False;
			break;
		default:
			usage();
			break;
		}
	}
	argc -= optind;
	argv += optind;

	/* open connection to server and set X variables */
	if ((dpy = XOpenDisplay(NULL)) == NULL)
		errx(1, "cannot open display");
	screen = DefaultScreen(dpy);
	rootwin = RootWindow(dpy, screen);
	colormap = DefaultColormap(dpy, screen);

	/* setup */
	setupdc();
	setupgeom();
	setupgrab();

	/* generate menus and recalculate them */
	parsestdin();
	if (rootmenu == NULL)
		errx(1, "no menu generated");
	calcscreengeom();
	calcmenu(rootmenu);

	/* run event loop */
	run();

	return 1;   /* UNREACHABLE */
}

/* get color from color string */
static unsigned long
getcolor(const char *s)
{
	XColor color;

	if(!XAllocNamedColor(dpy, colormap, s, &color, &color))
		errx(1, "cannot allocate color: %s", s);
	return color.pixel;
}

/* init draw context */
static void
setupdc(void)
{
	/* get color pixels */
	dc.unpressed[ColorBG] = getcolor(UNPRESSEDBG);
	dc.unpressed[ColorFG] = getcolor(UNPRESSEDFG);
	dc.pressed[ColorBG] = getcolor(PRESSEDBG);
	dc.pressed[ColorFG] = getcolor(PRESSEDFG);
	dc.decoration[ColorBG] = getcolor(DECORATIONBG);
	dc.decoration[ColorFG] = getcolor(DECORATIONFG);

	/* try to get font */
	if ((dc.font = XLoadQueryFont(dpy, FONT)) == NULL)
		errx(1, "cannot load font");
	dc.fonth = dc.font->ascent + dc.font->descent;

	/* create GC and set its font */
	dc.gc = XCreateGC(dpy, rootwin, 0, NULL);
	XSetFont(dpy, dc.gc, dc.font->fid);
}

/* init menu geometry values */
static void
setupgeom(void)
{
	geom.itemb = ITEMB;
	geom.itemh = dc.fonth + ITEMB * 2;
	geom.itemw = ITEMW;
	geom.border = BORDER;
	geom.separator = SEPARATOR;
}

/* grab pointer */
static void
setupgrab(void)
{
	XGrabPointer(dpy, rootwin, True, ButtonPressMask | ButtonReleaseMask,
	             GrabModeAsync, GrabModeAsync, None, None, CurrentTime);
}

/* allocate an item */
static struct Item *
allocitem(const char *label, const char *output)
{
	struct Item *item;

	if ((item = malloc(sizeof *item)) == NULL)
		err(1, "malloc");
	if ((item->label = strdup(label)) == NULL)
		err(1, "strdup");
	if ((item->output = strdup(output)) == NULL)
		err(1, "strdup");
	item->y = 0;
	item->next = NULL;
	item->submenu = NULL;

	return item;
}

/* allocate a menu */
static struct Menu *
allocmenu(struct Menu *parent, struct Item *list, unsigned level)
{
	XSetWindowAttributes swa;
	struct Menu *menu;

	if ((menu = malloc(sizeof *menu)) == NULL)
		err(1, "malloc");
	menu->parent = parent;
	menu->list = list;
	menu->selected = NULL;
	menu->w = geom.itemw;
	menu->h = 0;    /* calculated by calcmenu() */
	menu->x = 0;    /* calculated by calcmenu() */
	menu->y = 0;    /* calculated by calcmenu() */
	menu->level = level;

	swa.override_redirect = override_redirect;
	swa.background_pixel = dc.decoration[ColorBG];
	swa.border_pixel = dc.decoration[ColorFG];
	swa.event_mask = ExposureMask | KeyPressMask | ButtonPressMask | ButtonReleaseMask
	               | PointerMotionMask;
	menu->win = XCreateWindow(dpy, rootwin, 0, 0, geom.itemw, geom.itemh, geom.border,
	                          CopyFromParent, CopyFromParent, CopyFromParent,
	                          CWOverrideRedirect | CWBackPixel | CWBorderPixel | CWEventMask,
	                          &swa);

