add custom todo

Mouse Scrollback Tweak, Font Tweak, Updated XK_Key for Prior/Next over PgUp PgDown

.gitignore

@@ -0,0 +1,6 @@
+st.o
+st
+x.o
+config.h
+*.orig
+*.rej

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "C_Cpp.errorSquiggles": "disabled"
+}

USER_TODO

@@ -0,0 +1,13 @@
+Implement Toggle Layers
+    AltR + AltL to cycle Layers
+    default layer
+    navigational layer
+        I   >   Arrow Up
+        K   >   Arrow Down
+        J   >   Arrow Left
+        L   >   Arrow Right
+
+        SHIFT +
+        I   >   Page Up
+        K   >   Page Down
+                

config.def.h

@@ -5,7 +5,7 @@
  *
  * font: see http://freedesktop.org/software/fontconfig/fontconfig-user.html
  */
-static char *font = "Liberation Mono:pixelsize=12:antialias=true:autohint=true";
+static char *font = "Hack Nerd Font Mono:pixelsize=12:antialias=true:autohint=true";
 static int borderpx = 2;
 
 /*
@@ -16,7 +16,7 @@ static int borderpx = 2;
  * 4: value of shell in /etc/passwd
  * 5: value of shell in config.h
  */
-static char *shell = "/bin/sh";
+static char *shell = "/bin/bash";
 char *utmp = NULL;
 /* scroll program: to enable use a string like "scroll" */
 char *scroll = NULL;
@@ -93,6 +93,9 @@ char *termname = "st-256color";
  */
 unsigned int tabspaces = 8;
 
+/* bg opacity */
+float alpha = 0.8;
+
 /* Terminal colors (16 first used in escape sequence) */
 static const char *colorname[] = {
 	/* 8 normal colors */
@@ -201,6 +204,10 @@ static Shortcut shortcuts[] = {
 	{ TERMMOD,              XK_Y,           selpaste,       {.i =  0} },
 	{ ShiftMask,            XK_Insert,      selpaste,       {.i =  0} },
 	{ TERMMOD,              XK_Num_Lock,    numlock,        {.i =  0} },
+	{ ShiftMask,            XK_Prior,     kscrollup,      {.i = -1} },
+    { ShiftMask,            XK_Next,   kscrolldown,    {.i = -1} },
+	{ ShiftMask,            Button4, kscrollup,      {.i = 1} },
+	{ ShiftMask,            Button5, kscrolldown,    {.i = 1} },
 };
 
