templates: Add a flake template

default.nix

@@ -5,7 +5,11 @@ buildGoApplication {
   pname = "gomod2nix";
   version = "0.1";
   src = lib.cleanSourceWith {
-    filter = name: type: (! lib.hasSuffix "tests" name) && (! lib.hasSuffix "builder" name);
+    filter = name: type: builtins.foldl' (v: s: v && ! lib.hasSuffix s name) true [
+      "tests"
+      "builder"
+      "templates"
+    ];
     src = lib.cleanSource ./.;
   };
   modules = ./gomod2nix.toml;

flake.nix

@@ -8,6 +8,15 @@
   outputs = { self, nixpkgs, utils }:
     {
       overlays.default = import ./overlay.nix;
+
+      templates = {
+        app = {
+          path = ./templates/app;
+          description = "Gomod2nix packaged application";
+        };
+      };
+      defaultTemplate = self.templates.app;
+
     } //
     (utils.lib.eachDefaultSystem
       (system:

templates/app/.gitignore

@@ -0,0 +1 @@
+/gomod2nix-template

templates/app/default.nix

@@ -0,0 +1,10 @@
+{ buildGoApplication, go, lib }:
+
+buildGoApplication {
+  inherit go;
+  pname = "myapp";
+  version = "0.1";
+  src = ./.;
+  modules = ./gomod2nix.toml;
+  subPackages = [ "." ];
+}

templates/app/flake.nix

@@ -0,0 +1,23 @@
+{
+  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:tweag/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; };
+        })
+    );
+}

templates/app/go.mod

@@ -0,0 +1,3 @@
+module example.com/gomod2nix-template
+
+go 1.17

templates/app/gomod2nix.toml

@@ -0,0 +1,3 @@
+schema = 1
+
+[mod]

templates/app/main.go

@@ -0,0 +1,9 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	fmt.Println("Hello flake")
+}

templates/app/shell.nix

@@ -0,0 +1,8 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+pkgs.mkShell {
+  packages = [
+    pkgs.go
+    pkgs.gomod2nix
+  ];
+}