[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;
	int h;
	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;
	Drawable pixmap;
	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 freewindow(struct Menu *menu);
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 (*label == '\0') {
		item->label = NULL;
		item->output = NULL;
	} else {
		if ((item->label = strdup(label)) == NULL)
			err(1, "strdup");
		if ((item->output = strdup(output)) == NULL)
			err(1, "strdup");
	}
	item->y = 0;
	item->h = item->label ? geom.itemh : geom.separator;
	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 | LeaveWindowMask;
	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;
	XSizeHints sizeh;
	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 == NULL)   /* 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);

	/* set window manager size hints */
	sizeh.flags = PMaxSize | PMinSize;
	sizeh.min_width = sizeh.max_width = menu->w;
	sizeh.min_height = sizeh.max_height = menu->h;
	XSetWMNormalHints(dpy, menu->win, &sizeh);

	/* create pixmap */
	menu->pixmap = XCreatePixmap(dpy, menu->win, menu->w, menu->h,
	                             DefaultDepth(dpy, screen));

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

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

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

			/* continue if item is a separator */
			if (item->label == NULL)
				continue;

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

			/* draw triangle, if item contains a submenu */
			if (item->submenu != NULL) {
				int trianglex = geom.itemw - dc.fonth + geom.itemb - 1;
				int triangley = item->y + (3 * item->h)/8 -1;

				XPoint triangle[] = {
					{trianglex, triangley},
					{trianglex + item->h/8 + 1, item->y + item->h/2},
					{trianglex, triangley + item->h/4 + 2},
					{trianglex, triangley}
				};

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

			XCopyArea(dpy, menu->pixmap, menu->win, dc.gc, 0, item->y,
			          menu->w, item->h, 0, item->y);
		}
	}
}

/* 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->label == NULL)
					break;  /* ignore separators */
				if (item->submenu != NULL) {
					setcurrmenu(item->submenu);
				} else {
					printf("%s\n", item->output);
					cleanupexit();
				}
				drawmenu();
			} else {
				cleanupexit();
			}
			break;
		case LeaveNotify:
			currmenu->selected = NULL;
			drawmenu();
			break;
		}
	}
}

/* recursivelly free a pixmap */
static void
freewindow(struct Menu *menu)
{
	struct Item *item;

