add fennel-ls to shell derivation

I'm unsure whether it's actually useful or not, haven't tried it yet

pkgs/maps/default.nix

@@ -84,4 +84,9 @@ in stdenv.mkDerivation {
       icon = "nix-snowflake"; # "${placeholder "out"}/share/icons/${pname}.svg";
     })
   ];
+
+  passthru = {
+    inherit lua luaPackages;
+  };
+
 }

pkgs/maps/shell.nix

@@ -1,8 +1,27 @@
 with import <nixpkgs> {};
-let package = pkgs.callPackage ./. {};
+let
+  package = pkgs.callPackage ./. {};
+  fennel-ls1 =
+    let inherit (pkgs) stdenv pandoc;
+    in stdenv.mkDerivation {
+      name = "fennel-ls";
+      buildInputs = [ package.lua ];
+      nativeBuildInputs = [ pandoc ];
+      makeFlags = [ "PREFIX=\\$out" ];
+      src = fetchFromSourcehut {
+        owner ="~xerool";
+        repo ="fennel-ls";
+        rev = "552b03b983c18d7db5053350711bef9088cc9110";
+        hash = "sha256-npR10hzPYgDPbKWB5ueq8cXAWYvUEbVVJ1R/EEdCnVY=";
+      };
+    };
+  fennel-ls = pkgs.fennel-ls.override { inherit (package) lua luaPackages; };
 in
 package.overrideAttrs(o: {
+  nativeBuildInputs = [ fennel-ls ] ++ o.nativeBuildInputs;
   shellHook = ''
+    mkdir -p bin
+    ( cd bin && ln -sf `type -p fennel-ls` `type -p fennel` . )
     export LUA_CPATH=$(lua -e "print(package.cpath)")
     export LUA_PATH=$(lua -e "print(package.path)")\;$RXI_JSON/share/lua/5.3/?.lua
   '';