Toggle yakuake’s window; if it’s not running, start it and then show the window. (So you don’t have to reopen it manually in case you accidentally closed it.)

toggle-yakuake

#!/bin/bash

# Toggle yakuake's window; if it's not running, start it and then show the window.
# (So you don't have to reopen it manually in case you accidentally closed it.)
#
# To use this script, install it to /usr/local/bin/toggle-yakuake, then disable
# yakuake's global shortcut, and create a global shortcut pointing to this script.
#
# Written by André Kugland

die() {
    if [[ -e /usr/bin/kdialog ]]; then
        kdialog --icon error --passivepopup "$1" 5
    else
        echo "$1"
    fi
    exit 1
}

YAKUAKE_BIN=/usr/bin/yakuake

if [[ ! -e "$YAKUAKE_BIN" ]]; then
    die "No executable found at '${YAKUAKE_BIN}'."
fi

# Check if yakuake's DBus interface is available
is_yakuake_ready() {
    if qdbus org.freedesktop.DBus / org.freedesktop.DBus.ListNames | fgrep org.kde.yakuake >/dev/null 2>&1; then
        return 0
    else
        return 1
    fi
}

# Wait 5s for yakuake's DBus interface to become available, pooling every 0.1s.
# If after 5s it doesn't become available, give up.
wait_for_yakuake() {
    for i in {0..50}; do
        is_yakuake_ready && return 0
        sleep .1
    done
    return 1
}

if ! is_yakuake_ready; then
    ( "$YAKUAKE_BIN" >/dev/null 2>&1 & )
    if ! wait_for_yakuake; then
        # Something went terribly wrong.
        die 'Unable to start yakuake.'
    fi
fi

qdbus org.kde.yakuake /yakuake/window org.kde.yakuake.toggleWindowState