	return menu;
}

/* create menus and items from the stdin */
static void
parsestdin(void)
{
	char *s, buf[BUFSIZ];
	char *label, *output;
	unsigned level = 0;
	unsigned i;
	struct Item *curritem = NULL;   /* item currently being read */
 	struct Menu *prevmenu = NULL;   /* menu the previous item was added to */
	struct Item *item;              /* dummy item for for loops */
	struct Menu *menu;              /* dummy menu for for loops */
 	size_t count = 0;   /* number of items in the current menu */

	while (fgets(buf, BUFSIZ, stdin) != NULL) {
		level = 0;
		s = buf;

		while (*s == '\t') {
			level++;
			s++;
		}

		label = output = s;

		while (*s != '\0' && *s != '\t' && *s != '\n')
			s++;

		while (*s == '\t')
			*s++ = '\0';

		if (*s != '\0' && *s != '\n')
			output = s;

		while (*s != '\0' && *s != '\n')
			s++;

		if (*s == '\n')
			*s = '\0';

		curritem = allocitem(label, output);

		if (prevmenu == NULL) {                 /* there is no menu yet */
			 menu = allocmenu(NULL, curritem, level);
			 rootmenu = menu;
			 prevmenu = menu;
			 count = 1;
		} else if (level < prevmenu->level) {   /* item is continuation of a parent menu*/
			for (menu = prevmenu, i = level;
			      menu != NULL && i < prevmenu->level;
			      menu = menu->parent, i++)
				;

			if (menu == NULL)
				errx(1, "reached NULL menu");

			for (item = menu->list; item->next != NULL; item = item->next)
				;

			item->next = curritem;
			prevmenu = menu;
		} else if (level == prevmenu->level) {  /* item is a continuation of current menu */
			for (item = prevmenu->list; item->next != NULL; item = item->next)
				;
			item->next = curritem;
		} else if (level > prevmenu->level) {   /* item begins a new menu */
			menu = allocmenu(prevmenu, curritem, level);

			for (item = prevmenu->list; item->next != NULL; item = item->next)
				;

			item->submenu = menu;

			prevmenu = menu;
		}
		count++;
	}
}

/* calculate screen geometry */
static void
calcscreengeom(void)
{
	Window w1, w2;  /* unused variables */
	int a, b;       /* unused variables */
	unsigned mask;  /* unused variable */

	XQueryPointer(dpy, rootwin, &w1, &w2, &screengeom.cursx, &screengeom.cursy, &a, &b, &mask);
	screengeom.screenw = DisplayWidth(dpy, screen);
	screengeom.screenh = DisplayHeight(dpy, screen);
}

/* recursivelly calculate height and position of the menus */
static void
calcmenu(struct Menu *menu)
{
	XWindowChanges changes;
	struct Item *item;

	/* calculate items positions and menu height */
	for (item = menu->list; item != NULL; item = item->next) {
		item->y = menu->h;
		if (*item->label == '\0')   /* height for separator item */
			menu->h += geom.separator;
		else
			menu->h += geom.itemh;
	}

	/* calculate menu's x and y positions */
	if (menu->parent == NULL) { /* if root menu, calculate in respect to cursor */
		if (screengeom.screenw - screengeom.cursx >= menu->w)
			menu->x = screengeom.cursx;
		else if (screengeom.cursx > menu->w)
			menu->x = screengeom.cursx - menu->w;

		if (screengeom.screenh - screengeom.cursy >= menu->h)
			menu->y = screengeom.cursy;
		else if (screengeom.screenh > menu->h)
			menu->y = screengeom.screenh - menu->h;
	} else {                    /* else, calculate in respect to parent menu */

		/* search for the item in parent menu that generates this menu */
		for (item = menu->parent->list; item->submenu != menu; item = item->next)
			;

		if (screengeom.screenw - (menu->parent->x + menu->parent->w) >= menu->w)
			menu->x = menu->parent->x + menu->parent->w;
		else if (menu->parent->x > menu->w)
			menu->x = menu->parent->x - menu->w;

		if (screengeom.screenh - (item->y + menu->parent->y) > menu->h)
			menu->y = item->y + menu->parent->y;
		else if (screengeom.screenh - menu->parent->y > menu->h)
			menu->y = menu->parent->y;
		else if (screengeom.screenh > menu->h)
			menu->y = screengeom.screenh - menu->h;
	}

