Adjust GitHub Actions trigger

https://github.com/lycheeverse/lychee/issues/1157

.github/workflows/links.yml

@@ -0,0 +1,18 @@
+name: Links
+
+on:
+  push:
+    branches: master
+  pull_request:
+    branches: master
+  
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Link Checker
+        uses: lycheeverse/lychee-action@v1
+        with:
+          fail: true
+          args: --accept 403 './**/*.md'

.github/workflows/validate.yml

@@ -1,21 +0,0 @@
-name: Validate README
-
-on:
-  push:
-    branches: [master, main]
-  pull_request:
-    branches: [master, main]
-
-jobs:
-  validate:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Set up Go
-        uses: actions/setup-go@v5
-        with:
-          go-version: "1.21"
-
-      - name: Run validator
-        run: make -C gobooks validate

CONTRIBUTING.md

@@ -1,38 +1,18 @@
 Contribution Guidelines
 ====
 
-## Adding a book to the main list
+Add books with this format :
 
-Add books with this format:
 
 ```
 ### DATE - [BOOK NAME](BOOK URL)
 
-<img src="gobooks/covers/COVER_FILENAME" width="120px"/>
+<img src="BOOK COVER IMAGE ADDRESS" width="120px"/>
 
 BOOK DESCRIPTION
 
 ```
 
-* Place cover images in `gobooks/covers/` with a slug filename (e.g. `book-name.jpg`).
 * If book is free, add it after free books of that category and also add `*Free*` after book url.
 * Add other books in ascending date order (newest last). Books without date go at the end of the list in that category.
 * To keep track of the huge table of contents you can use a plugin like [Markdown VSCode plugin](https://marketplace.visualstudio.com/items?itemName=yzhang.markdown-all-in-one)
-
-## Adding a book in another language
-
-If a Go book exists in a language that already has a page (`gobooks/README-<lang>.md`), add it to that file using the same format as the main list. Write the book description in that language. Cover images go in `gobooks/covers/` as usual.
-
-## Adding a new language
-
-If no page exists yet for a language:
-
-1. Create `gobooks/README-<lang>.md` using the [ISO 639-1](https://en.wikipedia.org/wiki/List_of_ISO_639_language_codes) language code (e.g. `README-ja.md` for Japanese).
-2. Use the title **Go Books** translated into that language as the page heading (e.g. `# Go ブックス`).
-3. Write the introductory description in that language. Keep it simple: state that this is a complete list of Go books available in that language.
-4. List books using the same card format as the main README. All descriptions must be written in that language.
-5. For right-to-left languages (Arabic, Farsi, Hebrew, etc.), wrap the entire content in `<div dir="rtl"> ... </div>`.
-6. Add a link to the new page in the language bar at the top of `README.md`:
-   ```
-   **Other languages:** ... · [Language name in its own script](gobooks/README-<lang>.md)
-   ```

gobooks/.gitignore

@@ -1,23 +0,0 @@
-# Binaries
-validator/validator
-validator/validator.exe
-*.exe
-*.dll
-*.so
-*.dylib
-
-# Go
-*.test
-*.out
-go.work
-
-# IDE
-.idea/
-.vscode/
-*.swp
-*.swo
-*~
-
-# OS
-.DS_Store
-Thumbs.db

gobooks/Makefile

@@ -1,3 +0,0 @@
-.PHONY: validate
-validate:
-	cd validator && go run . ../../README.md

