Added xrandrfontsize v0.8.4 patch

Ignore processing and printing C1 control characters in UTF-8 mode.
These are in the range: 0x80 - 0x9f.

By default in st the mode is set to UTF-8.

This matches more the behaviour of xterm with the options -u8 or +u8 also.
Also see the xterm resource "allowC1Printable".

Let me know if this breaks something, in most cases I don't think so.

As usual a very good reference is:
https://invisible-island.net/xterm/ctlseqs/ctlseqs.html

.gitignore

@@ -0,0 +1,2 @@
+*.o
+*.orig

FAQ

@@ -248,3 +248,6 @@ fonts:
 
 Please don't bother reporting this bug to st, but notify the upstream Xft
 developers about fixing this bug.
+
+As of 2022-09-05 this now seems to be finally fixed in libXft 2.3.5:
+https://gitlab.freedesktop.org/xorg/lib/libxft/-/blob/libXft-2.3.5/NEWS

config.def.h

@@ -8,6 +8,20 @@
 static char *font = "Liberation Mono:pixelsize=12:antialias=true:autohint=true";
 static int borderpx = 2;
 
+/*
+ * Override/adjust fontsize of choosen monitors:
+ */
+MonitorConfig monitors_config[] = {
+	// skip = fixed relative points size (monitor dpi)
+	//   =0 : fixed absolute pixel size (default screen dpi)
+	//   >0 : auto absolute pixel size (monitor dpi)
+	//   <0 : auto relative points size (monitor dpi)
+	// {"DP-1", 0}, // BUG:(size=0): not restored to default after back'n'forth
+	{"HDMI-0~1", -20},  // BUG:(ignored DPI=220): = 20 is eqv to 10pt (DPI=110)
+	{"HDMI-0~2", -14},
+};
+float winmovethreshold = 0.6;
+
 /*
  * What program is execed by st depends of these precedence rules:
  * 1: program passed with -e
@@ -196,6 +210,7 @@ static Shortcut shortcuts[] = {
 	{ TERMMOD,              XK_Prior,       zoom,           {.f = +1} },
 	{ TERMMOD,              XK_Next,        zoom,           {.f = -1} },
 	{ TERMMOD,              XK_Home,        zoomreset,      {.f =  0} },
+	{ TERMMOD,              XK_End,         refreshxrandr,  {.i =  0} },
 	{ TERMMOD,              XK_C,           clipcopy,       {.i =  0} },
 	{ TERMMOD,              XK_V,           clippaste,      {.i =  0} },
 	{ TERMMOD,              XK_Y,           selpaste,       {.i =  0} },

config.mk

@@ -1,5 +1,5 @@
 # st version
-VERSION = 0.8.5
+VERSION = 0.9
 
 # Customize below to fit your system
 
@@ -20,6 +20,8 @@ LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
        `$(PKG_CONFIG) --libs fontconfig` \
        `$(PKG_CONFIG) --libs freetype2`
 
+LIBS += -lXrandr
+
 # flags
 STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
 STCFLAGS = $(INCS) $(STCPPFLAGS) $(CPPFLAGS) $(CFLAGS)
@@ -30,6 +32,7 @@ STLDFLAGS = $(LIBS) $(LDFLAGS)
 #LIBS = -L$(X11LIB) -lm -lX11 -lutil -lXft \
 #       `$(PKG_CONFIG) --libs fontconfig` \
 #       `$(PKG_CONFIG) --libs freetype2`
+#MANPREFIX = ${PREFIX}/man
 
 # compiler and linker
 # CC = c99

st.c

@@ -161,6 +161,7 @@ static void csidump(void);
 static void csihandle(void);
 static void csiparse(void);
 static void csireset(void);
+static void osc_color_response(int, int, int);
 static int eschandle(uchar);
 static void strdump(void);
 static void strhandle(void);
@@ -938,7 +939,7 @@ ttyresize(int tw, int th)
 }
 