	/* update menu geometry */
	changes.height = menu->h;
	changes.x = menu->x;
	changes.y = menu->y;
	XConfigureWindow(dpy, menu->win, CWHeight | CWX | CWY, &changes);

	/* calculate positions of submenus */
	for (item = menu->list; item != NULL; item = item->next) {
		if (item->submenu != NULL)
			calcmenu(item->submenu);
	}
}

/* get menu and item of given window and position */
static void
getmenuitem(Window win, int y,
            struct Menu **menu_ret, struct Item **item_ret)
{
	struct Menu *menu = NULL;
	struct Item *item = NULL;

	for (menu = currmenu; menu != NULL; menu = menu->parent) {
		if (menu->win == win) {
			for (item = menu->list; item != NULL; item = item->next) {
				if (y >= item->y && y <= item->y + geom.itemh) {
					goto done;
				}
			}
		}
	}


done:
	*menu_ret = menu;
	*item_ret = item;
}

/* set currentmenu to menu, umap previous menus and map current menu and its parents */
static void
setcurrmenu(struct Menu *currmenu_new)
{
	struct Menu *menu;

	if (currmenu_new == currmenu)
		return;

	for (menu = currmenu; menu != NULL; menu = menu->parent) {
		XUnmapWindow(dpy, menu->win);
	}

	currmenu = currmenu_new;

	for (menu = currmenu; menu != NULL; menu = menu->parent)
		XMapWindow(dpy, menu->win);
}

/* draw items of the current menu and of its ancestors */
static void
drawmenu(void)
{
	struct Menu *menu;
	struct Item *item;

	for (menu = currmenu; menu != NULL; menu = menu->parent) {
		size_t nitems;      /* number of items before current item */

		nitems = 0;
		for (item = menu->list; item != NULL; item = item->next) {
			unsigned long *color;
			size_t labellen;
			int labelx, labely;
			int y;

			/* determine item color */
			if (item == menu->selected)
				color = dc.pressed;
			else
				color = dc.unpressed;

			/* calculate item's y position */
			y = nitems * geom.itemh;

			/* draw item box */
			XSetForeground(dpy, dc.gc, color[ColorBG]);
			XFillRectangle(dpy, menu->win, dc.gc, 0, y,
			               geom.itemw, geom.itemh);

			/* draw item label */
			labellen = strlen(item->label);
			labelx = 0 + dc.fonth;
			labely = y + dc.fonth + geom.itemb;
			XSetForeground(dpy, dc.gc, color[ColorFG]);
			XDrawString(dpy, menu->win, dc.gc, labelx, labely, item->label, labellen);

			/* draw triangle, if item contains a submenu */
			if (item->submenu != NULL) {
				int trianglex = geom.itemw - (geom.itemb + dc.fonth);
				int triangley = y + geom.itemb;

				XPoint triangle[] = {
					{trianglex, triangley},
					{trianglex + dc.fonth, triangley + dc.fonth/2},
					{trianglex, triangley + dc.fonth},
					{trianglex, triangley}
				};

				XFillPolygon(dpy, menu->win, dc.gc, triangle, LEN(triangle),
				             Convex, CoordModeOrigin);
			}

			nitems++;
		}
	}
}

/* run event loop */
static void
run(void)
{
	struct Menu *menu;
	struct Item *item;
	struct Item *previtem = NULL;
	XEvent ev;

	setcurrmenu(rootmenu);

	while (!XNextEvent(dpy, &ev)) {
		switch(ev.type) {
		case Expose:
			drawmenu();
			break;
		case MotionNotify:
			getmenuitem(ev.xbutton.window, ev.xbutton.y, &menu, &item);
			if (menu != NULL && item != NULL) {
				if (previtem != item) {
					if (item->submenu != NULL)
						setcurrmenu(item->submenu);
					else
						setcurrmenu(menu);
					previtem = item;
				} else if (menu->selected != item)
					menu->selected = item;
			}
			drawmenu();
			break;
		case ButtonRelease:
			getmenuitem(ev.xbutton.window, ev.xbutton.y, &menu, &item);
			if (menu != NULL && item != NULL) {
				if (item->submenu != NULL) {
					setcurrmenu(item->submenu);
				} else {
					printf("%s\n", item->output);
					cleanupexit();
				}
				drawmenu();
			} else {
				cleanupexit();
			}
			break;
		}
	}
}