gobooks/README-de.md

@@ -1,78 +0,0 @@
-# Go-Bücher (Deutsch)
-
-[![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/sindresorhus/awesome)
-
-Dies ist eine vollständige Liste der **auf Deutsch verfügbaren Go-Bücher**, die offiziell in deutscher Sprache erschienen sind.
-
----
-
-### [Go programmieren für Dummies](https://www.wiley-vch.de/de/fachgebiete/informatik/go-programmieren-fuer-dummies-9783527714239)
-
-*Erscheinung*: **2022**  
-*Autor*: **Wei-Meng Lee**  
-*Verfügbar als*: **Druckausgabe**, **eBook**  
-*Sprache*: **Deutsch**
-
-Ein praxisorientiertes Einsteigerbuch, das Grundkonzepte der Programmiersprache Go erklärt und den Einstieg in die Go-Programmierung erleichtert.
-
------
-
-### [Programmiersprache „Go“ und Ökosysteme](https://www.thalia.de/shop/home/artikeldetails/A1062910674)
-
-*Erscheinung*: **2021**  
-*Autor*: **Christopher Peters**  
-*Verfügbar als*: **Taschenbuch**  
-*Sprache*: **Deutsch**
-
-Ein kurzes Buch über die Programmiersprache Go und ihr Ökosystem, das grundlegende Ideen und Anwendungsbereiche in deutscher Sprache vorstellt.
-
------
-
-### [Nichtsequentielle und Verteilte Programmierung mit Go](https://link.springer.com/book/10.1007/978-3-658-25369-9)
-
-*Erscheinung*: **2019**  
-*Autor*: **Christian Maurer**  
-*Verfügbar als*: **Druckausgabe**, **eBook**  
-*Sprache*: **Deutsch**
-
-Ein fortgeschritteneres Buch, das sich mit nebenläufiger und verteilter Programmierung mit Go befasst.
-
------
-
-### [Einstieg in Google Go](https://www.amazon.de/dp/3864900771)
-
-*Erscheinung*: **2012**  
-*Autoren*: **Christian Himpel**, **Mario Deilmann**  
-*Verfügbar als*: **eBook**  
-*Sprache*: **Deutsch**
-
-Ein älteres Einsteigerbuch zu Go, geeignet für Entwickler, die die Grundlagen der Sprache lernen möchten.
-
------
-
-### [Programmierung in Google Go](https://www.amazon.de/dp/3868020032)
-
-*Erscheinung*: **2010**  
-*Autoren*: **Rainer Feike**, **Steffen Blass**  
-*Verfügbar als*: **Druckausgabe (vergriffen)**  
-*Sprache*: **Deutsch**
-
-Ein älteres deutschsprachiges Go-Buch, das heute nur noch antiquarisch erhältlich ist.
-
------
-
-## Mitwirken
-
-Wenn du ein weiteres offiziell **auf Deutsch erschienenes Go-Buch kennst**, das hier fehlt, kannst du gerne eine Ergänzung vorschlagen.
-
-## Lizenz
-
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-<img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" />
-</a><br />
-Dieses Werk ist lizenziert unter einer  
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-Creative Commons Namensnennung 4.0 International Lizenz
-</a>.
-
-[← Zurück zur Hauptliste](https://github.com/dariubs/GoBooks)

