way-displays: init module (#6791)

modules/misc/news.nix

@@ -57,7 +57,13 @@ let
   isNixFile = n: v: v == "regular" && lib.hasSuffix ".nix" n;
   # builtins.attrNames return the values in alphabetical order
   newsFiles = builtins.attrNames (lib.filterAttrs isNixFile (builtins.readDir ./news));
-  newsEntries = builtins.map (newsFile: import (./news + "/${newsFile}")) newsFiles;
+  newsEntries = builtins.map (
+    newsFile:
+    let
+      imported = import (./news + "/${newsFile}");
+    in
+    if builtins.isFunction imported then imported { inherit pkgs; } else imported
+  ) newsFiles;
 in
 {
   meta.maintainers = [ lib.maintainers.rycee ];

modules/misc/news/2025-04-10_10-10-18.nix

@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+
+{
+  time = "2025-04-10T08:10:18+00:00";
+  condition = pkgs.stdenv.hostPlatform.isLinux;
+  message = ''
+    A new module is available: 'services.way-displays'.
+
+    A service to automatically configure your displays on wlroots-based
+    wayland compositors.
+  '';
+}

modules/modules.nix

@@ -435,6 +435,7 @@ let
       ./services/unison.nix
       ./services/vdirsyncer.nix
       ./services/volnoti.nix
+      ./services/way-displays.nix
       ./services/window-managers/awesome.nix
       ./services/window-managers/bspwm/default.nix
       ./services/window-managers/fluxbox.nix

modules/services/way-displays.nix

@@ -0,0 +1,112 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  inherit (lib)
+    attrsets
+    lists
+    literalExpression
+    maintainers
+    mkEnableOption
+    mkIf
+    mkOption
+    types
+    ;
+  mergeSets = sets: lists.fold attrsets.recursiveUpdate { } sets;
+  cfg = config.services.way-displays;
+  yaml = pkgs.formats.yaml { };
+in
+{
+  meta.maintainers = [ maintainers.jolars ];
+
+  options.services.way-displays = {
+    enable = mkEnableOption "way-displays";
+
+    package = lib.mkPackageOption pkgs "way-displays" { };
+
+    settings = mkOption {
+      type = yaml.type;
+      default = { };
+      example = literalExpression ''
+        {
+          ORDER = [
+            "DP-2"
+            "Monitor Maker ABC123"
+            "!^my_regex_here[0-9]+"
+            "'!.*$'"
+          ];
+          SCALING = false;
+          MODE = [
+            {
+              NAME_DESC = "HDMI-A-1";
+              WIDTH = 1920;
+              HEIGHT = 1080;
+              HZ = 60;
+            }
+          ];
+          TRANSFORM = [
+            {
+              NAME_DESC = "eDP-1"
+              TRANSFORM = "FLIPPED-90";
+            }
+          ];
+        };
+      '';
+      description = ''
+        The way-displays configuration written to
+        {file}`$XDG_CONFIG_HOME/way-displays/cfg.yml`. See
+        <https://github.com/alex-courtis/way-displays/wiki/Configuration> for a
+        description of available options.
+      '';
+    };
+
+    systemdTarget = mkOption {
+      type = types.str;
+      default = config.wayland.systemd.target;
+      defaultText = literalExpression "config.wayland.systemd.target";
+      description = ''
+        Systemd target to bind to.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.way-displays" pkgs lib.platforms.linux)
+    ];
+
+    xdg.configFile."way-displays/cfg.yaml".source =
+      yaml.generate "way-displays-config.yaml"
+        (mergeSets [
+          {
+            CALLBACK_CMD = lib.mkDefault "${pkgs.libnotify}/bin/notify-send \"way-displays \${CALLBACK_LEVEL}\" \"\${CALLBACK_MSG}\"";
+          }
+          cfg.settings
+        ]);
+
+    systemd.user.services.way-displays = {
+      Unit = {
+        Description = "Display configuration service";
+        Documentation = "man:way-displays(1)";
+        ConditionEnvironment = "WAYLAND_DISPLAY";
+        PartOf = cfg.systemdTarget;
+        Requires = cfg.systemdTarget;
+        After = cfg.systemdTarget;
+      };
+
+      Install = {
+        WantedBy = [ cfg.systemdTarget ];
+      };
+
+      Service = {
+        Type = "simple";
+        ExecStart = "${lib.getExe cfg.package}";
+        Restart = "always";
+      };
+    };
+  };
+}