wallpaper engine

2026-10-07 09:04:09 +09:00 · 2026-08-04 16:58:40 +09:00
parent 5fb55f2e6a
commit 1b4a5fa5a2
7 changed files with 429 additions and 1 deletions
@@ -0,0 +1,158 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  settings = import ../settings.nix;
+  inherit (settings)
+    assetsDirectory
+    fps
+    mute
+    scaling
+    selectedWallpaperId
+    switchIntervalSeconds
+    wallpaperIds
+    workshopDirectory
+    ;
+
+  resolveHomePath =
+    path:
+    if lib.hasPrefix "~/" path then
+      "${config.home.homeDirectory}/${lib.removePrefix "~/" path}"
+    else if lib.hasPrefix "/" path then
+      path
+    else
+      "${config.home.homeDirectory}/${path}";
+
+  hasWallpapers = wallpaperIds != [ ];
+  defaultWallpaperId =
+    if selectedWallpaperId != null then
+      selectedWallpaperId
+    else if hasWallpapers then
+      lib.head wallpaperIds
+    else
+      "";
+  configurationId = builtins.hashString "sha256" (builtins.toJSON settings);
+  resolvedAssetsDirectory = resolveHomePath assetsDirectory;
+  resolvedWorkshopDirectory = resolveHomePath workshopDirectory;
+  playlist = pkgs.writeText "linux-wallpaperengine-playlist" (
+    lib.concatMapStringsSep "\n" (id: id) wallpaperIds + "\n"
+  );
+  engineArguments = lib.optional mute "--silent" ++ [
+    "--fps"
+    (toString fps)
+  ];
+
+  controller = pkgs.writeShellApplication {
+    name = "wallpaperengine-wallpaper";
+    runtimeInputs = [
+      pkgs.coreutils
+      pkgs.gawk
+      pkgs.systemd
+    ];
+    text = ''
+      exec ${lib.getExe pkgs.bash} ${./controller.sh} \
+        ${lib.escapeShellArg playlist} \
+        ${lib.escapeShellArg defaultWallpaperId} \
+        ${lib.escapeShellArg configurationId} \
+        "$@"
+    '';
+  };
+
+  launcher = pkgs.writeShellApplication {
+    name = "linux-wallpaperengine-launcher";
+    runtimeInputs = [
+      pkgs.coreutils
+      pkgs.gawk
+      pkgs.jq
+      pkgs.linux-wallpaperengine
+      pkgs.wlr-randr
+    ];
+    text = ''
+      exec ${lib.getExe pkgs.bash} ${./launcher.sh} \
+        ${lib.escapeShellArg playlist} \
+        ${lib.escapeShellArg defaultWallpaperId} \
+        ${lib.escapeShellArg configurationId} \
+        ${lib.escapeShellArg resolvedAssetsDirectory} \
+        ${lib.escapeShellArg resolvedWorkshopDirectory} \
+        ${lib.escapeShellArg scaling} \
+        ${lib.escapeShellArgs engineArguments}
+    '';
+  };
+in
+assert lib.assertMsg (lib.all (
+  id: builtins.isString id && builtins.match "[0-9]+" id != null
+) wallpaperIds) "linux-wallpaperengine: wallpaperIds must contain only numeric strings";
+assert lib.assertMsg (
+  lib.unique wallpaperIds == wallpaperIds
+) "linux-wallpaperengine: wallpaperIds must not contain duplicates";
+assert lib.assertMsg (
+  selectedWallpaperId == null || builtins.elem selectedWallpaperId wallpaperIds
+) "linux-wallpaperengine: selectedWallpaperId must be null or a member of wallpaperIds";
+assert lib.assertMsg (
+  switchIntervalSeconds == null || (builtins.isInt switchIntervalSeconds && switchIntervalSeconds > 0)
+) "linux-wallpaperengine: switchIntervalSeconds must be null or a positive integer";
+assert lib.assertMsg (
+  builtins.isInt fps && fps > 0
+) "linux-wallpaperengine: fps must be a positive integer";
+assert lib.assertMsg (
+  builtins.isString assetsDirectory && assetsDirectory != ""
+) "linux-wallpaperengine: assetsDirectory must be a non-empty string";
+assert lib.assertMsg (
+  builtins.isString workshopDirectory && workshopDirectory != ""
+) "linux-wallpaperengine: workshopDirectory must be a non-empty string";
+assert lib.assertMsg (builtins.elem scaling [
+  "default"
+  "fill"
+  "fit"
+  "stretch"
+]) "linux-wallpaperengine: scaling must be default, fill, fit, or stretch";
+{
+  home.packages = [
+    controller
+    pkgs.linux-wallpaperengine
+  ];
+
+  systemd.user.services = lib.optionalAttrs hasWallpapers {
+    linux-wallpaperengine = {
+      Unit = {
+        Description = "Linux Wallpaper Engine";
+        After = [ "graphical-session.target" ];
+        PartOf = [ "graphical-session.target" ];
+      };
+      Service = {
+        ExecStart = lib.getExe launcher;
+        Restart = "on-abnormal";
+      };
+      Install.WantedBy = [ "graphical-session.target" ];
+    };
+
+    linux-wallpaperengine-switch = {
+      Unit.Description = "Switch Linux Wallpaper Engine wallpaper";
+      Service = {
+        Type = "oneshot";
+        ExecStart = "${lib.getExe controller} next";
+      };
+    };
+  };
+
+  systemd.user.timers =
+    lib.optionalAttrs
+      (hasWallpapers && builtins.length wallpaperIds > 1 && switchIntervalSeconds != null)
+      {
+        linux-wallpaperengine-switch = {
+          Unit = {
+            Description = "Periodically switch Linux Wallpaper Engine wallpaper";
+            PartOf = [ "graphical-session.target" ];
+          };
+          Timer = {
+            OnActiveSec = "${toString switchIntervalSeconds}s";
+            OnUnitActiveSec = "${toString switchIntervalSeconds}s";
+            Unit = "linux-wallpaperengine-switch.service";
+          };
+          Install.WantedBy = [ "graphical-session.target" ];
+        };
+      };
+}