 /*

patches/st-focus-20230610-68d1ad9.diff

@@ -0,0 +1,538 @@
+From e08d495aaa29c53273942985f40212ef72715604 Mon Sep 17 00:00:00 2001
+From: Julius Huelsmann <juliusHuelsmann@gmail.com>
+Date: Sat, 30 May 2020 01:11:42 +0200
+Subject: [PATCH 1/7] chore: add alpha patch
+
+---
+ config.def.h | 11 +++++++----
+ config.mk    |  2 +-
+ st.h         |  1 +
+ x.c          | 40 ++++++++++++++++++++++++++++++----------
+ 4 files changed, 39 insertions(+), 15 deletions(-)
+
+diff --git a/config.def.h b/config.def.h
+index 91ab8ca..6bd6e8d 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -93,6 +93,9 @@ char *termname = "st-256color";
+  */
+ unsigned int tabspaces = 8;
+ 
++/* bg opacity */
++float alpha = 0.8;
++
+ /* Terminal colors (16 first used in escape sequence) */
+ static const char *colorname[] = {
+ 	/* 8 normal colors */
+@@ -120,8 +123,7 @@ static const char *colorname[] = {
+ 	/* more colors can be added after 255 to use with DefaultXX */
+ 	"#cccccc",
+ 	"#555555",
+-	"gray90", /* default foreground colour */
+-	"black", /* default background colour */
++	"black",
+ };
+ 
+ 
+@@ -129,8 +131,9 @@ static const char *colorname[] = {
+  * Default colors (colorname index)
+  * foreground, background, cursor, reverse cursor
+  */
+-unsigned int defaultfg = 258;
+-unsigned int defaultbg = 259;
++unsigned int defaultfg = 7;
++unsigned int defaultbg = 258;
++//static 
+ unsigned int defaultcs = 256;
+ static unsigned int defaultrcs = 257;
+ 
+diff --git a/config.mk b/config.mk
+index 1e306f8..47c615e 100644
+--- a/config.mk
++++ b/config.mk
+@@ -16,7 +16,7 @@ PKG_CONFIG = pkg-config
+ INCS = -I$(X11INC) \
+        `$(PKG_CONFIG) --cflags fontconfig` \
+        `$(PKG_CONFIG) --cflags freetype2`
+-LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
++LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft -lXrender\
+        `$(PKG_CONFIG) --libs fontconfig` \
+        `$(PKG_CONFIG) --libs freetype2`
+ 
+diff --git a/st.h b/st.h
+index fd3b0d8..9f91e2a 100644
+--- a/st.h
++++ b/st.h
+@@ -124,3 +124,4 @@ extern unsigned int tabspaces;
+ extern unsigned int defaultfg;
+ extern unsigned int defaultbg;
+ extern unsigned int defaultcs;
++extern float alpha;
+diff --git a/x.c b/x.c
+index 2a3bd38..27e81d1 100644
+--- a/x.c
++++ b/x.c
+@@ -105,6 +105,7 @@ typedef struct {
+ 	XSetWindowAttributes attrs;
+ 	int scr;
+ 	int isfixed; /* is fixed geometry? */
++	int depth; /* bit depth */
+ 	int l, t; /* left and top offset */
+ 	int gm; /* geometry mask */
+ } XWindow;
+@@ -243,6 +244,7 @@ static char *usedfont = NULL;
+ static double usedfontsize = 0;
+ static double defaultfontsize = 0;
+ 
++static char *opt_alpha = NULL;
+ static char *opt_class = NULL;
+ static char **opt_cmd  = NULL;
+ static char *opt_embed = NULL;
+@@ -752,7 +754,7 @@ xresize(int col, int row)
+ 
+ 	XFreePixmap(xw.dpy, xw.buf);
+ 	xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
+-			DefaultDepth(xw.dpy, xw.scr));
++			xw.depth);
+ 	XftDrawChange(xw.draw, xw.buf);
+ 	xclear(0, 0, win.w, win.h);
+ 
+@@ -812,6 +814,13 @@ xloadcols(void)
+ 			else
+ 				die("could not allocate color %d\n", i);
+ 		}
++
++	/* set alpha value of bg color */
++	if (opt_alpha)
++		alpha = strtof(opt_alpha, NULL);
++	dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
++	dc.col[defaultbg].pixel &= 0x00FFFFFF;
++	dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
+ 	loaded = 1;
+ }
+ 
+@@ -1134,11 +1143,23 @@ xinit(int cols, int rows)
+ 	Window parent;
+ 	pid_t thispid = getpid();
+ 	XColor xmousefg, xmousebg;
++	XWindowAttributes attr;
++	XVisualInfo vis;
+ 
+ 	if (!(xw.dpy = XOpenDisplay(NULL)))
+ 		die("can't open display\n");
+ 	xw.scr = XDefaultScreen(xw.dpy);
+-	xw.vis = XDefaultVisual(xw.dpy, xw.scr);
++
++	if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0)))) {
++		parent = XRootWindow(xw.dpy, xw.scr);
++		xw.depth = 32;
++	} else {
++		XGetWindowAttributes(xw.dpy, parent, &attr);
++		xw.depth = attr.depth;
++	}
++
++	XMatchVisualInfo(xw.dpy, xw.scr, xw.depth, TrueColor, &vis);
++	xw.vis = vis.visual;
+ 
+ 	/* font */
+ 	if (!FcInit())
+@@ -1148,7 +1169,7 @@ xinit(int cols, int rows)
+ 	xloadfonts(usedfont, 0);
+ 
+ 	/* colors */
+-	xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
++	xw.cmap = XCreateColormap(xw.dpy, parent, xw.vis, None);
+ 	xloadcols();
+ 
+ 	/* adjust fixed window geometry */
+@@ -1168,19 +1189,15 @@ xinit(int cols, int rows)
+ 		| ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
+ 	xw.attrs.colormap = xw.cmap;
+ 
+-	if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
+-		parent = XRootWindow(xw.dpy, xw.scr);
+ 	xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
+-			win.w, win.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
++			win.w, win.h, 0, xw.depth, InputOutput,