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

	XFreePixmap(dpy, menu->pixmap);
	XDestroyWindow(dpy, menu->win);
}

/* cleanup and exit */
static void
cleanupexit(void)
{
	freewindow(rootmenu);
	XFreeFont(dpy, dc.font);
	XFreeGC(dpy, dc.gc);
	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;
7fbd1c5e	46	int y;
7fbd1c5e	47	int h;
a7732690	48	struct Item *next;
	49	struct Menu *submenu;
	50	};
	51
	52	/* menu structure */
	53	struct Menu {
	54	struct Menu *parent;
	55	struct Item *list;
	56	struct Item *selected;
	57	int x, y, w, h;
	58	unsigned level;
f15fc339	59	Drawable pixmap;
a7732690	60	Window win;
	61	};
	62
	63	/* function declarations */
	64	static unsigned long getcolor(const char *s);
	65	static void setupdc(void);
	66	static void setupgeom(void);
	67	static void setupgrab(void);
a80fee22	68	static struct Item allocitem(const char label, const char *output);
a7732690	69	static struct Menu allocmenu(struct Menu parent, struct Item *list, unsigned level);
f15fc339	70	static void getmenuitem(Window win, int y, struct Menu menu_ret, struct Item item_ret);
a7732690	71	static void drawmenu(void);
	72	static void calcscreengeom(void);
	73	static void calcmenu(struct Menu *menu);
	74	static void setcurrmenu(struct Menu *currmenu_new);
	75	static void parsestdin(void);
	76	static void run(void);
f15fc339	77	static void freewindow(struct Menu *menu);
a7732690	78	static void cleanupexit(void);
	79	static void usage(void);
	80
	81	/* X variables */
	82	static Colormap colormap;
	83	static Display *dpy;
	84	static Window rootwin;
	85	static int screen;
	86	static struct DC dc;
	87
	88	/* menu variables */
	89	static struct Menu *rootmenu = NULL;
	90	static struct Menu *currmenu = NULL;
	91
	92	/* geometry variables */
	93	static struct Geometry geom;
a80fee22	94	static struct ScreenGeometry screengeom;
a7732690	95
	96	/* flag variables */
	97	static Bool override_redirect = True;
	98
	99	#include "config.h"
	100
	101	int
	102	main(int argc, char *argv[])
	103	{
	104	int ch;
	105
	106	while ((ch = getopt(argc, argv, "w")) != -1) {
	107	switch (ch) {
	108	case 'w':
	109	override_redirect = False;
	110	break;
	111	default:
	112	usage();
	113	break;
	114	}
	115	}
	116	argc -= optind;
	117	argv += optind;
	118
	119	/* open connection to server and set X variables */
	120	if ((dpy = XOpenDisplay(NULL)) == NULL)
	121	errx(1, "cannot open display");
	122	screen = DefaultScreen(dpy);
	123	rootwin = RootWindow(dpy, screen);
	124	colormap = DefaultColormap(dpy, screen);
	125
	126	/* setup */
	127	setupdc();
	128	setupgeom();
	129	setupgrab();
	130
	131	/* generate menus and recalculate them */
	132	parsestdin();
	133	if (rootmenu == NULL)
	134	errx(1, "no menu generated");
	135	calcscreengeom();
	136	calcmenu(rootmenu);
	137
	138	/* run event loop */
	139	run();
	140
	141	return 1; /* UNREACHABLE */
	142	}
	143
	144	/* get color from color string */
	145	static unsigned long
	146	getcolor(const char *s)
	147	{
	148	XColor color;
	149
	150	if(!XAllocNamedColor(dpy, colormap, s, &color, &color))
	151	errx(1, "cannot allocate color: %s", s);
	152	return color.pixel;
	153	}
	154
	155	/* init draw context */
	156	static void
	157	setupdc(void)
	158	{
159	/* get color pixels */
160	dc.unpressed[ColorBG] = getcolor(UNPRESSEDBG);
161	dc.unpressed[ColorFG] = getcolor(UNPRESSEDFG);
