nixos-dotfiles

/* See LICENSE file for copyright and license details. */

#include <ctype.h>

#include <locale.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <strings.h>

#include <time.h>

#include <unistd.h>

#include <X11/Xlib.h>

#include <X11/Xatom.h>

#include <X11/Xutil.h>

#ifdef XINERAMA

#include <X11/extensions/Xinerama.h>

#endif

#include <X11/Xft/Xft.h>

#include "drw.h"

#include "util.h"

/* macros */

#define INTERSECT(x,y,w,h,r)  (MAX(0, MIN((x)+(w),(r).x_org+(r).width)  - MAX((x),(r).x_org)) \

                             * MAX(0, MIN((y)+(h),(r).y_org+(r).height) - MAX((y),(r).y_org)))

#define TEXTW(X)              (drw_fontset_getwidth(drw, (X)) + lrpad)

/* enums */

enum { SchemeNorm, SchemeSel, SchemeOut, SchemeLast }; /* color schemes */

struct item {

	char *text;

	struct item *left, *right;

	int out;

};

static char text[BUFSIZ] = "";

static char *embed;

static int bh, mw, mh;

static int inputw = 0, promptw;

static int lrpad; /* sum of left and right padding */

static size_t cursor;

static struct item *items = NULL;

static struct item *matches, *matchend;

static struct item *prev, *curr, *next, *sel;

static int mon = -1, screen;

static Atom clip, utf8;

static Display *dpy;

static Window root, parentwin, win;

static XIC xic;

static Drw *drw;

static Clr *scheme[SchemeLast];

#include "config.h"

static int (*fstrncmp)(const char *, const char *, size_t) = strncmp;

static char *(*fstrstr)(const char *, const char *) = strstr;

static unsigned int

textw_clamp(const char *str, unsigned int n)

{

	unsigned int w = drw_fontset_getwidth_clamp(drw, str, n) + lrpad;

	return MIN(w, n);

}

static void

appenditem(struct item *item, struct item **list, struct item **last)

{

	if (*last)

		(*last)->right = item;

	else

		*list = item;

	item->left = *last;

	item->right = NULL;

	*last = item;

}

static void

calcoffsets(void)

{

	int i, n;

	if (lines > 0)

		n = lines * bh;

	else

		n = mw - (promptw + inputw + TEXTW("<") + TEXTW(">"));

	/* calculate which items will begin the next page and previous page */

	for (i = 0, next = curr; next; next = next->right)

		if ((i += (lines > 0) ? bh : textw_clamp(next->text, n)) > n)

			break;

	for (i = 0, prev = curr; prev && prev->left; prev = prev->left)

		if ((i += (lines > 0) ? bh : textw_clamp(prev->left->text, n)) > n)

			break;

}

static void

cleanup(void)

{

	size_t i;

	XUngrabKeyboard(dpy, CurrentTime);

	for (i = 0; i < SchemeLast; i++)

		free(scheme[i]);

	for (i = 0; items && items[i].text; ++i)

		free(items[i].text);

	free(items);

	drw_free(drw);

	XSync(dpy, False);

	XCloseDisplay(dpy);

}

static char *

cistrstr(const char *h, const char *n)

{

	size_t i;

	if (!n[0])

		return (char *)h;

	for (; *h; ++h) {

		for (i = 0; n[i] && tolower((unsigned char)n[i]) ==

		            tolower((unsigned char)h[i]); ++i)

			;

		if (n[i] == '\0')

			return (char *)h;

	}

	return NULL;

}

static int

drawitem(struct item *item, int x, int y, int w)

{

	if (item == sel)

		drw_setscheme(drw, scheme[SchemeSel]);

	else if (item->out)

		drw_setscheme(drw, scheme[SchemeOut]);

	else

		drw_setscheme(drw, scheme[SchemeNorm]);

	return drw_text(drw, x, y, w, bh, lrpad / 2, item->text, 0);

}

static void

drawmenu(void)

{

	unsigned int curpos;

	struct item *item;

	int x = 0, y = 0, w;

	drw_setscheme(drw, scheme[SchemeNorm]);

	drw_rect(drw, 0, 0, mw, mh, 1, 1);

	if (prompt && *prompt) {

		drw_setscheme(drw, scheme[SchemeSel]);

		x = drw_text(drw, x, 0, promptw, bh, lrpad / 2, prompt, 0);

