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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