Allow the creation of location pins

default.nix

@@ -1,5 +1,9 @@
 { pkgs, lib, config, ... }:
 {
+  imports = [
+    ./marker.nix
+  ];
+
   options = {
     scripts = {
       output = lib.mkOption {

marker.nix

@@ -0,0 +1,37 @@
+{ lib, config, ... }:
+let
+  markerType = lib.types.submodule {
+    options = {
+      location = lib.mkOption {
+        type = lib.types.nullOr lib.types.str;
+        default = null;
+      };
+    };
+  };
+in
+{
+  options = {
+    map.markers = lib.mkOption {
+      type = lib.types.listOf markerType;
+    };
+  };
+
+  config = {
+    map = {
+      markers = [
+        { location = "Switzerland"; }
+        { location = "New York"; }
+      ];
+    };
+
+    requestParams =
+      let
+        paramsForMarkers = builtins.map
+          (marker: "$(${config.scripts.geocode}/bin/geocode ${
+            lib.escapeShellArg marker.location})")
+          config.map.markers;
+      in [
+        "markers=\"${lib.concatStringsSep "|" paramsForMarkers}\""
+      ];
+  };
+}