Add flake;

.envrc

@@ -1,2 +1,6 @@
-export GOPATH=$PWD
-export PATH=$GOPATH/bin:$PATH
+strict_env
+
+if has nix
+then
+   use flake
+fi

.github/workflows/nix_adapt_hashes.yaml

@@ -0,0 +1,61 @@
+name: Adapt Nix hashes
+on:
+  workflow_dispatch: {} # 🚧 To-do: Remove this debug code.
+  pull_request:
+    branches:
+      - main
+    paths:
+      - ".github/workflows/nix_adapt_hashes.yaml"
+      - "go.mod"
+      - "go.sum"
+  push:
+    branches:
+      - main
+    paths:
+      - ".github/workflows/nix_adapt_hashes.yaml"
+      - "go.mod"
+      - "go.sum"
+
+concurrency:
+  group: "${{ github.workflow }}/${{ github.ref }}"
+  cancel-in-progress: true
+
+jobs:
+  check-tidy-go-mod:
+    name: Adapt the hashes in Nix-package-definitions.
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          # With push token that can trigger new PR jobs.
+          token: ${{ secrets.APP_AUTOSCALER_CI_TOKEN }}
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v26
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install nix-update
+        run: nix profile install 'nixpkgs/nixos-unstable#nix-update'
+
+      - name: Run nix-update
+        shell: bash
+        run: |
+          #! /usr/bin/env bash
+          set -eu -o pipefail
+
+          nix-update 'app-autoscaler-cli-plugin' --flake
+
+          declare -i -r num_changed_files="$(git status --porcelain | wc --lines)"
+          if ((num_changed_files > 0))
+          then
+            echo 'Changes to some files were necessary!'
+            declare -r tidy_message='🤖🦾🛠️ Update Nix-package-hashes'
+            git add .
+            git commit --message="${tidy_message}"
+            git push
+          else
+            echo 'No hash-changes necessary!'
+          fi
+          echo '🏁'

.gitignore

@@ -1,6 +1,7 @@
-/out/
-/pkg/
-/bin/
+# Editor-configurations
 .idea
-build
+
+# ❄ Nix build-results
+/result
+/result-*
 

NOTICE

@@ -4,5 +4,5 @@ This project is licensed to you under the Apache License, Version 2.0 (the "Lice
 You may not use this project except in compliance with the License.
 
 This project may include a number of subcomponents with separate copyright notices
-and license terms. Your use of these subcomponents is subject to the terms and 
+and license terms. Your use of these subcomponents is subject to the terms and
 conditions of the subcomponent's license, as noted in the LICENSE file.

flake.nix

@@ -0,0 +1,62 @@
+{
+  description = ''
+    Flake for the cf-cli-plugin for app-autoscaler
+
+    For more on app-autoscaler, see: <https://github.com/cloudfoundry/app-autoscaler-release>
+  '';
+
+  inputs = {
+    nixpkgs.url = github:NixOS/nixpkgs/nixos-23.11;
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    let
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
+    in flake-utils.lib.eachSystem supportedSystems (system: {
+      packages = {
+        app-autoscaler-cli-plugin = nixpkgsFor.${system}.buildGoModule rec {
+          pname = "app-autoscaler-cli-plugin";
+          version =
+            let
+              lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
+            in "${builtins.substring 0 8 lastModifiedDate}-dev";
+          src = ./.;
+
+          # 🔨🚧 To-do: Create automation to get that updated if necessary per pull-request.
+          # As long as this automation does not exist, it needs to be updated manually.
+          vendorHash = "sha256-NzEStcOv8ZQsHOA8abLABKy+ZE3/SiYbRD/ZVxo0CEk=";
+
+          doCheck = false;
+
+          meta = {
+            description = ''
+              App-AutoScaler plug-in provides the command line interface to manage
+              [App AutoScaler](<https://github.com/cloudfoundry/app-autoscaler-release>)
+              policies, retrieve metrics and scaling event history.
+            '';
+            homepage = "https://github.com/cloudfoundry/app-autoscaler-cli-plugin";
+            license = [nixpkgs.lib.licenses.apsl20];
+          };
+        };
+      };
+
+      devShells =
+        let
+          nixpkgs = nixpkgsFor.${system};
+        in {
+          default = nixpkgs.mkShell {
+            buildInputs = with nixpkgs; [
+              delve
+              go
+              gopls
+            ];
+          };
+        };
+    });
+}

scripts/build

@@ -1,7 +1,7 @@
-#!/bin/bash
+#! /usr/bin/env bash
 
 set -e
 
-ROOT_DIR=$(cd $(dirname $(dirname $0)) && pwd)
+ROOT_DIR="$(cd $(dirname $(dirname $0)) && pwd)"
 
-go build -o $ROOT_DIR/out/ascli cli 
+go build -o "${ROOT_DIR}/out/ascli/cli"