st/x.c

/* See LICENSE for license details. */
#include <errno.h>
#include <math.h>
#include <limits.h>
#include <locale.h>
#include <signal.h>
#include <sys/select.h>
#include <time.h>
#include <unistd.h>
#include <libgen.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/cursorfont.h>
#include <X11/keysym.h>
#include <X11/Xft/Xft.h>
#include <X11/XKBlib.h>

static char *argv0;
#include "arg.h"
#include "st.h"
#include "win.h"

/* types used in config.h */
typedef struct {
	uint mod;
	KeySym keysym;
	void (*func)(const Arg *);
	const Arg arg;
} Shortcut;

typedef struct {
	uint mod;
	uint button;
	void (*func)(const Arg *);
	const Arg arg;
} MouseShortcut;

typedef struct {
	KeySym k;
	uint mask;
	char *s;
	/* three-valued logic variables: 0 indifferent, 1 on, -1 off */
	signed char appkey;    /* application keypad */
	signed char appcursor; /* application cursor */
} Key;

/* X modifiers */
#define XK_ANY_MOD    UINT_MAX
#define XK_NO_MOD     0
#define XK_SWITCH_MOD (1<<13)

/* function definitions used in config.h */
static void clipcopy(const Arg *);
static void clippaste(const Arg *);
static void numlock(const Arg *);
static void selpaste(const Arg *);
static void zoom(const Arg *);
static void zoomabs(const Arg *);
static void zoomreset(const Arg *);
static void ttysend(const Arg *);

/* config.h for applying patches and the configuration. */
#include "config.h"

/* XEMBED messages */
#define XEMBED_FOCUS_IN  4
#define XEMBED_FOCUS_OUT 5

/* macros */
#define IS_SET(flag)		((win.mode & (flag)) != 0)
#define TRUERED(x)		(((x) & 0xff0000) >> 8)
#define TRUEGREEN(x)		(((x) & 0xff00))
#define TRUEBLUE(x)		(((x) & 0xff) << 8)

typedef XftDraw *Draw;
typedef XftColor Color;
typedef XftGlyphFontSpec GlyphFontSpec;

/* Purely graphic info */
typedef struct {
	int tw, th; /* tty width and height */
	int w, h; /* window width and height */
	int ch; /* char height */
	int cw; /* char width  */
	int mode; /* window state/mode flags */
	int cursor; /* cursor style */
} TermWindow;

typedef struct {
	Display *dpy;
	Colormap cmap;
	Window win;
	Drawable buf;
	GlyphFontSpec *specbuf; /* font spec buffer used for rendering */
	Atom xembed, wmdeletewin, netwmname, netwmpid;
	XIM xim;
	XIC xic;
	Draw draw;
	Visual *vis;
	XSetWindowAttributes attrs;
	int scr;
	int isfixed; /* is fixed geometry? */
	int l, t; /* left and top offset */
	int gm; /* geometry mask */
} XWindow;

typedef struct {
	Atom xtarget;
	char *primary, *clipboard;
	struct timespec tclick1;
	struct timespec tclick2;
} XSelection;

/* Font structure */
#define Font Font_
typedef struct {
	int height;
	int width;
	int ascent;
	int descent;
	int badslant;
	int badweight;
	short lbearing;
	short rbearing;
	XftFont *match;
	FcFontSet *set;
	FcPattern *pattern;
} Font;

/* Drawing Context */
typedef struct {
	Color *col;
	size_t collen;
	Font font, bfont, ifont, ibfont;
	GC gc;
} DC;

static inline ushort sixd_to_16bit(int);
static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int, int);
static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int, int);
static void xdrawglyph(Glyph, int, int);
static void xclear(int, int, int, int);
static int xgeommasktogravity(int);
static void ximopen(Display *);
static void ximinstantiate(Display *, XPointer, XPointer);
static void ximdestroy(XIM, XPointer, XPointer);
static void xinit(int, int);
static void cresize(int, int);
static void xresize(int, int);
static void xhints(void);
static int xloadcolor(int, const char *, Color *);
static int xloadfont(Font *, FcPattern *);
static void xloadfonts(char *, double);
static void xunloadfont(Font *);
static void xunloadfonts(void);
static void xsetenv(void);
static void xseturgency(int);
static int evcol(XEvent *);
static int evrow(XEvent *);

