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plumber-vt: document a working bash+tmux config

--- a/plumber-vt.md

+++ b/plumber-vt.md

@@ -11,9 +11,29 @@

 For the remote shell to start sending `OSC 7` messages, follow

 [these instructions](https://codeberg.org/dnkl/foot/wiki#user-content-spawning-new-terminal-instances-in-the-current-working-directory). You might want to replace `${HOSTNAME}` with `${HOSTNAME%.lan}` to get rid of `.lan` suffix, depending on how your hosts are shown in `/n/...`.

-If you intend to use `tmux`, it's required to enable the extension explicitly since `tmux` does not know what vt(1) is capable of. Example:

+If you intend to use `tmux`, it's required to pass `OSC 7` message to `vt` explicitely, by adding the following at the end of `osc7_cwd()`:

-	$ cat ~/.tmux.conf

-	set-option -s terminal-features[2] xterm*:osc7

+	if [ -n "$TMUX" ]; then

+		printf '\e]7;file://%s%s\e\\' "${HOSTNAME%.lan}" "${encoded}" > `tmux display-message -p '#{client_tty}'`

+	fi

-This option forces `tmux` to believe that your terminal emulator supports `OSC 7` extension.

+The full (confirmed to be working) strip from `.bash_profile`:

+

+	osc7_cwd() {

+	    local strlen=${#PWD}

+	    local encoded=""

+	    local pos c o

+	    for (( pos=0; pos<strlen; pos++ )); do

+	        c=${PWD:$pos:1}

+	        case "$c" in

+	            [-/:_.!\'\(\)~[:alnum:]] ) o="${c}" ;;

+	            * ) printf -v o '%%%02X' "'${c}" ;;

+	        esac

+	        encoded+="${o}"

+	    done

+	    printf '\e]7;file://%s%s\e\\' "${HOSTNAME%.lan}" "${encoded}"

+	    if [ -n "$TMUX" ]; then

+	        printf '\e]7;file://%s%s\e\\' "${HOSTNAME%.lan}" "${encoded}" > `tmux display-message -p '#{client_tty}'`

+	    fi

+	}

+	export PROMPT_COMMAND=${PROMPT_COMMAND:+$PROMPT_COMMAND; }osc7_cwd