diff --git a/config.def.h b/config.def.h
index bb5596e..2df4cbc 100644
--- a/config.def.h
+++ b/config.def.h
@@ -7,6 +7,7 @@
*/
static char font[] = "Liberation Mono:pixelsize=12:antialias=false:autohint=false";
static int borderpx = 2;
+static int histsize = 2000;
static char shell[] = "/bin/sh";
static char *utmp = NULL;
static char stty_args[] = "stty raw -echo -iexten echonl";
@@ -128,6 +129,8 @@ static Shortcut shortcuts[] = {
{ MODKEY|ShiftMask, XK_C, clipcopy, {.i = 0} },
{ MODKEY|ShiftMask, XK_V, clippaste, {.i = 0} },
{ MODKEY, XK_Num_Lock, numlock, {.i = 0} },
+ { ShiftMask, XK_Page_Up, kscrollup, {.i = -1} },
+ { ShiftMask, XK_Page_Down, kscrolldown, {.i = -1} },
};
/*
diff --git a/st.c b/st.c
index 0c6b9c3..ab56435 100644
--- a/st.c
+++ b/st.c
@@ -83,6 +83,8 @@ char *argv0;
#define TRUERED(x) (((x) & 0xff0000) >> 8)
#define TRUEGREEN(x) (((x) & 0xff00))
#define TRUEBLUE(x) (((x) & 0xff) << 8)
+#define TLINE(y) ((y) < term.scr ? term.hist[((y) + term.histi - term.scr \
+ + histsize + 1) % histsize] : term.line[(y) - term.scr])
enum glyph_attribute {
@@ -231,6 +233,9 @@ typedef struct {
int col; /* nb col */
Line *line; /* screen */
Line *alt; /* alternate screen */
+ Line *hist; /* history buffer */
+ int histi; /* history index */
+ int scr; /* scroll back */
bool *dirty; /* dirtyness of lines */
XftGlyphFontSpec *specbuf; /* font spec buffer used for rendering */
TCursor c; /* cursor */
@@ -324,6 +329,8 @@ typedef struct {
/* function definitions used in config.h */
static void clipcopy(const Arg *);
static void clippaste(const Arg *);
+static void kscrolldown(const Arg *);
+static void kscrollup(const Arg *);
static void numlock(const Arg *);
static void selpaste(const Arg *);
static void xzoom(const Arg *);
@@ -395,8 +402,8 @@ static void tputtab(int);
static void tputc(Rune);
static void treset(void);
static void tresize(int, int);
-static void tscrollup(int, int);
-static void tscrolldown(int, int);
+static void tscrollup(int, int, bool);
+static void tscrolldown(int, int, bool);
static void tsetattr(int *, int);
static void tsetchar(Rune, Glyph *, int, int);
static void tsetscroll(int, int);
@@ -682,10 +689,10 @@ int
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;
@@ -744,7 +751,7 @@ 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;
@@ -759,14 +766,14 @@ 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)))
@@ -787,14 +794,14 @@ 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;
}
@@ -953,13 +960,13 @@ getsel(void) {
linelen = tlinelen(y);
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;
@@ -1362,10 +1369,16 @@ ttyread(void) {
/* keep any uncomplete utf8 char for the next call */
memmove(buf, ptr, buflen);
+ if(term.scr > 0 && term.scr < histsize-1)
+ term.scr++;
}
void
ttywrite(const char *s, size_t n) {
+ Arg arg = (Arg){ .i = term.scr };
+
+ kscrolldown(&arg);
+
if(xwrite(cmdfd, s, n) == -1)
die("write error on tty: %s\n", strerror(errno));
}
@@ -1500,13 +1513,52 @@ 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, bool 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);
for(i = term.bot; i >= orig+n; i--) {
@@ -1519,12 +1571,19 @@ tscrolldown(int orig, int n) {
}
void
-tscrollup(int orig, int n) {
+tscrollup(int orig, int n, bool 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;
+ }
+
tclearregion(0, orig, term.col-1, orig+n-1);
tsetdirt(orig+n, term.bot);
@@ -1571,7 +1630,7 @@ tnewline(int first_col) {
int y = term.c.y;
if(y == term.bot) {
- tscrollup(term.top, 1);
+ tscrollup(term.top, 1, true);
} else {
y++;
}
@@ -1728,13 +1787,13 @@ tinsertblank(int n) {
void
tinsertblankline(int n) {
if(BETWEEN(term.c.y, term.top, term.bot))
- tscrolldown(term.c.y, n);
+ tscrolldown(term.c.y, n, false);
}
void
tdeleteline(int n) {
if(BETWEEN(term.c.y, term.top, term.bot))
- tscrollup(term.c.y, n);
+ tscrollup(term.c.y, n, false);
}
int32_t
@@ -2163,11 +2222,11 @@ csihandle(void) {
break;
case 'S': /* SU -- Scroll <n> line up */
DEFAULT(csiescseq.arg[0], 1);
- tscrollup(term.top, csiescseq.arg[0]);
+ tscrollup(term.top, csiescseq.arg[0], false);
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], false);
break;
case 'L': /* IL -- Insert <n> blank lines */
DEFAULT(csiescseq.arg[0], 1);
@@ -2617,7 +2676,7 @@ eschandle(uchar ascii) {
return 0;
case 'D': /* IND -- Linefeed */
if(term.c.y == term.bot) {
- tscrollup(term.top, 1);
+ tscrollup(term.top, 1, true);
} else {
tmoveto(term.c.x, term.c.y+1);
}
@@ -2630,7 +2689,7 @@ eschandle(uchar ascii) {
break;
case 'M': /* RI -- Reverse index */
if(term.c.y == term.top) {
- tscrolldown(term.top, 1);
+ tscrolldown(term.top, 1, true);
} else {
tmoveto(term.c.x, term.c.y-1);
}
@@ -2791,7 +2850,7 @@ tputc(Rune u) {
void
tresize(int col, int row) {
- int i;
+ int i, j;
int minrow = MIN(row, term.row);
int mincol = MIN(col, term.col);
bool *bp;
@@ -2828,9 +2887,18 @@ tresize(int col, int row) {
/* resize to new height */
term.line = xrealloc(term.line, row * sizeof(Line));
term.alt = xrealloc(term.alt, row * sizeof(Line));
+ term.hist = xrealloc(term.hist, histsize * sizeof(Line));
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));
@@ -3664,11 +3732,11 @@ drawregion(int x1, int y1, int x2, int y2) {
term.dirty[y] = 0;
specs = term.specbuf;
- numspecs = xmakeglyphfontspecs(specs, &term.line[y][x1], x2 - x1, x1, y);
+ numspecs = xmakeglyphfontspecs(specs, &TLINE(y)[x1], x2 - x1, x1, y);
i = ox = 0;
for(x = x1; x < x2 && i < numspecs; x++) {
- new = term.line[y][x];
+ new = TLINE(y)[x];
if(new.mode == ATTR_WDUMMY)
continue;
if(ena_sel && selected(x, y))
@@ -3688,7 +3756,8 @@ drawregion(int x1, int y1, int x2, int y2) {
if(i > 0)
xdrawglyphfontspecs(specs, base, i, ox, y);
}
- xdrawcursor();
+ if(term.scr == 0)
+ xdrawcursor();
}
void