static void expose(XEvent *);
static void visibility(XEvent *);
static void unmap(XEvent *);
static void kpress(XEvent *);
static void cmessage(XEvent *);
static void resize(XEvent *);
static void focus(XEvent *);
static void brelease(XEvent *);
static void bpress(XEvent *);
static void bmotion(XEvent *);
static void propnotify(XEvent *);
static void selnotify(XEvent *);
static void selclear_(XEvent *);
static void selrequest(XEvent *);
static void setsel(char *, Time);
static void mousesel(XEvent *, int);
static void mousereport(XEvent *);
static char *kmap(KeySym, uint);
static int match(uint, uint);

static void run(void);
static void usage(void);

static void (*handler[LASTEvent])(XEvent *) = {
	[KeyPress] = kpress,
	[ClientMessage] = cmessage,
	[ConfigureNotify] = resize,
	[VisibilityNotify] = visibility,
	[UnmapNotify] = unmap,
	[Expose] = expose,
	[FocusIn] = focus,
	[FocusOut] = focus,
	[MotionNotify] = bmotion,
	[ButtonPress] = bpress,
	[ButtonRelease] = brelease,
/*
 * Uncomment if you want the selection to disappear when you select something
 * different in another window.
 */
/*	[SelectionClear] = selclear_, */
	[SelectionNotify] = selnotify,
/*
 * PropertyNotify is only turned on when there is some INCR transfer happening
 * for the selection retrieval.
 */
	[PropertyNotify] = propnotify,
	[SelectionRequest] = selrequest,
};

/* Globals */
static DC dc;
static XWindow xw;
static XSelection xsel;
static TermWindow win;

/* Font Ring Cache */
enum {
	FRC_NORMAL,
	FRC_ITALIC,
	FRC_BOLD,
	FRC_ITALICBOLD
};

typedef struct {
	XftFont *font;
	int flags;
	Rune unicodep;
} Fontcache;

/* Fontcache is an array now. A new font will be appended to the array. */
static Fontcache *frc = NULL;
static int frclen = 0;
static int frccap = 0;
static char *usedfont = NULL;
static double usedfontsize = 0;
static double defaultfontsize = 0;

static char *opt_class = NULL;
static char **opt_cmd  = NULL;
static char *opt_embed = NULL;
static char *opt_font  = NULL;
static char *opt_io    = NULL;
static char *opt_line  = NULL;
static char *opt_name  = NULL;
static char *opt_title = NULL;

static int oldbutton = 3; /* button event on startup: 3 = release */

void
clipcopy(const Arg *dummy)
{
	Atom clipboard;

	free(xsel.clipboard);
	xsel.clipboard = NULL;

	if (xsel.primary != NULL) {
		xsel.clipboard = xstrdup(xsel.primary);
		clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
		XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
	}
}

void
clippaste(const Arg *dummy)
{
	Atom clipboard;

	clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
	XConvertSelection(xw.dpy, clipboard, xsel.xtarget, clipboard,
			xw.win, CurrentTime);
}

void
selpaste(const Arg *dummy)
{
	XConvertSelection(xw.dpy, XA_PRIMARY, xsel.xtarget, XA_PRIMARY,
			xw.win, CurrentTime);
}

void
numlock(const Arg *dummy)
{
	win.mode ^= MODE_NUMLOCK;
}

void
zoom(const Arg *arg)
{
	Arg larg;

	larg.f = usedfontsize + arg->f;
	zoomabs(&larg);
}

void
zoomabs(const Arg *arg)
{
	xunloadfonts();
	xloadfonts(usedfont, arg->f);
	cresize(0, 0);
	redraw();
	xhints();
}

void
zoomreset(const Arg *arg)
{
	Arg larg;

	if (defaultfontsize > 0) {
		larg.f = defaultfontsize;
		zoomabs(&larg);
	}
}

void
ttysend(const Arg *arg)
{
	ttywrite(arg->s, strlen(arg->s), 1);
}

int
evcol(XEvent *e)
{
	int x = e->xbutton.x - borderpx;
	LIMIT(x, 0, win.tw - 1);
	return x / win.cw;
}

int
evrow(XEvent *e)
{
	int y = e->xbutton.y - borderpx;
	LIMIT(y, 0, win.th - 1);
	return y / win.ch;
}

void
mousesel(XEvent *e, int done)
{
	int type, seltype = SEL_REGULAR;
	uint state = e->xbutton.state & ~(Button1Mask | forcemousemod);

	for (type = 1; type < LEN(selmasks); ++type) {
		if (match(selmasks[type], state)) {
			seltype = type;
			break;
		}
	}
	selextend(evcol(e), evrow(e), seltype, done);
	if (done)
		setsel(getsel(), e->xbutton.time);
}

void
mousereport(XEvent *e)
{
	int len, x = evcol(e), y = evrow(e),
	    button = e->xbutton.button, state = e->xbutton.state;
	char buf[40];
	static int ox, oy;

