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columns-rows-reflow-st-unpatched-new.patch
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columns-rows-reflow-st-unpatched-new.patch
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From: João F. BeyondMagic <koetemagie@gmail.com>
Date: Tue, 27 Dec 2021
Subject: [PATCH] Patch to redraw columns and rows in
case of hidden by resize. Extracted from
https://github.com/ashish-yadav11/st @ashish-yadav11
diff --git a/st.c b/st.c
index a9338e1..e3b052d 100644
--- a/st.c
+++ b/st.c
@@ -35,6 +35,8 @@
#define ESC_ARG_SIZ 16
#define STR_BUF_SIZ ESC_BUF_SIZ
#define STR_ARG_SIZ ESC_ARG_SIZ
+#define HISTSIZE 2000
+#define RESIZEBUFFER 1000
/* macros */
#define IS_SET(flag) ((term.mode & (flag)) != 0)
@@ -42,6 +44,24 @@
#define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
#define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
#define ISDELIM(u) (u && wcschr(worddelimiters, u))
+#define STRESCARGREST(n) ((n) == 0 ? strescseq.buf : strescseq.args[(n)-1] + 1)
+#define STRESCARGJUST(n) (*(strescseq.args[n]) = '\0', STRESCARGREST(n))
+
+#define TLINE(y) ( \
+ (y) < term.scr ? term.hist[(term.histi + (y) - term.scr + 1 + HISTSIZE) % HISTSIZE] \
+ : term.line[(y) - term.scr] \
+)
+
+#define TLINEABS(y) ( \
+ (y) < 0 ? term.hist[(term.histi + (y) + 1 + HISTSIZE) % HISTSIZE] : term.line[(y)] \
+)
+
+#define UPDATEWRAPNEXT(alt, col) do { \
+ if ((term.c.state & CURSOR_WRAPNEXT) && term.c.x + term.wrapcwidth[alt] < col) { \
+ term.c.x += term.wrapcwidth[alt]; \
+ term.c.state &= ~CURSOR_WRAPNEXT; \
+ } \
+} while (0);
enum term_mode {
MODE_WRAP = 1 << 0,
@@ -53,6 +73,12 @@ enum term_mode {
MODE_UTF8 = 1 << 6,
};
+enum scroll_mode {
+ SCROLL_RESIZE = -1,
+ SCROLL_NOSAVEHIST = 0,
+ SCROLL_SAVEHIST = 1
+};
+
enum cursor_movement {
CURSOR_SAVE,
CURSOR_LOAD
@@ -114,7 +140,11 @@ typedef struct {
int row; /* nb row */
int col; /* nb col */
Line *line; /* screen */
- Line *alt; /* alternate screen */
+ Line hist[HISTSIZE]; /* history buffer */
+ int histi; /* history index */
+ int histf; /* nb history available */
+ int scr; /* scroll back */
+ int wrapcwidth[2]; /* used in updating WRAPNEXT when resizing */
int *dirty; /* dirtyness of lines */
TCursor c; /* cursor */
int ocx; /* old cursor col */
@@ -171,26 +201,37 @@ static void tprinter(char *, size_t);
static void tdumpsel(void);
static void tdumpline(int);
static void tdump(void);
-static void tclearregion(int, int, int, int);
+static void tclearregion(int, int, int, int, int);
static void tcursor(int);
+static void tclearglyph(Glyph *, int);
+static void tresetcursor(void);
static void tdeletechar(int);
static void tdeleteline(int);
static void tinsertblank(int);
static void tinsertblankline(int);
-static int tlinelen(int);
+static int tlinelen(Line len);
+static int tiswrapped(Line line);
+static char *tgetglyphs(char *, const Glyph *, const Glyph *);
+static size_t tgetline(char *, const Glyph *);
static void tmoveto(int, int);
static void tmoveato(int, int);
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, int);
