Make less known wayland compositors usable (#32285)

* bemenu: init at 2017-02-14

* velox: 2015-11-03 -> 2017-07-04

* orbment, velox: don't expose subprojects

the development of orbment and velox got stuck
their subprojects (bemenu, dmenu-wayland, st-wayland) don't work correctly outside of parent projects
so hide them to not confuse people
swc and wld libraries are unpopular and unlike wlc are not used by anything except velox

* pythonPackages.pydbus: init at 0.6.0

* way-cooler: 0.5.2 -> 0.6.2

* nixos/way-cooler: add module

* dconf module: use for wayland

non-invasive approach for #31293
see discussion at #32210

* sway: embed LD_LIBRARY_PATH for #32755

* way-cooler: switch from buildRustPackage to buildRustCrate #31150

nixos/modules/programs/dconf.nix

@@ -1,7 +1,8 @@
-{ config, lib, ... }:
+{ config, lib, pkgs, ... }:
+
+with lib;
 
 let
-  inherit (lib) mkOption mkIf types mapAttrsToList;
   cfg = config.programs.dconf;
 
   mkDconfProfile = name: path:
@@ -13,6 +14,7 @@ in
 
   options = {
     programs.dconf = {
+      enable = mkEnableOption "dconf";
 
       profiles = mkOption {
         type = types.attrsOf types.path;
@@ -26,9 +28,15 @@ in
 
   ###### implementation
 
-  config = mkIf (cfg.profiles != {}) {
-    environment.etc =
+  config = mkIf (cfg.profiles != {} || cfg.enable) {
+    environment.etc = optionals (cfg.profiles != {})
       (mapAttrsToList mkDconfProfile cfg.profiles);
+
+    environment.variables.GIO_EXTRA_MODULES = optional cfg.enable
+      "${pkgs.gnome3.dconf.lib}/lib/gio/modules";
+    # https://github.com/NixOS/nixpkgs/pull/31891
+    #environment.variables.XDG_DATA_DIRS = optional cfg.enable
+    #  "$(echo ${pkgs.gnome3.gsettings_desktop_schemas}/share/gsettings-schemas/gsettings-desktop-schemas-*)";
   };
 
 }

nixos/modules/programs/sway.nix

@@ -6,8 +6,7 @@ let
   cfg = config.programs.sway;
   sway = pkgs.sway;
 
-  swayWrapped = pkgs.writeScriptBin "sway" ''
-    #! ${pkgs.stdenv.shell}
+  swayWrapped = pkgs.writeShellScriptBin "sway" ''
     if [ "$1" != "" ]; then
       sway-setcap "$@"
       exit
@@ -65,8 +64,10 @@ in
     };
 
     users.extraGroups.sway = {};
+    security.pam.services.swaylock = {};
 
     hardware.opengl.enable = mkDefault true;
     fonts.enableDefaultFonts = mkDefault true;
+    programs.dconf.enable = mkDefault true;
   };
 }

nixos/modules/programs/way-cooler.nix

@@ -0,0 +1,78 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+  cfg = config.programs.way-cooler;
+  way-cooler = pkgs.way-cooler;
+
+  wcWrapped = pkgs.writeShellScriptBin "way-cooler" ''
+    ${cfg.extraSessionCommands}
+    exec ${pkgs.dbus.dbus-launch} --exit-with-session ${way-cooler}/bin/way-cooler
+  '';
+  wcJoined = pkgs.symlinkJoin {
+    name = "way-cooler-wrapped";
+    paths = [ wcWrapped way-cooler ];
+  };
+  configFile = readFile "${way-cooler}/etc/way-cooler/init.lua";
+  spawnBar = ''
+    util.program.spawn_at_startup("lemonbar");
+  '';
+in
+{
+  options.programs.way-cooler = {
+    enable = mkEnableOption "way-cooler";
+
+    extraSessionCommands = mkOption {
+      default     = "";
+      type        = types.lines;
+      example = ''
+        export XKB_DEFAULT_LAYOUT=us,de
+        export XKB_DEFAULT_VARIANT=,nodeadkeys
+        export XKB_DEFAULT_OPTIONS=grp:caps_toggle,
+      '';
+      description = ''
+        Shell commands executed just before way-cooler is started.
+      '';
+    };
+
+    extraPackages = mkOption {
+      type = with types; listOf package;
+      default = with pkgs; [
+        westonLite xwayland dmenu
+      ];
+      example = literalExample ''
+        with pkgs; [
+          westonLite xwayland dmenu
+        ]
+      '';
+      description = ''
+        Extra packages to be installed system wide.
+      '';
+    };
+
+    enableBar = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Whether to enable an unofficial bar.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ wcJoined ] ++ cfg.extraPackages;
+
+    security.pam.services.wc-lock = {};
+    environment.etc."way-cooler/init.lua".text = ''
+      ${configFile}
+      ${optionalString cfg.enableBar spawnBar}
+    '';
+
+    hardware.opengl.enable = mkDefault true;
+    fonts.enableDefaultFonts = mkDefault true;
+    programs.dconf.enable = mkDefault true;
+  };
+
+  meta.maintainers = with maintainers; [ gnidorah ];
+}