/* cleanup and exit */
static void
cleanupexit(void)
{
	XCloseDisplay(dpy);
	exit(0);
}

/* show usage */
static void
usage(void)
{
	(void)fprintf(stderr, "usage: xmenu [-w] menuname\n");
	exit(1);
}
Commit	Line	Data
a7732690	1	#include <err.h>
	2	#include <stdio.h>
	3	#include <stdlib.h>
	4	#include <string.h>
	5	#include <unistd.h>
	6	#include <X11/Xlib.h>
	7	#include <X11/Xutil.h>
	8
	9	/* macros */
	10	#define LEN(x) (sizeof (x) / sizeof (x[0]))
	11
	12	/* color enum */
	13	enum {ColorFG, ColorBG, ColorLast};
	14
	15	/* draw context structure */
	16	struct DC {
	17	unsigned long unpressed[ColorLast];
	18	unsigned long pressed[ColorLast];
	19	unsigned long decoration[ColorLast];
	20
	21	Drawable d;
	22	GC gc;
	23	XFontStruct *font;
	24	int fonth;
	25	};
	26
	27	/* menu geometry structure */
	28	struct Geometry {
	29	int itemb; /* item border */
	30	int itemw; /* item width */
	31	int itemh; /* item height */
a80fee22	32	int border; /* window border width */
a80fee22	33	int separator; /* menu separator width */
a7732690	34	};
	35
	36	/* screen geometry structure */
	37	struct ScreenGeometry {
	38	int cursx, cursy; /* cursor position */
	39	int screenw, screenh; /* screen width and height */
	40	};
	41
	42	/* menu item structure */
	43	struct Item {
	44	char *label;
	45	char *output;
a80fee22	46	int y; /* only y is necessary, item's x is always 0 relative to the menu*/
a7732690	47	struct Item *next;
	48	struct Menu *submenu;
	49	};
	50
	51	/* menu structure */
	52	struct Menu {
	53	struct Menu *parent;
	54	struct Item *list;
	55	struct Item *selected;
	56	int x, y, w, h;
	57	unsigned level;
a7732690	58	Window win;
	59	};
	60
	61	/* function declarations */
	62	static unsigned long getcolor(const char *s);
	63	static void setupdc(void);
	64	static void setupgeom(void);
	65	static void setupgrab(void);
a80fee22	66	static struct Item allocitem(const char label, const char *output);
a7732690	67	static struct Menu allocmenu(struct Menu parent, struct Item *list, unsigned level);
a80fee22	68	static void getmenuitem(Window win, int y,
a7732690	69	struct Menu menu_ret, struct Item item_ret);
	70	static void drawmenu(void);
	71	static void calcscreengeom(void);
	72	static void calcmenu(struct Menu *menu);
	73	static void setcurrmenu(struct Menu *currmenu_new);
	74	static void parsestdin(void);
	75	static void run(void);
	76	static void cleanupexit(void);
	77	static void usage(void);
	78
	79	/* X variables */
	80	static Colormap colormap;
	81	static Display *dpy;
	82	static Window rootwin;
	83	static int screen;
	84	static struct DC dc;
	85
	86	/* menu variables */
	87	static struct Menu *rootmenu = NULL;
	88	static struct Menu *currmenu = NULL;
	89
	90	/* geometry variables */
	91	static struct Geometry geom;
a80fee22	92	static struct ScreenGeometry screengeom;
a7732690	93
	94	/* flag variables */
	95	static Bool override_redirect = True;
	96
	97	#include "config.h"
	98
	99	int
	100	main(int argc, char *argv[])
	101	{
	102	int ch;
	103
	104	while ((ch = getopt(argc, argv, "w")) != -1) {
	105	switch (ch) {
	106	case 'w':
	107	override_redirect = False;
	108	break;
	109	default:
	110	usage();
	111	break;
	112	}
	113	}