gobooks/README-es.md

@@ -1,63 +0,0 @@
-# Libros de Go (en español)
-
-[![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/sindresorhus/GoBooks)
-
-Esta es una lista de libros sobre Go que se encuentran **disponibles en español**.
-
----
-
-### 📘 **Programación en Go** – *Mario Macías Lloret*
-
-*Última publicación*: **2021**  
-*Autor*: **Mario Macías Lloret**  
-*Disponible como*: **Impreso**, **eBook**  
-*Idioma*: **Español**
-
-Un libro orientado a principiantes y desarrolladores que quieren aprender Go desde cero, cubriendo desde conceptos básicos hasta temas intermedios de Go. :contentReference[oaicite:0]{index=0}
-
------
-
-### 📙 **Golang para Principiantes: Fundamentos** *(Spanish Edition)*
-
-*Última publicación*: **publicación reciente**  
-*Autor*: *(varios/autores autopublicados)*  
-*Disponible como*: **eBook**  
-*Idioma*: **Español**
-
-Libro pensado para quienes se inician en Go, con explicación de conceptos básicos de forma clara y sencilla. :contentReference[oaicite:1]{index=1}
-
------
-
-### 📗 **Desarrolla tu Carrera en Go: Programación en Golang** *(en español)*
-
-*Última publicación*: **publicación reciente**  
-*Autor*: **Francisco Alexander López Garrido**  
-*Disponible como*: **eBook**  
-*Idioma*: **Español**
-
-Guía completa para aprender Go desde la instalación hasta conceptos avanzados. :contentReference[oaicite:2]{index=2}
-
------
-
-## 📌 Notas importantes
-
-- Existen también recursos gratuitos y sin ISBN en español como *Aprende Go en Y minutos* o varios tutoriales en GitHub, pero **no son libros formales con ISBN**. :contentReference[oaicite:3]{index=3}  
-- Los títulos conocidos internacionalmente (como *The Go Programming Language*, *Learning Go*, *Head First Go*, etc.) **no están disponibles en español oficialmente** y se han eliminado de esta lista.
-
----
-
-## 👍 Contribuir
-
-Si conoces otro **libro publicado en español** sobre Go (con ISBN o editorial formal), puedes sugerirlo para añadirlo a esta lista.
-
-## 📜 Licencia
-
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-  <img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" />
-</a><br />
-Este trabajo está bajo una licencia  
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-Creative Commons Atribución 4.0 Internacional
-</a>.
-
-[← Volver a la lista principal](https://github.com/dariubs/GoBooks)

gobooks/README-fa.md

@@ -1,38 +0,0 @@
-<div dir="rtl">
-
-# کتاب‌های Go (فارسی)
-
-[![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/sindresorhus/awesome)
-
-این فهرست کاملی از کتاب‌های **منتشرشده به زبان فارسی** درباره Go است.
-
----
-
-### [زبان برنامه‌نویسی Go](https://book.gofarsi.ir/)
-
-*آخرین انتشار*: **۱۴۰۲**  
-*نویسنده*: **تاپیر لیو (Tapir Liu)**  
-*دسترسی رایگان*: **[مطالعه آنلاین](https://book.gofarsi.ir)**  
-*زبان*: **فارسی**
-
-اولین کتاب متن‌باز فارسی درباره زبان Go. در این کتاب، مباحث زبان Go از سطح مقدماتی تا پیشرفته پوشش داده شده است. این کتاب ترجمه و بومی‌سازی نسخه فارسی پروژه Go 101 محسوب می‌شود و یکی از جامع‌ترین منابع فارسی برای یادگیری عمیق Go به شمار می‌رود.
-
------
-
-## مشارکت
-
-اگر از انتشار یا ترجمه رسمی کتاب دیگری به زبان فارسی درباره Go اطلاع دارید، لطفاً پیشنهاد خود را ارسال کنید.
-
-## مجوز
-
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-  <img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" />
-</a><br />
-این اثر تحت مجوز 
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-Creative Commons Attribution 4.0 International
-</a> منتشر شده است.
-
-[← بازگشت به فهرست اصلی](https://github.com/dariubs/GoBooks)
-
-</div>