static void tscrolldown(int, int);
+static void treflow(int, int);
+static void rscrolldown(int);
+static void tresizedef(int, int);
+static void tresizealt(int, int);
static void tsetattr(const int *, int);
static void tsetchar(Rune, const Glyph *, int, int);
static void tsetdirt(int, int);
static void tsetscroll(int, int);
static void tswapscreen(void);
+static void tloaddefscreen(int, int);
+static void tloadaltscreen(int, int);
static void tsetmode(int, int, const int *, int);
static int twrite(const char *, int, int);
static void tfulldirt(void);
@@ -204,7 +245,10 @@ static void tstrsequence(uchar);
static void drawregion(int, int, int, int);
static void selnormalize(void);
-static void selscroll(int, int);
+static void selscroll(int, int, int);
+static void selmove(int);
+static void selremove(void);
+static int regionselected(int, int, int, int);
static void selsnap(int *, int *, int);
static size_t utf8decode(const char *, Rune *, size_t);
@@ -412,17 +456,46 @@ selinit(void)
}
int
-tlinelen(int y)
+tlinelen(Line line)
{
- int i = term.col;
+ int i = term.col - 1;
+
+ for (; i >= 0 && !(line[i].mode & (ATTR_SET | ATTR_WRAP)); i--);
+ return i + 1;
+}
- if (term.line[y][i - 1].mode & ATTR_WRAP)
- return i;
+int
+tiswrapped(Line line)
+{
+ int len = tlinelen(line);
- while (i > 0 && term.line[y][i - 1].u == ' ')
- --i;
+ return len > 0 && (line[len - 1].mode & ATTR_WRAP);
+}
- return i;
+char *
+tgetglyphs(char *buf, const Glyph *gp, const Glyph *lgp)
+{
+ while (gp <= lgp)
+ if (gp->mode & ATTR_WDUMMY) {
+ gp++;
+ } else {
+ buf += utf8encode((gp++)->u, buf);
+ }
+ return buf;
+}
+
+size_t
+tgetline(char *buf, const Glyph *fgp)
+{
+ char *ptr;
+ const Glyph *lgp = &fgp[term.col - 1];
+
+ while (lgp > fgp && !(lgp->mode & (ATTR_SET | ATTR_WRAP)))
+ lgp--;
+ ptr = tgetglyphs(buf, fgp, lgp);
+ if (!(lgp->mode & ATTR_WRAP))
+ *(ptr++) = '\n';
+ return ptr - buf;
}
void
@@ -462,10 +535,11 @@ selextend(int col, int row, int type, int done)
sel.oe.x = col;
sel.oe.y = row;
- selnormalize();
sel.type = type;
+ selnormalize();
- if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.type || sel.mode == SEL_EMPTY)
+ if (oldey != sel.oe.y || oldex != sel.oe.x ||
+ oldtype != sel.type || sel.mode == SEL_EMPTY)
tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
sel.mode = done ? SEL_IDLE : SEL_READY;
@@ -489,46 +563,53 @@ selnormalize(void)
selsnap(&sel.nb.x, &sel.nb.y, -1);
selsnap(&sel.ne.x, &sel.ne.y, +1);
- /* expand selection over line breaks */
+ /* expand selection over line breaks */
if (sel.type == SEL_RECTANGULAR)
return;
- i = tlinelen(sel.nb.y);
- if (i < sel.nb.x)
+
+ i = tlinelen(TLINE(sel.nb.y));
+ if (sel.nb.x > i)
sel.nb.x = i;
- if (tlinelen(sel.ne.y) <= sel.ne.x)
- sel.ne.x = term.col - 1;
+ if (sel.ne.x >= tlinelen(TLINE(sel.ne.y)))
+ sel.ne.x = term.col - 1;
}
int
-selected(int x, int y)
+regionselected(int x1, int y1, int x2, int y2)
{
- if (sel.mode == SEL_EMPTY || sel.ob.x == -1 ||
- sel.alt != IS_SET(MODE_ALTSCREEN))
+ if (sel.ob.x == -1 || sel.mode == SEL_EMPTY ||