	114	argc -= optind;
	115	argv += optind;
	116
	117	/* open connection to server and set X variables */
	118	if ((dpy = XOpenDisplay(NULL)) == NULL)
	119	errx(1, "cannot open display");
	120	screen = DefaultScreen(dpy);
	121	rootwin = RootWindow(dpy, screen);
	122	colormap = DefaultColormap(dpy, screen);
	123
	124	/* setup */
	125	setupdc();
	126	setupgeom();
	127	setupgrab();
	128
	129	/* generate menus and recalculate them */
	130	parsestdin();
	131	if (rootmenu == NULL)
	132	errx(1, "no menu generated");
	133	calcscreengeom();
	134	calcmenu(rootmenu);
	135
	136	/* run event loop */
	137	run();
	138
	139	return 1; /* UNREACHABLE */
	140	}
	141
	142	/* get color from color string */
	143	static unsigned long
	144	getcolor(const char *s)
	145	{
	146	XColor color;
	147
	148	if(!XAllocNamedColor(dpy, colormap, s, &color, &color))
	149	errx(1, "cannot allocate color: %s", s);
	150	return color.pixel;
	151	}
	152
	153	/* init draw context */
	154	static void
	155	setupdc(void)
	156	{
157	/* get color pixels */
158	dc.unpressed[ColorBG] = getcolor(UNPRESSEDBG);
159	dc.unpressed[ColorFG] = getcolor(UNPRESSEDFG);
160	dc.pressed[ColorBG] = getcolor(PRESSEDBG);
161	dc.pressed[ColorFG] = getcolor(PRESSEDFG);
162	dc.decoration[ColorBG] = getcolor(DECORATIONBG);
163	dc.decoration[ColorFG] = getcolor(DECORATIONFG);
164
165	/* try to get font */
166	if ((dc.font = XLoadQueryFont(dpy, FONT)) == NULL)
167	errx(1, "cannot load font");
168	dc.fonth = dc.font->ascent + dc.font->descent;
169
170	/* create GC and set its font */
171	dc.gc = XCreateGC(dpy, rootwin, 0, NULL);
172	XSetFont(dpy, dc.gc, dc.font->fid);
173	}
174
175	/* init menu geometry values */
176	static void
177	setupgeom(void)
178	{
179	geom.itemb = ITEMB;
180	geom.itemh = dc.fonth + ITEMB * 2;
181	geom.itemw = ITEMW;
182	geom.border = BORDER;
a80fee22	183	geom.separator = SEPARATOR;
a7732690	184	}
	185
	186	/* grab pointer */
	187	static void
	188	setupgrab(void)
	189	{
	190	XGrabPointer(dpy, rootwin, True, ButtonPressMask \| ButtonReleaseMask,
	191	GrabModeAsync, GrabModeAsync, None, None, CurrentTime);
	192	}
	193
	194	/* allocate an item */
	195	static struct Item *
a80fee22	196	allocitem(const char label, const char output)
a7732690	197	{
	198	struct Item *item;
	199
	200	if ((item = malloc(sizeof *item)) == NULL)
	201	err(1, "malloc");
	202	if ((item->label = strdup(label)) == NULL)
	203	err(1, "strdup");
	204	if ((item->output = strdup(output)) == NULL)
	205	err(1, "strdup");
a80fee22	206	item->y = 0;
a7732690	207	item->next = NULL;
	208	item->submenu = NULL;
	209
	210	return item;
	211	}
	212
	213	/* allocate a menu */
	214	static struct Menu *
	215	allocmenu(struct Menu parent, struct Item list, unsigned level)
	216	{
	217	XSetWindowAttributes swa;
	218	struct Menu *menu;
	219
	220	if ((menu = malloc(sizeof *menu)) == NULL)
	221	err(1, "malloc");
	222	menu->parent = parent;
	223	menu->list = list;
	224	menu->selected = NULL;
a7732690	225	menu->w = geom.itemw;
a80fee22	226	menu->h = 0; /* calculated by calcmenu() */
	227	menu->x = 0; /* calculated by calcmenu() */
	228	menu->y = 0; /* calculated by calcmenu() */
a7732690	229	menu->level = level;
a7732690	230