 void
-ttyhangup()
+ttyhangup(void)
 {
 	/* Send SIGHUP to shell */
 	kill(pid, SIGHUP);
@@ -1768,11 +1769,18 @@ csihandle(void)
 	case 'm': /* SGR -- Terminal attribute (color) */
 		tsetattr(csiescseq.arg, csiescseq.narg);
 		break;
-	case 'n': /* DSR – Device Status Report (cursor position) */
+	case 'n': /* DSR -- Device Status Report */
-		if (csiescseq.arg[0] == 6) {
+		switch (csiescseq.arg[0]) {
+		case 5: /* Status Report "OK" `0n` */
+			ttywrite("\033[0n", sizeof("\033[0n") - 1, 0);
+			break;
+		case 6: /* Report Cursor Position (CPR) "<row>;<column>R" */
 			len = snprintf(buf, sizeof(buf), "\033[%i;%iR",
 			               term.c.y+1, term.c.x+1);
 			ttywrite(buf, len, 0);
+			break;
+		default:
+			goto unknown;
 		}
 		break;
 	case 'r': /* DECSTBM -- Set Scrolling Region */
@@ -1835,39 +1843,28 @@ csireset(void)
 }
 
 void
-osc4_color_response(int num)
+osc_color_response(int num, int index, int is_osc4)
 {
 	int n;
 	char buf[32];
 	unsigned char r, g, b;
 
-	if (xgetcolor(num, &r, &g, &b)) {
+	if (xgetcolor(is_osc4 ? num : index, &r, &g, &b)) {
-		fprintf(stderr, "erresc: failed to fetch osc4 color %d\n", num);
+		fprintf(stderr, "erresc: failed to fetch %s color %d\n",
+		        is_osc4 ? "osc4" : "osc",
+		        is_osc4 ? num : index);
 		return;
 	}
 
-	n = snprintf(buf, sizeof buf, "\033]4;%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
+	n = snprintf(buf, sizeof buf, "\033]%s%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
-		     num, r, r, g, g, b, b);
+	             is_osc4 ? "4;" : "", num, r, r, g, g, b, b);
-
+	if (n < 0 || n >= sizeof(buf)) {
+		fprintf(stderr, "error: %s while printing %s response\n",
+		        n < 0 ? "snprintf failed" : "truncation occurred",
+		        is_osc4 ? "osc4" : "osc");
+	} else {
 		ttywrite(buf, n, 1);
-}
-
-void
-osc_color_response(int index, int num)
-{
-	int n;
-	char buf[32];
-	unsigned char r, g, b;
-
-	if (xgetcolor(index, &r, &g, &b)) {
-		fprintf(stderr, "erresc: failed to fetch osc color %d\n", index);
-		return;
 	}
-
-	n = snprintf(buf, sizeof buf, "\033]%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
-		     num, r, r, g, g, b, b);
-
-	ttywrite(buf, n, 1);
 }
 
 void
@@ -1875,6 +1872,11 @@ strhandle(void)
 {
 	char *p = NULL, *dec;
 	int j, narg, par;
+	const struct { int idx; char *str; } osc_table[] = {
+		{ defaultfg, "foreground" },
+		{ defaultbg, "background" },
+		{ defaultcs, "cursor" }
+	};
 
 	term.esc &= ~(ESC_STR_END|ESC_STR);
 	strparse();
@@ -1909,43 +1911,22 @@ strhandle(void)
 			}
 			return;
 		case 10:
-			if (narg < 2)
-				break;
-
-			p = strescseq.args[1];
-
-			if (!strcmp(p, "?"))
-				osc_color_response(defaultfg, 10);
-			else if (xsetcolorname(defaultfg, p))
-				fprintf(stderr, "erresc: invalid foreground color: %s\n", p);
-			else
-				tfulldirt();
-			return;
 		case 11:
-			if (narg < 2)
-				break;
-
-			p = strescseq.args[1];
-
-			if (!strcmp(p, "?"))
-				osc_color_response(defaultbg, 11);
-			else if (xsetcolorname(defaultbg, p))
-				fprintf(stderr, "erresc: invalid background color: %s\n", p);
-			else
-				tfulldirt();
-			return;
 		case 12:
 			if (narg < 2)
 				break;
-
 			p = strescseq.args[1];
+			if ((j = par - 10) < 0 || j >= LEN(osc_table))
+				break; /* shouldn't be possible */
 