+ 			xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
+ 			| CWEventMask | CWColormap, &xw.attrs);
+ 
+ 	memset(&gcvalues, 0, sizeof(gcvalues));
+ 	gcvalues.graphics_exposures = False;
+-	dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
+-			&gcvalues);
+-	xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
+-			DefaultDepth(xw.dpy, xw.scr));
++	xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h, xw.depth);
++	dc.gc = XCreateGC(xw.dpy, xw.buf, GCGraphicsExposures, &gcvalues);
+ 	XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
+ 	XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
+ 
+@@ -2035,6 +2052,9 @@ main(int argc, char *argv[])
+ 	case 'a':
+ 		allowaltscreen = 0;
+ 		break;
++	case 'A':
++		opt_alpha = EARGF(usage());
++		break;
+ 	case 'c':
+ 		opt_class = EARGF(usage());
+ 		break;
+-- 
+2.34.1
+
+
+From 292b70d7b9976e624931f8ec264a8875e29d2f3c Mon Sep 17 00:00:00 2001
+From: Julius Huelsmann <juliusHuelsmann@gmail.com>
+Date: Sat, 30 May 2020 01:13:35 +0200
+Subject: [PATCH 2/7] [patch:focus] add initial patch
+
+---
+ config.def.h |  6 +++---
+ st.h         |  2 +-
+ x.c          | 33 +++++++++++++++++++--------------
+ 3 files changed, 23 insertions(+), 18 deletions(-)
+
+diff --git a/config.def.h b/config.def.h
+index 6bd6e8d..cdfbaf1 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -94,7 +94,7 @@ char *termname = "st-256color";
+ unsigned int tabspaces = 8;
+ 
+ /* bg opacity */
+-float alpha = 0.8;
++float alpha = 0.8, alphaUnfocused = 0.6;
+ 
+ /* Terminal colors (16 first used in escape sequence) */
+ static const char *colorname[] = {
+@@ -132,10 +132,10 @@ static const char *colorname[] = {
+  * foreground, background, cursor, reverse cursor
+  */
+ unsigned int defaultfg = 7;
+-unsigned int defaultbg = 258;
+-//static 
++unsigned int defaultbg = 0;
+ unsigned int defaultcs = 256;
+ static unsigned int defaultrcs = 257;
++unsigned int bg = 17, bgUnfocused = 16;
+ 
+ /*
+  * Default shape of cursor
+diff --git a/st.h b/st.h
+index 9f91e2a..62e3486 100644
+--- a/st.h
++++ b/st.h
+@@ -124,4 +124,4 @@ extern unsigned int tabspaces;
+ extern unsigned int defaultfg;
+ extern unsigned int defaultbg;
+ extern unsigned int defaultcs;
+-extern float alpha;
++extern float alpha, alphaUnfocused;
+diff --git a/x.c b/x.c
+index 27e81d1..05d6e2e 100644
+--- a/x.c
++++ b/x.c
+@@ -255,6 +255,7 @@ static char *opt_name  = NULL;
+ static char *opt_title = NULL;
+ 
+ static uint buttons; /* bit field of pressed buttons */
++static int focused = 0;
+ 
+ void
+ clipcopy(const Arg *dummy)
+@@ -792,35 +793,38 @@ xloadcolor(int i, const char *name, Color *ncolor)
+ 	return XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, ncolor);
+ }
+ 
++void
++xloadalpha(void)
++{
++	float const usedAlpha = focused ? alpha : alphaUnfocused;
++	if (opt_alpha) alpha = strtof(opt_alpha, NULL);
++	dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * usedAlpha);
++	dc.col[defaultbg].pixel &= 0x00FFFFFF;
++	dc.col[defaultbg].pixel |= (unsigned char)(0xff * usedAlpha) << 24;
++}
++
+ 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));
++	if (!loaded) {
++		dc.collen = 1 + (defaultbg = MAX(LEN(colorname), 256));
++		dc.col = xmalloc((dc.collen) * sizeof(Color));
+ 	}
+ 
+-	for (i = 0; i < dc.collen; i++)
++	for (int i = 0; i+1 < 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);
+ 		}
++	if (dc.collen) // cannot die, as the color is already loaded.
++		xloadcolor(focused ?bg :bgUnfocused, NULL, &dc.col[defaultbg]);
+ 
+-	/* set alpha value of bg color */
+-	if (opt_alpha)
+-		alpha = strtof(opt_alpha, NULL);
+-	dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
+-	dc.col[defaultbg].pixel &= 0x00FFFFFF;
+-	dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
++	xloadalpha();
+ 	loaded = 1;
+ }
+ 
+@@ -2106,6 +2110,7 @@ run:
+ 	XSetLocaleModifiers("");
+ 	cols = MAX(cols, 1);
+ 	rows = MAX(rows, 1);
++	defaultbg = MAX(LEN(colorname), 256);
+ 	tnew(cols, rows);
+ 	xinit(cols, rows);
+ 	xsetenv();
+-- 
+2.34.1
+
+
+From 9bb6788325306d9ec2bead559dacd031287a2b8c Mon Sep 17 00:00:00 2001
+From: Julius Huelsmann <juliusHuelsmann@gmail.com>
+Date: Fri, 5 Jun 2020 20:48:06 +0200
+Subject: [PATCH 3/7] [patch:focus]: fix
+
+---
+ x.c | 10 ++++++++++
+ 1 file changed, 10 insertions(+)
+
+diff --git a/x.c b/x.c
+index 05d6e2e..97481ba 100644
+--- a/x.c
++++ b/x.c
+@@ -1798,12 +1798,22 @@ focus(XEvent *ev)
+ 		xseturgency(0);
+ 		if (IS_SET(MODE_FOCUS))
+ 			ttywrite("\033[I", 3, 0);
++		if (!focused) {
++			xloadcols();
++			redraw();
++		}
++		focused = 1;
+ 	} else {
+ 		if (xw.ime.xic)
+ 			XUnsetICFocus(xw.ime.xic);
+ 		win.mode &= ~MODE_FOCUSED;
+ 		if (IS_SET(MODE_FOCUS))
+ 			ttywrite("\033[O", 3, 0);
++		if (focused) {