162	dc.pressed[ColorBG] = getcolor(PRESSEDBG);
163	dc.pressed[ColorFG] = getcolor(PRESSEDFG);
164	dc.decoration[ColorBG] = getcolor(DECORATIONBG);
165	dc.decoration[ColorFG] = getcolor(DECORATIONFG);
166
167	/* try to get font */
168	if ((dc.font = XLoadQueryFont(dpy, FONT)) == NULL)
169	errx(1, "cannot load font");
170	dc.fonth = dc.font->ascent + dc.font->descent;
171
172	/* create GC and set its font */
173	dc.gc = XCreateGC(dpy, rootwin, 0, NULL);
174	XSetFont(dpy, dc.gc, dc.font->fid);
175	}
176
177	/* init menu geometry values */
178	static void
179	setupgeom(void)
180	{
181	geom.itemb = ITEMB;
182	geom.itemh = dc.fonth + ITEMB * 2;
183	geom.itemw = ITEMW;
184	geom.border = BORDER;
a80fee22	185	geom.separator = SEPARATOR;
a7732690	186	}
	187
	188	/* grab pointer */
	189	static void
	190	setupgrab(void)
	191	{
	192	XGrabPointer(dpy, rootwin, True, ButtonPressMask \| ButtonReleaseMask,
	193	GrabModeAsync, GrabModeAsync, None, None, CurrentTime);
	194	}
	195
	196	/* allocate an item */
	197	static struct Item *
a80fee22	198	allocitem(const char label, const char output)
a7732690	199	{
	200	struct Item *item;
	201
	202	if ((item = malloc(sizeof *item)) == NULL)
	203	err(1, "malloc");
7fbd1c5e	204	if (*label == '\0') {
	205	item->label = NULL;
	206	item->output = NULL;
	207	} else {
	208	if ((item->label = strdup(label)) == NULL)
	209	err(1, "strdup");
	210	if ((item->output = strdup(output)) == NULL)
	211	err(1, "strdup");
	212	}
a80fee22	213	item->y = 0;
7fbd1c5e	214	item->h = item->label ? geom.itemh : geom.separator;
a7732690	215	item->next = NULL;
	216	item->submenu = NULL;
	217
	218	return item;
	219	}
	220
	221	/* allocate a menu */
	222	static struct Menu *
	223	allocmenu(struct Menu parent, struct Item list, unsigned level)
	224	{
	225	XSetWindowAttributes swa;
	226	struct Menu *menu;
	227
	228	if ((menu = malloc(sizeof *menu)) == NULL)
	229	err(1, "malloc");
	230	menu->parent = parent;
	231	menu->list = list;
	232	menu->selected = NULL;
a7732690	233	menu->w = geom.itemw;
a80fee22	234	menu->h = 0; /* calculated by calcmenu() */
	235	menu->x = 0; /* calculated by calcmenu() */
	236	menu->y = 0; /* calculated by calcmenu() */
a7732690	237	menu->level = level;
a7732690	238
	239	swa.override_redirect = override_redirect;
	240	swa.background_pixel = dc.decoration[ColorBG];
	241	swa.border_pixel = dc.decoration[ColorFG];
	242	swa.event_mask = ExposureMask \| KeyPressMask \| ButtonPressMask \| ButtonReleaseMask
f15fc339	243	\| PointerMotionMask \| LeaveWindowMask;
a7732690	244	menu->win = XCreateWindow(dpy, rootwin, 0, 0, geom.itemw, geom.itemh, geom.border,
	245	CopyFromParent, CopyFromParent, CopyFromParent,
	246	CWOverrideRedirect \| CWBackPixel \| CWBorderPixel \| CWEventMask,
	247	&swa);
	248
	249	return menu;
	250	}
	251
	252	/* create menus and items from the stdin */
	253	static void
	254	parsestdin(void)
	255	{
	256	char *s, buf[BUFSIZ];
	257	char label, output;
	258	unsigned level = 0;
	259	unsigned i;
a80fee22	260	struct Item curritem = NULL; / item currently being read */
	261	struct Menu prevmenu = NULL; / menu the previous item was added to */
	262	struct Item item; / dummy item for for loops */
	263	struct Menu menu; / dummy menu for for loops */
a7732690	264	size_t count = 0; /* number of items in the current menu */