-			if (!strcmp(p, "?"))
+			if (!strcmp(p, "?")) {
-				osc_color_response(defaultcs, 12);
+				osc_color_response(par, osc_table[j].idx, 0);
-			else if (xsetcolorname(defaultcs, p))
+			} else if (xsetcolorname(osc_table[j].idx, p)) {
-				fprintf(stderr, "erresc: invalid cursor color: %s\n", p);
+				fprintf(stderr, "erresc: invalid %s color: %s\n",
-			else
+				        osc_table[j].str, p);
+			} else {
 				tfulldirt();
+			}
 			return;
 		case 4: /* color set */
 			if (narg < 3)
@@ -1955,11 +1936,13 @@ strhandle(void)
 		case 104: /* color reset */
 			j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
 
-			if (p && !strcmp(p, "?"))
+			if (p && !strcmp(p, "?")) {
-				osc4_color_response(j);
+				osc_color_response(j, 0, 1);
-			else if (xsetcolorname(j, p)) {
+			} else if (xsetcolorname(j, p)) {
-				if (par == 104 && narg <= 1)
+				if (par == 104 && narg <= 1) {
+					xloadcols();
 					return; /* color reset without parameter */
+				}
 				fprintf(stderr, "erresc: invalid color j=%d, p=%s\n",
 				        j, p ? p : "(null)");
 			} else {
@@ -2439,6 +2422,9 @@ check_control_code:
 	 * they must not cause conflicts with sequences.
 	 */
 	if (control) {
+		/* in UTF-8 mode ignore handling C1 control characters */
+		if (IS_SET(MODE_UTF8) && ISCONTROLC1(u))
+			return;
 		tcontrolcode(u);
 		/*
 		 * control codes are not shown ever

st.h

@@ -111,8 +111,6 @@ void *xmalloc(size_t);
 void *xrealloc(void *, size_t);
 char *xstrdup(const char *);
 
-int xgetcolor(int x, unsigned char *r, unsigned char *g, unsigned char *b);
-
 /* config.h globals */
 extern char *utmp;
 extern char *scroll;

win.h

@@ -30,6 +30,7 @@ void xdrawline(Line, int, int, int);
 void xfinishdraw(void);
 void xloadcols(void);
 int xsetcolorname(int, const char *);
+int xgetcolor(int, unsigned char *, unsigned char *, unsigned char *);
 void xseticontitle(char *);
 void xsettitle(char *);
 int xsetcursor(int);

x.c

@@ -14,6 +14,7 @@
 #include <X11/keysym.h>
 #include <X11/Xft/Xft.h>
 #include <X11/XKBlib.h>
+#include <X11/extensions/Xrandr.h>
 
 char *argv0;
 #include "arg.h"
@@ -45,6 +46,19 @@ typedef struct {
 	signed char appcursor; /* application cursor */
 } Key;
 
+typedef struct {
+	const char *name;
+	float defaultfontsize;
+} MonitorConfig;
+
+typedef struct {
+	Atom name;
+	int x, y, w, h;
+	float defaultfontsize, usedfontsize;
+} MonitorInfo;
+
+static void refreshxrandr(const Arg *dummy);
+
 /* X modifiers */
 #define XK_ANY_MOD    UINT_MAX
 #define XK_NO_MOD     0
@@ -215,6 +229,11 @@ static void (*handler[LASTEvent])(XEvent *) = {
 	[SelectionRequest] = selrequest,
 };
 
+static double defaultrelfontsize = 0;
+static MonitorInfo *monitors_info = NULL;
+static int monitors_num = 0;
+static int prev_mindex = -1;
+
 /* Globals */
 static DC dc;
 static XWindow xw;
@@ -1753,6 +1772,144 @@ xseturgency(int add)
 	XFree(h);
 }
 
