tmux/screen.c

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/* $OpenBSD$ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* 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 <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>
#include "tmux.h"
/* Selected area in screen. */
struct screen_sel {
int hidden;
int rectangle;
int modekeys;
u_int sx;
u_int sy;
u_int ex;
u_int ey;
struct grid_cell cell;
};
/* Entry on title stack. */
struct screen_title_entry {
char *text;
TAILQ_ENTRY(screen_title_entry) entry;
};
TAILQ_HEAD(screen_titles, screen_title_entry);
static void screen_resize_y(struct screen *, u_int, int, u_int *);
static void screen_reflow(struct screen *, u_int, u_int *, u_int *, int);
/* Free titles stack. */
static void
screen_free_titles(struct screen *s)
{
struct screen_title_entry *title_entry;
if (s->titles == NULL)
return;
while ((title_entry = TAILQ_FIRST(s->titles)) != NULL) {
TAILQ_REMOVE(s->titles, title_entry, entry);
free(title_entry->text);
free(title_entry);
}
free(s->titles);
s->titles = NULL;
}
/* Create a new screen. */
void
screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
{
s->grid = grid_create(sx, sy, hlimit);
s->saved_grid = NULL;
s->title = xstrdup("");
s->titles = NULL;
s->path = NULL;
s->cstyle = 0;
s->ccolour = xstrdup("");
s->tabs = NULL;
s->sel = NULL;
s->write_list = 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;
if (s->saved_grid != NULL)
screen_alternate_off(s, NULL, 0);
s->saved_cx = UINT_MAX;
s->saved_cy = UINT_MAX;
screen_reset_tabs(s);
grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy, 8);
screen_clear_selection(s);
screen_free_titles(s);
}
/* Destroy a screen. */
void
screen_free(struct screen *s)
{
free(s->sel);
free(s->tabs);
free(s->path);
free(s->title);
free(s->ccolour);
if (s->write_list != NULL)
screen_write_free_list(s);
if (s->saved_grid != NULL)
grid_destroy(s->saved_grid);
grid_destroy(s->grid);
screen_free_titles(s);
}
/* Reset tabs to default, eight spaces apart. */
void
screen_reset_tabs(struct screen *s)
{
u_int i;
free(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 <= 6)
s->cstyle = style;
}
/* Set screen cursor colour. */
void
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screen_set_cursor_colour(struct screen *s, const char *colour)
{
free(s->ccolour);
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s->ccolour = xstrdup(colour);
}
/* Set screen title. */
int
screen_set_title(struct screen *s, const char *title)
{
if (!utf8_isvalid(title))
return (0);
free(s->title);
s->title = xstrdup(title);
return (1);
}
/* Set screen path. */
void
screen_set_path(struct screen *s, const char *path)
{
free(s->path);
utf8_stravis(&s->path, path, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
}
/* Push the current title onto the stack. */
void
screen_push_title(struct screen *s)
{
struct screen_title_entry *title_entry;
if (s->titles == NULL) {
s->titles = xmalloc(sizeof *s->titles);
TAILQ_INIT(s->titles);
}
title_entry = xmalloc(sizeof *title_entry);
title_entry->text = xstrdup(s->title);
TAILQ_INSERT_HEAD(s->titles, title_entry, entry);
}
/*
* Pop a title from the stack and set it as the screen title. If the stack is
* empty, do nothing.