+ sel.alt != IS_SET(MODE_ALTSCREEN) || sel.nb.y > y2 || sel.ne.y < y1)
return 0;
- if (sel.type == SEL_RECTANGULAR)
- return BETWEEN(y, sel.nb.y, sel.ne.y)
- && BETWEEN(x, sel.nb.x, sel.ne.x);
+ return (sel.type == SEL_RECTANGULAR) ? sel.nb.x <= x2 && sel.ne.x >= x1
+ : (sel.nb.y != y2 || sel.nb.x <= x2) &&
+ (sel.ne.y != y1 || sel.ne.x >= x1);
+}
- return BETWEEN(y, sel.nb.y, sel.ne.y)
- && (y != sel.nb.y || x >= sel.nb.x)
- && (y != sel.ne.y || x <= sel.ne.x);
+int
+selected(int x, int y)
+{
+ return regionselected(x, y, x, y);
}
void
selsnap(int *x, int *y, int direction)
{
int newx, newy, xt, yt;
+ int rtop = 0, rbot = term.row - 1;
int delim, prevdelim;
const Glyph *gp, *prevgp;
+ if (!IS_SET(MODE_ALTSCREEN))
+ rtop += -term.histf + term.scr, rbot += term.scr;
+
switch (sel.snap) {
case SNAP_WORD:
/*
* 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;
@@ -536,24 +617,24 @@ selsnap(int *x, int *y, int direction)
if (!BETWEEN(newx, 0, term.col - 1)) {
newy += direction;
newx = (newx + term.col) % term.col;
- if (!BETWEEN(newy, 0, term.row - 1))
+ if (!BETWEEN(newy, rtop, rbot))
break;
if (direction > 0)
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))
+ if (newx >= tlinelen(TLINE(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)))
+ if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim ||
+ (delim && !(gp->u == ' ' && prevgp->u == ' '))))
break;
*x = newx;
@@ -570,18 +651,14 @@ 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
- & ATTR_WRAP)) {
+ for (; *y > rtop; *y -= 1) {
+ if (!tiswrapped(TLINE(*y-1)))
break;
- }
}
} else if (direction > 0) {
- for (; *y < term.row-1; *y += direction) {
- if (!(term.line[*y][term.col-1].mode
- & ATTR_WRAP)) {
+ for (; *y < rbot; *y += 1) {
+ if (!tiswrapped(TLINE(*y)))
break;
- }
}
}
break;
@@ -592,40 +669,34 @@ char *
getsel(void)
{
char *str, *ptr;
- int y, bufsize, lastx, linelen;
- const Glyph *gp, *last;
+ int y, lastx, linelen;
+ const Glyph *gp, *lgp;
- if (sel.ob.x == -1)
+ if (sel.ob.x == -1 || sel.alt != IS_SET(MODE_ALTSCREEN))
return NULL;
- bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
- ptr = str = xmalloc(bufsize);
+ str = xmalloc((term.col + 1) * (sel.ne.y - sel.nb.y + 1) * UTF_SIZ);
+ ptr = str;
/* append every set & selected glyph to the selection */
for (y = sel.nb.y; y <= sel.ne.y; y++) {
- if ((linelen = tlinelen(y)) == 0) {
+ Line line = TLINE(y);
+
+ if ((linelen = tlinelen(line)) == 0) {
*ptr++ = '\n';
continue;
}
if (sel.type == SEL_RECTANGULAR) {
- gp = &term.line[y][sel.nb.x];
+ gp = &line[sel.nb.x];
lastx = sel.ne.x;
} else {
- gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
+ gp = &line[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)];
- while (last >= gp && last->u == ' ')
- --last;
-
- for ( ; gp <= last; ++gp) {
- if (gp->mode & ATTR_WDUMMY)
- continue;
-
- ptr += utf8encode(gp->u, ptr);
- }
+ lgp = &line[MIN(lastx, linelen-1)];
+ ptr = tgetglyphs(ptr, gp, lgp);
/*
* Copy and pasting of line endings is inconsistent
* in the inconsistent terminal and GUI world.
@@ -636,10 +707,10 @@ getsel(void)
* FIXME: Fix the computer world.
