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st/patches/st-scrollback-20170104-c63a87c.diff

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diff --git a/config.def.h b/config.def.h
index a719e36..9b51988 100644
--- a/config.def.h
+++ b/config.def.h
@@ -178,6 +178,8 @@ static Shortcut shortcuts[] = {
{ MODKEY|ShiftMask, XK_V, clippaste, {.i = 0} },
{ MODKEY, XK_Num_Lock, numlock, {.i = 0} },
{ MODKEY, XK_Control_L, iso14755, {.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 fbcd9e0..64bc208 100644
--- a/st.c
+++ b/st.c
@@ -61,6 +61,7 @@ char *argv0;
#define XK_ANY_MOD UINT_MAX
#define XK_NO_MOD 0
#define XK_SWITCH_MOD (1<<13)
+#define histsize 2000
/* macros */
#define MIN(a, b) ((a) < (b) ? (a) : (b))
@@ -87,6 +88,8 @@ 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])
/* constants */
#define ISO14755CMD "dmenu -w %lu -p codepoint: </dev/null"
@@ -241,6 +244,9 @@ 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 */
XftGlyphFontSpec *specbuf; /* font spec buffer used for rendering */
TCursor c; /* cursor */
@@ -334,6 +340,8 @@ 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 *);
@@ -409,8 +417,8 @@ 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, int);
+static void tscrolldown(int, int, int);
static void tsetattr(int *, int);
static void tsetchar(Rune, Glyph *, int, int);
static void tsetscroll(int, int);
@@ -742,10 +750,10 @@ 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;
@@ -807,7 +815,7 @@ 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;
@@ -822,14 +830,14 @@ 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)))
@@ -850,14 +858,14 @@ 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;
}
@@ -1023,13 +1031,13 @@ 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;
@@ -1513,6 +1521,9 @@ ttyread(void)
if (buflen > 0)
memmove(buf, ptr, buflen);
+ if (term.scr > 0 && term.scr < histsize-1)
+ term.scr++;
+
return ret;
}
@@ -1522,6 +1533,9 @@ ttywrite(const char *s, size_t n)
fd_set wfd, rfd;
ssize_t r;
size_t lim = 256;
+ Arg arg = (Arg) { .i = term.scr };
+
+ kscrolldown(&arg);
/*
* Remember that we are using a pty, which might be a modem line.
@@ -1724,13 +1738,53 @@ 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);
@@ -1744,13 +1798,20 @@ tscrolldown(int orig, int 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;
+ }
+
tclearregion(0, orig, term.col-1, orig+n-1);
tsetdirt(orig+n, term.bot);
@@ -1799,7 +1860,7 @@ tnewline(int first_col)
int y = term.c.y;
if (y == term.bot) {
- tscrollup(term.top, 1);
+ tscrollup(term.top, 1, 1);
} else {
y++;
}
@@ -1964,14 +2025,14 @@ 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
@@ -2405,11 +2466,11 @@ 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], 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);
@@ -2945,7 +3006,7 @@ 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);
}
@@ -2958,7 +3019,7 @@ 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);
}
@@ -3145,7 +3206,7 @@ check_control_code:
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;
@@ -3185,6 +3246,14 @@ 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));
@@ -4112,11 +4181,11 @@ 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))
@@ -4136,7 +4205,9 @@ 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
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