gobooks/README-pt.md

@@ -1,61 +0,0 @@
-# Livros de Go (em português)
-
-[![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/dariubs/GoBooks)
-
-Esta é uma lista completa dos **livros de Go publicados em português**.
-
----
-
-### 📘 **A Linguagem de Programação Go**
-
-*Última publicação*: **2017 (edição em português)**  
-*Autores*: **Alan A. A. Donovan** e **Brian W. Kernighan**  
-*Disponível como*: **Livro impresso**, **eBook**  
-*Idioma*: **Português (Brasil)**
-
-Uma tradução oficial do clássico “The Go Programming Language”, amplamente considerado o guia definitivo para aprender Go com profundidade e exemplos claros. :contentReference[oaicite:0]{index=0}
-
----
-
-### 📗 **Programando em Go: Crie aplicações com a linguagem do Google**
-
-*Última publicação*: **2014**  
-*Autor*: **Caio Filipini**  
-*Disponível como*: **Livro impresso**  
-*Idioma*: **Português (Brasil)**
-
-Cobre fundamentos da linguagem Go de forma prática, com foco em exemplos reais e aplicações completas. :contentReference[oaicite:1]{index=1}
-
----
-
-### 📙 **Introdução à Linguagem Go: Crie Programas Escaláveis e Confiáveis**
-
-*Última publicação*: **2016**  
-*Autor*: **Caleb Doxsey**  
-*Disponível como*: **Livro impresso / eBook**  
-*Idioma*: **Português (Brasil)**
-
-Uma introdução clara e acessível à linguagem Go, ideal para iniciantes que querem aprender a construir programas confiáveis e eficazes. :contentReference[oaicite:2]{index=2}
-
----
-
-## 📌 Observações
-
-✔️ Os livros originais em inglês como *Learning Go*, *Head First Go*, *Black Hat Go* etc. **não foram incluídos aqui**, pois **não têm edições oficiais em português**.  
-✔️ A listagem acima foca apenas em materiais *publicados em português* com ISBN ou editoras brasileiras conhecidas, como Novatec e Casa do Código. :contentReference[oaicite:3]{index=3}
-
----
-
-## Contribuir
-
-Se você conhecer **outro livro de Go publicado em português** (com ISBN ou distribuição comercial), por favor sugira para adicionarmos aqui.
-
-## Licença
-
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-  <img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" />
-</a><br />
-Este trabalho está licenciado sob uma  
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Atribuição 4.0 Internacional</a>.
-
-[← Voltar à lista principal](https://github.com/dariubs/GoBooks)

gobooks/README-ru.md

@@ -1,65 +0,0 @@
-# Книги по Go (на русском)
-
-[![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/dariubs/GoBooks)
-
-Это список книг по Go, которые **официально изданы на русском языке**.
-
----
-
-### 📗 **Язык программирования Go**
-
-*Последнее издание*: **2018 (русское издание)**  
-*Авторы*: **Alan A. A. Donovan** и **Brian W. Kernighan**  
-*Доступно в форматах*: **печать**, **электронная книга**  
-*Язык*: **русский**
-
-Русский перевод классического авторитетного руководства по Go — одной из лучших книг по языку вообще. Подходит как для новичков, так и для тех, кто хочет глубокого понимания языка. (Источник: магазины книг на русском)
-
----
-
-### 📘 **Go: расширенное руководство (Го: Полное руководство)**
-
-*Последнее издание*: **2021**  
-*Автор*: **Антон Поляк** (русский автор)  
-*Доступно как*: **печать**, **электронная книга**  
-*Язык*: **русский**
-
-Книга от российского автора с практическими примерами, построенная как полноценное руководство по Go — от основ до продвинутых тем.
-
----
-
-### 📙 **Go. Современное программирование**
-
-*Последнее издание*: **2019**  
-*Автор*: **Максим Петренко** (русский автор)  
-*Доступно как*: **печать**, **электронная книга**  
-*Язык*: **русский**
-
-Ещё одно руководство по Go на русском, охватывающее современные практики, инструментарии и примеры. Подходит как для новичков, так и для продолжающих.
-
----
-
-## 📌 Обратите внимание
-
-✔️ Многие известные книги по Go (например, *Learning Go*, *Head First Go*, *Black Hat Go*, *Go 101* и др.) **официально не переведены на русский**, поэтому **они исключены из этой версии списка**.  
-✔️ Включены **только книги с реальными русскими изданиями** (имеют русское название и ISBN).
-
----
-
-## 💡 Хотите помочь?
-
-Если вы знаете другие книги по Go с официальным русским изданием (ISBN/издательство), сообщите — я добавлю их в список.
-
----
-
-## 📜 Лицензия
-
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-  <img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" />
-</a><br />
-Это произведение лицензировано по  
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-Creative Commons Attribution 4.0 International
-</a>.
-
-[← Вернуться к основной Awesome-списку](https://github.com/dariubs/GoBooks)

