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package main
import (
"fmt"
"net/http"
"os"
"strings"
"golang.org/x/net/html"
)
var (
tickers map[string]string
)
func init() {
tickers = map[string]string{}
}
func MapFrom(attrs []html.Attribute) map[string]string {
m := map[string]string{}
for _, attr := range attrs {
m[attr.Key] = attr.Val
}
return m
}
func Visit(n *html.Node) {
if n.Type == html.ElementNode && n.Data == "fin-streamer" {
m := MapFrom(n.Attr)
if m["data-field"] != "" && strings.Contains(m["data-field"], "Price") {
tickers[m["data-symbol"]] = m["value"]
}
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
Visit(c)
}
}
func main() {
if len(os.Args) != 2 {
fmt.Printf("Usage:\n\t%s <symbol>\n", os.Args[0])
return
}
ticker := strings.ToUpper(os.Args[1])
response, _ := http.Get(fmt.Sprintf("https://finance.yahoo.com/quote/%s/", ticker))
doc, _ := html.Parse(response.Body)
Visit(doc)
fmt.Printf("%v\n", tickers[ticker])
}
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