++			xloadcols();
++			redraw();
++		}
++		focused = 0;
+ 	}
+ }
+ 
+-- 
+2.34.1
+
+
+From 62b6683ddf40aff222b59d5e074770d8d7336342 Mon Sep 17 00:00:00 2001
+From: Julius Huelsmann <juliusHuelsmann@gmail.com>
+Date: Sat, 6 Jun 2020 12:57:43 +0200
+Subject: [PATCH 4/7] [patch:focus]: fix
+
+---
+ x.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/x.c b/x.c
+index 97481ba..c4a4b00 100644
+--- a/x.c
++++ b/x.c
+@@ -1799,10 +1799,10 @@ focus(XEvent *ev)
+ 		if (IS_SET(MODE_FOCUS))
+ 			ttywrite("\033[I", 3, 0);
+ 		if (!focused) {
++			focused = 1;
+ 			xloadcols();
+ 			redraw();
+ 		}
+-		focused = 1;
+ 	} else {
+ 		if (xw.ime.xic)
+ 			XUnsetICFocus(xw.ime.xic);
+@@ -1810,10 +1810,10 @@ focus(XEvent *ev)
+ 		if (IS_SET(MODE_FOCUS))
+ 			ttywrite("\033[O", 3, 0);
+ 		if (focused) {
++			focused = 0;
+ 			xloadcols();
+ 			redraw();
+ 		}
+-		focused = 0;
+ 	}
+ }
+ 
+-- 
+2.34.1
+
+
+From dc6c039192e887e70a2e6f07ac55c317e6b1c3be Mon Sep 17 00:00:00 2001
+From: Julius Huelsmann <juliusHuelsmann@gmail.com>
+Date: Thu, 23 Jul 2020 18:17:50 +0200
+Subject: [PATCH 5/7] potential fix: exchange redraw with tfulldirt
+
+---
+ st.c | 1 -
+ st.h | 1 +
+ x.c  | 4 ++--
+ 3 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/st.c b/st.c
+index 62def59..8ee76a3 100644
+--- a/st.c
++++ b/st.c
+@@ -194,7 +194,6 @@ static void tsetscroll(int, int);
+ static void tswapscreen(void);
+ static void tsetmode(int, int, const int *, int);
+ static int twrite(const char *, int, int);
+-static void tfulldirt(void);
+ static void tcontrolcode(uchar );
+ static void tdectest(char );
+ static void tdefutf8(char);
+diff --git a/st.h b/st.h
+index 62e3486..13be339 100644
+--- a/st.h
++++ b/st.h
+@@ -79,6 +79,7 @@ typedef union {
+ 
+ void die(const char *, ...);
+ void redraw(void);
++void tfulldirt(void);
+ void draw(void);
+ 
+ void printscreen(const Arg *);
+diff --git a/x.c b/x.c
+index c4a4b00..92c87b4 100644
+--- a/x.c
++++ b/x.c
+@@ -1801,7 +1801,7 @@ focus(XEvent *ev)
+ 		if (!focused) {
+ 			focused = 1;
+ 			xloadcols();
+-			redraw();
++			tfulldirt();
+ 		}
+ 	} else {
+ 		if (xw.ime.xic)
+@@ -1812,7 +1812,7 @@ focus(XEvent *ev)
+ 		if (focused) {
+ 			focused = 0;
+ 			xloadcols();
+-			redraw();
++			tfulldirt();
+ 		}
+ 	}
+ }
+-- 
+2.34.1
+
+
+From 4da97936d57e3528ef7cf36c254c0985f6640132 Mon Sep 17 00:00:00 2001
+From: Wim Stockman <wim@yasendfile.org>
+Date: Sat, 4 Feb 2023 13:46:02 +0100
+Subject: [PATCH 6/7] Performs upgrade avoid reloading all the colors again and
+ again also avoids problem when colors are set dynamically when focus in and
+ out that the colourpallette is not reset each time.
+
+---
+ x.c | 7 +++----
+ 1 file changed, 3 insertions(+), 4 deletions(-)
+
+diff --git a/x.c b/x.c
+index 92c87b4..879bf0e 100644
+--- a/x.c
++++ b/x.c
+@@ -796,6 +796,7 @@ xloadcolor(int i, const char *name, Color *ncolor)
+ void
+ xloadalpha(void)
+ {
++	xloadcolor(focused ?bg :bgUnfocused, NULL, &dc.col[defaultbg]);
+ 	float const usedAlpha = focused ? alpha : alphaUnfocused;
+ 	if (opt_alpha) alpha = strtof(opt_alpha, NULL);
+ 	dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * usedAlpha);
+@@ -821,8 +822,6 @@ xloadcols(void)
+ 			else
+ 				die("could not allocate color %d\n", i);
+ 		}
+-	if (dc.collen) // cannot die, as the color is already loaded.
+-		xloadcolor(focused ?bg :bgUnfocused, NULL, &dc.col[defaultbg]);
+ 
+ 	xloadalpha();
+ 	loaded = 1;
+@@ -1800,7 +1799,7 @@ focus(XEvent *ev)
+ 			ttywrite("\033[I", 3, 0);
+ 		if (!focused) {
+ 			focused = 1;
+-			xloadcols();
++			xloadalpha();
+ 			tfulldirt();
+ 		}
+ 	} else {
+@@ -1811,7 +1810,7 @@ focus(XEvent *ev)
+ 			ttywrite("\033[O", 3, 0);
+ 		if (focused) {
+ 			focused = 0;
+-			xloadcols();
++			xloadalpha();
+ 			tfulldirt();
+ 		}
+ 	}
+-- 
+2.34.1
+
+
+From ec16984d95e0ff9ac33b2b3d30f292c3a327c473 Mon Sep 17 00:00:00 2001
+From: Julius Huelsmann <juliusHuelsmann@gmail.com>
+Date: Sat, 10 Jun 2023 13:16:11 +0200
+Subject: [PATCH 7/7] changed default config a bit
+
+---
+ config.def.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/config.def.h b/config.def.h
+index cdfbaf1..779178f 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -94,7 +94,7 @@ char *termname = "st-256color";
+ unsigned int tabspaces = 8;
+ 
+ /* bg opacity */
+-float alpha = 0.8, alphaUnfocused = 0.6;
++float alpha = 0.93, alphaUnfocused = 0.6;
+ 
+ /* Terminal colors (16 first used in escape sequence) */
+ static const char *colorname[] = {
+@@ -135,7 +135,7 @@ unsigned int defaultfg = 7;
+ unsigned int defaultbg = 0;
+ unsigned int defaultcs = 256;
+ static unsigned int defaultrcs = 257;
+-unsigned int bg = 17, bgUnfocused = 16;
++unsigned int bg = 0, bgUnfocused = 16;
+ 
+ /*
+  * Default shape of cursor
+-- 
+2.34.1
+

