nixos/speechd: add settings (#380361)

nixos/modules/services/accessibility/speechd.nix

@@ -7,9 +7,11 @@
 let
   cfg = config.services.speechd;
   inherit (lib)
+    mapAttrs'
     mkEnableOption
     mkIf
     mkPackageOption
+    mkOption
     ;
 in
 {
@@ -17,13 +19,72 @@ in
     # FIXME: figure out how to deprecate this EXTREMELY CAREFULLY
     # default guessed conservatively in ../misc/graphical-desktop.nix
     enable = mkEnableOption "speech-dispatcher speech synthesizer daemon";
+
     package = mkPackageOption pkgs "speechd" { };
+
+    config = mkOption {
+      type = with lib.types; nullOr lines;
+      default = null;
+      description = ''
+        System wide configuration file for Speech Dispatcher. This will be used if no user configuration file is found.
+      '';
+      example = ''
+        AddModule "module_name" "module_binary" "module_config"
+      '';
+    };
+
+    modules = mkOption {
+      type = with lib.types; submodule { freeformType = attrsOf lines; };
+      default = { };
+      description = ''
+        Configuration files of output modules.
+      '';
+      example = {
+        generic-epos = ''
+          AddVoice        "cs"  "male1"   "kadlec"
+          AddVoice        "sk"  "male1"   "bob"
+        '';
+      };
+    };
+
+    clients = mkOption {
+      type = with lib.types; submodule { freeformType = attrsOf lines; };
+      default = { };
+      description = ''
+        Client specific configuration.
+      '';
+      example = {
+        emacs = ''
+          BeginClient "emacs:*"
+          # Example:
+          #   DefaultPunctuationMode "some"
+          EndClient
+        '';
+      };
+    };
   };
 
   config = mkIf cfg.enable {
     environment = {
       systemPackages = [ cfg.package ];
+
+      etc =
+        if cfg.config == null then
+          { speech-dispatcher.source = "${cfg.package}/etc/speech-dispatcher"; }
+        else
+          {
+            "speech-dispatcher/speechd.conf".text = cfg.config;
+          }
+          // (mapAttrs' (name: value: {
+            name = "speech-dispatcher/modules/${name}.conf";
+            value.text = value;
+          }) cfg.modules)
+          // (mapAttrs' (name: value: {
+            name = "speech-dispatcher/clients/${name}.conf";
+            value.text = value;
+          }) cfg.clients);
     };
+
     systemd.packages = [ cfg.package ];
     # have to set `wantedBy` since `systemd.packages` ignores `[Install]`
     systemd.user.sockets.speech-dispatcher.wantedBy = [ "sockets.target" ];