I forgot many things of golang

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{Makefile,*.mk,go.mod,go.sum,*.go,.gitmodules,*.sh}]
+indent_style = tab
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+  - package-ecosystem: 'gomod'
+    directory: '/'
+    schedule:
+      interval: 'weekly'

.github/workflows/actionlint.yml

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+name: Lint GitHub Actions workflows
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '.github/**'
+  pull_request:
+    paths:
+      - '.github/**'
+
+jobs:
+  actionlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Download actionlint
+        id: get_actionlint
+        run: bash <(curl https://raw.githubusercontent.com/rhysd/actionlint/main/scripts/download-actionlint.bash)
+        shell: bash
+      - name: Check workflow files
+        run: ${{ steps.get_actionlint.outputs.executable }} -color -shellcheck=
+        shell: bash

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  go:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version-file: 'go.mod'
+          cache-dependency-path: 'go.sum'
+      - name: Build
+        run: go build -v

.gitignore

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+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+# Binary
+nix-headbump

.vscode/settings.json

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+{
+  "cSpell.words": [
+    "nixpkgs"
+  ]
+}

LICENSE

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+MIT License
+
+Copyright (c) 2023 Kenichi Kamiya
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# nix-headbump
+
+For my personal use.
+
+I'm a new to the Nix ecosystem.
+(If you know a better way, please let me know!)
+
+I have `default.nix` and `shell.nix` in many repositories. They have different nixpath(?) in the ref from the created timing.
+Personally, I use the latest [nixpkgs](https://github.com/NixOS/nixpkgs) ref.
+When I want to bump it, I always visit the nixpkgs repository and copy and paste. It is a tedious task.
+
+## NOTE
+
+* I guess there are many other syntax patterns in Nix files that I have not used. This code will not care about them.
+* I don't know [nix-community/go-nix](https://github.com/nix-community/go-nix) will fit or not.
+* I don't know if Nix provides this feature with the CLI or not.

default.nix

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+{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/e57b65abbbf7a2d5786acc86fdf56cde060ed026.tar.gz") { } }:
+
+pkgs.mkShell {
+  buildInputs = [
+    pkgs.nil
+    pkgs.nixpkgs-fmt
+    pkgs.dprint
+    pkgs.actionlint
+  ];
+}

go.mod

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+module nix-headbump
+
+go 1.20

nix-headbump.go

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+package main
+
+import (
+	"encoding/json"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"regexp"
+)
+
+func main() {
+	path := "default.nix"
+	isNixFileExist := true
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		path = "shell.nix"
+		if _, err := os.Stat(path); os.IsNotExist(err) {
+			isNixFileExist = false
+		}
+	}
+
+	if isNixFileExist {
+		err := bump(path)
+		if err != nil {
+			log.Fatalf("Bumping the version has been failed: %s", err.Error())
+		}
+	} else {
+		log.Fatalln("Both default.nix and shell.nix are not found")
+	}
+}
+
+type Commit struct {
+	Sha string `json:"sha"`
+}
+
+type Response struct {
+	Commit Commit `json:"commit"`
+}
+
+func bump(path string) error {
+	bytes, err := os.ReadFile(path)
+	if err != nil {
+		return err
+	}
+	re := regexp.MustCompile(`(import \(fetchTarball "https://github.com/NixOS/nixpkgs/archive/)(?:[^"]+?)(\.tar\.gz"\))`)
+	req, _ := http.NewRequest("GET", "https://api.github.com/repos/NixOS/nixpkgs/branches/master", nil)
+	req.Header.Set("Accept", "application/vnd.github+json")
+	req.Header.Set("X-GitHub-Api-Version", "2022-11-28")
+	client := new(http.Client)
+	res, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+	body, err := io.ReadAll(res.Body)
+	if err != nil {
+		return err
+	}
+	jsonRes := &Response{}
+	if json.Unmarshal(body, jsonRes) != nil {
+		return err
+	}
+	replaced := re.ReplaceAll(bytes, []byte("${1}"+jsonRes.Commit.Sha+"${2}"))
+	return os.WriteFile(path, replaced, os.ModePerm)
+}