st.c

@@ -35,6 +35,7 @@
 #define ESC_ARG_SIZ   16
 #define STR_BUF_SIZ   ESC_BUF_SIZ
 #define STR_ARG_SIZ   ESC_ARG_SIZ
+#define HISTSIZE      2000
 
 /* macros */
 #define IS_SET(flag)		((term.mode & (flag)) != 0)
@@ -42,6 +43,9 @@
 #define ISCONTROLC1(c)		(BETWEEN(c, 0x80, 0x9f))
 #define ISCONTROL(c)		(ISCONTROLC0(c) || ISCONTROLC1(c))
 #define ISDELIM(u)		(u && wcschr(worddelimiters, u))
+#define TLINE(y)		((y) < term.scr ? term.hist[((y) + term.histi - \
+            term.scr + HISTSIZE + 1) % HISTSIZE] : \
+            term.line[(y) - term.scr])
 
 enum term_mode {
 	MODE_WRAP        = 1 << 0,
@@ -115,6 +119,9 @@ typedef struct {
 	int col;      /* nb col */
 	Line *line;   /* screen */
 	Line *alt;    /* alternate screen */
+	Line hist[HISTSIZE]; /* history buffer */
+	int histi;    /* history index */
+	int scr;      /* scroll back */
 	int *dirty;   /* dirtyness of lines */
 	TCursor c;    /* cursor */
 	int ocx;      /* old cursor col */
@@ -185,8 +192,8 @@ static void tnewline(int);
 static void tputtab(int);
 static void tputc(Rune);
 static void treset(void);
-static void tscrollup(int, int);
+static void tscrollup(int, int, int);
-static void tscrolldown(int, int);
+static void tscrolldown(int, int, int);
 static void tsetattr(const int *, int);
 static void tsetchar(Rune, const Glyph *, int, int);
 static void tsetdirt(int, int);
@@ -409,10 +416,10 @@ tlinelen(int y)
 {
 	int i = term.col;
 
