On my current Fedora machine, no, it doesn't.
If I run "clear", with alternate-screen off, it simply destroys
what's on the screen; it doesn't go into tmux's backscroll/history
or anything, it's just *gone*.
I want this fixed so very, very badly. ;_;
It annoys me so much that I may have to switch back to GNU screen,
where I never had this problem, despite it being a worse program in
basically every other respect.
-Robin
On Mon, Aug 22, 2011 at 10:28:09PM +0100, Nicholas Marriott wrote:
> Don't we do this already? Clear screen scrolls lines into the history?
> Or do you want something else? It isn't very obvious.
>
>
>
> On Mon, Aug 22, 2011 at 10:22:16PM +0200, Fabian Groffen wrote:
> > Hi list,
> >
> > In my quest to get rid of the alternative buffer feature of todays
> > terminals, I've configured tmux with:
> >
> > set -g terminal-overrides 'xterm*:smcup@:rmcup@'
> > set -g alternate-screen off
> >
> > This basically does everything I want, except that compared to a
> > non-tmux session (with terminfo settings to remove smcup and rmcup
> > capabilities) a "clear" overwrites the existing contents of the
> > terminal. E.g. when I run Vim in tmux, I lose the information on my
> > screen, whereas outside it isn't. The \E[2J sequence triggers a full
> > clear screen, and the attached patch changes the behaviour for that
> > sequence in the tty_cmd_clearscreen function not to overwrite, but
> > rather add empty lines to make the terminal clean. This is only done
> > when alternate-screen is set to off, when this behaviour makes sense.
> >
> > Please consider the attached patch.
> >
> >
> > --
> > Fabian Groffen
> > Gentoo on a different level
>
> > # HG changeset patch
> > # User Fabian Groffen <grob...@gentoo.org>
> > # Date 1314042382 -7200
> > # Node ID 1b455a85ed6ca5e6aeea23a7152bffcc902966b3
> > # Parent 051fdc014dc5bc730e4b0eb380af8b09938dd9b8
> > tty_cmd_clearscreen: don't overwrite the buffer if alternate-screen=off
> >
> > If the alternative-screen isn't used, overwriting the buffer contents
> > loses the information that the user probably wanted to retain (hence no
> > alternate-screen). Instead, write enough newlines to clear the screen
> > and reset the cursor, such that we retain all information that was on
> > the screen before the clear.
> >
> > For example: having ls output and starting Vim won't overwrite the ls
> > output, but show the output including the vim invocation.
> >
> > diff -r 051fdc014dc5 -r 1b455a85ed6c tty.c
> > --- a/tty.c Mon Aug 22 20:14:55 2011 +0200
> > +++ b/tty.c Mon Aug 22 21:46:22 2011 +0200
> > @@ -899,24 +899,32 @@
> >
> > tty_reset(tty);
> >
> > - tty_region_pane(tty, ctx, 0, screen_size_y(s) - 1);
> > - tty_cursor_pane(tty, ctx, 0, 0);
> > + if (options_get_number(&wp->window->options, "alternate-screen")) {
> > + tty_region_pane(tty, ctx, 0, screen_size_y(s) - 1);
> > + tty_cursor_pane(tty, ctx, 0, 0);
> >
> > - if (wp->xoff == 0 && screen_size_x(s) >= tty->sx &&
> > - tty_term_has(tty->term, TTYC_EL)) {
> > - for (i = 0; i < screen_size_y(s); i++) {
> > - tty_putcode(tty, TTYC_EL);
> > - if (i != screen_size_y(s) - 1) {
> > - tty_emulate_repeat(tty, TTYC_CUD, TTYC_CUD1, 1);
> > - tty->cy++;
> > + if (wp->xoff == 0 && screen_size_x(s) >= tty->sx &&
> > + tty_term_has(tty->term, TTYC_EL)) {
> > + for (i = 0; i < screen_size_y(s); i++) {
> > + tty_putcode(tty, TTYC_EL);
> > + if (i != screen_size_y(s) - 1) {
> > + tty_emulate_repeat(tty, TTYC_CUD,
> > TTYC_CUD1, 1);
> > + tty->cy++;
> > + }
> > + }
> > + } else {
> > + for (j = 0; j < screen_size_y(s); j++) {
> > + tty_cursor_pane(tty, ctx, 0, j);
> > + for (i = 0; i < screen_size_x(s); i++)
> > + tty_putc(tty, ' ');
> > }
> > }
> > } else {
> > - for (j = 0; j < screen_size_y(s); j++) {
> > - tty_cursor_pane(tty, ctx, 0, j);
> > - for (i = 0; i < screen_size_x(s); i++)
> > - tty_putc(tty, ' ');
> > - }
> > + /* make sure we don't overwrite buffer contents, move down */
> > + for (j = 0; j < screen_size_y(s); j++)
> > + tty_putc(tty, '\n');
> > + tty_region_pane(tty, ctx, 0, screen_size_y(s) - 1);
> > + tty_cursor_pane(tty, ctx, 0, 0);
> > }
> > }
> >
>
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