	265
	266	while (fgets(buf, BUFSIZ, stdin) != NULL) {
	267	level = 0;
	268	s = buf;
	269
	270	while (*s == '\t') {
	271	level++;
	272	s++;
	273	}
	274
	275	label = output = s;
	276
	277	while (s != '\0' && s != '\t' && *s != '\n')
	278	s++;
	279
	280	while (*s == '\t')
	281	*s++ = '\0';
	282
	283	if (s != '\0' && s != '\n')
	284	output = s;
	285
	286	while (s != '\0' && s != '\n')
	287	s++;
	288
	289	if (*s == '\n')
	290	*s = '\0';
	291
a80fee22	292	curritem = allocitem(label, output);
a7732690	293
a7732690	294	if (prevmenu == NULL) { /* there is no menu yet */
a80fee22	295	menu = allocmenu(NULL, curritem, level);
a7732690	296	rootmenu = menu;
	297	prevmenu = menu;
	298	count = 1;
	299	} else if (level < prevmenu->level) { /* item is continuation of a parent menu*/
	300	for (menu = prevmenu, i = level;
	301	menu != NULL && i < prevmenu->level;
	302	menu = menu->parent, i++)
	303	;
	304
	305	if (menu == NULL)
	306	errx(1, "reached NULL menu");
	307
a80fee22	308	for (item = menu->list; item->next != NULL; item = item->next)
a7732690	309	;
a7732690	310
a80fee22	311	item->next = curritem;
a7732690	312	prevmenu = menu;
a7732690	313	} else if (level == prevmenu->level) { /* item is a continuation of current menu */
a80fee22	314	for (item = prevmenu->list; item->next != NULL; item = item->next)
a7732690	315	;
a80fee22	316	item->next = curritem;
a7732690	317	} else if (level > prevmenu->level) { /* item begins a new menu */
a80fee22	318	menu = allocmenu(prevmenu, curritem, level);
a7732690	319
a80fee22	320	for (item = prevmenu->list; item->next != NULL; item = item->next)
a7732690	321	;
a7732690	322
a80fee22	323	item->submenu = menu;
a7732690	324
	325	prevmenu = menu;
	326	}
a80fee22	327	count++;
a7732690	328	}
	329	}
	330
	331	/* calculate screen geometry */
	332	static void
	333	calcscreengeom(void)
	334	{
	335	Window w1, w2; /* unused variables */
	336	int a, b; /* unused variables */
	337	unsigned mask; /* unused variable */
	338
a80fee22	339	XQueryPointer(dpy, rootwin, &w1, &w2, &screengeom.cursx, &screengeom.cursy, &a, &b, &mask);
	340	screengeom.screenw = DisplayWidth(dpy, screen);
	341	screengeom.screenh = DisplayHeight(dpy, screen);
a7732690	342	}
	343
	344	/* recursivelly calculate height and position of the menus */
	345	static void
	346	calcmenu(struct Menu *menu)
	347	{
	348	XWindowChanges changes;
09c13122	349	XSizeHints sizeh;
a80fee22	350	struct Item *item;
a7732690	351
a80fee22	352	/* calculate items positions and menu height */
	353	for (item = menu->list; item != NULL; item = item->next) {
	354	item->y = menu->h;
7fbd1c5e	355	if (item->label == NULL) /* height for separator item */
a80fee22	356	menu->h += geom.separator;
	357	else
	358	menu->h += geom.itemh;
	359	}
a7732690	360
	361	/* calculate menu's x and y positions */
	362	if (menu->parent == NULL) { /* if root menu, calculate in respect to cursor */
a80fee22	363	if (screengeom.screenw - screengeom.cursx >= menu->w)
	364	menu->x = screengeom.cursx;
	365	else if (screengeom.cursx > menu->w)
	366	menu->x = screengeom.cursx - menu->w;
	367
	368	if (screengeom.screenh - screengeom.cursy >= menu->h)
	369	menu->y = screengeom.cursy;
	370	else if (screengeom.screenh > menu->h)
	371	menu->y = screengeom.screenh - menu->h;
a7732690	372	} else { /* else, calculate in respect to parent menu */