	}

	/* draw input field */

	w = (lines > 0 || !matches) ? mw - x : inputw;

	drw_setscheme(drw, scheme[SchemeNorm]);

	drw_text(drw, x, 0, w, bh, lrpad / 2, text, 0);

	curpos = TEXTW(text) - TEXTW(&text[cursor]);

	if ((curpos += lrpad / 2 - 1) < w) {

		drw_setscheme(drw, scheme[SchemeNorm]);

		drw_rect(drw, x + curpos, 2, 2, bh - 4, 1, 0);

	}

	if (lines > 0) {

		/* draw vertical list */

		for (item = curr; item != next; item = item->right)

			drawitem(item, x, y += bh, mw - x);

	} else if (matches) {

		/* draw horizontal list */

		x += inputw;

		w = TEXTW("<");

		if (curr->left) {

			drw_setscheme(drw, scheme[SchemeNorm]);

			drw_text(drw, x, 0, w, bh, lrpad / 2, "<", 0);

		}

		x += w;

		for (item = curr; item != next; item = item->right)

			x = drawitem(item, x, 0, textw_clamp(item->text, mw - x - TEXTW(">")));

		if (next) {

			w = TEXTW(">");

			drw_setscheme(drw, scheme[SchemeNorm]);

			drw_text(drw, mw - w, 0, w, bh, lrpad / 2, ">", 0);

		}

	}

	drw_map(drw, win, 0, 0, mw, mh);

}

static void

grabfocus(void)

{

	struct timespec ts = { .tv_sec = 0, .tv_nsec = 10000000  };

	Window focuswin;

	int i, revertwin;

	for (i = 0; i < 100; ++i) {

		XGetInputFocus(dpy, &focuswin, &revertwin);

		if (focuswin == win)

			return;

		XSetInputFocus(dpy, win, RevertToParent, CurrentTime);

		nanosleep(&ts, NULL);

	}

	die("cannot grab focus");

}

static void

grabkeyboard(void)

{

	struct timespec ts = { .tv_sec = 0, .tv_nsec = 1000000  };

	int i;

	if (embed)

		return;

	/* try to grab keyboard, we may have to wait for another process to ungrab */

	for (i = 0; i < 1000; i++) {

		if (XGrabKeyboard(dpy, DefaultRootWindow(dpy), True, GrabModeAsync,

		                  GrabModeAsync, CurrentTime) == GrabSuccess)

			return;

		nanosleep(&ts, NULL);

	}

	die("cannot grab keyboard");

}

static void

match(void)

{

	static char **tokv = NULL;

	static int tokn = 0;

	char buf[sizeof text], *s;

	int i, tokc = 0;

	size_t len, textsize;

	struct item *item, *lprefix, *lsubstr, *prefixend, *substrend;

	strcpy(buf, text);

	/* separate input text into tokens to be matched individually */

	for (s = strtok(buf, " "); s; tokv[tokc - 1] = s, s = strtok(NULL, " "))

		if (++tokc > tokn && !(tokv = realloc(tokv, ++tokn * sizeof *tokv)))

			die("cannot realloc %zu bytes:", tokn * sizeof *tokv);

	len = tokc ? strlen(tokv[0]) : 0;

	matches = lprefix = lsubstr = matchend = prefixend = substrend = NULL;

	textsize = strlen(text) + 1;

	for (item = items; item && item->text; item++) {

		for (i = 0; i < tokc; i++)

			if (!fstrstr(item->text, tokv[i]))

				break;

		if (i != tokc) /* not all tokens match */

			continue;

		/* exact matches go first, then prefixes, then substrings */

		if (!tokc || !fstrncmp(text, item->text, textsize))

			appenditem(item, &matches, &matchend);

		else if (!fstrncmp(tokv[0], item->text, len))

			appenditem(item, &lprefix, &prefixend);

		else

			appenditem(item, &lsubstr, &substrend);

	}

	if (lprefix) {

		if (matches) {

			matchend->right = lprefix;

			lprefix->left = matchend;

