feat(generator): add Mustache

lib/lib.nix

@@ -100,6 +100,19 @@
       } ''
         python ${renderScript} > $out
       '';
+
+    mustache = {
+      name,
+      opts,
+      data,
+    }: let
+      inherit (opts) template;
+      mustache = opts.mustache or pkgs.mustache-go;
+      dataJson = writeText "template-data.json" (builtins.toJSON data);
+    in
+      runCommand name {
+        buildInputs = [mustache];
+      } "mustache ${dataJson} ${template} > $out";
   };
 
   buildAllFiles = files:

lib/module.nix

@@ -30,7 +30,7 @@ in {
           };
 
           generator = mkOption {
-            type = types.enum ["nix" "string" "derivation" "gotmpl" "jinja" "template"];
+            type = types.enum ["nix" "string" "derivation" "gotmpl" "jinja" "mustache" "template"];
             description = ''
               Which engine to use for content generation.
             '';