+static void
+cachemonitorinfo()
+{
+	int prev_num = monitors_num;
+	MonitorInfo *prev_info = monitors_info;
+	XRRMonitorInfo *xmonitors = XRRGetMonitors(xw.dpy, XRootWindow(xw.dpy, xw.scr), 1, &monitors_num);
+	if (!monitors_num)
+		die("xrandr found no monitors");
+
+	monitors_info = xmalloc(monitors_num * sizeof(MonitorInfo));
+
+	for (int i = 0; i < monitors_num; ++i) {
+		XRRMonitorInfo *xm = &xmonitors[i];
+		MonitorInfo *m = &monitors_info[i];
+
+		m->name = xm->name;
+		m->x = xm->x;
+		m->y = xm->y;
+		m->w = xm->width;
+		m->h = xm->height;
+
+		float px_mm = ((float)m->w / xm->mwidth + (float)m->h / xm->mheight) / 2;
+		float px_pt = 25.4 * px_mm / 72;
+		m->defaultfontsize = defaultrelfontsize * px_pt;
+
+		// Override defaultfontsize (dpi) by user config
+		char *name = XGetAtomName(xw.dpy, xm->name);
+		for (int j = 0; j < LEN(monitors_config); ++j)
+			if (!strcmp(name, monitors_config[j].name)) {
+				m->defaultfontsize = monitors_config[j].defaultfontsize;
+				if (m->defaultfontsize < 0)
+					m->defaultfontsize *= -px_pt;
+				break;
+			}
+		// fprintf(stderr, "%s: %fpx, %f\n", name, m->defaultfontsize, m->usedfontsize);
+		XFree(name);
+
+		// Restore usedfontsize (zoom) after re-cache for monitors with the same name
+		m->usedfontsize = m->defaultfontsize;
+		for (int j = 0; j < prev_num; ++j)
+			if (prev_info[j].name == m->name) {
+				m->usedfontsize = prev_info[j].usedfontsize;
+				break;
+			}
+	}
+
+	XRRFreeMonitors(xmonitors);
+	free(prev_info);
+}
+
+static int
+getmonitorindex_threshold(int w, int h, int x, int y)
+{
+	int mindex = -1;
+	float fontsize = 0;
+	int thresholdarea = winmovethreshold * w * h;
+
+	for (int i = 0; i < monitors_num; ++i) {
+		MonitorInfo *m = &monitors_info[i];
+		int overlap_w = MAX(0, MIN(x + w, m->x + m->w) - MAX(x, m->x));
+		int overlap_h = MAX(0, MIN(y + h, m->y + m->h) - MAX(y, m->y));
+		int area = overlap_w * overlap_h;
+		// Choose monitor with largest dpi (defaultfontsize)
+		//  from all "mirrored"/overlapped (e.g. projector)
+		if (area >= thresholdarea && fontsize < m->defaultfontsize) {
+			fontsize = m->defaultfontsize;
+			mindex = i;
+		}
+	}
+	return mindex;
+}
+
+static int
+getmonitorindex_nearest(int w, int h, int x, int y)
+{
+	int mindex = -1;
+	float fontsize = 0;
+	int overlaparea = 0;
+
+	for (int i = 0; i < monitors_num; ++i) {
+		MonitorInfo *m = &monitors_info[i];
+		int overlap_w = MAX(0, MIN(x + w, m->x + m->w) - MAX(x, m->x));
+		int overlap_h = MAX(0, MIN(y + h, m->y + m->h) - MAX(y, m->y));
+		int area = overlap_w * overlap_h;
+		// Choose monitor with largest overlapping area
+		//  e.g. when "st" is initially spawned in-between monitors
+		if (area > overlaparea) {
+			overlaparea = area;
+			mindex = i;
+		}
+	}
+	return mindex;
+}
+
+static void
+adjustmonitorfontsize(int mindex)
+{
+	if (mindex < 0 || prev_mindex == mindex)
+		return;
+	// Save zoom of current monitor before switching
+	if (prev_mindex >= 0)
+		monitors_info[prev_mindex].usedfontsize = usedfontsize;
+
+	defaultfontsize = monitors_info[mindex].defaultfontsize;
+	// fprintf(stderr, "Crossing: %fpx\n", defaultfontsize);
+
+	// NOTE: do nothing if font size differs by less than 1%
+	double fontsize = monitors_info[mindex].usedfontsize;
+	double delta = 0.01 * usedfontsize;
+	if (!BETWEEN(fontsize - usedfontsize, -delta, delta)) {
+		// fprintf(stderr, "Adjusted: %fpx\n", fontsize);
+		xunloadfonts();
+		xloadfonts(usedfont, fontsize);
+	}
+	prev_mindex = mindex;
+}
+
+void
+refreshxrandr(const Arg *dummy)
+{
+	// Reset index to detect change of window association on "xrandr ... --primary"
+	//  otherwise: zoom won't be saved on switching and new font size won't be loaded
+	// CRIT!!! event from xrandr may place another monitor into same index
+	if (prev_mindex >= 0)
+		monitors_info[prev_mindex].usedfontsize = usedfontsize;
+	prev_mindex = -1;
+
+	XWindowAttributes xattr = {0};
+	cachemonitorinfo();
+	XGetWindowAttributes(xw.dpy, xw.win, &xattr);
+
+	int mindex = getmonitorindex_threshold(xattr.width, xattr.height, xattr.x, xattr.y);
+	if (mindex < 0)
+		mindex = getmonitorindex_nearest(xattr.width, xattr.height, xattr.x, xattr.y);
+	adjustmonitorfontsize(mindex);
+}
+
+
 void
 xbell(void)
 {
@@ -1833,7 +1990,7 @@ void
 kpress(XEvent *ev)
 {
 	XKeyEvent *e = &ev->xkey;
-	KeySym ksym;
+	KeySym ksym = NoSymbol;
 	char buf[64], *customkey;
 	int len;
 	Rune c;
@@ -1843,10 +2000,13 @@ kpress(XEvent *ev)
 	if (IS_SET(MODE_KBDLOCK))
 		return;
 