		} else

			matches = lprefix;

		matchend = prefixend;

	}

	if (lsubstr) {

		if (matches) {

			matchend->right = lsubstr;

			lsubstr->left = matchend;

		} else

			matches = lsubstr;

		matchend = substrend;

	}

	curr = sel = matches;

	calcoffsets();

}

static void

insert(const char *str, ssize_t n)

{

	if (strlen(text) + n > sizeof text - 1)

		return;

	/* move existing text out of the way, insert new text, and update cursor */

	memmove(&text[cursor + n], &text[cursor], sizeof text - cursor - MAX(n, 0));

	if (n > 0)

		memcpy(&text[cursor], str, n);

	cursor += n;

	match();

}

static size_t

nextrune(int inc)

{

	ssize_t n;

	/* return location of next utf8 rune in the given direction (+1 or -1) */

	for (n = cursor + inc; n + inc >= 0 && (text[n] & 0xc0) == 0x80; n += inc)

		;

	return n;

}

static void

movewordedge(int dir)

{

	if (dir < 0) { /* move cursor to the start of the word*/

		while (cursor > 0 && strchr(worddelimiters, text[nextrune(-1)]))

			cursor = nextrune(-1);

		while (cursor > 0 && !strchr(worddelimiters, text[nextrune(-1)]))

			cursor = nextrune(-1);

	} else { /* move cursor to the end of the word */

		while (text[cursor] && strchr(worddelimiters, text[cursor]))

			cursor = nextrune(+1);

		while (text[cursor] && !strchr(worddelimiters, text[cursor]))

			cursor = nextrune(+1);

	}

}

static void

keypress(XKeyEvent *ev)

{

	char buf[64];

	int len;

	KeySym ksym = NoSymbol;

	Status status;

	len = XmbLookupString(xic, ev, buf, sizeof buf, &ksym, &status);

	switch (status) {

	default: /* XLookupNone, XBufferOverflow */

		return;

	case XLookupChars: /* composed string from input method */

		goto insert;

	case XLookupKeySym:

	case XLookupBoth: /* a KeySym and a string are returned: use keysym */

		break;

	}

	if (ev->state & ControlMask) {

		switch(ksym) {

		case XK_a: ksym = XK_Home;      break;

		case XK_b: ksym = XK_Left;      break;

		case XK_c: ksym = XK_Escape;    break;

		case XK_d: ksym = XK_Delete;    break;

		case XK_e: ksym = XK_End;       break;

		case XK_f: ksym = XK_Right;     break;

		case XK_g: ksym = XK_Escape;    break;

		case XK_h: ksym = XK_BackSpace; break;

		case XK_i: ksym = XK_Tab;       break;

		case XK_j: /* fallthrough */

		case XK_J: /* fallthrough */

		case XK_m: /* fallthrough */

		case XK_M: ksym = XK_Return; ev->state &= ~ControlMask; break;

		case XK_n: ksym = XK_Down;      break;

		case XK_p: ksym = XK_Up;        break;

		case XK_k: /* delete right */

			text[cursor] = '\0';

			match();

			break;

		case XK_u: /* delete left */

			insert(NULL, 0 - cursor);

			break;

		case XK_w: /* delete word */

			while (cursor > 0 && strchr(worddelimiters, text[nextrune(-1)]))

				insert(NULL, nextrune(-1) - cursor);

			while (cursor > 0 && !strchr(worddelimiters, text[nextrune(-1)]))

				insert(NULL, nextrune(-1) - cursor);

			break;

		case XK_y: /* paste selection */

		case XK_Y:

			XConvertSelection(dpy, (ev->state & ShiftMask) ? clip : XA_PRIMARY,

			                  utf8, utf8, win, CurrentTime);

			return;

		case XK_Left:

		case XK_KP_Left:

			movewordedge(-1);

			goto draw;

		case XK_Right:

		case XK_KP_Right:

			movewordedge(+1);

			goto draw;

		case XK_Return:

		case XK_KP_Enter:

			break;

		case XK_bracketleft:

			cleanup();

			exit(1);

		default:

			return;

