From 172aed43dc6731c56427a2a5dd135428cd0d2659 Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Sat, 5 Oct 2024 14:02:53 +0900
Subject: [PATCH 1/3] feat: Add go

---
 flake.nix      |  4 ++++
 go/flake.nix   | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++
 go/treefmt.nix | 20 ++++++++++++++++
 3 files changed, 86 insertions(+)
 create mode 100644 go/flake.nix
 create mode 100644 go/treefmt.nix

diff --git a/flake.nix b/flake.nix
index 4d2cb97..027fece 100644
--- a/flake.nix
+++ b/flake.nix
@@ -29,6 +29,10 @@
           path = ./node-typescript;
           description = "Toolchain for TypeScript frontend projects";
         };
+        go = {
+          path = ./go;
+          description = "A minimal environment for Go with support for Go module";
+        };
         ocaml = {
           path = ./ocaml;
           description = "A flake template for development with OPAM and Dune";
diff --git a/go/flake.nix b/go/flake.nix
new file mode 100644
index 0000000..eea868d
--- /dev/null
+++ b/go/flake.nix
@@ -0,0 +1,62 @@
+{
+  inputs = {
+    # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    systems.url = "github:nix-systems/default";
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  # Configure a binary cache for your executable(s).
+  nixConfig = {
+    extra-substituters =
+      [
+      ];
+    extra-trusted-public-keys =
+      [
+      ];
+  };
+
+  outputs =
+    {
+      self,
+      systems,
+      nixpkgs,
+      treefmt-nix,
+      ...
+    }:
+    let
+      inherit (nixpkgs) lib;
+      eachSystem = f: lib.genAttrs (import systems) (system: f nixpkgs.legacyPackages.${system});
+
+      treefmtEval = eachSystem (pkgs: treefmt-nix.lib.evalModule pkgs ./treefmt.nix);
+    in
+    {
+      # Build executables. See https://nixos.org/manual/nixpkgs/stable/#sec-language-go
+      packages = eachSystem (pkgs: {
+        # default = pkgs.buildGoModule {
+        #   pname = "squasher";
+        #   version = builtins.substring 0 8 (self.lastModifiedDate or "19700101");
+        #   src = self.outPath;
+        #   vendorHash = lib.fakeHash;
+        #   meta = { };
+        # };
+      });
+
+      devShells = eachSystem (pkgs: {
+        default = pkgs.mkShell {
+          packages = [
+            pkgs.go
+            pkgs.gopls
+          ];
+        };
+      });
+
+      formatter = eachSystem (pkgs: treefmtEval.${pkgs.system}.config.build.wrapper);
+
+      checks = eachSystem (pkgs: {
+        formatting = treefmtEval.${pkgs.system}.config.build.check self;
+      });
+    };
+}
diff --git a/go/treefmt.nix b/go/treefmt.nix
new file mode 100644
index 0000000..6d84570
--- /dev/null
+++ b/go/treefmt.nix
@@ -0,0 +1,20 @@
+{
+  projectRootFile = "treefmt.nix";
+
+  # See https://github.com/numtide/treefmt-nix#supported-programs
+
+  programs.gofmt.enable = true;
+
+  # JSON
+  programs.biome.enable = true;
+
+  # GitHub Actions
+  programs.yamlfmt.enable = true;
+  programs.actionlint.enable = true;
+
+  # Markdown
+  programs.mdformat.enable = true;
+
+  # Nix
+  programs.nixfmt.enable = true;
+}

From d9b7acfc0a7884c66707afe506064ce351d80c4a Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Sat, 5 Oct 2024 14:04:32 +0900
Subject: [PATCH 2/3] ci(go): Init

---
 .github/workflows/check-go.yml | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 .github/workflows/check-go.yml

diff --git a/.github/workflows/check-go.yml b/.github/workflows/check-go.yml
new file mode 100644
index 0000000..0a0e60f
--- /dev/null
+++ b/.github/workflows/check-go.yml
@@ -0,0 +1,33 @@
+name: Check go
+on:
+  push:
+    paths:
+      # Set this to the directory of the template
+      - go/**
+      - .github/workflows/check-go.yml
+  workflow_dispatch:
+  workflow_call:
+concurrency:
+  group: check-go-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: cachix/install-nix-action@v30
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+            flake-registry =  https://raw.githubusercontent.com/akirak/flake-pins/master/registry.json
+      - uses: cachix/cachix-action@v15
+        with:
+          name: akirak
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+          pushFilter: '-source$'
+      - uses: actions/checkout@v4
+        with:
+          path: ./tmp
+      - name: Use the template
+        run: |
+          nix flake new -t ./tmp#go work
+      - run: go version

From 54d2ead83027e8457f3353305340b2ac3b0c9ac7 Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Sat, 5 Oct 2024 14:09:35 +0900
Subject: [PATCH 3/3] docs(readme): Update on adding Go

---
 README.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/README.md b/README.md
index 5cd4857..fa952c3 100644
--- a/README.md
+++ b/README.md
@@ -172,6 +172,18 @@ This flake provides minimal dependencies for [Gleam](https://gleam.run/).
 nix flake init -t github:akirak/flake-templates#gleam
 ```
 
+### [go](go/)
+
+This flake provides a development environment for [Go](https://go.dev/).
+
+``` bash
+nix flake init -t github:akirak/flake-templates#go
+```
+
+Note that creating a Go project may require some manual work. This template
+helps you start working on an existing Go project on NixOS or adding a Nix-based
+CI, but not much more.
+
 ### [meta](meta/)
 
 This is a set of common metadata files for GitHub projects, such as