Refactor Nix flake inputs

flake.nix

@@ -12,19 +12,11 @@
     hs-bindgen.url = "github:well-typed/hs-bindgen/release-0.1-alpha";
   };
   outputs =
-    { self
-    , nixpkgs
-    , flake-utils
-    , haskellNix
-    , hls-2-13
-    , crane
-    , rust-overlay
-    , hs-bindgen
-    }:
-    flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
+    inputs@{ nixpkgs, ... }:
+    inputs.flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
     let
       overlays = [
-        haskellNix.overlay
+        inputs.haskellNix.overlay
         (final: _prev: {
           hixProject =
             final.haskell-nix.hix.project {
@@ -35,18 +27,18 @@
               shell.tools.cabal = "latest";
               shell.withHoogle = false;
               shell.tools.haskell-language-server = {
-                src = hls-2-13;
+                src = inputs.hls-2-13;
                 sha256map = {
                   "https://github.com/snowleopard/alga"."d4e43fb42db05413459fb2df493361d5a666588a" = "0s1mlnl64wj7pkg3iipv5bb4syy3bhxwqzqv93zqlvkyfn64015i";
                 };
               };
             };
         })
-        (import rust-overlay)
+        (import inputs.rust-overlay)
       ];
-      pkgs = import nixpkgs { inherit system overlays; inherit (haskellNix) config; };
+      pkgs = import nixpkgs { inherit system overlays; inherit (inputs.haskellNix) config; };
       haskell = pkgs.hixProject.flake { };
-      rust = (crane.mkLib pkgs).overrideToolchain (p: p.rust-bin.selectLatestNightlyWith (
+      rust = (inputs.crane.mkLib pkgs).overrideToolchain (p: p.rust-bin.selectLatestNightlyWith (
         toolchain: toolchain.default.override {
           extensions = [ "rust-src" ];
           targets = [ "x86_64-unknown-linux-gnu" ];
@@ -62,7 +54,7 @@
         packages = with pkgs; [
           bacon
           ghcid
-          hs-bindgen.packages.${system}.hs-bindgen-cli
+          inputs.hs-bindgen.packages.${system}.hs-bindgen-cli
           rust-analyzer
           rust-cbindgen
         ];