nixpkgs/modules/services/x11/xserver/desktop-managers/default.nix

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{pkgs, config, ...}:
let
inherit (pkgs.lib) mkOption mergeOneOption mkIf filter optionalString any;
cfg = config.services.xserver.desktopManager;
needBGCond = d: ! (d ? bgSupport && d.bgSupport);
in
{
require = [
./kde.nix
./kde4.nix
./gnome.nix
./xterm.nix
./none.nix
];
services = {
xserver = {
displayManager = {
session = cfg.session.list;
};
desktopManager = {
session = mkOption {
default = [];
example = [{
name = "kde";
bgSupport = true;
start = "...";
}];
description = "
Internal option used to add some common line to desktop manager
scripts before forwarding the value to the
<varname>displayManager</varname>.
";
apply = list: {
list = map (d: d // {
manage = "desktop";
start = d.start
+ optionalString (needBGCond d) ''
if test -e $HOME/.background-image; then
${pkgs.feh}/bin/feh --bg-scale $HOME/.background-image
fi
'';
}) list;
needBGPackages = [] != filter needBGCond list;
};
};
default = mkOption {
default = "xterm";
example = "none";
description = "
Default desktop manager loaded if none have been chosen.
";
merge = mergeOneOption;
apply = defaultDM:
if any (w: w.name == defaultDM) cfg.session.list then
defaultDM
else
throw "Default desktop manager ($(defaultDM)) not found.";
};
};
};
};
environment = mkIf cfg.session.needBGPackages {
extraPackages = [ pkgs.feh ];
};
}