	/* from urxvt */
	if (e->xbutton.type == MotionNotify) {
		if (x == ox && y == oy)
			return;
		if (!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
			return;
		/* MOUSE_MOTION: no reporting if no button is pressed */
		if (IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
			return;

		button = oldbutton + 32;
		ox = x;
		oy = y;
	} else {
		if (!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
			button = 3;
		} else {
			button -= Button1;
			if (button >= 3)
				button += 64 - 3;
		}
		if (e->xbutton.type == ButtonPress) {
			oldbutton = button;
			ox = x;
			oy = y;
		} else if (e->xbutton.type == ButtonRelease) {
			oldbutton = 3;
			/* MODE_MOUSEX10: no button release reporting */
			if (IS_SET(MODE_MOUSEX10))
				return;
			if (button == 64 || button == 65)
				return;
		}
	}

	if (!IS_SET(MODE_MOUSEX10)) {
		button += ((state & ShiftMask  ) ? 4  : 0)
			+ ((state & Mod4Mask   ) ? 8  : 0)
			+ ((state & ControlMask) ? 16 : 0);
	}

	if (IS_SET(MODE_MOUSESGR)) {
		len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
				button, x+1, y+1,
				e->xbutton.type == ButtonRelease ? 'm' : 'M');
	} else if (x < 223 && y < 223) {
		len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
				32+button, 32+x+1, 32+y+1);
	} else {
		return;
	}

	ttywrite(buf, len, 0);
}

void
bpress(XEvent *e)
{
	struct timespec now;
	MouseShortcut *ms;
	int snap;

	if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod)) {
		mousereport(e);
		return;
	}

	for (ms = mshortcuts; ms < mshortcuts + LEN(mshortcuts); ms++) {
		if (e->xbutton.button == ms->button &&
		    match(ms->mod, e->xbutton.state & ~forcemousemod)) {
			ms->func(&(ms->arg));
			return;
		}
	}

	if (e->xbutton.button == Button1) {
		/*
		 * If the user clicks below predefined timeouts specific
		 * snapping behaviour is exposed.
		 */
		clock_gettime(CLOCK_MONOTONIC, &now);
		if (TIMEDIFF(now, xsel.tclick2) <= tripleclicktimeout) {
			snap = SNAP_LINE;
		} else if (TIMEDIFF(now, xsel.tclick1) <= doubleclicktimeout) {
			snap = SNAP_WORD;
		} else {
			snap = 0;
		}
		xsel.tclick2 = xsel.tclick1;
		xsel.tclick1 = now;

		selstart(evcol(e), evrow(e), snap);
	}
}

void
propnotify(XEvent *e)
{
	XPropertyEvent *xpev;
	Atom clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);

	xpev = &e->xproperty;
	if (xpev->state == PropertyNewValue &&
			(xpev->atom == XA_PRIMARY ||
			 xpev->atom == clipboard)) {
		selnotify(e);
	}
}

void
selnotify(XEvent *e)
{
	ulong nitems, ofs, rem;
	int format;
	uchar *data, *last, *repl;
	Atom type, incratom, property = None;

	incratom = XInternAtom(xw.dpy, "INCR", 0);

	ofs = 0;
	if (e->type == SelectionNotify)
		property = e->xselection.property;
	else if (e->type == PropertyNotify)
		property = e->xproperty.atom;

	if (property == None)
		return;

	do {
		if (XGetWindowProperty(xw.dpy, xw.win, property, ofs,
					BUFSIZ/4, False, AnyPropertyType,
					&type, &format, &nitems, &rem,
					&data)) {
			fprintf(stderr, "Clipboard allocation failed\n");
			return;
		}

		if (e->type == PropertyNotify && nitems == 0 && rem == 0) {
			/*
			 * If there is some PropertyNotify with no data, then
			 * this is the signal of the selection owner that all
			 * data has been transferred. We won't need to receive
			 * PropertyNotify events anymore.
			 */
			MODBIT(xw.attrs.event_mask, 0, PropertyChangeMask);
			XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask,
					&xw.attrs);
		}

		if (type == incratom) {
			/*
			 * Activate the PropertyNotify events so we receive
			 * when the selection owner does send us the next
			 * chunk of data.
			 */
			MODBIT(xw.attrs.event_mask, 1, PropertyChangeMask);
			XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask,
					&xw.attrs);

