chore: add flake.nix

default.nix

+{ pkgs ? (
+    let
+      inherit (builtins) fetchTree fromJSON readFile;
+      inherit ((fromJSON (readFile ./flake.lock)).nodes) nixpkgs gomod2nix;
+    in
+    import (fetchTree nixpkgs.locked) {
+      overlays = [
+        (import "${fetchTree gomod2nix.locked}/overlay.nix")
+      ];
+    }
+  )
+}:
+
+pkgs.buildGoApplication {
+  pname = "myapp";
+  version = "0.1";
+  pwd = ./.;
+  src = ./.;
+  modules = ./gomod2nix.toml;
+}

flake.lock

+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1692799911,
+        "narHash": "sha256-3eihraek4qL744EvQXsK1Ha6C3CR7nnT8X2qWap4RNk=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "f9e7cf818399d17d347f847525c5a5a8032e4e44",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gomod2nix": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      },
+      "locked": {
+        "lastModified": 1677459247,
+        "narHash": "sha256-JbakfAiPYmCCV224yAMq/XO0udN5coWv/oazblMKdoY=",
+        "owner": "nix-community",
+        "repo": "gomod2nix",
+        "rev": "3cbf3a51fe32e2f57af4c52744e7228bab22983d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "gomod2nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1658285632,
+        "narHash": "sha256-zRS5S/hoeDGUbO+L95wXG9vJNwsSYcl93XiD0HQBXLk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5342fc6fb59d0595d26883c3cadff16ce58e44f3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "master",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1693663421,
+        "narHash": "sha256-ImMIlWE/idjcZAfxKK8sQA7A1Gi/O58u5/CJA+mxvl8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e56990880811a451abd32515698c712788be5720",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "gomod2nix": "gomod2nix",
+        "nixpkgs": "nixpkgs_2"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "locked": {
+        "lastModified": 1653893745,
+        "narHash": "sha256-0jntwV3Z8//YwuOjzhV2sgJJPt+HY6KhU7VZUL0fKZQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ed9fb1935d260de5fe1c2f7ee0ebaae17ed2fa1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

+{
+  description = "A basic gomod2nix flake";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.gomod2nix.url = "github:nix-community/gomod2nix";
+
+  outputs = { self, nixpkgs, flake-utils, gomod2nix }:
+    (flake-utils.lib.eachDefaultSystem
+      (system:
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [ gomod2nix.overlays.default ];
+          };
+
+        in
+        {
+          packages.default = pkgs.callPackage ./. { };
+          devShells.default = import ./shell.nix { inherit pkgs; };
+        })
+    );
+}

gomod2nix.toml

+schema = 1
+
+[mod]

main.go

+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	fmt.Println("Hello flake")
+}

shell.nix

+{ pkgs ? (
+    let
+      inherit (builtins) fetchTree fromJSON readFile;
+      inherit ((fromJSON (readFile ./flake.lock)).nodes) nixpkgs gomod2nix;
+    in
+    import (fetchTree nixpkgs.locked) {
+      overlays = [
+        (import "${fetchTree gomod2nix.locked}/overlay.nix")
+      ];
+    }
+  )
+}:
+
+let
+  goEnv = pkgs.mkGoEnv { pwd = ./.; };
+in
+pkgs.mkShell {
+  packages = [
+    goEnv
+    pkgs.gomod2nix
+  ];
+}