element-desktop: add module (#6935)

modules/modules.nix

@@ -97,6 +97,7 @@ let
       ./programs/distrobox.nix
       ./programs/earthly.nix
       ./programs/eclipse.nix
+      ./programs/element-desktop.nix
       ./programs/emacs.nix
       ./programs/eww.nix
       ./programs/eza.nix

modules/programs/element-desktop.nix

@@ -0,0 +1,121 @@
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}:
+let
+  inherit (lib)
+    types
+    mkIf
+    mkEnableOption
+    mkPackageOption
+    mkOption
+    ;
+
+  cfg = config.programs.element-desktop;
+
+  formatter = pkgs.formats.json { };
+
+  prefix =
+    if pkgs.stdenv.hostPlatform.isDarwin then "Library/Application Support" else config.xdg.configHome;
+in
+{
+  meta.maintainers = with lib.hm.maintainers; [ aguirre-matteo ];
+
+  options.programs.element-desktop = {
+    enable = mkEnableOption "element-desktop";
+    package = mkPackageOption pkgs "element-desktop" { nullable = true; };
+    settings = mkOption {
+      type = formatter.type;
+      default = { };
+      example = ''
+        {
+          default_server_config = {
+            "m.homeserver" = {
+                base_url = "https://matrix-client.matrix.org";
+                server_name = "matrix.org";
+            };
+            "m.identity_server" = {
+                base_url = "https://vector.im";
+            };
+          };
+          disable_custom_urls = false;
+          disable_guests = false;
+          disable_login_language_selector = false;
+          disable_3pid_login = false;
+          force_verification = false;
+          brand = "Element";
+          integrations_ui_url = "https://scalar.vector.im/";
+          integrations_rest_url = "https://scalar.vector.im/api";
+        }
+      '';
+      description = ''
+        Configuration settings for Element's default profiles.
+        WARNING: Element doesn't combine this config with the defaults,
+        so make sure to configure most options. For details about this
+        behavior and available configuration options see:
+        <https://github.com/element-hq/element-web/blob/develop/docs/config.md>
+      '';
+    };
+    profiles = mkOption {
+      type = types.attrsOf formatter.type;
+      default = { };
+      example = ''
+        {
+          work = {
+            default_server_config = {
+              "m.homeserver" = {
+                  base_url = "https://matrix-client.matrix.org";
+                  server_name = "matrix.org";
+              };
+              "m.identity_server" = {
+                  base_url = "https://vector.im";
+              };
+            };
+          };
+          home = {
+            disable_custom_urls = false;
+            disable_guests = false;
+            disable_login_language_selector = false;
+            disable_3pid_login = false;
+          };
+          other = {
+            force_verification = false;
+            brand = "Element";
+            integrations_ui_url = "https://scalar.vector.im/";
+            integrations_rest_url = "https://scalar.vector.im/api";
+          };
+        }
+      '';
+      description = ''
+        Extra profiles for Element. Those can be accessed using the
+        "--profile $NAME" flag. The same warning and options apply
+        here.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = mkIf (cfg.package != null) [ cfg.package ];
+    home.file =
+      let
+        defaultConfig =
+          if (cfg.settings != { }) then
+            {
+              "${prefix}/Element/config.json".source = (
+                formatter.generate "element-desktop-default" cfg.settings
+              );
+            }
+          else
+            { };
+      in
+      defaultConfig
+      // (lib.mapAttrs' (
+        name: value:
+        lib.nameValuePair "${prefix}/Element-${name}/config.json" {
+          source = (formatter.generate "element-desktop-${name}" cfg.profiles."${name}");
+        }
+      ) cfg.profiles);
+  };
+}