CDE
Aka cdesktopenv or Common Desktop Environment is a vintage desktop environment.
Enabling
/etc/nixos/configuration.nix
services.xserver.desktopManager.cde.enable = true;
Changing fonts
sudo mkdir -p /etc/dt/config/xfonts
sudo cp -r ${pkgs.cdesktopenv}/opt/dt/appconfig/types/C /etc/dt/config/xfonts
sudo cp -r ${pkgs.cdesktopenv}/opt/dt/appconfig/types/en_US.UTF-8 /etc/dt/config/xfonts
Now edit /etc/dt/config/xfonts/*/fonts.alias and remove all -dt-interface references. Add these instead. In this example Helvetica and Courier are used instead of fixed fonts.
"-dt-interface system-medium-r-normal-xxs sans-10-100-72-72-p-61-iso8859-1" "-adobe-helvetica-medium-r-normal--10-*-75-75-p-56-iso8859-1" "-dt-interface system-medium-r-normal-xs sans-11-110-72-72-p-64-iso8859-1" "-adobe-helvetica-medium-r-normal--11-80-100-100-p-56-iso8859-1" "-dt-interface system-medium-r-normal-s sans-12-120-72-72-p-73-iso8859-1" "-adobe-helvetica-medium-r-normal--12-120-75-75-p-67-iso8859-1" "-dt-interface system-medium-r-normal-m sans-13-130-72-72-p-87-iso8859-1" "-adobe-helvetica-medium-r-normal--14-140-75-75-p-77-iso8859-1" "-dt-interface system-medium-r-normal-l sans-15-150-72-72-p-100-iso8859-1" "-adobe-helvetica-medium-r-normal--14-140-75-75-p-77-iso8859-1" "-dt-interface system-medium-r-normal-xl sans-18-180-72-72-p-114-iso8859-1" "-adobe-helvetica-medium-r-normal--18-180-75-75-p-98-iso8859-1" "-dt-interface system-medium-r-normal-xxl sans-21-210-72-72-p-123-iso8859-1" "-adobe-helvetica-medium-r-normal--20-140-100-100-p-100-iso8859-1" "-dt-interface user-medium-r-normal-xxs serif-10-100-72-72-m-60-iso8859-1" "-adobe-courier-medium-r-normal--10-100-75-75-m-60-iso8859-1" "-dt-interface user-medium-r-normal-xs serif-11-110-72-72-m-60-iso8859-1" "-adobe-courier-medium-r-normal--11-80-100-100-m-60-iso8859-1" "-dt-interface user-medium-r-normal-s serif-12-120-72-72-m-80-iso8859-1" "-adobe-courier-medium-r-normal--12-120-75-75-m-70-iso8859-1" "-dt-interface user-medium-r-normal-m serif-13-130-72-72-m-90-iso8859-1" "-adobe-courier-medium-r-normal--14-140-75-75-m-90-iso8859-1" "-dt-interface user-medium-r-normal-l serif-15-150-72-72-m-110-iso8859-1" "-adobe-courier-medium-r-normal--14-140-75-75-m-90-iso8859-1" "-dt-interface user-medium-r-normal-xl serif-18-180-72-72-m-120-iso8859-1" "-adobe-courier-medium-r-normal--18-180-75-75-m-110-iso8859-1" "-dt-interface user-medium-r-normal-xxl serif-21-210-72-72-m-140-iso8859-1" "-adobe-courier-medium-r-normal-*-20-140-100-100-m-110-iso8859-1" "-dt-interface user-bold-r-normal-xxs serif-10-100-72-72-m-60-iso8859-1" "-adobe-courier-bold-r-normal--10-100-75-75-m-60-iso8859-1" "-dt-interface user-bold-r-normal-xs serif-11-110-72-72-m-60-iso8859-1" "-adobe-courier-bold-r-normal--11-80-100-100-m-60-iso8859-1" "-dt-interface user-bold-r-normal-s serif-12-120-72-72-m-80-iso8859-1" "-adobe-courier-bold-r-normal--12-120-75-75-m-70-iso8859-1" "-dt-interface user-bold-r-normal-m serif-13-130-72-72-m-90-iso8859-1" "-adobe-courier-bold-r-normal--14-140-75-75-m-90-iso8859-1" "-dt-interface user-bold-r-normal-l serif-15-150-72-72-m-110-iso8859-1" "-adobe-courier-bold-r-normal--14-140-75-75-m-90-iso8859-1" "-dt-interface user-bold-r-normal-xl serif-18-180-72-72-m-120-iso8859-1" "-adobe-courier-bold-r-normal--18-180-75-75-m-110-iso8859-1" "-dt-interface user-bold-r-normal-xxl serif-21-210-72-72-m-140-iso8859-1" "-adobe-courier-bold-r-normal--20-140-100-100-m-110-iso8859-1"
Adding programs to autolaunch
~/.dt/sessions/sessionetc
autorandr -l docked
xcompmgr -c &
chmod +x ~/.dt/sessions/sessionetc
Editing panel
cp ${pkgs.cdesktopenv}/opt/dt/appconfig/types/C/dtwm.fp ~/.dt/types
chmod +w ~/.dt/types/dtwm.fp
Now edit ~/.dt/types/dtwm.fp
To disable system control, add a delete property like this
CONTROL Trash
{
CONTAINER_NAME Top
CONTAINER_TYPE BOX
DELETE True
}
Creating an own program icon
Use Desktop_Apps/Create Action tool. Save actions under ~/.dt/appmanager. Save icons under ~/.dt/icons
The icons must be in XPM or XBM format and they need to be in three sizes: 48x48, 32x32 and 16x16. Create three separate icons as each will be "consumed" when you use them in Create Action. I used The Gimp to create the three icons I needed. Examples are under ${pkgs.cdesktopenv}/opt/dt/appconfig/icons/C
Own wallpapers
Put .jpg or .png under ~/.dt/backdrops then select it in Style Manager / Backdrop