flake_input@{ kpcli-py, nixgl, rust-overlay, neovim-nightly-overlay, ... }: [

  nixgl.overlays.default

  rust-overlay.overlays.default

  neovim-nightly-overlay.overlay

  (final: prev: 
  let 
    nightlyRustWithExts = exts: final.rust-bin.selectLatestNightlyWith (
      toolchain: toolchain.minimal.override.extensions = exts;
    );
    # https://rust-lang.github.io/rustup/concepts/profiles.html
    rust-default-components = ["rust-docs" "rustfmt" "clippy"];
    rust-dev-components = rust-default-components ++ ["rust-src" "rust-analyzer" "miri"];
  in
  {
    # use python3.9, which works because of cython somehow?
    kpcli-py = final.poetry2nix.mkPoetryApplication {
      projectDir = kpcli-py;
      python = final.python39;
      overrides = final.poetry2nix.defaultPoetryOverrides.extend (self: super: {
        # tableformatter requires setuptools
        tableformatter = super.tableformatter.overridePythonAttrs (
          old: {
            buildInputs = (old.buildInputs or [ ]) ++ [ super.setuptools super.cython_3 ];
          }
        );
      });
    };
    
    rust4devs = nightlyRustWithExts rust-dev-components;
    rust4cargo = nightlyRustWithExts [];
    rust4normi = nightlyRustWIthExts rust-default-components;
  })

]