-	if (term.line[y][i - 1].mode & ATTR_WRAP)
+	if (TLINE(y)[i - 1].mode & ATTR_WRAP)
 		return i;
 
-	while (i > 0 && term.line[y][i - 1].u == ' ')
+	while (i > 0 && TLINE(y)[i - 1].u == ' ')
 		--i;
 
 	return i;
@@ -521,7 +528,7 @@ selsnap(int *x, int *y, int direction)
 		 * Snap around if the word wraps around at the end or
 		 * beginning of a line.
 		 */
-		prevgp = &term.line[*y][*x];
+		prevgp = &TLINE(*y)[*x];
 		prevdelim = ISDELIM(prevgp->u);
 		for (;;) {
 			newx = *x + direction;
@@ -536,14 +543,14 @@ selsnap(int *x, int *y, int direction)
 					yt = *y, xt = *x;
 				else
 					yt = newy, xt = newx;
-				if (!(term.line[yt][xt].mode & ATTR_WRAP))
+				if (!(TLINE(yt)[xt].mode & ATTR_WRAP))
 					break;
 			}
 
 			if (newx >= tlinelen(newy))
 				break;
 
-			gp = &term.line[newy][newx];
+			gp = &TLINE(newy)[newx];
 			delim = ISDELIM(gp->u);
 			if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 					|| (delim && gp->u != prevgp->u)))
@@ -564,14 +571,14 @@ selsnap(int *x, int *y, int direction)
 		*x = (direction < 0) ? 0 : term.col - 1;
 		if (direction < 0) {
 			for (; *y > 0; *y += direction) {
-				if (!(term.line[*y-1][term.col-1].mode
+				if (!(TLINE(*y-1)[term.col-1].mode
 						& ATTR_WRAP)) {
 					break;
 				}
 			}
 		} else if (direction > 0) {
 			for (; *y < term.row-1; *y += direction) {
-				if (!(term.line[*y][term.col-1].mode
+				if (!(TLINE(*y)[term.col-1].mode
 						& ATTR_WRAP)) {
 					break;
 				}
@@ -602,13 +609,13 @@ getsel(void)
 		}
 
 		if (sel.type == SEL_RECTANGULAR) {
-			gp = &term.line[y][sel.nb.x];
+			gp = &TLINE(y)[sel.nb.x];
 			lastx = sel.ne.x;
 		} else {
-			gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
+			gp = &TLINE(y)[sel.nb.y == y ? sel.nb.x : 0];
 			lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 		}
-		last = &term.line[y][MIN(lastx, linelen-1)];
+		last = &TLINE(y)[MIN(lastx, linelen-1)];
 		while (last >= gp && last->u == ' ')
 			--last;
 
@@ -844,6 +851,9 @@ void
 ttywrite(const char *s, size_t n, int may_echo)
 {
 	const char *next;
+	Arg arg = (Arg) { .i = term.scr };
+
+	kscrolldown(&arg);
 
 	if (may_echo && IS_SET(MODE_ECHO))
 		twrite(s, n, 1);
@@ -1055,13 +1065,53 @@ tswapscreen(void)
 }
 
 void
-tscrolldown(int orig, int n)
+kscrolldown(const Arg* a)
+{
+	int n = a->i;
+
+	if (n < 0)
+		n = term.row + n;
+
+	if (n > term.scr)
+		n = term.scr;
+
+	if (term.scr > 0) {
+		term.scr -= n;
+		selscroll(0, -n);
+		tfulldirt();
+	}
+}
+
+void
+kscrollup(const Arg* a)
+{
+	int n = a->i;
+
+	if (n < 0)
+		n = term.row + n;
+
+	if (term.scr <= HISTSIZE-n) {
+		term.scr += n;
+		selscroll(0, n);
+		tfulldirt();
+	}
+}
+
+void
+tscrolldown(int orig, int n, int copyhist)
 {
 	int i;
 	Line temp;
 
 	LIMIT(n, 0, term.bot-orig+1);
 
+	if (copyhist) {
+		term.histi = (term.histi - 1 + HISTSIZE) % HISTSIZE;
+		temp = term.hist[term.histi];
+		term.hist[term.histi] = term.line[term.bot];
+		term.line[term.bot] = temp;
+	}
+
 	tsetdirt(orig, term.bot-n);
 	tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 
@@ -1071,17 +1121,28 @@ tscrolldown(int orig, int n)
 		term.line[i-n] = temp;
 	}
 