		}

	} else if (ev->state & Mod1Mask) {

		switch(ksym) {

		case XK_b:

			movewordedge(-1);

			goto draw;

		case XK_f:

			movewordedge(+1);

			goto draw;

		case XK_g: ksym = XK_Home;  break;

		case XK_G: ksym = XK_End;   break;

		case XK_h: ksym = XK_Up;    break;

		case XK_j: ksym = XK_Next;  break;

		case XK_k: ksym = XK_Prior; break;

		case XK_l: ksym = XK_Down;  break;

		default:

			return;

		}

	}

	switch(ksym) {

	default:

insert:

		if (!iscntrl((unsigned char)*buf))

			insert(buf, len);

		break;

	case XK_Delete:

	case XK_KP_Delete:

		if (text[cursor] == '\0')

			return;

		cursor = nextrune(+1);

		/* fallthrough */

	case XK_BackSpace:

		if (cursor == 0)

			return;

		insert(NULL, nextrune(-1) - cursor);

		break;

	case XK_End:

	case XK_KP_End:

		if (text[cursor] != '\0') {

			cursor = strlen(text);

			break;

		}

		if (next) {

			/* jump to end of list and position items in reverse */

			curr = matchend;

			calcoffsets();

			curr = prev;

			calcoffsets();

			while (next && (curr = curr->right))

				calcoffsets();

		}

		sel = matchend;

		break;

	case XK_Escape:

		cleanup();

		exit(1);

	case XK_Home:

	case XK_KP_Home:

		if (sel == matches) {

			cursor = 0;

			break;

		}

		sel = curr = matches;

		calcoffsets();

		break;

	case XK_Left:

	case XK_KP_Left:

		if (cursor > 0 && (!sel || !sel->left || lines > 0)) {

			cursor = nextrune(-1);

			break;

		}

		if (lines > 0)

			return;

		/* fallthrough */

	case XK_Up:

	case XK_KP_Up:

		if (sel && sel->left && (sel = sel->left)->right == curr) {

			curr = prev;

			calcoffsets();

		}

		break;

	case XK_Next:

	case XK_KP_Next:

		if (!next)

			return;

		sel = curr = next;

		calcoffsets();

		break;

	case XK_Prior:

	case XK_KP_Prior:

		if (!prev)

			return;

		sel = curr = prev;

		calcoffsets();

		break;

	case XK_Return:

	case XK_KP_Enter:

		puts((sel && !(ev->state & ShiftMask)) ? sel->text : text);

		if (!(ev->state & ControlMask)) {

			cleanup();

			exit(0);

		}

		if (sel)

			sel->out = 1;

		break;

	case XK_Right:

	case XK_KP_Right:

		if (text[cursor] != '\0') {

			cursor = nextrune(+1);

			break;

		}

		if (lines > 0)

			return;

		/* fallthrough */

	case XK_Down:

	case XK_KP_Down:

		if (sel && sel->right && (sel = sel->right) == next) {

			curr = next;

			calcoffsets();

		}

		break;

	case XK_Tab:

		if (!sel)

			return;

		cursor = strnlen(sel->text, sizeof text - 1);

		memcpy(text, sel->text, cursor);

		text[cursor] = '\0';

		match();

		break;

	}

draw:

	drawmenu();

}

static void

paste(void)

{

	char *p, *q;

	int di;

	unsigned long dl;

	Atom da;

	/* we have been given the current selection, now insert it into input */

	if (XGetWindowProperty(dpy, win, utf8, 0, (sizeof text / 4) + 1, False,

	                   utf8, &da, &di, &dl, &dl, (unsigned char **)&p)

	    == Success && p) {

		insert(p, (q = strchr(p, '\n')) ? q - p : (ssize_t)strlen(p));

		XFree(p);

	}

	drawmenu();

}

static void

readstdin(void)

{

	char *line = NULL;

	size_t i, itemsiz = 0, linesiz = 0;

	ssize_t len;

	/* read each line from stdin and add it to the item list */

	for (i = 0; (len = getline(&line, &linesiz, stdin)) != -1; i++) {

		if (i + 1 >= itemsiz) {

			itemsiz += 256;

			if (!(items = realloc(items, itemsiz * sizeof(*items))))

				die("cannot realloc %zu bytes:", itemsiz * sizeof(*items));

