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home-manager/modules/services/random-background.nix
2017-06-26 18:42:27 +02:00

76 lines
1.8 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.random-background;
in
{
options = {
services.random-background = {
enable = mkEnableOption "random desktop background";
imageDirectory = mkOption {
type = types.str;
description =
''
The directory of images from which a background should be
chosen. Should be formatted in a way understood by
systemd, e.g., '%h' is the home directory.
'';
};
interval = mkOption {
default = null;
type = types.nullOr types.str;
description = ''
The duration between changing background image, set to null
to only set background when logging in.
Should be formatted as a duration understood by systemd.
'';
};
};
};
config = mkIf cfg.enable (
mkMerge ([
{
systemd.user.services.random-background = {
Unit = {
Description = "Set random desktop background using feh";
After = [ "graphical-session-pre.target" ];
PartOf = [ "graphical-session.target" ];
};
Service = {
Type = "oneshot";
ExecStart = "${pkgs.feh}/bin/feh --randomize --bg-fill ${cfg.imageDirectory}";
IOSchedulingClass = "idle";
};
Install = {
WantedBy = [ "graphical-session.target" ];
};
};
}
(mkIf (cfg.interval != null) {
systemd.user.timers.random-background = {
Unit = {
Description = "Set random desktop background using feh";
};
Timer = {
OnUnitActiveSec = cfg.interval;
};
Install = {
WantedBy = [ "timers.target" ];
};
};
})
]));
}