Large module update

modules/update_background.nix

@@ -0,0 +1,45 @@
+{ pkgs, config, ... }:
+let
+  fehCmd = "${pkgs.feh}/bin/feh";
+  backgrounds_directory = ~/Immagini/Sfondi ;
+  update_time = 10;
+in {
+  home.file.".local/bin/update_background.sh" = {
+    text = ''
+      #!${pkgs.bash}/bin/bash
+      image=`find ${backgrounds_directory} -type f | grep -v "/\." | shuf -n 1`
+      ${fehCmd} --bg-fill --no-fehbg "$image"
+    '';
+    target = ".local/bin/update_background.sh";
+    executable = true;
+  };
+
+  systemd.user.services."update-background" = {
+    Unit = {
+      Description = "Update the desktop background";
+      After = [ "graphical-session.target" ];
+      PartOf = [ "graphical-session.target" ];
+      RequiresMountsFor = [ "/home/bertof/Immagini" ];
+    };
+    Install = {
+      WantedBy = [ "graphical-session.target" ];
+    };
+    Service = {
+      ExecStart = "${config.home.homeDirectory}/${config.home.file.".local/bin/update_background.sh".target}";
+    };
+  };
+
+  systemd.user.timers."update-background" = {
+    Unit = {
+      Description="Run update-background every ${toString update_time} minutes";
+      PartOf = [ "graphical-session.target" ];
+      After = [ "graphical-session.target" ];
+    };
+    Timer = {
+      OnUnitActiveSec="${toString update_time}m";
+    };
+    Install = {
+      WantedBy = [ "graphical-session.target" ];
+    };
+  };
+}