khard: add module

modules/programs/khard.nix

@@ -0,0 +1,88 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.programs.khard;
+
+  accounts =
+    lib.filterAttrs (_: acc: acc.khard.enable) config.accounts.contact.accounts;
+
+  renderSettings = with lib.generators;
+    toINI {
+      mkKeyValue = mkKeyValueDefault rec {
+        mkValueString = v:
+          if lib.isList v then
+            lib.concatStringsSep ", " v
+          else if lib.isBool v then
+            if v then "yes" else "no"
+          else
+            v;
+      } "=";
+    };
+in {
+  meta.maintainers =
+    [ lib.hm.maintainers.olmokramer lib.maintainers.antonmosich ];
+
+  options = {
+    programs.khard = {
+      enable = lib.mkEnableOption "Khard: an address book for the Unix console";
+
+      settings = lib.mkOption {
+        type = with lib.types;
+          submodule {
+            freeformType = let primOrList = oneOf [ bool str (listOf str) ];
+            in attrsOf (attrsOf primOrList);
+
+            options.general.default_action = lib.mkOption {
+              type = str;
+              default = "list";
+              description = "The default action to execute.";
+            };
+          };
+        default = { };
+        description = ''
+          Khard settings. See
+          <https://khard.readthedocs.io/en/latest/#configuration>
+          for more information.
+        '';
+        example = lib.literalExpression ''
+          {
+            general = {
+              default_action = "list";
+              editor = ["vim" "-i" "NONE"];
+            };
+
+            "contact table" = {
+              display = "formatted_name";
+              preferred_phone_number_type = ["pref" "cell" "home"];
+              preferred_email_address_type = ["pref" "work" "home"];
+            };
+
+            vcard = {
+              private_objects = ["Jabber" "Skype" "Twitter"];
+            };
+          }
+        '';
+      };
+    };
+
+    accounts.contact.accounts = lib.mkOption {
+      type = with lib.types;
+        attrsOf (submodule {
+          options.khard.enable = lib.mkEnableOption "khard access";
+        });
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.packages = [ pkgs.khard ];
+
+    xdg.configFile."khard/khard.conf".text = ''
+      [addressbooks]
+      ${lib.concatMapStringsSep "\n" (acc: ''
+        [[${acc.name}]]
+        path = ${acc.local.path}
+      '') (lib.attrValues accounts)}
+
+      ${renderSettings cfg.settings}
+    '';
+  };
+}