void
term_redisplay (void)
{
/* Calculate the start column if the line at point has to be truncated. */
Buffer bp = get_window_bp (cur_wp);
size_t lastcol = 0, t = tab_width (bp);
size_t o = window_o (cur_wp);
size_t lineo = o - get_buffer_line_o (bp);
col = 0;
o -= lineo;
set_window_start_column (cur_wp, 0);
size_t ew = get_window_ewidth (cur_wp);
for (size_t lp = lineo; lp != SIZE_MAX; --lp)
{
col = 0;
for (size_t p = lp; p < lineo; ++p)
{
char c = get_buffer_char (bp, o + p);
if (isprint (c))
col++;
else
col += strlen (make_char_printable (get_buffer_char (bp, o + p), col, t));
}
if (col >= ew - 1 || (lp / (ew / 3)) + 2 < lineo / (ew / 3))
{
set_window_start_column (cur_wp, lp + 1);
col = lastcol;
break;
}
lastcol = col;
}
/* Draw the windows. */
cur_topline = 0;
size_t topline = 0;
for (Window wp = head_wp; wp != NULL; wp = get_window_next (wp))
{
if (wp == cur_wp)
cur_topline = topline;
draw_window (topline, wp);
topline += get_window_fheight (wp);
}
term_redraw_cursor ();
}
static void
draw_window (size_t topline, Window wp)
{
size_t i, o;
Region r;
int highlight = calculate_highlight_region (wp, &r);
/* Find the first line to display on the first screen line. */
for (o = buffer_start_of_line (get_window_bp (wp), window_o (wp)), i = get_window_topdelta (wp);
i > 0 && o > 0;
assert ((o = buffer_prev_line (get_window_bp (wp), o)) != SIZE_MAX), --i)
;
/* Draw the window lines. */
size_t cur_tab_width = tab_width (get_window_bp (wp));
for (i = topline; i < get_window_eheight (wp) + topline; ++i)
{
/* Clear the line. */
term_move (i, 0);
term_clrtoeol ();
/* If at the end of the buffer, don't write any text. */
if (o == SIZE_MAX)
continue;
draw_line (i, get_window_start_column (wp), wp, o, r, highlight, cur_tab_width);
if (get_window_start_column (wp) > 0)
{
term_move (i, 0);
term_addstr("$");
}
o = buffer_next_line (get_window_bp (wp), o);
}
set_window_all_displayed (wp, o >= get_buffer_size (get_window_bp (wp)));
/* Draw the status line only if there is available space after the
buffer text space. */
if (get_window_fheight (wp) - get_window_eheight (wp) > 0)
draw_status_line (topline + get_window_eheight (wp), wp);
}
static void draw_window(size_t topline, Window *wp)
{
size_t i, startcol, lineno;
Line *lp;
Region r;
int highlight;
Point pt = window_pt(wp);
calculate_highlight_region(wp, &r, &highlight);
/* Find the first line to display on the first screen line. */
for (lp = pt.p, lineno = pt.n, i = wp->topdelta;
i > 0 && list_prev(lp) != wp->bp->lines; lp = list_prev(lp), --i, --lineno)
;
cur_tab_width = tab_width(wp->bp);
/* Draw the window lines. */
for (i = topline; i < wp->eheight + topline; ++i, ++lineno) {
/* Clear the line. */
term_move(i, 0);
term_clrtoeol();
/* If at the end of the buffer, don't write any text. */
if (lp == wp->bp->lines)
continue;
startcol = wp->start_column;
draw_line(i, startcol, wp, lp, lineno, &r, highlight);
if (wp->start_column > 0) {
term_move(i, 0);
term_addch('$');
}
lp = list_next(lp);
}
}
/*
* This function calculates the best start column to draw if the line
* needs to get truncated.
* Called only for the line where is the point.
*/
static void calculate_start_column(Window *wp)
{
size_t col = 0, lastcol = 0, t = tab_width(wp->bp);
int rpfact, lpfact;
char *buf, *rp, *lp, *p;
Point pt = window_pt(wp);
rp = astr_char(pt.p->item, (ptrdiff_t)pt.o);
rpfact = pt.o / (wp->ewidth / 3);
for (lp = rp; lp >= astr_cstr(pt.p->item); --lp) {
for (col = 0, p = lp; p < rp; ++p)
if (*p == '\t') {
col |= t - 1;
++col;
} else if (isprint(*p))
++col;
else {
col += make_char_printable(&buf, (size_t)*p);
free(buf);
}
lpfact = (lp - astr_cstr(pt.p->item)) / (wp->ewidth / 3);
if (col >= wp->ewidth - 1 || lpfact < (rpfact - 2)) {
wp->start_column = lp + 1 - astr_cstr(pt.p->item);
point_screen_column = lastcol;
return;
}
lastcol = col;
}
wp->start_column = 0;
point_screen_column = col;
}
static void
insert_expanded_tab (void)
{
size_t t = tab_width (cur_bp);
bprintf ("%*s", (int) (t - get_goalc () % t), "");
}