-	if (xw.ime.xic)
+	if (xw.ime.xic) {
 		len = XmbLookupString(xw.ime.xic, e, buf, sizeof buf, &ksym, &status);
-	else
+		if (status == XBufferOverflow)
+			return;
+	} else {
 		len = XLookupString(e, buf, sizeof buf, &ksym, NULL);
+	}
 	/* 1. shortcuts */
 	for (bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
 		if (ksym == bp->keysym && match(bp->mod, e->state)) {
@@ -1902,6 +2062,14 @@ cmessage(XEvent *e)
 void
 resize(XEvent *e)
 {
+	// BAD: no resize on monitor plug/unplug/reconfigure -- until window itself is kept in the same place
+	// NOTE: no resize event on zoomabs()
+	// fprintf(stderr, "Resize: %dx%d+%d+%d\n",
+	//     e->xconfigure.width, e->xconfigure.height, e->xconfigure.x, e->xconfigure.y);
+
+	adjustmonitorfontsize(getmonitorindex_threshold(
+	    e->xconfigure.width, e->xconfigure.height, e->xconfigure.x, e->xconfigure.y));
+
 	if (e->xconfigure.width == win.w && e->xconfigure.height == win.h)
 		return;
 
@@ -1934,6 +2102,22 @@ run(void)
 		}
 	} while (ev.type != MapNotify);
 
+	int rr_event_base, rr_error_base, rr_major, rr_minor;
+	if (!XRRQueryExtension (xw.dpy, &rr_event_base, &rr_error_base) ||
+	    !XRRQueryVersion (xw.dpy, &rr_major, &rr_minor) ||
+	    rr_major < 1 || (rr_major == 1 && rr_minor < 5))
+	{
+		die("RandR 1.5 extension isn't available\n");
+	}
+	XRRSelectInput(xw.dpy, xw.win, RRCrtcChangeNotifyMask);
+
+	// WARN: can query actual window size/pos only after window is mapped and its width/height are adjusted by WM
+	//  * x/y are WM-dependent and can't be determined beforehand anyway
+	//  * defaultfontsize isn't available until font is loaded and actual Fc*() size queried
+	// BAD: fonts on startup are always reloaded -- how to specify their size beforehand ?
+	FcPatternGetDouble(dc.font.match->pattern, FC_SIZE, 0, &defaultrelfontsize);
+	refreshxrandr(0);
+
 	ttyfd = ttynew(opt_line, shell, opt_io, opt_cmd);
 	cresize(w, h);
 
@@ -1965,6 +2149,16 @@ run(void)
 			XNextEvent(xw.dpy, &ev);
 			if (XFilterEvent(&ev, None))
 				continue;
+			if (LASTEvent <= ev.type) {
+				if (rr_event_base + RRNotify == ev.type &&
+					RRNotify_CrtcChange == ((XRRNotifyEvent *)&ev)->subtype)
+				{
+					XRRUpdateConfiguration(&ev);
+					// fprintf(stderr, "Monitor change: %d > %d\n", rr_event_base, LASTEvent);
+					refreshxrandr(0);
+				}
+				continue;
+			}
 			if (handler[ev.type])
 				(handler[ev.type])(&ev);
 		}