		}

		if (line[len - 1] == '\n')

			line[len - 1] = '\0';

		if (!(items[i].text = strdup(line)))

			die("strdup:");

		items[i].out = 0;

	}

	free(line);

	if (items)

		items[i].text = NULL;

	lines = MIN(lines, i);

}

static void

run(void)

{

	XEvent ev;

	while (!XNextEvent(dpy, &ev)) {

		if (XFilterEvent(&ev, win))

			continue;

		switch(ev.type) {

		case DestroyNotify:

			if (ev.xdestroywindow.window != win)

				break;

			cleanup();

			exit(1);

		case Expose:

			if (ev.xexpose.count == 0)

				drw_map(drw, win, 0, 0, mw, mh);

			break;

		case FocusIn:

			/* regrab focus from parent window */

			if (ev.xfocus.window != win)

				grabfocus();

			break;

		case KeyPress:

			keypress(&ev.xkey);

			break;

		case SelectionNotify:

			if (ev.xselection.property == utf8)

				paste();

			break;

		case VisibilityNotify:

			if (ev.xvisibility.state != VisibilityUnobscured)

				XRaiseWindow(dpy, win);

			break;

		}

	}

}

static void

setup(void)

{

	int x, y, i, j;

	unsigned int du;

	XSetWindowAttributes swa;

	XIM xim;

	Window w, dw, *dws;

	XWindowAttributes wa;

	XClassHint ch = {"dmenu", "dmenu"};

#ifdef XINERAMA

	XineramaScreenInfo *info;

	Window pw;

	int a, di, n, area = 0;

#endif

	/* init appearance */

	for (j = 0; j < SchemeLast; j++)

		scheme[j] = drw_scm_create(drw, colors[j], 2);

	clip = XInternAtom(dpy, "CLIPBOARD",   False);

	utf8 = XInternAtom(dpy, "UTF8_STRING", False);

	/* calculate menu geometry */

	bh = drw->fonts->h + 2;

	lines = MAX(lines, 0);

	mh = (lines + 1) * bh;

#ifdef XINERAMA

	i = 0;

	if (parentwin == root && (info = XineramaQueryScreens(dpy, &n))) {

		XGetInputFocus(dpy, &w, &di);

		if (mon >= 0 && mon < n)

			i = mon;

		else if (w != root && w != PointerRoot && w != None) {

			/* find top-level window containing current input focus */

			do {

				if (XQueryTree(dpy, (pw = w), &dw, &w, &dws, &du) && dws)

					XFree(dws);

			} while (w != root && w != pw);

			/* find xinerama screen with which the window intersects most */

			if (XGetWindowAttributes(dpy, pw, &wa))

				for (j = 0; j < n; j++)

					if ((a = INTERSECT(wa.x, wa.y, wa.width, wa.height, info[j])) > area) {

						area = a;

						i = j;

					}

		}

		/* no focused window is on screen, so use pointer location instead */

		if (mon < 0 && !area && XQueryPointer(dpy, root, &dw, &dw, &x, &y, &di, &di, &du))

			for (i = 0; i < n; i++)

				if (INTERSECT(x, y, 1, 1, info[i]) != 0)

					break;

		x = info[i].x_org;

		y = info[i].y_org + (topbar ? 0 : info[i].height - mh);

		mw = info[i].width;

		XFree(info);

	} else

#endif

	{

		if (!XGetWindowAttributes(dpy, parentwin, &wa))

			die("could not get embedding window attributes: 0x%lx",

			    parentwin);

		x = 0;

		y = topbar ? 0 : wa.height - mh;

		mw = wa.width;

	}

	promptw = (prompt && *prompt) ? TEXTW(prompt) - lrpad / 4 : 0;

	inputw = mw / 3; /* input width: ~33% of monitor width */

	match();

	/* create menu window */

	swa.override_redirect = True;

	swa.background_pixel = scheme[SchemeNorm][ColBg].pixel;

	swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;

	win = XCreateWindow(dpy, root, x, y, mw, mh, 0,

	                    CopyFromParent, CopyFromParent, CopyFromParent,

	                    CWOverrideRedirect | CWBackPixel | CWEventMask, &swa);