*/
if ((y < sel.ne.y || lastx >= linelen) &&
- (!(last->mode & ATTR_WRAP) || sel.type == SEL_RECTANGULAR))
+ (!(lgp->mode & ATTR_WRAP) || sel.type == SEL_RECTANGULAR))
*ptr++ = '\n';
}
- *ptr = 0;
+ *ptr = '\0';
return str;
}
@@ -648,9 +719,15 @@ selclear(void)
{
if (sel.ob.x == -1)
return;
+ selremove();
+ tsetdirt(sel.nb.y, sel.ne.y);
+}
+
+void
+selremove(void)
+{
sel.mode = SEL_IDLE;
sel.ob.x = -1;
- tsetdirt(sel.nb.y, sel.ne.y);
}
void
@@ -852,6 +929,7 @@ ttywrite(const char *s, size_t n, int may_echo)
{
const char *next;
+ kscrolldown(&((Arg){ .i = term.scr }));
if (may_echo && IS_SET(MODE_ECHO))
twrite(s, n, 1);
@@ -987,7 +1065,7 @@ tsetdirtattr(int attr)
for (i = 0; i < term.row-1; i++) {
for (j = 0; j < term.col-1; j++) {
if (term.line[i][j].mode & attr) {
- tsetdirt(i, i);
+ term.dirty[i] = 1;
break;
}
}
@@ -997,7 +1075,8 @@ tsetdirtattr(int attr)
void
tfulldirt(void)
{
- tsetdirt(0, term.row-1);
+ for (int i = 0; i < term.row; i++)
+ term.dirty[i] = 1;
}
void
@@ -1014,110 +1093,259 @@ tcursor(int mode)
}
}
+void
+tresetcursor(void)
+{
+ term.c = (TCursor){ { .mode = ATTR_NULL, .fg = defaultfg, .bg = defaultbg },
+ .x = 0, .y = 0, .state = CURSOR_DEFAULT };
+}
+
void
treset(void)
{
uint i;
+ int x, y;
- term.c = (TCursor){{
- .mode = ATTR_NULL,
- .fg = defaultfg,
- .bg = defaultbg
- }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
+ tresetcursor();
memset(term.tabs, 0, term.col * sizeof(*term.tabs));
for (i = tabspaces; i < term.col; i += tabspaces)
term.tabs[i] = 1;
term.top = 0;
+ term.histf = 0;
+ term.scr = 0;
term.bot = term.row - 1;
term.mode = MODE_WRAP|MODE_UTF8;
memset(term.trantbl, CS_USA, sizeof(term.trantbl));
term.charset = 0;
+ selremove();
for (i = 0; i < 2; i++) {
- tmoveto(0, 0);
- tcursor(CURSOR_SAVE);
- tclearregion(0, 0, term.col-1, term.row-1);
+ tcursor(CURSOR_SAVE); /* reset saved cursor */
+ for (y = 0; y < term.row; y++)
+ for (x = 0; x < term.col; x++)
+ tclearglyph(&term.line[y][x], 0);
tswapscreen();
}
+ tfulldirt();
}
void
tnew(int col, int row)
{
- term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
- tresize(col, row);
- treset();
+ int i, j;
+
+ for (i = 0; i < 2; i++) {
+ term.line = xmalloc(row * sizeof(Line));
+ for (j = 0; j < row; j++)
+ term.line[j] = xmalloc(col * sizeof(Glyph));
+ term.col = col, term.row = row;
+ tswapscreen();
+ }
+ term.dirty = xmalloc(row * sizeof(*term.dirty));
+ term.tabs = xmalloc(col * sizeof(*term.tabs));
+ for (i = 0; i < HISTSIZE; i++)
+ term.hist[i] = xmalloc(col * sizeof(Glyph));
+ treset();
}
+/* handle it with care */
void
tswapscreen(void)
{
- Line *tmp = term.line;
+ static Line *altline;
+ static int altcol, altrow;
+ Line *tmpline = term.line;
+ int tmpcol = term.col, tmprow = term.row;
- term.line = term.alt;
- term.alt = tmp;
+ term.line = altline;