			/*
			 * Deleting the property is the transfer start signal.
			 */
			XDeleteProperty(xw.dpy, xw.win, (int)property);
			continue;
		}

		/*
		 * As seen in getsel:
		 * Line endings are inconsistent in the terminal and GUI world
		 * copy and pasting. When receiving some selection data,
		 * replace all '\n' with '\r'.
		 * FIXME: Fix the computer world.
		 */
		repl = data;
		last = data + nitems * format / 8;
		while ((repl = memchr(repl, '\n', last - repl))) {
			*repl++ = '\r';
		}

		if (IS_SET(MODE_BRCKTPASTE) && ofs == 0)
			ttywrite("\033[200~", 6, 0);
		ttywrite((char *)data, nitems * format / 8, 1);
		if (IS_SET(MODE_BRCKTPASTE) && rem == 0)
			ttywrite("\033[201~", 6, 0);
		XFree(data);
		/* number of 32-bit chunks returned */
		ofs += nitems * format / 32;
	} while (rem > 0);

	/*
	 * Deleting the property again tells the selection owner to send the
	 * next data chunk in the property.
	 */
	XDeleteProperty(xw.dpy, xw.win, (int)property);
}

void
xclipcopy(void)
{
	clipcopy(NULL);
}

void
selclear_(XEvent *e)
{
	selclear();
}

void
selrequest(XEvent *e)
{
	XSelectionRequestEvent *xsre;
	XSelectionEvent xev;
	Atom xa_targets, string, clipboard;
	char *seltext;

	xsre = (XSelectionRequestEvent *) e;
	xev.type = SelectionNotify;
	xev.requestor = xsre->requestor;
	xev.selection = xsre->selection;
	xev.target = xsre->target;
	xev.time = xsre->time;
	if (xsre->property == None)
		xsre->property = xsre->target;

	/* reject */
	xev.property = None;

	xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
	if (xsre->target == xa_targets) {
		/* respond with the supported type */
		string = xsel.xtarget;
		XChangeProperty(xsre->display, xsre->requestor, xsre->property,
				XA_ATOM, 32, PropModeReplace,
				(uchar *) &string, 1);
		xev.property = xsre->property;
	} else if (xsre->target == xsel.xtarget || xsre->target == XA_STRING) {
		/*
		 * xith XA_STRING non ascii characters may be incorrect in the
		 * requestor. It is not our problem, use utf8.
		 */
		clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
		if (xsre->selection == XA_PRIMARY) {
			seltext = xsel.primary;
		} else if (xsre->selection == clipboard) {
			seltext = xsel.clipboard;
		} else {
			fprintf(stderr,
				"Unhandled clipboard selection 0x%lx\n",
				xsre->selection);
			return;
		}
		if (seltext != NULL) {
			XChangeProperty(xsre->display, xsre->requestor,
					xsre->property, xsre->target,
					8, PropModeReplace,
					(uchar *)seltext, strlen(seltext));
			xev.property = xsre->property;
		}
	}

	/* all done, send a notification to the listener */
	if (!XSendEvent(xsre->display, xsre->requestor, 1, 0, (XEvent *) &xev))
		fprintf(stderr, "Error sending SelectionNotify event\n");
}

void
setsel(char *str, Time t)
{
	if (!str)
		return;

	free(xsel.primary);
	xsel.primary = str;

	XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
	if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
		selclear();
}

void
xsetsel(char *str)
{
	setsel(str, CurrentTime);
}

void
brelease(XEvent *e)
{
	if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod)) {
		mousereport(e);
		return;
	}

	if (e->xbutton.button == Button2)
		selpaste(NULL);
	else if (e->xbutton.button == Button1)
		mousesel(e, 1);
}

void
bmotion(XEvent *e)
{
	if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod)) {
		mousereport(e);
		return;
	}

	mousesel(e, 0);
}

void
cresize(int width, int height)
{
	int col, row;

	if (width != 0)
		win.w = width;
	if (height != 0)
		win.h = height;

	col = (win.w - 2 * borderpx) / win.cw;
	row = (win.h - 2 * borderpx) / win.ch;
	col = MAX(1, col);
	row = MAX(1, row);

	tresize(col, row);
	xresize(col, row);
	ttyresize(win.tw, win.th);
}

void
xresize(int col, int row)
{
	win.tw = col * win.cw;
	win.th = row * win.ch;

