yambar: add module

modules/programs/yambar.nix

@@ -0,0 +1,55 @@
+{ config, lib, pkgs, ... }:
+
+let
+
+  cfg = config.programs.yambar;
+  yamlFormat = pkgs.formats.yaml { };
+
+in {
+  meta.maintainers = [ lib.maintainers.carpinchomug ];
+
+  options.programs.yambar = {
+    enable = lib.mkEnableOption "Yambar";
+
+    package = lib.mkPackageOption pkgs "yambar" { };
+
+    settings = lib.mkOption {
+      type = yamlFormat.type;
+      default = { };
+      example = lib.literalExpression ''
+        bar = {
+          location = "top";
+          height = 26;
+          background = "00000066";
+
+          right = [
+            {
+              clock.content = [
+                {
+                  string.text = "{time}";
+                }
+              ];
+            }
+          ];
+        };
+      '';
+      description = ''
+        Configuration written to {file}`$XDG_CONFIG_HOME/yambar/config.yml`.
+        See {manpage}`yambar(5)` for options.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "programs.yambar" pkgs
+        lib.platforms.linux)
+    ];
+
+    home.packages = [ cfg.package ];
+
+    xdg.configFile."yambar/config.yml" = lib.mkIf (cfg.settings != { }) {
+      source = yamlFormat.generate "config.yml" cfg.settings;
+    };
+  };
+}