+ term.col = altcol, term.row = altrow;
+ altline = tmpline;
+ altcol = tmpcol, altrow = tmprow;
term.mode ^= MODE_ALTSCREEN;
+}
+
+void
+tloaddefscreen(int clear, int loadcursor)
+{
+ int col, row, alt = IS_SET(MODE_ALTSCREEN);
+
+ if (alt) {
+ if (clear)
+ tclearregion(0, 0, term.col-1, term.row-1, 1);
+ col = term.col, row = term.row;
+ tswapscreen();
+ }
+ if (loadcursor)
+ tcursor(CURSOR_LOAD);
+ if (alt)
+ tresizedef(col, row);
+}
+
+void
+tloadaltscreen(int clear, int savecursor)
+{
+ int col, row, def = !IS_SET(MODE_ALTSCREEN);
+
+ if (savecursor)
+ tcursor(CURSOR_SAVE);
+ if (def) {
+ col = term.col, row = term.row;
+ tswapscreen();
+ term.scr = 0;
+ tresizealt(col, row);
+ }
+ if (clear)
+ tclearregion(0, 0, term.col-1, term.row-1, 1);
+}
+
+int
+tisaltscreen(void)
+{
+ return IS_SET(MODE_ALTSCREEN);
+}
+
+void
+kscrolldown(const Arg* a)
+{
+ int n = a->i;
+
+ if (!term.scr || IS_SET(MODE_ALTSCREEN))
+ return;
+
+ if (n < 0)
+ n = MAX(term.row / -n, 1);
+
+ if (n <= term.scr) {
+ term.scr -= n;
+ } else {
+ n = term.scr;
+ term.scr = 0;
+ }
+
+ if (sel.ob.x != -1 && !sel.alt)
+ selmove(-n); /* negate change in term.scr */
tfulldirt();
}
void
-tscrolldown(int orig, int n)
+kscrollup(const Arg* a)
{
- int i;
+ int n = a->i;
+
+ if (!term.histf || IS_SET(MODE_ALTSCREEN))
+ return;
+
+ if (n < 0)
+ n = MAX(term.row / -n, 1);
+
+ if (term.scr + n <= term.histf) {
+ term.scr += n;
+ } else {
+ n = term.histf - term.scr;
+ term.scr = term.histf;
+ }
+
+ if (sel.ob.x != -1 && !sel.alt)
+ selmove(n); /* negate change in term.scr */
+ tfulldirt();
+}
+
+void
+tscrolldown(int top, int n)
+{
+ int i, bot = term.bot;
Line temp;
- LIMIT(n, 0, term.bot-orig+1);
+ if (n <= 0)
+ return;
+ n = MIN(n, bot-top+1);
- tsetdirt(orig, term.bot-n);
- tclearregion(0, term.bot-n+1, term.col-1, term.bot);
+ tsetdirt(top, bot-n);
+ tclearregion(0, bot-n+1, term.col-1, bot, 1);
- for (i = term.bot; i >= orig+n; i--) {
+ for (i = bot; i >= top+n; i--) {
temp = term.line[i];
term.line[i] = term.line[i-n];
term.line[i-n] = temp;
}
- selscroll(orig, n);
+ if (sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN))
+ selscroll(top, bot, n);
}
void
-tscrollup(int orig, int n)
+tscrollup(int top, int bot, int n, int mode)
{
- int i;
+ int i, j, s;
+ int alt = IS_SET(MODE_ALTSCREEN);
+ int savehist = !alt && top == 0 && mode != SCROLL_NOSAVEHIST;
Line temp;
- LIMIT(n, 0, term.bot-orig+1);
+ if (n <= 0)
+ return;
+ n = MIN(n, bot-top+1);
+
+ if (savehist) {
+ for (i = 0; i < n; i++) {
+ term.histi = (term.histi + 1) % HISTSIZE;
+ temp = term.hist[term.histi];
+ for (j = 0; j < term.col; j++)
+ tclearglyph(&temp[j], 1);
+ term.hist[term.histi] = term.line[i];
+ term.line[i] = temp;
+ }
+ term.histf = MIN(term.histf + n, HISTSIZE);
+ s = n;
+ if (term.scr) {