	XFreePixmap(xw.dpy, xw.buf);
	xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
			DefaultDepth(xw.dpy, xw.scr));
	XftDrawChange(xw.draw, xw.buf);
	xclear(0, 0, win.w, win.h);

	/* resize to new width */
	xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
}

ushort
sixd_to_16bit(int x)
{
	return x == 0 ? 0 : 0x3737 + 0x2828 * x;
}

int
xloadcolor(int i, const char *name, Color *ncolor)
{
	XRenderColor color = { .alpha = 0xffff };

	if (!name) {
		if (BETWEEN(i, 16, 255)) { /* 256 color */
			if (i < 6*6*6+16) { /* same colors as xterm */
				color.red   = sixd_to_16bit( ((i-16)/36)%6 );
				color.green = sixd_to_16bit( ((i-16)/6) %6 );
				color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
			} else { /* greyscale */
				color.red = 0x0808 + 0x0a0a * (i - (6*6*6+16));
				color.green = color.blue = color.red;
			}
			return XftColorAllocValue(xw.dpy, xw.vis,
			                          xw.cmap, &color, ncolor);
		} else
			name = colorname[i];
	}

	return XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, ncolor);
}

void
xloadcols(void)
{
	int i;
	static int loaded;
	Color *cp;

	if (loaded) {
		for (cp = dc.col; cp < &dc.col[dc.collen]; ++cp)
			XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
	} else {
		dc.collen = MAX(LEN(colorname), 256);
		dc.col = xmalloc(dc.collen * sizeof(Color));
	}

	for (i = 0; i < dc.collen; i++)
		if (!xloadcolor(i, NULL, &dc.col[i])) {
			if (colorname[i])
				die("could not allocate color '%s'\n", colorname[i]);
			else
				die("could not allocate color %d\n", i);
		}
	loaded = 1;
}

int
xsetcolorname(int x, const char *name)
{
	Color ncolor;

	if (!BETWEEN(x, 0, dc.collen))
		return 1;

	if (!xloadcolor(x, name, &ncolor))
		return 1;

	XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
	dc.col[x] = ncolor;

	return 0;
}

/*
 * Absolute coordinates.
 */
void
xclear(int x1, int y1, int x2, int y2)
{
	XftDrawRect(xw.draw,
			&dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
			x1, y1, x2-x1, y2-y1);
}

void
xhints(void)
{
	XClassHint class = {opt_name ? opt_name : termname,
	                    opt_class ? opt_class : termname};
	XWMHints wm = {.flags = InputHint, .input = 1};
	XSizeHints *sizeh;

	sizeh = XAllocSizeHints();

	sizeh->flags = PSize | PResizeInc | PBaseSize | PMinSize;
	sizeh->height = win.h;
	sizeh->width = win.w;
	sizeh->height_inc = win.ch;
	sizeh->width_inc = win.cw;
	sizeh->base_height = 2 * borderpx;
	sizeh->base_width = 2 * borderpx;
	sizeh->min_height = win.ch + 2 * borderpx;
	sizeh->min_width = win.cw + 2 * borderpx;
	if (xw.isfixed) {
		sizeh->flags |= PMaxSize;
		sizeh->min_width = sizeh->max_width = win.w;
		sizeh->min_height = sizeh->max_height = win.h;
	}
	if (xw.gm & (XValue|YValue)) {
		sizeh->flags |= USPosition | PWinGravity;
		sizeh->x = xw.l;
		sizeh->y = xw.t;
		sizeh->win_gravity = xgeommasktogravity(xw.gm);
	}

	XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
			&class);
	XFree(sizeh);
}

int
xgeommasktogravity(int mask)
{
	switch (mask & (XNegative|YNegative)) {
	case 0:
		return NorthWestGravity;
	case XNegative:
		return NorthEastGravity;
	case YNegative:
		return SouthWestGravity;
	}

	return SouthEastGravity;
}

int
xloadfont(Font *f, FcPattern *pattern)
{
	FcPattern *configured;
	FcPattern *match;
	FcResult result;
	XGlyphInfo extents;
	int wantattr, haveattr;

	/*
	 * Manually configure instead of calling XftMatchFont
	 * so that we can use the configured pattern for
	 * "missing glyph" lookups.
	 */
	configured = FcPatternDuplicate(pattern);
	if (!configured)
		return 1;

	FcConfigSubstitute(NULL, configured, FcMatchPattern);
	XftDefaultSubstitute(xw.dpy, xw.scr, configured);

	match = FcFontMatch(NULL, configured, &result);
	if (!match) {
		FcPatternDestroy(configured);
		return 1;
	}

	if