gobooks/README-zh.md

@@ -1,133 +0,0 @@
-# Go 书籍（中文）
-
-[![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/dariubs/GoBooks)
-
-这是目前所有**正式出版或广泛存在的中文 Go 语言书籍**列表。
-
----
-
-### 📘 《Go 程序设计语言（中文版）》
-
-*中文出版时间*：**2017（译本）**  
-*原作者*：**Alan A. A. Donovan、Brian W. Kernighan**  
-*出版社*：机械工业出版社 / 清华大学出版社  
-*形式*：纸质书 / 电子书  
-*语言*：简体中文
-
-经典权威教材《The Go Programming Language》的中文译本，是学习 Go 语言的基石。:contentReference[oaicite:1]{index=1}
-
----
-
-### 📗 《Go 语言高级编程》
-
-*中文出版时间*：**2019**  
-*作者*：**柴树杉、曹春晖**  
-*出版社*：电子工业出版社  
-*语言*：简体中文
-
-进阶类型 Go 语言书籍，涵盖高阶主题如 CGO、反射、网络等内容。:contentReference[oaicite:2]{index=2}
-
----
-
-### 📘 《Go 语言并发编程实战》
-
-*中文出版时间*：**2015**  
-*作者*：**郝林**  
-*出版社*：人民邮电出版社  
-*语言*：简体中文
-
-专注于并发编程实践，适合对 goroutine、channel 并发深入学习。:contentReference[oaicite:3]{index=3}
-
----
-
-### 📙 《Go 学习笔记》
-
-*中文出版时间*：**2016 左右**  
-*作者*：**雨痕**  
-*形式*：纸质及电子版  
-*语言*：简体中文
-
-一本开发者个人总结风格的 Go 语言教程式笔记，广受社区推荐。:contentReference[oaicite:4]{index=4}
-
----
-
-### 📕 《Go Web 编程》
-
-*中文出版时间*：**2013**  
-*作者*：**谢孟军**  
-*出版社*：电子工业出版社  
-*语言*：简体中文
-
-聚焦 Web 应用与 HTTP 服务构建的 Go 语言书籍。:contentReference[oaicite:5]{index=5}
-
----
-
-### 📗 《Go 语言编程》
-
-*中文出版时间*：**2012**  
-*作者*：**许式伟 等**  
-*出版社*：人民邮电出版社  
-*语言*：简体中文
-
-较早的中文 Go 入门读物。:contentReference[oaicite:6]{index=6}
-
----
-
-### 📘 《Go 语言·云动力》 *(较早出版)*
-
-*中文出版时间*：**2012**  
-*作者*：**樊虹剑 (fango)**  
-*出版社*：电子工业出版社  
-*语言*：简体中文
-
-较早的 Go 中文入门书籍之一。:contentReference[oaicite:7]{index=7}
-
----
-
-### 📙 《Go 语言定制指南》
-
-*中文出版时间*：**2022**  
-*作者*：**柴树杉**  
-*形式*：纸质 / 电子  
-*语言*：简体中文
-
-围绕 Go 语法树与编译器相关主题的进阶指南。:contentReference[oaicite:8]{index=8}
-
----
-
-### 📒 **免费/开源在线资源**
-
-#### 📍 《Go 语言圣经（中文翻译开源版本）》
-
-*形式*：在线免费阅读  
-*基础*：中文翻译版《The Go Programming Language》供学习交流使用。:contentReference[oaicite:9]{index=9}
-
-#### 📍 《Go 101 中文版》
-
-*形式*：在线免费阅读  
-*内容*：深度讲解语法和运行时机制。:contentReference[oaicite:10]{index=10}
-
----
-
-## 📌 说明
-
-✔️ 本列表只保留了**已正式出版或有明确中文版本的 Go 图书**（含中文译本与中文原创书籍）。  
-✔️ 类似 *Learning Go*、*Head First Go*、*Black Hat Go* 等 **目前没有官方中文版**，因此本列表不包含它们。:contentReference[oaicite:11]{index=11}
-
----
-
-## 贡献
-
-如果你知道其他**正式出版的中文 Go 图书**（含 ISBN / 出版社），欢迎贡献补充内容！
-
-## 许可证
-
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-  <img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" />
-</a><br />
-本作品采用  
-<a rel="license" href="https://creativecommons.org/licenses/by/4.0/">
-Creative Commons Attribution 4.0 International
-</a> 授权。
-
-[← 返回主列表](https://github.com/dariubs/GoBooks)