	231	swa.override_redirect = override_redirect;
	232	swa.background_pixel = dc.decoration[ColorBG];
	233	swa.border_pixel = dc.decoration[ColorFG];
	234	swa.event_mask = ExposureMask \| KeyPressMask \| ButtonPressMask \| ButtonReleaseMask
	235	\| PointerMotionMask;
	236	menu->win = XCreateWindow(dpy, rootwin, 0, 0, geom.itemw, geom.itemh, geom.border,
	237	CopyFromParent, CopyFromParent, CopyFromParent,
	238	CWOverrideRedirect \| CWBackPixel \| CWBorderPixel \| CWEventMask,
	239	&swa);
	240
	241	return menu;
	242	}
	243
	244	/* create menus and items from the stdin */
	245	static void
	246	parsestdin(void)
	247	{
	248	char *s, buf[BUFSIZ];
	249	char label, output;
	250	unsigned level = 0;
	251	unsigned i;
a80fee22	252	struct Item curritem = NULL; / item currently being read */
	253	struct Menu prevmenu = NULL; / menu the previous item was added to */
	254	struct Item item; / dummy item for for loops */
	255	struct Menu menu; / dummy menu for for loops */
a7732690	256	size_t count = 0; /* number of items in the current menu */
	257
	258	while (fgets(buf, BUFSIZ, stdin) != NULL) {
	259	level = 0;
	260	s = buf;
	261
	262	while (*s == '\t') {
	263	level++;
	264	s++;
	265	}
	266
	267	label = output = s;
	268
	269	while (s != '\0' && s != '\t' && *s != '\n')
	270	s++;
	271
	272	while (*s == '\t')
	273	*s++ = '\0';
	274
	275	if (s != '\0' && s != '\n')
	276	output = s;
	277
	278	while (s != '\0' && s != '\n')
	279	s++;
	280
	281	if (*s == '\n')
	282	*s = '\0';
	283
a80fee22	284	curritem = allocitem(label, output);
a7732690	285
a7732690	286	if (prevmenu == NULL) { /* there is no menu yet */
a80fee22	287	menu = allocmenu(NULL, curritem, level);
a7732690	288	rootmenu = menu;
	289	prevmenu = menu;
	290	count = 1;
	291	} else if (level < prevmenu->level) { /* item is continuation of a parent menu*/
	292	for (menu = prevmenu, i = level;
	293	menu != NULL && i < prevmenu->level;
	294	menu = menu->parent, i++)
	295	;
	296
	297	if (menu == NULL)
	298	errx(1, "reached NULL menu");
	299
a80fee22	300	for (item = menu->list; item->next != NULL; item = item->next)
a7732690	301	;
a7732690	302
a80fee22	303	item->next = curritem;
a7732690	304	prevmenu = menu;
a7732690	305	} else if (level == prevmenu->level) { /* item is a continuation of current menu */
a80fee22	306	for (item = prevmenu->list; item->next != NULL; item = item->next)
a7732690	307	;
a80fee22	308	item->next = curritem;
a7732690	309	} else if (level > prevmenu->level) { /* item begins a new menu */
a80fee22	310	menu = allocmenu(prevmenu, curritem, level);
a7732690	311
a80fee22	312	for (item = prevmenu->list; item->next != NULL; item = item->next)
a7732690	313	;
a7732690	314
a80fee22	315	item->submenu = menu;
a7732690	316
	317	prevmenu = menu;
	318	}
a80fee22	319	count++;
a7732690	320	}
	321	}
	322
	323	/* calculate screen geometry */
	324	static void
	325	calcscreengeom(void)
	326	{
	327	Window w1, w2; /* unused variables */
	328	int a, b; /* unused variables */
	329	unsigned mask; /* unused variable */
	330
a80fee22	331	XQueryPointer(dpy, rootwin, &w1, &w2, &screengeom.cursx, &screengeom.cursy, &a, &b, &mask);
	332	screengeom.screenw = DisplayWidth(dpy, screen);