*/
void
screen_pop_title(struct screen *s)
{
struct screen_title_entry *title_entry;
if (s->titles == NULL)
return;
title_entry = TAILQ_FIRST(s->titles);
if (title_entry != NULL) {
screen_set_title(s, title_entry->text);
TAILQ_REMOVE(s->titles, title_entry, entry);
free(title_entry->text);
free(title_entry);
}
}
/* Resize screen with options. */
void
screen_resize_cursor(struct screen *s, u_int sx, u_int sy, int reflow,
int eat_empty, int cursor)
{
u_int cx = s->cx, cy = s->grid->hsize + s->cy;
if (s->write_list != NULL)
screen_write_free_list(s);
log_debug("%s: new size %ux%u, now %ux%u (cursor %u,%u = %u,%u)",
__func__, sx, sy, screen_size_x(s), screen_size_y(s), s->cx, s->cy,
cx, cy);
if (sx < 1)
sx = 1;
if (sy < 1)
sy = 1;
if (sx != screen_size_x(s)) {
s->grid->sx = sx;
screen_reset_tabs(s);
} else
reflow = 0;
if (sy != screen_size_y(s))
screen_resize_y(s, sy, eat_empty, &cy);
if (reflow)
screen_reflow(s, sx, &cx, &cy, cursor);
if (cy >= s->grid->hsize) {
s->cx = cx;
s->cy = cy - s->grid->hsize;
} else {
s->cx = 0;
s->cy = 0;
}
log_debug("%s: cursor finished at %u,%u = %u,%u", __func__, s->cx,
s->cy, cx, cy);
if (s->write_list != NULL)
screen_write_make_list(s);
}
/* Resize screen. */
void
screen_resize(struct screen *s, u_int sx, u_int sy, int reflow)
{
screen_resize_cursor(s, sx, sy, reflow, 1, 1);
}
static void
screen_resize_y(struct screen *s, u_int sy, int eat_empty, u_int *cy)
{
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 scrolled
* history (not explicitly cleared from view) 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. */
if (eat_empty) {
available = oldy - 1 - s->cy;
if (available > 0) {
if (available > needed)
available = needed;
grid_view_delete_lines(gd, oldy - available,
available, 8);
}
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.
*/
available = s->cy;
if (gd->flags & GRID_HISTORY) {
gd->hscrolled += needed;
gd->hsize += needed;
} else if (needed > 0 && available > 0) {
if (available > needed)
available = needed;
grid_view_delete_lines(gd, 0, available, 8);
(*cy) -= available;
}
}
/* Resize line array. */
grid_adjust_lines(gd, gd->hsize + sy);
/* Size increasing. */
if (sy > oldy) {
needed = sy - oldy;
/*
* Try to pull as much as possible out of scrolled history, if
* is is enabled.
*/
available = gd->hscrolled;
if (gd->flags & GRID_HISTORY && available > 0) {
if (available > needed)
available = needed;
gd->hscrolled -= available;
gd->hsize -= available;
} else
available = 0;
needed -= available;
/* Then fill the rest in with blanks. */
for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
grid_empty_line(gd, i, 8);
}
/* 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 rectangle, int modekeys, struct grid_cell *gc)
{
if (s->sel == NULL)
s->sel = xcalloc(1, sizeof *s->sel);
memcpy(&s->sel->cell, gc, sizeof s->sel->cell);
s->sel->hidden = 0;
s->sel->rectangle = rectangle;
s->sel->modekeys = modekeys;
s->sel->sx = sx;
s->sel->sy = sy;
s->sel->ex = ex;
s->sel->ey = ey;
}
/* Clear selection. */
void
screen_clear_selection(struct screen *s)
{
free(s->sel);
s->sel = NULL;
}
/* Hide selection. */
void
screen_hide_selection(struct screen *s)
{
if (s->sel != NULL)
s->sel->hidden = 1;
}
/* Check if cell in selection. */
int
screen_check_selection(struct screen *s, u_int px, u_int py)
{
struct screen_sel *sel = s->sel;
u_int xx;
if (sel == NULL || sel->hidden)
return (0);
if (sel->rectangle) {
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)
