Flakify xmonad

.envrc

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+use flake

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1670242877,
+        "narHash": "sha256-jBLh7dRHnbfvPPA9znOC6oQfKrCPJ0El8Zoe0BqnCjQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "6e51c97f1c849efdfd4f3b78a4870e6aa2da4198",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Build my xmonad config";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils }:
+
+    flake-utils.lib.eachDefaultSystem (system:
+      let pkgs = nixpkgs.legacyPackages.${system}; in
+      {
+        devShells.default = import ./shell.nix { inherit pkgs; };
+      }) // {
+    packages.x86_64-linux.default =
+      # Notice the reference to nixpkgs here.
+      with import nixpkgs { system = "x86_64-linux"; };
+      haskellPackages.callCabal2nix "xmonad-config" ./. {};
+  };
+}

shell.nix

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+{ pkgs }:
+let
+  inherit (pkgs) callPackage fetchFromGitHub mkShell;
+  easy-hls-src = fetchFromGitHub {
+    owner  = "jkachmar";
+    repo   = "easy-hls-nix";
+    rev    = "291cf77f512a7121bb6801cde35ee1e8b7287f91";
+    sha256 = "1bvbcp9zwmh53sm16ycp8phhc6vzc72a71sf0bvyjgfbn6zp68bc";
+  };
+  easy-hls = callPackage easy-hls-src {};
+in
+
+mkShell {
+  buildInputs = [ easy-hls ];
+}