	333	screengeom.screenh = DisplayHeight(dpy, screen);
a7732690	334	}
	335
	336	/* recursivelly calculate height and position of the menus */
	337	static void
	338	calcmenu(struct Menu *menu)
	339	{
	340	XWindowChanges changes;
a80fee22	341	struct Item *item;
a7732690	342
a80fee22	343	/* calculate items positions and menu height */
	344	for (item = menu->list; item != NULL; item = item->next) {
	345	item->y = menu->h;
	346	if (item->label == '\0') / height for separator item */
	347	menu->h += geom.separator;
	348	else
	349	menu->h += geom.itemh;
	350	}
a7732690	351
	352	/* calculate menu's x and y positions */
	353	if (menu->parent == NULL) { /* if root menu, calculate in respect to cursor */
a80fee22	354	if (screengeom.screenw - screengeom.cursx >= menu->w)
	355	menu->x = screengeom.cursx;
	356	else if (screengeom.cursx > menu->w)
	357	menu->x = screengeom.cursx - menu->w;
	358
	359	if (screengeom.screenh - screengeom.cursy >= menu->h)
	360	menu->y = screengeom.cursy;
	361	else if (screengeom.screenh > menu->h)
	362	menu->y = screengeom.screenh - menu->h;
a7732690	363	} else { /* else, calculate in respect to parent menu */
	364
	365	/* search for the item in parent menu that generates this menu */
a80fee22	366	for (item = menu->parent->list; item->submenu != menu; item = item->next)
a7732690	367	;
a7732690	368
a80fee22	369	if (screengeom.screenw - (menu->parent->x + menu->parent->w) >= menu->w)
a7732690	370	menu->x = menu->parent->x + menu->parent->w;
	371	else if (menu->parent->x > menu->w)
	372	menu->x = menu->parent->x - menu->w;
	373
a80fee22	374	if (screengeom.screenh - (item->y + menu->parent->y) > menu->h)
	375	menu->y = item->y + menu->parent->y;
	376	else if (screengeom.screenh - menu->parent->y > menu->h)
a7732690	377	menu->y = menu->parent->y;
a80fee22	378	else if (screengeom.screenh > menu->h)
a80fee22	379	menu->y = screengeom.screenh - menu->h;
a7732690	380	}
	381
	382	/* update menu geometry */
	383	changes.height = menu->h;
	384	changes.x = menu->x;
	385	changes.y = menu->y;
	386	XConfigureWindow(dpy, menu->win, CWHeight \| CWX \| CWY, &changes);
	387
a80fee22	388	/* calculate positions of submenus */
a7732690	389	for (item = menu->list; item != NULL; item = item->next) {
	390	if (item->submenu != NULL)
	391	calcmenu(item->submenu);
	392	}
	393	}
	394
	395	/* get menu and item of given window and position */
	396	static void
a80fee22	397	getmenuitem(Window win, int y,
a7732690	398	struct Menu menu_ret, struct Item item_ret)
	399	{
	400	struct Menu *menu = NULL;
	401	struct Item *item = NULL;
	402
	403	for (menu = currmenu; menu != NULL; menu = menu->parent) {
	404	if (menu->win == win) {
	405	for (item = menu->list; item != NULL; item = item->next) {
a80fee22	406	if (y >= item->y && y <= item->y + geom.itemh) {
a7732690	407	goto done;
	408	}
	409	}
	410	}
	411	}
	412
	413
	414	done:
	415	*menu_ret = menu;
	416	*item_ret = item;
	417	}
	418
	419	/* set currentmenu to menu, umap previous menus and map current menu and its parents */
	420	static void
	421	setcurrmenu(struct Menu *currmenu_new)
	422	{
	423	struct Menu *menu;
	424
	425	if (currmenu_new == currmenu)
	426	return;
	427
