Qube Manager & Tools: Dark Mode

Add an option in the view menu to enable/disable dark mode.

The script must be launch in a dom0 terminal.

Make sure to have only space character for python part. If you have tab character, qube manager will fail to start.

Dark mode can be set in the qube-manager config file: $HOME/.config/The Qubes Project/qubes-qube-manager.conf 

[view]
darkmode=true

Stylesheet

Colors are based on Arc-Dark theme. You can extract the css file from your theme with gresource. 

qubes_cfg_dir="$HOME/.config//The Qubes Project/"
dark_stylesheet=dark-stylesheet.css
echo '
QMenu {
    border: 1px solid #252A32;
}

::separator {
    background-color: #475970;
    height: 1px;
    width: 1px;
}

:disabled {
    color: gray;
}

::tab:!selected {
    background-color: #2F343F;
}

::tab:!selected:hover {
    background-color: #505666;
}

* {
    color: #D3DAE3;
    background-color: #383C4A;
    alternate-background-color: #404552;
    selection-background-color: #5294E2;
}' > "$qubes_cfg_dir/$dark_stylesheet"

Function

Terms to feed to your favorite search engine: - bash sed - bash <() - bash function $# - bash function $@ - bash if [[ ]] - bash recursive function

Bash command &lt;() doesn't handle sudo. Just like file redirection (text &gt; file) doesn't.

A backup file is made for each file! 

python_version=$(python3 --version | grep -Eo '[0-9]+\.[0-9]+')
qm_dir=/usr/lib/python$python_version/site-packages/qubesmanager/
add_data_after_pattern ()
{
    handle_data ()
    {
        if [[ $# -ne 1 ]]
        then
            sed -i -E "/$2/ r"&lt;(echo "$3") $1
            handle_data $1 "${@:4}"
        fi
    }
    local qtool=$qm_dir/$1
    local qtmp=$HOME/$1

    if [ ! -f $qtool.bak ]; then
        sudo cp $qtool $qtool.bak
    fi
    sudo cp $qtool $qtmp
    sudo chown user:user $qtmp

    handle_data $qtmp "${@:2}"

    sudo mv $qtmp $qtool
    sudo chown root:root $qtool
}

Qubes tools

If setting is set to dark mode, use our css stylesheet. 

add_dark_mode ()
{
    local qm_darkmode="
        if not parent:
            manager_settings = QtCore.QSettings(
                'The Qubes Project', 'qubes-qube-manager')
        else:
            manager_settings = QtCore.QSettings(self)
        if manager_settings.value('view/darkmode',
                                  defaultValue='false') != 'false':
            qubes_cfg_dir = '$qubes_cfg_dir'
            stylesheet = open(qubes_cfg_dir + '$dark_stylesheet', 'r')
            self.setStyleSheet(stylesheet.read())
            stylesheet.close()"
    for qtool_file in $@
    do
        add_data_after_pattern $qtool_file 'setupUi' "$qm_darkmode"
    done
}
add_dark_mode \
    global_settings.py \
    settings.py \
    template_manager.py \
    create_new_vm.py \
    clone_vm.py \
    backup.py \
    restore.py \
    log_dialog.py

sudo sed -i 's/^from PyQt5 import /&amp;QtCore, /' $qm_dir/log_dialog.py

Qube manager

Add a toggle option in the view menu. 

qm_set_darkmode="
    @pyqtSlot(bool)
    def on_action_dark_mode_toggled(self, checked):
        if checked:
            qubes_cfg_dir = '$qubes_cfg_dir'
            stylesheet = open(qubes_cfg_dir + '$dark_stylesheet', 'r')
            self.setStyleSheet(stylesheet.read())
            stylesheet.close()
        else:
            self.setStyleSheet('')
        if self.settings_loaded:
            self.manager_settings.setValue('view/darkmode', checked)"

qm_menu () {
    echo "        self.menu_view.addAction(self.$1)"
}
qm_darkmode_menu=$(qm_menu action_dark_mode)

qm_restore () {
    echo "
        if self.manager_settings.value('$1',
                                       defaultValue='false') != 'false':
            self.action_dark_mode.setChecked(True)"
}
qm_darkmode_restore=$(qm_restore 'view/darkmode')

add_data_after_pattern qube_manager.py \
    'self\.close' "$qm_set_darkmode" \
    'compact_view\.setChecked' "$qm_darkmode_restore" \
    'Action\(self\.action_compact_view' "$qm_darkmode_menu"

Create the Qt widget to handle dark mode. (Qt is the gui framework) 

qm_widget () {
    echo "
        self.$1 = QtWidgets.QAction(VmManagerWindow)
        self.$1.setCheckable(True)
        self.$1.setChecked($2)
        self.$1.setObjectName('$1')"
}
qm_darkmode_widget=$(qm_widget action_dark_mode 'False')

qm_text () {
    echo "        self.$1.$2(_translate('VmManagerWindow', '$3'))"
}
qm_darkmode_text=$(qm_text action_dark_mode setText 'Dark mode')

add_data_after_pattern ui_qubemanager.py \
    '"action_compact_view"' "$qm_darkmode_widget" \
    'Compact view' "$qm_darkmode_text"

Note

qube manager version: 4.1.25-1 Dark mode will be erase if qube manager get updated.