	373
	374	/* search for the item in parent menu that generates this menu */
a80fee22	375	for (item = menu->parent->list; item->submenu != menu; item = item->next)
a7732690	376	;
a7732690	377
a80fee22	378	if (screengeom.screenw - (menu->parent->x + menu->parent->w) >= menu->w)
a7732690	379	menu->x = menu->parent->x + menu->parent->w;
	380	else if (menu->parent->x > menu->w)
	381	menu->x = menu->parent->x - menu->w;
	382
a80fee22	383	if (screengeom.screenh - (item->y + menu->parent->y) > menu->h)
	384	menu->y = item->y + menu->parent->y;
	385	else if (screengeom.screenh - menu->parent->y > menu->h)
a7732690	386	menu->y = menu->parent->y;
a80fee22	387	else if (screengeom.screenh > menu->h)
a80fee22	388	menu->y = screengeom.screenh - menu->h;
a7732690	389	}
	390
	391	/* update menu geometry */
	392	changes.height = menu->h;
	393	changes.x = menu->x;
	394	changes.y = menu->y;
	395	XConfigureWindow(dpy, menu->win, CWHeight \| CWX \| CWY, &changes);
	396
09c13122	397	/* set window manager size hints */
	398	sizeh.flags = PMaxSize \| PMinSize;
	399	sizeh.min_width = sizeh.max_width = menu->w;
	400	sizeh.min_height = sizeh.max_height = menu->h;
	401	XSetWMNormalHints(dpy, menu->win, &sizeh);
	402
f15fc339	403	/* create pixmap */
	404	menu->pixmap = XCreatePixmap(dpy, menu->win, menu->w, menu->h,
	405	DefaultDepth(dpy, screen));
	406
a80fee22	407	/* calculate positions of submenus */
a7732690	408	for (item = menu->list; item != NULL; item = item->next) {
	409	if (item->submenu != NULL)
	410	calcmenu(item->submenu);
	411	}
	412	}
	413
	414	/* get menu and item of given window and position */
	415	static void
a80fee22	416	getmenuitem(Window win, int y,
a7732690	417	struct Menu menu_ret, struct Item item_ret)
	418	{
	419	struct Menu *menu = NULL;
	420	struct Item *item = NULL;
	421
	422	for (menu = currmenu; menu != NULL; menu = menu->parent) {
	423	if (menu->win == win) {
	424	for (item = menu->list; item != NULL; item = item->next) {
7fbd1c5e	425	if (y >= item->y && y <= item->y + item->h) {
a7732690	426	goto done;
	427	}
	428	}
	429	}
	430	}
	431
	432
	433	done:
	434	*menu_ret = menu;
	435	*item_ret = item;
	436	}
	437
	438	/* set currentmenu to menu, umap previous menus and map current menu and its parents */
	439	static void
	440	setcurrmenu(struct Menu *currmenu_new)
	441	{
	442	struct Menu *menu;
	443
	444	if (currmenu_new == currmenu)
	445	return;
	446
	447	for (menu = currmenu; menu != NULL; menu = menu->parent) {
	448	XUnmapWindow(dpy, menu->win);
	449	}
	450
	451	currmenu = currmenu_new;
	452
	453	for (menu = currmenu; menu != NULL; menu = menu->parent)
	454	XMapWindow(dpy, menu->win);
	455	}
	456
	457	/* draw items of the current menu and of its ancestors */
	458	static void
	459	drawmenu(void)
	460	{
	461	struct Menu *menu;
	462	struct Item *item;
	463
	464	for (menu = currmenu; menu != NULL; menu = menu->parent) {
a7732690	465	for (item = menu->list; item != NULL; item = item->next) {
	466	unsigned long *color;
	467	size_t labellen;
	468	int labelx, labely;
a7732690	469
a7732690	470	/* determine item color */
7fbd1c5e	471	if (item->label == NULL)
	472	color = dc.decoration;
	473	else if (item == menu->selected)
a7732690	474	color = dc.pressed;
	475	else
	476	color = dc.unpressed;
	477
a7732690	478	/* draw item box */
a7732690	479	XSetForeground(dpy, dc.gc, color[ColorBG]);
