scrape builder docs from https://www.packer.io/docs/

in order to get what is required and what is not.

.gitignore

@@ -26,3 +26,4 @@ packer-test*.log
 Thumbs.db
 /packer.exe
 .project
+cache

cmd/doc-required-scraper/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/gocolly/colly"
+)
+
+const (
+	DocsUrl  = "https://www.packer.io/docs/"
+	CacheDir = "cache/"
+)
+
+func main() {
+	c := colly.NewCollector()
+
+	// Find and visit all doc pages
+	c.OnHTML("a[href]", func(e *colly.HTMLElement) {
+		url := e.Attr("href")
+		if !strings.HasPrefix(url, "/docs/builders") {
+			return
+		}
+		e.Request.Visit(url)
+	})
+
+	c.OnHTML("#required- + ul a[name]", func(e *colly.HTMLElement) {
+
+		builder := e.Request.URL.Path[strings.Index(e.Request.URL.Path, "/builders/")+len("/builders/"):]
+		builder = strings.TrimSuffix(builder, ".html")
+
+		text := e.DOM.Parent().Text()
+		text = strings.ReplaceAll(text, "\n", "")
+		text = strings.TrimSpace(text)
+
+		fmt.Printf("required: %25s builder: %20s text: %s\n", e.Attr("name"), builder, text)
+	})
+
+	c.CacheDir = CacheDir
+
+	c.Visit(DocsUrl)
+}