hwatch: add module (#7158)

modules/programs/hwatch.nix

@@ -0,0 +1,50 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  inherit (lib)
+    mkIf
+    mkOption
+    types
+    ;
+  cfg = config.programs.hwatch;
+in
+{
+  meta.maintainers = with lib.hm.maintainers; [
+    Aehmlo
+  ];
+
+  options.programs.hwatch = {
+    enable = lib.mkEnableOption ''
+      hwatch, a modern alternative to the {command}`watch` command
+    '';
+
+    package = lib.mkPackageOption pkgs "hwatch" { nullable = true; };
+
+    extraArgs = mkOption {
+      type = types.listOf types.str;
+      default = [ ];
+      example = [
+        "--exec"
+        "--precise"
+      ];
+      description = ''
+        Extra command-line arguments to pass to {command}`hwatch`.
+        These will be used to populate the {env}`HWATCH` environment variable.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = mkIf (cfg.package != null) [ cfg.package ];
+
+    home.sessionVariables = mkIf (cfg.extraArgs != [ ]) {
+      HWATCH = lib.concatMapStringsSep " " lib.escapeShellArg cfg.extraArgs;
+    };
+  };
+
+}