	XSetClassHint(dpy, win, &ch);

	/* input methods */

	if ((xim = XOpenIM(dpy, NULL, NULL, NULL)) == NULL)

		die("XOpenIM failed: could not open input device");

	xic = XCreateIC(xim, XNInputStyle, XIMPreeditNothing | XIMStatusNothing,

	                XNClientWindow, win, XNFocusWindow, win, NULL);

	XMapRaised(dpy, win);

	if (embed) {

		XReparentWindow(dpy, win, parentwin, x, y);

		XSelectInput(dpy, parentwin, FocusChangeMask | SubstructureNotifyMask);

		if (XQueryTree(dpy, parentwin, &dw, &w, &dws, &du) && dws) {

			for (i = 0; i < du && dws[i] != win; ++i)

				XSelectInput(dpy, dws[i], FocusChangeMask);

			XFree(dws);

		}

		grabfocus();

	}

	drw_resize(drw, mw, mh);

	drawmenu();

}

static void

usage(void)

{

	die("usage: dmenu [-bfiv] [-l lines] [-p prompt] [-fn font] [-m monitor]\n"

	    "             [-nb color] [-nf color] [-sb color] [-sf color] [-w windowid]");

}

int

main(int argc, char *argv[])

{

	XWindowAttributes wa;

	int i, fast = 0;

	for (i = 1; i < argc; i++)

		/* these options take no arguments */

		if (!strcmp(argv[i], "-v")) {      /* prints version information */

			puts("dmenu-"VERSION);

			exit(0);

		} else if (!strcmp(argv[i], "-b")) /* appears at the bottom of the screen */

			topbar = 0;

		else if (!strcmp(argv[i], "-f"))   /* grabs keyboard before reading stdin */

			fast = 1;

		else if (!strcmp(argv[i], "-i")) { /* case-insensitive item matching */

			fstrncmp = strncasecmp;

			fstrstr = cistrstr;

		} else if (i + 1 == argc)

			usage();

		/* these options take one argument */

		else if (!strcmp(argv[i], "-l"))   /* number of lines in vertical list */

			lines = atoi(argv[++i]);

		else if (!strcmp(argv[i], "-m"))

			mon = atoi(argv[++i]);

		else if (!strcmp(argv[i], "-p"))   /* adds prompt to left of input field */

			prompt = argv[++i];

		else if (!strcmp(argv[i], "-fn"))  /* font or font set */

			fonts[0] = argv[++i];

		else if (!strcmp(argv[i], "-nb"))  /* normal background color */

			colors[SchemeNorm][ColBg] = argv[++i];

		else if (!strcmp(argv[i], "-nf"))  /* normal foreground color */

			colors[SchemeNorm][ColFg] = argv[++i];

		else if (!strcmp(argv[i], "-sb"))  /* selected background color */

			colors[SchemeSel][ColBg] = argv[++i];

		else if (!strcmp(argv[i], "-sf"))  /* selected foreground color */

			colors[SchemeSel][ColFg] = argv[++i];

		else if (!strcmp(argv[i], "-w"))   /* embedding window id */

			embed = argv[++i];

		else

			usage();

	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())

		fputs("warning: no locale support\n", stderr);

	if (!(dpy = XOpenDisplay(NULL)))

		die("cannot open display");

	screen = DefaultScreen(dpy);

	root = RootWindow(dpy, screen);

	if (!embed || !(parentwin = strtol(embed, NULL, 0)))

		parentwin = root;

	if (!XGetWindowAttributes(dpy, parentwin, &wa))

		die("could not get embedding window attributes: 0x%lx",

		    parentwin);

	drw = drw_create(dpy, screen, root, wa.width, wa.height);

	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))

		die("no fonts could be loaded.");

	lrpad = drw->fonts->h;

#ifdef __OpenBSD__

	if (pledge("stdio rpath", NULL) == -1)

		die("pledge");

#endif

	if (fast && !isatty(0)) {

		grabkeyboard();

		readstdin();

	} else {

		readstdin();

		grabkeyboard();

	}

	setup();

	run();

	return 1; /* unreachable */

}