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Thanks to Richard B for pointing out that xterm has its own variants

Browse Source 
of the alternate-screen and save-cursor control sequences, with
subtly different semantics and entertaining interactions with the
usual ones. No thanks to xterm for doing so in the first place :-(
This checkin should sort it all out.

[originally from svn r2112]
This commit is contained in:
Simon Tatham 2002-10-22 10:31:23 +00:00
parent d32e06c1fe
commit bf0e8374f2
1 changed files with 90 additions and 49 deletions
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139
terminal.c
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@ -205,7 +205,7 @@ static int paste_len, paste_pos, paste_hold;
*/
static void do_paint(Context, int);
static void erase_lots(int, int, int);
static void swap_screen(int);
static void swap_screen(int, int, int);
static void update_sbar(void);
static void deselect(void);
static void term_print_finish(void);
@ -312,9 +312,9 @@ static void power_on(void)
wordness[i] = cfg.wordness[i];
}
if (screen) {
swap_screen(1);
swap_screen(1, FALSE, FALSE);
erase_lots(FALSE, TRUE, TRUE);
swap_screen(0);
swap_screen(0, FALSE, FALSE);
erase_lots(FALSE, TRUE, TRUE);
}
}
@ -393,7 +393,7 @@ void term_pwron(void)
void term_reconfig(void)
{
if (cfg.no_alt_screen)
swap_screen(0);
swap_screen(0, FALSE, FALSE);
if (cfg.no_mouse_rep) {
xterm_mouse = 0;
set_raw_mouse_mode(0);
@ -454,7 +454,7 @@ void term_size(int newrows, int newcols, int newsavelines)
return; /* nothing to do */
deselect();
swap_screen(0);
swap_screen(0, FALSE, FALSE);
alt_t = marg_t = 0;
alt_b = marg_b = newrows - 1;
@ -557,7 +557,7 @@ void term_size(int newrows, int newcols, int newsavelines)
savelines = newsavelines;
fix_cpos;
swap_screen(save_alt_which);
swap_screen(save_alt_which, FALSE, FALSE);
update_sbar();
term_update();
@ -565,56 +565,76 @@ void term_size(int newrows, int newcols, int newsavelines)
}
/*
* Swap screens.
* Swap screens. If `reset' is TRUE and we have been asked to
* switch to the alternate screen, we must bring most of its
* configuration from the main screen and erase the contents of the
* alternate screen completely. (This is even true if we're already
* on it! Blame xterm.)
*/
static void swap_screen(int which)
static void swap_screen(int which, int reset, int keep_cur_pos)
{
int t;
tree234 *ttr;
if (which == alt_which)
return;
if (!which)
reset = FALSE; /* do no weird resetting if which==0 */
alt_which = which;
if (which != alt_which) {
alt_which = which;
ttr = alt_screen;
alt_screen = screen;
screen = ttr;
t = curs.x;
curs.x = alt_x;
alt_x = t;
t = curs.y;
curs.y = alt_y;
alt_y = t;
t = marg_t;
marg_t = alt_t;
alt_t = t;
t = marg_b;
marg_b = alt_b;
alt_b = t;
t = dec_om;
dec_om = alt_om;
alt_om = t;
t = wrap;
wrap = alt_wrap;
alt_wrap = t;
t = wrapnext;
wrapnext = alt_wnext;
alt_wnext = t;
t = insert;
insert = alt_ins;
alt_ins = t;
t = cset;
cset = alt_cset;
alt_cset = t;
t = utf;
utf = alt_utf;
alt_utf = t;
t = sco_acs;
sco_acs = alt_sco_acs;
alt_sco_acs = t;
ttr = alt_screen;
alt_screen = screen;
screen = ttr;
t = curs.x;
if (!reset && !keep_cur_pos)
curs.x = alt_x;
alt_x = t;
t = curs.y;
if (!reset && !keep_cur_pos)
curs.y = alt_y;
alt_y = t;
t = marg_t;
if (!reset) marg_t = alt_t;
alt_t = t;
t = marg_b;
if (!reset) marg_b = alt_b;
alt_b = t;
t = dec_om;
if (!reset) dec_om = alt_om;
alt_om = t;
t = wrap;
if (!reset) wrap = alt_wrap;
alt_wrap = t;
t = wrapnext;
if (!reset) wrapnext = alt_wnext;
alt_wnext = t;
t = insert;
if (!reset) insert = alt_ins;
alt_ins = t;
t = cset;
if (!reset) cset = alt_cset;
alt_cset = t;
t = utf;
if (!reset) utf = alt_utf;
alt_utf = t;
t = sco_acs;
if (!reset) sco_acs = alt_sco_acs;
alt_sco_acs = t;
}
fix_cpos;
if (reset && screen) {
/*
* Yes, this _is_ supposed to honour background-colour-erase.
*/
erase_lots(FALSE, TRUE, TRUE);
}
/*
* This might not be possible if we're called during
* initialisation.
*/
if (screen)
fix_cpos;
}
/*
@ -988,7 +1008,7 @@ static void toggle_mode(int mode, int query, int state)
case 47: /* alternate screen */
compatibility(OTHER);
deselect();
swap_screen(cfg.no_alt_screen ? 0 : state);
swap_screen(cfg.no_alt_screen ? 0 : state, FALSE, FALSE);
disptop = 0;
break;
case 1000: /* xterm mouse 1 */
@ -999,6 +1019,27 @@ static void toggle_mode(int mode, int query, int state)
xterm_mouse = state ? 2 : 0;
set_raw_mouse_mode(state);
break;
case 1047: /* alternate screen */
compatibility(OTHER);
deselect();
swap_screen(cfg.no_alt_screen ? 0 : state, TRUE, TRUE);
disptop = 0;
break;
case 1048: /* save/restore cursor */
save_cursor(state);
if (!state) seen_disp_event = TRUE;
break;
case 1049: /* cursor & alternate screen */
if (state)
save_cursor(state);
if (!state) seen_disp_event = TRUE;
compatibility(OTHER);
deselect();
swap_screen(cfg.no_alt_screen ? 0 : state, TRUE, FALSE);
if (!state)
save_cursor(state);
disptop = 0;
break;
} else
switch (mode) {
case 4: /* set insert mode */