treewide: simplify and standardize testbeds

Simplify and standardize testbeds by replacing
config.stylix.testbed.ui.application declarations with
config.stylix.testbed.ui.command, and replacing

    stylix.testbed.ui.command = {
      packages = [ package ];
      text = package.meta.mainProgram;
    };

with

    stylix.testbed.ui.command.packages = [ package ];

by trivially deducing config.stylix.testbed.ui.command.text from
config.stylix.testbed.ui.command.packages.

Leverage the default programs."<PACKAGE">.package value to simplify

    let
      package = pkgs."<PACKAGE>";
    in
    {
      stylix.testbed.ui.command.packages = [ package ];

      home-manager.sharedModules = lib.singleton {
        programs."<PACKAGE>" = {
          inherit package;
          enable = true;
        };
      };
    }

to

    {
      stylix.testbed.ui.command.text = "<PACKAGE_META_MAIN_PROGRAM>";

      home-manager.sharedModules = lib.singleton {
        programs."<PACKAGE>".enable = true;
      };
    }

Minor stylistic changes are made to standardize testbed declarations.

Author: trueNAHO

doc/src/testbeds.md

@@ -36,13 +36,12 @@ uses.
       graphical environments.
     - `command` takes a command to be run once the graphical environment
       has loaded
-      - `text` takes the string of the command
+      - `packages` are forwarded to `environment.systemPackages`
+      - `text` takes the string of the command, which is deduced from
+        `config.stylix.testbed.ui.command.packages` when it contains one
+        package.
       - `useTerminal` takes a boolean which determines whether the command
         should be run in a terminal
-    - `application` takes a desktop application to be run once the graphical
-      environment has loaded. If one of its suboptions is set, all must be.
-      - `name` takes the string name of the desktop application
-      - `package` takes the package which provides the `.desktop` file
 
 ### Home Manager
 

modules/alacritty/testbeds/alacritty.nix

@@ -1,17 +1,8 @@
-{ lib, pkgs, ... }:
-let
-  package = pkgs.alacritty;
-in
+{ lib, ... }:
 {
-  stylix.testbed.ui.application = {
-    name = "Alacritty";
-    inherit package;
-  };
+  stylix.testbed.ui.command.text = "alacritty";
 
   home-manager.sharedModules = lib.singleton {
-    programs.alacritty = {
-      enable = true;
-      inherit package;
-    };
+    programs.alacritty.enable = true;
   };
 }

modules/ashell/testbeds/ashell.nix

@@ -1,8 +1,8 @@
 { lib, ... }:
 {
   stylix.testbed.ui = {
-    graphicalEnvironment = "hyprland";
     command.text = "ashell";
+    graphicalEnvironment = "hyprland";
   };
 
   home-manager.sharedModules = lib.singleton {

modules/bat/testbeds/bat.nix

@@ -1,10 +1,11 @@
-{ lib, pkgs, ... }:
-let
-  package = pkgs.bat;
-in
+{ lib, ... }:
 {
-  environment = {
-    loginShellInit = "${lib.getExe package} flake-parts/flake.nix";
-    systemPackages = [ package ];
+  stylix.testbed.ui.command = {
+    text = "bat flake-parts/flake.nix";
+    useTerminal = true;
+  };
+
+  home-manager.sharedModules = lib.singleton {
+    programs.bat.enable = true;
   };
 }

modules/blender/testbeds/blender.nix

@@ -1,12 +1,4 @@
 { pkgs, ... }:
-let
-  package = pkgs.blender;
-in
 {
-  stylix.testbed.ui.application = {
-    name = "blender";
-    inherit package;
-  };
-
-  environment.systemPackages = [ package ];
+  stylix.testbed.ui.command.packages = [ pkgs.blender ];
 }

modules/bspwm/testbeds/bspwm.nix

@@ -1,12 +1,7 @@
 { pkgs, ... }:
 {
   stylix.testbed.ui = {
+    command.packages = [ pkgs.kitty ];
     graphicalEnvironment = "bspwm";
-
-    # We need something to open a window so that we can check the window borders
-    application = {
-      name = "kitty";
-      package = pkgs.kitty;
-    };
   };
 }

modules/btop/testbeds/btop.nix

@@ -1,7 +1,7 @@
-{ lib, pkgs, ... }:
+{ lib, ... }:
 {
   stylix.testbed.ui.command = {
-    text = lib.getExe pkgs.btop;
+    text = "btop";
     useTerminal = true;
   };
 

modules/cava/testbeds/cava-rainbow.nix

@@ -1,10 +1,8 @@
 { lib, pkgs, ... }:
 {
   stylix.testbed.ui.command = {
-    text = ''
-      ${lib.getExe' pkgs.alsa-utils "aplay"} /dev/urandom &
-      ${lib.getExe pkgs.cava}
-    '';
+    packages = [ pkgs.alsa-utils ];
+    text = "aplay /dev/urandom & cava";
     useTerminal = true;
   };
 

modules/cava/testbeds/cava.nix

@@ -1,10 +1,8 @@
 { lib, pkgs, ... }:
 {
   stylix.testbed.ui.command = {
-    text = ''
-      ${lib.getExe' pkgs.alsa-utils "aplay"} /dev/urandom &
-      ${lib.getExe pkgs.cava}
-    '';
+    packages = [ pkgs.alsa-utils ];
+    text = "aplay /dev/urandom & cava";
     useTerminal = true;
   };
 

modules/cavalier/testbeds/cavalier.nix

@@ -1,17 +1,8 @@
 { lib, pkgs, ... }:
-let
-  package = pkgs.cavalier;
-in
 {
-  stylix.testbed.ui.application = {
-    name = "org.nickvision.cavalier";
-    inherit package;
-  };
+  stylix.testbed.ui.command.text = pkgs.cavalier.meta.mainProgram;
 
   home-manager.sharedModules = lib.singleton {
-    programs.cavalier = {
-      enable = true;
-      inherit package;
-    };
+    programs.cavalier.enable = true;
   };
 }