feat: conversor de páginas web a markdown

Implementa ToMarkdown() para convertir HTML a Markdown usando Turndown.js inline.

Incluye:
- Soporte para títulos, enlaces, imágenes, listas, tablas
- Opciones para incluir/excluir imágenes y enlaces
- Selector CSS opcional para convertir secciones específicas
- Comando CLI to_markdown.go para uso directo

Archivo: pkg/browser/markdown.go, cmd/to_markdown.go

cmd/to_markdown.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"navegator/pkg/browser"
+)
+
+func main() {
+	urlFlag := flag.String("url", "", "URL to convert to markdown")
+	selectorFlag := flag.String("selector", "", "CSS selector to convert (optional)")
+	outputFlag := flag.String("output", "", "Output file (default: stdout)")
+	noImages := flag.Bool("no-images", false, "Exclude images")
+	noLinks := flag.Bool("no-links", false, "Convert links to plain text")
+	flag.Parse()
+
+	if *urlFlag == "" {
+		log.Fatal("Usage: to_markdown -url <url> [-selector <css>] [-output <file>] [-no-images] [-no-links]")
+	}
+
+	ctx := context.Background()
+
+	// Configurar navegador
+	config := browser.DefaultConfig()
+	config.ProfileName = "markdown-converter"
+	config.StealthFlags.Headless = true
+
+	// Lanzar navegador
+	log.Println("Launching browser...")
+	b, err := browser.Launch(ctx, config)
+	if err != nil {
+		log.Fatalf("Error launching browser: %v", err)
+	}
+	defer b.Close()
+
+	// Navegar a URL
+	log.Printf("Navigating to %s...\n", *urlFlag)
+	opts := browser.DefaultNavigateOptions()
+	opts.WaitUntil = "networkidle"
+
+	if err := b.Navigate(ctx, *urlFlag, opts); err != nil {
+		log.Printf("Warning: navigation error: %v\n", err)
+	}
+
+	// Configurar opciones de markdown
+	mdOpts := browser.DefaultMarkdownOptions()
+	mdOpts.Selector = *selectorFlag
+	mdOpts.IncludeImages = !*noImages
+	mdOpts.IncludeLinks = !*noLinks
+
+	// Convertir a markdown
+	log.Println("Converting to markdown...")
+	markdown, err := b.ToMarkdown(ctx, mdOpts)
+	if err != nil {
+		log.Fatalf("Error converting to markdown: %v", err)
+	}
+
+	// Output
+	if *outputFlag != "" {
+		if err := os.WriteFile(*outputFlag, []byte(markdown), 0644); err != nil {
+			log.Fatalf("Error writing to file: %v", err)
+		}
+		log.Printf("Markdown saved to %s\n", *outputFlag)
+	} else {
+		fmt.Println("\n=== MARKDOWN OUTPUT ===\n")
+		fmt.Println(markdown)
+	}
+}