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main.go
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main.go
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package main
import (
"fmt"
"net/http"
"os"
"golang.org/x/net/html"
)
var depth int
func main() {
for _, url := range os.Args[1:] {
_ = outline(url)
}
}
func outline(url string) error {
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
doc, err := html.Parse(resp.Body)
if err != nil {
return err
}
forEachNode(doc, startElement, endElement)
return nil
}
func forEachNode(n *html.Node, pre, post func(n *html.Node)) {
if pre != nil {
pre(n)
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
forEachNode(c, pre, post)
}
if post != nil {
post(n)
}
}
func startElement(n *html.Node) {
if n.Type == html.ElementNode {
fmt.Printf("%*s<%s>\n", depth*2, "", n.Data)
depth++
}
}
func endElement(n *html.Node) {
if n.Type == html.ElementNode {
depth--
fmt.Printf("%*s</%s>\n", depth*2, "", n.Data)
}
}