+ j = term.scr;
+ term.scr = MIN(j + n, HISTSIZE);
+ s = j + n - term.scr;
+ }
+ if (mode != SCROLL_RESIZE)
+ tfulldirt();
+ } else {
+ tclearregion(0, top, term.col-1, top+n-1, 1);
+ tsetdirt(top+n, bot);
+ }
- tclearregion(0, orig, term.col-1, orig+n-1);
- tsetdirt(orig+n, term.bot);
- for (i = orig; i <= term.bot-n; i++) {
+ for (i = top; i <= bot-n; i++) {
temp = term.line[i];
term.line[i] = term.line[i+n];
term.line[i+n] = temp;
}
- selscroll(orig, -n);
+ if (sel.ob.x != -1 && sel.alt == alt) {
+ if (!savehist) {
+ selscroll(top, bot, -n);
+ } else if (s > 0) {
+ selmove(-s);
+ if (-term.scr + sel.nb.y < -term.histf)
+ selremove();
+ }
+ }
}
void
-selscroll(int orig, int n)
+selmove(int n)
{
- if (sel.ob.x == -1)
- return;
+ sel.ob.y += n, sel.nb.y += n;
+ sel.oe.y += n, sel.ne.y += n;
+}
+
+void
+selscroll(int top, int bot, int n)
+{
+ /* turn absolute coordinates into relative */
+ top += term.scr, bot += term.scr;
- if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) {
+ if (BETWEEN(sel.nb.y, top, bot) != BETWEEN(sel.ne.y, top, bot)) {
selclear();
- } else if (BETWEEN(sel.nb.y, orig, term.bot)) {
- sel.ob.y += n;
- sel.oe.y += n;
- if (sel.ob.y < term.top || sel.ob.y > term.bot ||
- sel.oe.y < term.top || sel.oe.y > term.bot) {
+ } else if (BETWEEN(sel.nb.y, top, bot)) {
+ selmove(n);
+ if (sel.nb.y < top || sel.ne.y > bot)
selclear();
- } else {
- selnormalize();
- }
}
}
@@ -1127,7 +1355,7 @@ tnewline(int first_col)
int y = term.c.y;
if (y == term.bot) {
- tscrollup(term.top, 1);
+ tscrollup(term.top, term.bot, 1, SCROLL_SAVEHIST);
} else {
y++;
}
@@ -1217,75 +1445,79 @@ tsetchar(Rune u, const Glyph *attr, int x, int y)
} else if (term.line[y][x].mode & ATTR_WDUMMY) {
term.line[y][x-1].u = ' ';
term.line[y][x-1].mode &= ~ATTR_WIDE;
- }
+ }
term.dirty[y] = 1;
term.line[y][x] = *attr;
term.line[y][x].u = u;
+ term.line[y][x].mode |= ATTR_SET;
}
void
-tclearregion(int x1, int y1, int x2, int y2)
+tclearglyph(Glyph *gp, int usecurattr)
{
- int x, y, temp;
- Glyph *gp;
+ if (usecurattr) {
+ gp->fg = term.c.attr.fg;
+ gp->bg = term.c.attr.bg;
+ } else {
+ gp->fg = defaultfg;
+ gp->bg = defaultbg;
+ }
+ gp->mode = ATTR_NULL;
+ gp->u = ' ';
+}
- if (x1 > x2)
- temp = x1, x1 = x2, x2 = temp;
- if (y1 > y2)
- temp = y1, y1 = y2, y2 = temp;
+void
+tclearregion(int x1, int y1, int x2, int y2, int usecurattr)
+{
+ int x, y;
- LIMIT(x1, 0, term.col-1);
- LIMIT(x2, 0, term.col-1);
- LIMIT(y1, 0, term.row-1);
- LIMIT(y2, 0, term.row-1);
+ /* regionselected() takes relative coordinates */
+ if (regionselected(x1+term.scr, y1+term.scr, x2+term.scr, y2+term.scr))
+ selremove();
for (y = y1; y <= y2; y++) {
term.dirty[y] = 1;
- for (x = x1; x <= x2; x++) {
- gp = &term.line[y][x];
- if (selected(x, y))
- selclear();
- gp->fg = term.c.attr.fg;
