add flake

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -0,0 +1,3 @@
+.direnv
+*.bak
+result

flake.lock

@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1674868155,
+        "narHash": "sha256-eFNm2h6fNbgD7ZpO4MHikCB5pSnCJ7DTmwPisjetmwc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ce20e9ebe1903ea2ba1ab006ec63093020c761cb",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-22.11",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,40 @@
+{
+  description = "po: pushover notification tool";
+
+  inputs.nixpkgs.url = "nixpkgs/nixos-22.11";
+
+  outputs = { self, nixpkgs }:
+    let
+      supportedSystems =
+        [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
+    in {
+      packages = forAllSystems (system:
+        let pkgs = nixpkgsFor.${system};
+        in {
+          po = pkgs.buildGoModule {
+            pname = "po";
+            version = "v0.0.0";
+            src = ./.;
+
+            vendorSha256 = "sha256-5XxgYk1zkH9Txsb/A4s/zUdBKRaOzAHOxD58cqEV4ck=";
+            proxyVendor = true;
+          };
+        });
+
+      defaultPackage = forAllSystems (system: self.packages.${system}.po);
+      devShells = forAllSystems (system:
+        let pkgs = nixpkgsFor.${system};
+        in {
+          default = pkgs.mkShell {
+            shellHook = ''
+              PS1='\u@\h:\@; '
+              echo "Go `${pkgs.go}/bin/go version`"
+            '';
+            nativeBuildInputs = with pkgs; [ git go gopls go-tools ];
+          };
+        });
+    };
+}
+