gobooks/validator/go.mod

@@ -1,3 +0,0 @@
-module github.com/dariubs/gobooks/validator
-
-go 1.21

gobooks/validator/main.go

@@ -1,284 +0,0 @@
-// Validator for README.md structure in github.com/dariubs/gobooks.
-//
-// Checks: required sections, TOC link validity, no year prefixes in titles,
-// book metadata (*Last published*, *Authors*), cover images exist, covers linked.
-//
-// Usage: go run . [path/to/README.md]
-//        go run .              # uses README.md at repo root (../../README.md)
-package main
-
-import (
-	"fmt"
-	"os"
-	"path/filepath"
-	"regexp"
-	"strings"
-)
-
-func main() {
-	readmePath := filepath.Join("..", "..", "README.md")
-	if len(os.Args) > 1 {
-		readmePath = os.Args[1]
-	}
-
-	content, err := os.ReadFile(readmePath)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error reading file: %v\n", err)
-		os.Exit(1)
-	}
-
-	lines := strings.Split(string(content), "\n")
-	errors := []string{}
-	warnings := []string{}
-
-	// 1. Check main sections exist
-	requiredSections := []string{"Starter Books", "Advanced Books", "Web Development", "Resources"}
-	foundSections := extractSections(lines)
-	for _, sec := range requiredSections {
-		if !foundSections[sec] {
-			errors = append(errors, fmt.Sprintf("Missing required section: ## %s", sec))
-		}
-	}
-	// Contributing and License may use ## or ==== format
-	hasContributing := foundSections["Contributing"]
-	hasLicense := foundSections["License"]
-	for i, line := range lines {
-		if strings.TrimSpace(line) == "Contributing" && i+1 < len(lines) && strings.HasPrefix(lines[i+1], "====") {
-			hasContributing = true
-		}
-		if strings.TrimSpace(line) == "License" && i+1 < len(lines) && strings.HasPrefix(lines[i+1], "====") {
-			hasLicense = true
-		}
-	}
-	if !hasContributing {
-		errors = append(errors, "Missing required section: Contributing")
-	}
-	if !hasLicense {
-		errors = append(errors, "Missing required section: License")
-	}
-
-	// 2. Extract TOC links and section headers
-	tocLinks := extractTOCLinks(lines)
-	headers := extractHeaders(lines)
-	// Add Contributing/License anchors when using ==== format
-	if hasContributing {
-		headers["contributing"] = true
-	}
-	if hasLicense {
-		headers["license"] = true
-	}
-
-	// 3. Verify TOC links point to existing headers
-	for link, anchor := range tocLinks {
-		if !headers[anchor] {
-			errors = append(errors, fmt.Sprintf("TOC link points to non-existent anchor: [%s](#%s)", truncate(link, 50), anchor))
-		}
-	}
-
-	// 4. Check section headers have no year prefix (### 2020 - [Title] is wrong)
-	yearPrefix := regexp.MustCompile(`^###\s+\d{4}\s+-\s+`)
-	for i, line := range lines {
-		if yearPrefix.MatchString(line) {
-			errors = append(errors, fmt.Sprintf("Line %d: Book title should not have year prefix: %s", i+1, strings.TrimSpace(line)[:min(60, len(strings.TrimSpace(line)))]+"..."))
-		}
-	}
-
-	// 5. Check book entries have required metadata (*Last published* and *Authors*) - only in book sections
-	bookBlocks := extractBookBlocks(lines)
-	inResourceSection := false
-	for i, line := range lines {
-		if strings.TrimSpace(line) == "## Resources" {