-	selscroll(orig, n);
+	if (term.scr == 0)
+		selscroll(orig, n);
 }
 
 void
-tscrollup(int orig, int n)
+tscrollup(int orig, int n, int copyhist)
 {
 	int i;
 	Line temp;
 
 	LIMIT(n, 0, term.bot-orig+1);
 
+	if (copyhist) {
+		term.histi = (term.histi + 1) % HISTSIZE;
+		temp = term.hist[term.histi];
+		term.hist[term.histi] = term.line[orig];
+		term.line[orig] = temp;
+	}
+
+	if (term.scr > 0 && term.scr < HISTSIZE)
+		term.scr = MIN(term.scr + n, HISTSIZE-1);
+
 	tclearregion(0, orig, term.col-1, orig+n-1);
 	tsetdirt(orig+n, term.bot);
 
@@ -1091,7 +1152,8 @@ tscrollup(int orig, int n)
 		term.line[i+n] = temp;
 	}
 
-	selscroll(orig, -n);
+	if (term.scr == 0)
+		selscroll(orig, -n);
 }
 
 void
@@ -1120,7 +1182,7 @@ tnewline(int first_col)
 	int y = term.c.y;
 
 	if (y == term.bot) {
-		tscrollup(term.top, 1);
+		tscrollup(term.top, 1, 1);
 	} else {
 		y++;
 	}
@@ -1288,14 +1350,14 @@ void
 tinsertblankline(int n)
 {
 	if (BETWEEN(term.c.y, term.top, term.bot))
-		tscrolldown(term.c.y, n);
+		tscrolldown(term.c.y, n, 0);
 }
 
 void
 tdeleteline(int n)
 {
 	if (BETWEEN(term.c.y, term.top, term.bot))
-		tscrollup(term.c.y, n);
+		tscrollup(term.c.y, n, 0);
 }
 
 int32_t
@@ -1733,11 +1795,11 @@ csihandle(void)
 	case 'S': /* SU -- Scroll <n> line up */
 		if (csiescseq.priv) break;
 		DEFAULT(csiescseq.arg[0], 1);
-		tscrollup(term.top, csiescseq.arg[0]);
+		tscrollup(term.top, csiescseq.arg[0], 0);
 		break;
 	case 'T': /* SD -- Scroll <n> line down */
 		DEFAULT(csiescseq.arg[0], 1);
-		tscrolldown(term.top, csiescseq.arg[0]);
+		tscrolldown(term.top, csiescseq.arg[0], 0);
 		break;
 	case 'L': /* IL -- Insert <n> blank lines */
 		DEFAULT(csiescseq.arg[0], 1);
@@ -2313,7 +2375,7 @@ eschandle(uchar ascii)
 		return 0;
 	case 'D': /* IND -- Linefeed */
 		if (term.c.y == term.bot) {
-			tscrollup(term.top, 1);
+			tscrollup(term.top, 1, 1);
 		} else {
 			tmoveto(term.c.x, term.c.y+1);
 		}
@@ -2326,7 +2388,7 @@ eschandle(uchar ascii)
 		break;
 	case 'M': /* RI -- Reverse index */
 		if (term.c.y == term.top) {
-			tscrolldown(term.top, 1);
+			tscrolldown(term.top, 1, 1);
 		} else {
 			tmoveto(term.c.x, term.c.y-1);
 		}
@@ -2549,7 +2611,7 @@ twrite(const char *buf, int buflen, int show_ctrl)
 void
 tresize(int col, int row)
 {
-	int i;
+	int i, j;
 	int minrow = MIN(row, term.row);
 	int mincol = MIN(col, term.col);
 	int *bp;
@@ -2586,6 +2648,14 @@ tresize(int col, int row)
 	term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
 	term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
 
+	for (i = 0; i < HISTSIZE; i++) {
+		term.hist[i] = xrealloc(term.hist[i], col * sizeof(Glyph));
+		for (j = mincol; j < col; j++) {
+			term.hist[i][j] = term.c.attr;
+			term.hist[i][j].u = ' ';
+		}
+	}
+
 	/* resize each row to new width, zero-pad if needed */
 	for (i = 0; i < minrow; i++) {
 		term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
@@ -2644,7 +2714,7 @@ drawregion(int x1, int y1, int x2, int y2)
 			continue;
 
 		term.dirty[y] = 0;
-		xdrawline(term.line[y], x1, y, x2);
+		xdrawline(TLINE(y), x1, y, x2);
 	}
 }
 