f15fc339	480	XFillRectangle(dpy, menu->pixmap, dc.gc, 0, item->y,
7fbd1c5e	481	geom.itemw, item->h);
	482
	483	/* continue if item is a separator */
	484	if (item->label == NULL)
	485	continue;
a7732690	486
	487	/* draw item label */
	488	labellen = strlen(item->label);
	489	labelx = 0 + dc.fonth;
7fbd1c5e	490	labely = item->y + dc.fonth + geom.itemb;
a7732690	491	XSetForeground(dpy, dc.gc, color[ColorFG]);
f15fc339	492	XDrawString(dpy, menu->pixmap, dc.gc, labelx, labely, item->label, labellen);
a7732690	493
	494	/* draw triangle, if item contains a submenu */
	495	if (item->submenu != NULL) {
2b6968f9	496	int trianglex = geom.itemw - dc.fonth + geom.itemb - 1;
2b6968f9	497	int triangley = item->y + (3 * item->h)/8 -1;
a7732690	498
	499	XPoint triangle[] = {
	500	{trianglex, triangley},
2b6968f9	501	{trianglex + item->h/8 + 1, item->y + item->h/2},
2b6968f9	502	{trianglex, triangley + item->h/4 + 2},
a7732690	503	{trianglex, triangley}
	504	};
	505
f15fc339	506	XFillPolygon(dpy, menu->pixmap, dc.gc, triangle, LEN(triangle),
a7732690	507	Convex, CoordModeOrigin);
a7732690	508	}
f15fc339	509
	510	XCopyArea(dpy, menu->pixmap, menu->win, dc.gc, 0, item->y,
	511	menu->w, item->h, 0, item->y);
a7732690	512	}
	513	}
	514	}
	515
	516	/* run event loop */
	517	static void
	518	run(void)
	519	{
	520	struct Menu *menu;
	521	struct Item *item;
	522	struct Item *previtem = NULL;
	523	XEvent ev;
	524
	525	setcurrmenu(rootmenu);
	526
	527	while (!XNextEvent(dpy, &ev)) {
	528	switch(ev.type) {
	529	case Expose:
	530	drawmenu();
	531	break;
	532	case MotionNotify:
a80fee22	533	getmenuitem(ev.xbutton.window, ev.xbutton.y, &menu, &item);
a7732690	534	if (menu != NULL && item != NULL) {
	535	if (previtem != item) {
	536	if (item->submenu != NULL)
	537	setcurrmenu(item->submenu);
	538	else
	539	setcurrmenu(menu);
	540	previtem = item;
	541	} else if (menu->selected != item)
	542	menu->selected = item;
f15fc339	543	drawmenu();
a7732690	544	}
a7732690	545	break;
a7732690	546	case ButtonRelease:
a80fee22	547	getmenuitem(ev.xbutton.window, ev.xbutton.y, &menu, &item);
a7732690	548	if (menu != NULL && item != NULL) {
7fbd1c5e	549	if (item->label == NULL)
7fbd1c5e	550	break; /* ignore separators */
a7732690	551	if (item->submenu != NULL) {
	552	setcurrmenu(item->submenu);
	553	} else {
	554	printf("%s\n", item->output);
	555	cleanupexit();
	556	}
	557	drawmenu();
	558	} else {
	559	cleanupexit();
	560	}
	561	break;
f15fc339	562	case LeaveNotify:
	563	currmenu->selected = NULL;
	564	drawmenu();
	565	break;
a7732690	566	}
	567	}
	568	}
	569
f15fc339	570	/* recursivelly free a pixmap */
	571	static void
	572	freewindow(struct Menu *menu)
	573	{
	574	struct Item *item;
	575
	576	for (item = menu->list; item != NULL; item = item->next)
	577	if (item->submenu != NULL)
	578	freewindow(item->submenu);
	579
	580	XFreePixmap(dpy, menu->pixmap);
	581	XDestroyWindow(dpy, menu->win);
	582	}
	583
a7732690	584	/* cleanup and exit */
	585	static void
	586	cleanupexit(void)
	587	{
f15fc339	588	freewindow(rootmenu);
	589	XFreeFont(dpy, dc.font);
	590	XFreeGC(dpy, dc.gc);
a7732690	591	XCloseDisplay(dpy);
	592	exit(0);
	593	}
	594
	595	/* show usage */
	596	static void
	597	usage(void)
	598	{
	599	(void)fprintf(stderr, "usage: xmenu [-w] menuname\n");
	600	exit(1);
	601	}