- gp->bg = term.c.attr.bg;
- gp->mode = 0;
- gp->u = ' ';
- }
+ for (x = x1; x <= x2; x++)
+ tclearglyph(&term.line[y][x], usecurattr);
}
}
void
tdeletechar(int n)
{
- int dst, src, size;
- Glyph *line;
-
- LIMIT(n, 0, term.col - term.c.x);
+ int src, dst, size;
+ Line line;
+ if (n <= 0)
+ return;
dst = term.c.x;
- src = term.c.x + n;
+ src = MIN(term.c.x + n, term.col);
size = term.col - src;
- line = term.line[term.c.y];
-
- memmove(&line[dst], &line[src], size * sizeof(Glyph));
- tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
+ if (size > 0) { /* otherwise src would point beyond the array
+ https://stackoverflow.com/questions/29844298 */
+ line = term.line[term.c.y];
+ memmove(&line[dst], &line[src], size * sizeof(Glyph));
+ }
+ tclearregion(dst + size, term.c.y, term.col - 1, term.c.y, 1);
}
void
tinsertblank(int n)
{
- int dst, src, size;
- Glyph *line;
-
- LIMIT(n, 0, term.col - term.c.x);
+ int src, dst, size;
+ Line line;
- dst = term.c.x + n;
+ if (n <= 0)
+ return;
+ dst = MIN(term.c.x + n, term.col);
src = term.c.x;
size = term.col - dst;
- line = term.line[term.c.y];
-
- memmove(&line[dst], &line[src], size * sizeof(Glyph));
- tclearregion(src, term.c.y, dst - 1, term.c.y);
+ if (size > 0) { /* otherwise dst would point beyond the array */
+ line = term.line[term.c.y];
+ memmove(&line[dst], &line[src], size * sizeof(Glyph));
+ }
+ tclearregion(src, term.c.y, dst - 1, term.c.y, 1);
}
void
@@ -1299,7 +1531,7 @@ void
tdeleteline(int n)
{
if (BETWEEN(term.c.y, term.top, term.bot))
- tscrollup(term.c.y, n);
+ tscrollup(term.c.y, term.bot, n, SCROLL_NOSAVEHIST);
}
int32_t
@@ -1473,7 +1705,7 @@ tsetscroll(int t, int b)
void
tsetmode(int priv, int set, const int *args, int narg)
{
- int alt; const int *lim;
+ const int *lim;
for (lim = args + narg; args < lim; ++args) {
if (priv) {
@@ -1534,25 +1766,18 @@ tsetmode(int priv, int set, const int *args, int narg)
xsetmode(set, MODE_8BIT);
break;
case 1049: /* swap screen & set/restore cursor as xterm */
- if (!allowaltscreen)
- break;
- tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
- /* FALLTHROUGH */
case 47: /* swap screen */
- case 1047:
+ case 1047: /* swap screen, clearing alternate screen */
if (!allowaltscreen)
break;
- alt = IS_SET(MODE_ALTSCREEN);
- if (alt) {
- tclearregion(0, 0, term.col-1,
- term.row-1);
- }
- if (set ^ alt) /* set is always 1 or 0 */
- tswapscreen();
- if (*args != 1049)
- break;
- /* FALLTHROUGH */
+ if (set)
+ tloadaltscreen(*args == 1049, *args == 1049);
+ else
+ tloaddefscreen(*args == 1047, *args == 1049);
+ break;
case 1048:
+ if (!allowaltscreen)
+ break;
tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
break;
case 2004: /* 2004: bracketed paste mode */
@@ -1604,7 +1829,7 @@ void
csihandle(void)
{
char buf[40];
- int len;