@@ -2665,8 +2735,9 @@ draw(void)
 		cx--;
 
 	drawregion(0, 0, term.col, term.row);
-	xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
+	if (term.scr == 0)
-			term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
+		xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
+				term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
 	term.ocx = cx;
 	term.ocy = term.c.y;
 	xfinishdraw();

st.h

@@ -81,6 +81,8 @@ void die(const char *, ...);
 void redraw(void);
 void draw(void);
 
+void kscrolldown(const Arg *);
+void kscrollup(const Arg *);
 void printscreen(const Arg *);
 void printsel(const Arg *);
 void sendbreak(const Arg *);

x.c

@@ -105,6 +105,7 @@ typedef struct {
 	XSetWindowAttributes attrs;
 	int scr;
 	int isfixed; /* is fixed geometry? */
+	int depth; /* bit depth */
 	int l, t; /* left and top offset */
 	int gm; /* geometry mask */
 } XWindow;
@@ -686,6 +687,7 @@ setsel(char *str, Time t)
 	XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
 	if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
 		selclear();
+	clipcopy(NULL);
 }
 
 void
@@ -752,7 +754,7 @@ xresize(int col, int row)
 
 	XFreePixmap(xw.dpy, xw.buf);
 	xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
-			DefaultDepth(xw.dpy, xw.scr));
+			xw.depth);
 	XftDrawChange(xw.draw, xw.buf);
 	xclear(0, 0, win.w, win.h);
 
@@ -812,6 +814,10 @@ xloadcols(void)
 			else
 				die("could not allocate color %d\n", i);
 		}
+
+	dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
+	dc.col[defaultbg].pixel &= 0x00FFFFFF;
+	dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
 	loaded = 1;
 }
 
@@ -842,6 +848,12 @@ xsetcolorname(int x, const char *name)
 	XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
 	dc.col[x] = ncolor;
 
+	if (x == defaultbg) {
+		dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
+		dc.col[defaultbg].pixel &= 0x00FFFFFF;
+		dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
+	}
+
 	return 0;
 }
 
@@ -1134,11 +1146,25 @@ xinit(int cols, int rows)
 	Window parent, root;
 	pid_t thispid = getpid();
 	XColor xmousefg, xmousebg;
+	XWindowAttributes attr;
+	XVisualInfo vis;
 
 	if (!(xw.dpy = XOpenDisplay(NULL)))
 		die("can't open display\n");
 	xw.scr = XDefaultScreen(xw.dpy);
-	xw.vis = XDefaultVisual(xw.dpy, xw.scr);
+
+	root = XRootWindow(xw.dpy, xw.scr);
+	if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
+		parent = root;
+
+	if (XMatchVisualInfo(xw.dpy, xw.scr, 32, TrueColor, &vis) != 0) {
+		xw.vis = vis.visual;
+		xw.depth = vis.depth;
+	} else {
+		XGetWindowAttributes(xw.dpy, parent, &attr);
+		xw.vis = attr.visual;
+		xw.depth = attr.depth;
+	}
 
 	/* font */
 	if (!FcInit())
@@ -1148,7 +1174,7 @@ xinit(int cols, int rows)
 	xloadfonts(usedfont, 0);
 
 	/* colors */
-	xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
+	xw.cmap = XCreateColormap(xw.dpy, parent, xw.vis, None);
 	xloadcols();
 
 	/* adjust fixed window geometry */
@@ -1168,11 +1194,8 @@ xinit(int cols, int rows)
 		| ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
 	xw.attrs.colormap = xw.cmap;
 
-	root = XRootWindow(xw.dpy, xw.scr);
+	xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
-	if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
+			win.w, win.h, 0, xw.depth, InputOutput,
-		parent = root;
-	xw.win = XCreateWindow(xw.dpy, root, xw.l, xw.t,
-			win.w, win.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
 			xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
 			| CWEventMask | CWColormap, &xw.attrs);
 	if (parent != root)
@@ -1183,7 +1206,7 @@ xinit(int cols, int rows)
 	dc.gc = XCreateGC(xw.dpy, xw.win, GCGraphicsExposures,
 			&gcvalues);
 	xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
-			DefaultDepth(xw.dpy, xw.scr));
+			xw.depth);
 	XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
 	XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
 
@@ -2047,6 +2070,10 @@ main(int argc, char *argv[])
 	case 'a':
 		allowaltscreen = 0;
 		break;
+	case 'A':
+		alpha = strtof(EARGF(usage()), NULL);
+		LIMIT(alpha, 0.0, 1.0);
+		break;
 	case 'c':
 		opt_class = EARGF(usage());
 		break;