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/* $Id: screen.c 2553 2011-07-09 09:42:33Z tcunha $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
void screen_resize_x(struct screen *, u_int);
void screen_resize_y(struct screen *, u_int);
/* Create a new screen. */
void
screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
{
char hn[MAXHOSTNAMELEN];
s->grid = grid_create(sx, sy, hlimit);
if (gethostname(hn, MAXHOSTNAMELEN) == 0)
s->title = xstrdup(hn);
else
s->title = xstrdup("");
s->cstyle = 0;
s->ccolour = xstrdup("");
s->tabs = NULL;
screen_reinit(s);
}
/* Reinitialise screen. */
void
screen_reinit(struct screen *s)
{
s->cx = 0;
s->cy = 0;
s->rupper = 0;
s->rlower = screen_size_y(s) - 1;
s->mode = MODE_CURSOR | MODE_WRAP;
screen_reset_tabs(s);
grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy);
screen_clear_selection(s);
}
/* Destroy a screen. */
void
screen_free(struct screen *s)
{
if (s->tabs != NULL)
xfree(s->tabs);
xfree(s->title);
xfree(s->ccolour);
grid_destroy(s->grid);
}
/* Reset tabs to default, eight spaces apart. */
void
screen_reset_tabs(struct screen *s)
{
u_int i;
if (s->tabs != NULL)
xfree(s->tabs);
if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
fatal("bit_alloc failed");
for (i = 8; i < screen_size_x(s); i += 8)
bit_set(s->tabs, i);
}
/* Set screen cursor style. */
void
screen_set_cursor_style(struct screen *s, u_int style)
{
if (style <= 4)
s->cstyle = style;
}
/* Set screen cursor colour. */
void
screen_set_cursor_colour(struct screen *s, const char *colour_string)
{
xfree(s->ccolour);
s->ccolour = xstrdup(colour_string);
}
/* Set screen title. */
void
screen_set_title(struct screen *s, const char *title)
{
char tmp[BUFSIZ];
strlcpy(tmp, title, sizeof tmp);
xfree(s->title);
s->title = xstrdup(tmp);
}
/* Resize screen. */
void
screen_resize(struct screen *s, u_int sx, u_int sy)
{
if (sx < 1)
sx = 1;
if (sy < 1)
sy = 1;
if (sx != screen_size_x(s)) {
screen_resize_x(s, sx);
/*
* It is unclear what should happen to tabs on resize. xterm
* seems to try and maintain them, rxvt resets them. Resetting
* is simpler and more reliable so let's do that.
*/
screen_reset_tabs(s);
}
if (sy != screen_size_y(s))
screen_resize_y(s, sy);
}
void
screen_resize_x(struct screen *s, u_int sx)
{
struct grid *gd = s->grid;
if (sx == 0)
fatalx("zero size");
/*
* Treat resizing horizontally simply: just ensure the cursor is
* on-screen and change the size. Don't bother to truncate any lines -
* then the data should be accessible if the size is then incrased.
*
* The only potential wrinkle is if UTF-8 double-width characters are
* left in the last column, but UTF-8 terminals should deal with this
* sanely.
*/
if (s->cx >= sx)
s->cx = sx - 1;
gd->sx = sx;
}
void
screen_resize_y(struct screen *s, u_int sy)
{
struct grid *gd = s->grid;
u_int needed, available, oldy, i;
if (sy == 0)
fatalx("zero size");
oldy = screen_size_y(s);
/*
* When resizing:
*
* If the height is decreasing, delete lines from the bottom until
* hitting the cursor, then push lines from the top into the history.
*
* When increasing, pull as many lines as possible from the history to
* the top, then fill the remaining with blanks at the bottom.
*/
/* Size decreasing. */
if (sy < oldy) {
needed = oldy - sy;
/* Delete as many lines as possible from the bottom. */
available = oldy - 1 - s->cy;
if (available > 0) {
if (available > needed)
available = needed;
grid_view_delete_lines(gd, oldy - available, available);
}
needed -= available;
/*
* Now just increase the history size, if possible, to take
* over the lines which are left. If history is off, delete
* lines from the top.
*
* XXX Should apply history limit?
*/
available = s->cy;
if (gd->flags & GRID_HISTORY)
gd->hsize += needed;
else if (needed > 0 && available > 0) {
if (available > needed)
available = needed;
grid_view_delete_lines(gd, 0, available);
}
s->cy -= needed;
}
/* Resize line arrays. */
gd->linedata = xrealloc(
gd->linedata, gd->hsize + sy, sizeof *gd->linedata);
/* Size increasing. */
if (sy > oldy) {
needed = sy - oldy;
/*
* Try to pull as much as possible out of the history, if is
* is enabled.
*/
available = gd->hsize;
if (gd->flags & GRID_HISTORY && available > 0) {
if (available > needed)
available = needed;
gd->hsize -= available;
s->cy += available;
} else
available = 0;
needed -= available;
/* Then fill the rest in with blanks. */
for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
}
/* Set the new size, and reset the scroll region. */
gd->sy = sy;
s->rupper = 0;
s->rlower = screen_size_y(s) - 1;
}
/* Set selection. */
void
screen_set_selection(struct screen *s, u_int sx, u_int sy,
u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
{
struct screen_sel *sel = &s->sel;
memcpy(&sel->cell, gc, sizeof sel->cell);
sel->flag = 1;
sel->rectflag = rectflag;
sel->sx = sx; sel->sy = sy;
sel->ex = ex; sel->ey = ey;
}
/* Clear selection. */
void
screen_clear_selection(struct screen *s)
{
struct screen_sel *sel = &s->sel;
sel->flag = 0;
}
/* Check if cell in selection. */
int
screen_check_selection(struct screen *s, u_int px, u_int py)
{
struct screen_sel *sel = &s->sel;
if (!sel->flag)
return (0);
if (sel->rectflag) {
if (sel->sy < sel->ey) {
/* start line < end line -- downward selection. */
if (py < sel->sy || py > sel->ey)
return (0);
} else if (sel->sy > sel->ey) {
/* start line > end line -- upward selection. */
if (py > sel->sy || py < sel->ey)
return (0);
} else {
/* starting line == ending line. */
if (py != sel->sy)
return (0);
}
/*
* Need to include the selection start row, but not the cursor
* row, which means the selection changes depending on which
* one is on the left.
*/
if (sel->ex < sel->sx) {
/* Cursor (ex) is on the left. */
if (px < sel->ex)
return (0);
if (px > sel->sx)
return (0);
} else {
/* Selection start (sx) is on the left. */
if (px < sel->sx)
return (0);
if (px > sel->ex)
return (0);
}
} else {
/*
* Like emacs, keep the top-left-most character, and drop the
* bottom-right-most, regardless of copy direction.
*/
if (sel->sy < sel->ey) {
/* starting line < ending line -- downward selection. */
if (py < sel->sy || py > sel->ey)
return (0);
if ((py == sel->sy && px < sel->sx)
|| (py == sel->ey && px > sel->ex))
return (0);
} else if (sel->sy > sel->ey) {
/* starting line > ending line -- upward selection. */
if (py > sel->sy || py < sel->ey)
return (0);
if ((py == sel->sy && px >= sel->sx)
|| (py == sel->ey && px < sel->ex))
return (0);
} else {
/* starting line == ending line. */
if (py != sel->sy)
return (0);
if (sel->ex < sel->sx) {
/* cursor (ex) is on the left */
if (px > sel->sx || px < sel->ex)
return (0);
} else {
/* selection start (sx) is on the left */
if (px < sel->sx || px > sel->ex)
return (0);
}
}
}
return (1);
}
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