	428	for (menu = currmenu; menu != NULL; menu = menu->parent) {
	429	XUnmapWindow(dpy, menu->win);
	430	}
	431
	432	currmenu = currmenu_new;
	433
	434	for (menu = currmenu; menu != NULL; menu = menu->parent)
	435	XMapWindow(dpy, menu->win);
	436	}
	437
	438	/* draw items of the current menu and of its ancestors */
	439	static void
	440	drawmenu(void)
	441	{
	442	struct Menu *menu;
	443	struct Item *item;
	444
	445	for (menu = currmenu; menu != NULL; menu = menu->parent) {
	446	size_t nitems; /* number of items before current item */
	447
	448	nitems = 0;
	449	for (item = menu->list; item != NULL; item = item->next) {
	450	unsigned long *color;
	451	size_t labellen;
	452	int labelx, labely;
	453	int y;
	454
	455	/* determine item color */
	456	if (item == menu->selected)
	457	color = dc.pressed;
	458	else
	459	color = dc.unpressed;
	460
	461	/* calculate item's y position */
	462	y = nitems * geom.itemh;
	463
	464	/* draw item box */
	465	XSetForeground(dpy, dc.gc, color[ColorBG]);
	466	XFillRectangle(dpy, menu->win, dc.gc, 0, y,
	467	geom.itemw, geom.itemh);
	468
	469	/* draw item label */
	470	labellen = strlen(item->label);
471	labelx = 0 + dc.fonth;
472	labely = y + dc.fonth + geom.itemb;
473	XSetForeground(dpy, dc.gc, color[ColorFG]);
474	XDrawString(dpy, menu->win, dc.gc, labelx, labely, item->label, labellen);
475
476	/* draw triangle, if item contains a submenu */
477	if (item->submenu != NULL) {
478	int trianglex = geom.itemw - (geom.itemb + dc.fonth);
479	int triangley = y + geom.itemb;
480
481	XPoint triangle[] = {
482	{trianglex, triangley},
483	{trianglex + dc.fonth, triangley + dc.fonth/2},
484	{trianglex, triangley + dc.fonth},
485	{trianglex, triangley}
486	};
487
488	XFillPolygon(dpy, menu->win, dc.gc, triangle, LEN(triangle),
489	Convex, CoordModeOrigin);
490	}
491
492	nitems++;
493	}
494	}
495	}
496
497	/* run event loop */
498	static void
499	run(void)
500	{
501	struct Menu *menu;
502	struct Item *item;
503	struct Item *previtem = NULL;
504	XEvent ev;
505
506	setcurrmenu(rootmenu);
507
508	while (!XNextEvent(dpy, &ev)) {
509	switch(ev.type) {
510	case Expose:
511	drawmenu();
512	break;
513	case MotionNotify:
a80fee22	514	getmenuitem(ev.xbutton.window, ev.xbutton.y, &menu, &item);
a7732690	515	if (menu != NULL && item != NULL) {
	516	if (previtem != item) {
	517	if (item->submenu != NULL)
	518	setcurrmenu(item->submenu);
	519	else
	520	setcurrmenu(menu);
	521	previtem = item;
	522	} else if (menu->selected != item)
	523	menu->selected = item;
	524	}
	525	drawmenu();
	526	break;
	527	case ButtonRelease:
a80fee22	528	getmenuitem(ev.xbutton.window, ev.xbutton.y, &menu, &item);
a7732690	529	if (menu != NULL && item != NULL) {
	530	if (item->submenu != NULL) {
	531	setcurrmenu(item->submenu);
	532	} else {
	533	printf("%s\n", item->output);
	534	cleanupexit();
	535	}
	536	drawmenu();
	537	} else {
	538	cleanupexit();
	539	}
	540	break;
	541	}
	542	}
	543	}
	544
	545	/* cleanup and exit */
	546	static void
	547	cleanupexit(void)
	548	{
	549	XCloseDisplay(dpy);
	550	exit(0);
	551	}
	552
	553	/* show usage */
	554	static void
	555	usage(void)
	556	{
	557	(void)fprintf(stderr, "usage: xmenu [-w] menuname\n");
	558	exit(1);
	559	}