zk: add module

modules/programs/zk.nix

@@ -0,0 +1,52 @@
+{ config, lib, pkgs, ... }:
+
+let
+
+  cfg = config.programs.zk;
+  tomlFormat = pkgs.formats.toml { };
+
+in {
+  meta.maintainers = [ lib.hm.maintainers.silmarp ];
+
+  options.programs.zk = {
+    enable = lib.mkEnableOption "zk";
+
+    package = lib.mkPackageOption pkgs "zk" { };
+
+    settings = lib.mkOption {
+      type = tomlFormat.type;
+      default = { };
+      example = lib.literalExpression ''
+        {
+          note = {
+            language = "en";
+            default-title = "Untitled";
+            filename = "{{id}}-{{slug title}}";
+            extension = "md";
+            template = "default.md";
+            id-charset = "alphanum";
+            id-length = 4;
+            id-case = "lower";
+          };
+          extra = {
+            author = "Mickaël";
+          };
+        }
+      '';
+      description = ''
+        Configuration written to {file}`$XDG_CONFIG_HOME/zk/config.toml`.
+
+        See <https://github.com/mickael-menu/zk/blob/main/docs/config.md> for
+        available options and documentation.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.packages = [ cfg.package ];
+
+    xdg.configFile."zk/config.toml" = lib.mkIf (cfg.settings != { }) {
+      source = tomlFormat.generate "config.toml" cfg.settings;
+    };
+  };
+}