read default config from file

nixos-module.nix

@@ -3,52 +3,6 @@
 let
   yammat = import ./. { inherit pkgs; };
   cfg = config.services.yammat;
-  defaultConfig = ''
-    # Values formatted like "_env:ENV_VAR_NAME:default_value" can be overridden by the specified environment variable.
-    # See https://github.com/yesodweb/yesod/wiki/Configuration#overriding-configuration-values-with-environment-variables
-
-    static-dir:     "_env:STATIC_DIR:static"
-    host:           "_env:HOST:*4" # any IPv4 host
-    port:           "_env:PORT:3000"
-    approot:        "_env:APPROOT:http://localhost:3000"
-    ip-from-header: "_env:IP_FROM_HEADER:false"
-
-    # Optional values with the following production defaults.
-    # In development, they default to the inverse.
-    #
-    # development: false
-    # detailed-logging: false
-    # should-log-all: false
-    # reload-templates: false
-    # mutable-static: false
-    # skip-combining: false
-
-    database:
-      user:     "_env:PGUSER:yammat"
-      password: "_env:PGPASS:yammat"
-      host:     "_env:PGHOST:localhost"
-      port:     "_env:PGPORT:5432"
-      database: "_env:PGDATABASE:yammat"
-      poolsize: "_env:PGPOOLSIZE:10"
-
-    email:
-    - "nek0@momen"
-    currency: "€"
-    cash_charge: 50
-
-    copyright: "Powered by YAMMAT"
-    copyright_link: "https://github.com/nek0/yammat"
-
-    block_users: false
-
-    sendmail-location: "/usr/sbin/sendmail"
-    from-mail: "matemat@matemat.hq.c3d2.de"
-
-    # optional administrative credentials.
-    # credentials:
-    #   login: "admin"
-    #   password: "password"
-  '';
 in
 {
   options.services.yammat = with lib; {
@@ -67,9 +21,7 @@ in
 
     config = mkOption {
       type = types.lines
-      example = ''
+      default = builtins.readFile ./config/settings.yml;
-        ${defaultConfig}
-      '';
       description = "Configuration for Yammat";
     };
   };