+ int n, x;
switch (csiescseq.mode[0]) {
default:
@@ -1702,20 +1927,30 @@ csihandle(void)
case 'J': /* ED -- Clear screen */
switch (csiescseq.arg[0]) {
case 0: /* below */
- tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
+ tclearregion(term.c.x, term.c.y, term.col-1, term.c.y, 1);
if (term.c.y < term.row-1) {
- tclearregion(0, term.c.y+1, term.col-1,
- term.row-1);
+ tclearregion(0, term.c.y+1, term.col-1, term.row-1, 1);
}
break;
case 1: /* above */
- if (term.c.y > 1)
- tclearregion(0, 0, term.col-1, term.c.y-1);
- tclearregion(0, term.c.y, term.c.x, term.c.y);
+ if (term.c.y >= 1)
+ tclearregion(0, 0, term.col-1, term.c.y-1, 1);
+ tclearregion(0, term.c.y, term.c.x, term.c.y, 1);
break;
case 2: /* all */
- tclearregion(0, 0, term.col-1, term.row-1);
- break;
+ if (IS_SET(MODE_ALTSCREEN)) {
+ tclearregion(0, 0, term.col-1, term.row-1, 1);
+ break;
+ }
+ /* vte does this:
+ tscrollup(0, term.row-1, term.row, SCROLL_SAVEHIST); */
+
+ /* alacritty does this: */
+ for (n = term.row-1; n >= 0 && tlinelen(term.line[n]) == 0; n--);
+ if (n >= 0)
+ tscrollup(0, term.row-1, n+1, SCROLL_SAVEHIST);
+ tscrollup(0, term.row-1, term.row-n-1, SCROLL_NOSAVEHIST);
+ break;
default:
goto unknown;
}
@@ -1723,20 +1958,20 @@ csihandle(void)
case 'K': /* EL -- Clear line */
switch (csiescseq.arg[0]) {
case 0: /* right */
- tclearregion(term.c.x, term.c.y, term.col-1,
- term.c.y);
+ tclearregion(term.c.x, term.c.y, term.col-1, term.c.y, 1);
break;
case 1: /* left */
- tclearregion(0, term.c.y, term.c.x, term.c.y);
+ tclearregion(0, term.c.y, term.c.x, term.c.y, 1);
break;
case 2: /* all */
- tclearregion(0, term.c.y, term.col-1, term.c.y);
+ tclearregion(0, term.c.y, term.col-1, term.c.y, 1);
break;
}
break;
case 'S': /* SU -- Scroll <n> line up */
DEFAULT(csiescseq.arg[0], 1);
- tscrollup(term.top, csiescseq.arg[0]);
+ /* xterm, urxvt, alacritty save this in history */
+ tscrollup(term.top, term.bot, csiescseq.arg[0], SCROLL_SAVEHIST);
break;
case 'T': /* SD -- Scroll <n> line down */
DEFAULT(csiescseq.arg[0], 1);
@@ -1754,9 +1989,11 @@ csihandle(void)
tdeleteline(csiescseq.arg[0]);
break;
case 'X': /* ECH -- Erase <n> char */
+ if (csiescseq.arg[0] < 0)
+ return;
DEFAULT(csiescseq.arg[0], 1);
- tclearregion(term.c.x, term.c.y,
- term.c.x + csiescseq.arg[0] - 1, term.c.y);
+ x = MIN(term.c.x + csiescseq.arg[0], term.col) - 1;
+ tclearregion(term.c.x, term.c.y, x, term.c.y, 1);
break;
case 'P': /* DCH -- Delete <n> char */
DEFAULT(csiescseq.arg[0], 1);
@@ -1778,9 +2015,9 @@ csihandle(void)
break;
case 'n': /* DSR – Device Status Report (cursor position) */
if (csiescseq.arg[0] == 6) {
- len = snprintf(buf, sizeof(buf), "\033[%i;%iR",
+ n = snprintf(buf, sizeof(buf), "\033[%i;%iR",
term.c.y+1, term.c.x+1);
- ttywrite(buf, len, 0);
+ ttywrite(buf, n, 0);