-			inResourceSection = true
-			break
-		}
-		_ = i
-	}
-	resourceTitles := map[string]bool{"A tour of Go": true, "Video: Learn Go Syntax in one video": true, "Tutorials: Go by Example": true, "Go Fundamentals Video Training": true, "More Books on the Go Wiki": true, "TutorialEdge.net Course": true, "Coursera Specialization: Programming with Go": true, "Course: Understand Go's In-Depth Mechanics": true, "Course: Mastering Go Programming": true, "Course: Web Development with Google's Go Programming Language": true, "Golangbot.com Articles": true, "Tuxerrante repo on go exercises": true}
-	for title, block := range bookBlocks {
-		if resourceTitles[title] || inResourceSection && (strings.Contains(title, "tour") || strings.Contains(title, "Video") || strings.Contains(title, "Tutorial") || strings.Contains(title, "Course") || strings.Contains(title, "Articles") || strings.Contains(title, "Wiki")) {
-			continue
-		}
-		hasLastPublished := strings.Contains(block, "*Last published*")
-		hasAuthors := strings.Contains(block, "*Authors:*")
-		if !hasLastPublished {
-			warnings = append(warnings, fmt.Sprintf("Book '%s' missing *Last published*", truncate(title, 50)))
-		}
-		if !hasAuthors {
-			warnings = append(warnings, fmt.Sprintf("Book '%s' missing *Authors:*", truncate(title, 50)))
-		}
-	}
-
-	// 6. Check cover images exist
-	coverRefs := extractCoverRefs(lines)
-	for _, ref := range coverRefs {
-		if strings.HasPrefix(ref, "http") {
-			continue // external URL, skip
-		}
-		path := filepath.Join(filepath.Dir(readmePath), ref)
-		if _, err := os.Stat(path); os.IsNotExist(err) {
-			errors = append(errors, fmt.Sprintf("Cover image not found: %s", ref))
-		}
-	}
-
-	// 7. Check cover images are linked (wrapped in <a href>)
-	unlinkedCovers := findUnlinkedCovers(lines)
-	for _, img := range unlinkedCovers {
-		warnings = append(warnings, fmt.Sprintf("Cover image not linked to book: %s", img))
-	}
-
-	// Report
-	if len(errors) > 0 {
-		fmt.Println("❌ ERRORS:")
-		for _, e := range errors {
-			fmt.Println("  ", e)
-		}
-	}
-	if len(warnings) > 0 {
-		fmt.Println("\n⚠️  WARNINGS:")
-		for _, w := range warnings {
-			fmt.Println("  ", w)
-		}
-	}
-
-	if len(errors) > 0 {
-		os.Exit(1)
-	}
-	if len(warnings) > 0 {
-		fmt.Println("\n✓ Structure OK (with warnings)")
-	} else {
-		fmt.Println("\n✓ Structure OK")
-	}
-}
-
-func extractSections(lines []string) map[string]bool {
-	m := make(map[string]bool)
-	r := regexp.MustCompile(`^##\s+(.+)$`)
-	for _, line := range lines {
-		if match := r.FindStringSubmatch(line); match != nil {
-			m[strings.TrimSpace(match[1])] = true
-		}
-	}
-	return m
-}
-
-func extractHeaders(lines []string) map[string]bool {
-	m := make(map[string]bool)
-	r := regexp.MustCompile(`^#{1,6}\s+(.+)$`)
-	for _, line := range lines {
-		if match := r.FindStringSubmatch(line); match != nil {
-			text := strings.TrimSpace(match[1])
-			// Extract link text from [Title](url) or [Title](url) *Free*
-			linkMatch := regexp.MustCompile(`^\[([^\]]+)\][^\)]*\)`).FindStringSubmatch(text)
-			if linkMatch != nil {
-				text = linkMatch[1]
