Change kernel to be accept a list of kernels

List of kernel paths are formatted into JUPYTER_PATH environment
variable

jupyter.nix

@@ -1,20 +1,25 @@
 {
-  pkgs,
+  mkShellNoCC,
-  kernel,
+  python3,
-  python ? pkgs.python3,
+  kernels ? [],
+  extraPackages ? (ps: []),
 }:
-pkgs.mkShellNoCC {
+mkShellNoCC {
   nativeBuildInputs = [
-    (python.withPackages (ps:
+    (python3.withPackages (ps:
-      with ps; [
+      with ps;
-        jupyterlab
+        [
-        jupyterlab-git
+          jupyterlab
-        nbdime
+          jupyterlab-git
-        nbconvert
+          nbdime
-        (ps.callPackage ./catppuccin_jupyterlab {})
+          nbconvert
-      ]))
+          python-lsp-server
+          (ps.callPackage ./catppuccin_jupyterlab {})
+        ]
+        ++ (extraPackages ps)))
   ];
-  shellHook = ''
+  shellHook = with builtins; let
-    export JUPYTER_PATH=${kernel}
+    kernelString = foldl' (x: y: ":" + (toString y) + x) "" kernels;
-  '';
+    pathString = substring 1 (stringLength kernelString) kernelString;
+  in "export JUPYTER_PATH=${pathString}";
 }