Initial checkin

flake.nix

@@ -0,0 +1,9 @@
+{
+  description = "Nix-to-EDN converter.";
+
+  input = { nixpkgs.url = "nixpkgs/nixos-21.05"; };
+
+  outputs = { self, nixpkgs }: {
+    lib = { toEDN = import ./to-edn.nix { inherit (nixpkgs) lib; }; };
+  };
+}

to-edn.nix

@@ -0,0 +1,21 @@
+{ lib }:
+
+with lib;
+let
+  join-str = concatStringsSep " ";
+  toEDN = ds:
+    if isString ds then
+      ''"${ds}"''
+    else
+      (if isInt ds then
+        ds
+      else
+        (if isList ds then
+          "[ ${join-str (map toEDN ds)} ]"
+        else
+          (if isAttrs ds then
+            "{ ${join-str (mapAttrs (k: v: ":${k} ${toEDN v}") ds)} }"
+          else
+            throw "unsupported type: ${builtins.typeOf ds}: ${ds}")));
+
+in { ds }: toEDN ds