-			}
-			// Remove *Free* suffix
-			text = regexp.MustCompile(`\s*\*Free\*\s*$`).ReplaceAllString(text, "")
-			text = strings.TrimSpace(text)
-			anchor := toAnchor(text)
-			m[anchor] = true
-			// Add -free variant (TOC often uses this for free books even when header omits *Free*)
-			m[anchor+"-free"] = true
-		}
-	}
-	return m
-}
-
-func toAnchor(s string) string {
-	s = strings.ToLower(s)
-	s = regexp.MustCompile(`[^a-z0-9\s-]`).ReplaceAllString(s, "")
-	s = regexp.MustCompile(`\s+`).ReplaceAllString(s, "-")
-	return strings.Trim(s, "-")
-}
-
-func extractTOCLinks(lines []string) map[string]string {
-	m := make(map[string]string)
-	r := regexp.MustCompile(`^\s*-\s+\[([^\]]+)\]\(#([^\)]+)\)`)
-	for _, line := range lines {
-		if match := r.FindStringSubmatch(line); match != nil {
-			title := strings.TrimSpace(match[1])
-			anchor := strings.TrimSpace(match[2])
-			m[title] = anchor
-		}
-	}
-	return m
-}
-
-func extractBookBlocks(lines []string) map[string]string {
-	m := make(map[string]string)
-	bookR := regexp.MustCompile(`^###\s+\[([^\]]+)\].*$`)
-	var currentTitle string
-	var currentBlock strings.Builder
-
-	for _, line := range lines {
-		if match := bookR.FindStringSubmatch(line); match != nil {
-			if currentTitle != "" {
-				m[currentTitle] = currentBlock.String()
-			}
-			currentTitle = match[1]
-			currentBlock.Reset()
-			currentBlock.WriteString(line)
-			currentBlock.WriteString("\n")
-		} else if currentTitle != "" && (strings.HasPrefix(line, "###") || strings.HasPrefix(line, "##")) {
-			m[currentTitle] = currentBlock.String()
-			currentTitle = ""
-			currentBlock.Reset()
-		} else if currentTitle != "" && line != "-----" {
-			currentBlock.WriteString(line)
-			currentBlock.WriteString("\n")
-		}
-	}
-	if currentTitle != "" {
-		m[currentTitle] = currentBlock.String()
-	}
-	return m
-}
-
-func extractCoverRefs(lines []string) []string {
-	var refs []string
-	r := regexp.MustCompile(`src="(gobooks/covers/[^"]+)"`)
-	for _, line := range lines {
-		if match := r.FindStringSubmatch(line); match != nil {
-			refs = append(refs, match[1])
-		}
-	}
-	// Also check gobooks/cover/ path (typo)
-	r2 := regexp.MustCompile(`src="(gobooks/cover/[^"]+)"`)
-	for _, line := range lines {
-		if match := r2.FindStringSubmatch(line); match != nil {
-			refs = append(refs, match[1])
-		}
-	}
-	return refs
-}
-
-func findUnlinkedCovers(lines []string) []string {
-	var unlinked []string
-	r := regexp.MustCompile(`<img\s+src="(gobooks/covers/[^"]+)"`)
-	for _, line := range lines {
-		// Skip if img is inside <a href> or markdown link [<img...>](url)
-		if (strings.Contains(line, "<a href=") || strings.Contains(line, "](http")) && strings.Contains(line, "<img") {
-			continue
-		}
-		if match := r.FindStringSubmatch(line); match != nil {
-			unlinked = append(unlinked, match[1])
-		}
-	}
-	return unlinked
-}
-
-func truncate(s string, max int) string {
-	s = strings.Split(s, "(")[0]
-	s = strings.TrimSpace(s)
-	if len(s) > max {
-		return s[:max] + "..."
-	}
-	return s
-}
-
-func min(a, b int) int {
-	if a < b {
-		return a
-	}
-	return b
-}