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return (0);
if (sel->modekeys == MODEKEY_EMACS)
xx = (sel->ex == 0 ? 0 : sel->ex - 1);
else
xx = sel->ex;
if (py == sel->ey && px > xx)
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->ey && px < sel->ex)
return (0);
if (sel->modekeys == MODEKEY_EMACS)
xx = sel->sx - 1;
else
xx = sel->sx;
if (py == sel->sy && (sel->sx == 0 || px > xx))
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 (sel->modekeys == MODEKEY_EMACS)
xx = sel->sx - 1;
else
xx = sel->sx;
if (px > xx || px < sel->ex)
return (0);
} else {
/* selection start (sx) is on the left */
if (sel->modekeys == MODEKEY_EMACS)
xx = (sel->ex == 0 ? 0 : sel->ex - 1);
else
xx = sel->ex;
if (px < sel->sx || px > xx)
return (0);
}
}
}
return (1);
}
/* Get selected grid cell. */
void
screen_select_cell(struct screen *s, struct grid_cell *dst,
const struct grid_cell *src)
{
if (s->sel == NULL || s->sel->hidden)
return;
memcpy(dst, &s->sel->cell, sizeof *dst);
utf8_copy(&dst->data, &src->data);
dst->attr = dst->attr & ~GRID_ATTR_CHARSET;
dst->attr |= src->attr & GRID_ATTR_CHARSET;
dst->flags = src->flags;
}
/* Reflow wrapped lines. */
static void
screen_reflow(struct screen *s, u_int new_x, u_int *cx, u_int *cy, int cursor)
{
u_int wx, wy;
if (cursor) {
grid_wrap_position(s->grid, *cx, *cy, &wx, &wy);
log_debug("%s: cursor %u,%u is %u,%u", __func__, *cx, *cy, wx,
wy);
}
grid_reflow(s->grid, new_x);
if (cursor) {
grid_unwrap_position(s->grid, cx, cy, wx, wy);
log_debug("%s: new cursor is %u,%u", __func__, *cx, *cy);
}
else {
*cx = 0;
*cy = s->grid->hsize;
}
}
/*
* Enter alternative screen mode. A copy of the visible screen is saved and the
* history is not updated.
*/
void
screen_alternate_on(struct screen *s, struct grid_cell *gc, int cursor)
{
u_int sx, sy;
if (s->saved_grid != NULL)
return;
sx = screen_size_x(s);
sy = screen_size_y(s);
s->saved_grid = grid_create(sx, sy, 0);
grid_duplicate_lines(s->saved_grid, 0, s->grid, screen_hsize(s), sy);
if (cursor) {
s->saved_cx = s->cx;
s->saved_cy = s->cy;
}
memcpy(&s->saved_cell, gc, sizeof s->saved_cell);
grid_view_clear(s->grid, 0, 0, sx, sy, 8);
s->saved_flags = s->grid->flags;
s->grid->flags &= ~GRID_HISTORY;
}
/* Exit alternate screen mode and restore the copied grid. */
void
screen_alternate_off(struct screen *s, struct grid_cell *gc, int cursor)
{
u_int sx, sy;
/*
* Restore the cursor position and cell. This happens even if not
* currently in the alternate screen.
*/
if (cursor && s->saved_cx != UINT_MAX && s->saved_cy != UINT_MAX) {
s->cx = s->saved_cx;
if (s->cx > screen_size_x(s) - 1)
s->cx = screen_size_x(s) - 1;
s->cy = s->saved_cy;
if (s->cy > screen_size_y(s) - 1)
s->cy = screen_size_y(s) - 1;
if (gc != NULL)
memcpy(gc, &s->saved_cell, sizeof *gc);
}
if (s->saved_grid == NULL)
return;
sx = screen_size_x(s);
sy = screen_size_y(s);
/*
* If the current size is bigger, temporarily resize to the old size
* before copying back.
*/
if (sy > s->saved_grid->sy)
screen_resize(s, sx, s->saved_grid->sy, 1);
/* Restore the saved grid. */
grid_duplicate_lines(s->grid, screen_hsize(s), s->saved_grid, 0, sy);
/*
* Turn history back on (so resize can use it) and then resize back to
* the current size.
*/
if (s->saved_flags & GRID_HISTORY)
s->grid->flags |= GRID_HISTORY;
if (sy > s->saved_grid->sy || sx != s->saved_grid->sx)
screen_resize(s, sx, sy, 1);
grid_destroy(s->saved_grid);
s->saved_grid = NULL;
}