[Golang] Hacker News Link to reStructuredText
Extract title and URL from Hacker News comment via goquery, and then output the info to reStructuredText footnote.
Install Go and goquery package first. Then go run the following code:
package main
import (
"bytes"
"github.com/PuerkitoBio/goquery"
"html/template"
"net/http"
)
type HNews struct {
Title string
URL string
CommentsURL string
}
type Index struct {
Textarea template.HTML
}
var htmlTmpl = `<!doctype html><html>
<head><title>Link to Rst Image</title></head>
<body>
<form action="/" method="post">
<input size="100" name="url" placeholder="HN comments URL">
<button>Send</button><br><br>
<textarea id="ta" rows="5" cols="80">{{.Textarea}}</textarea><br>
<button type="button" id="copy">Copy textarea to clipboard</button>
</form>
<script>
var textareaElm = document.getElementById("ta");
var copyElm = document.getElementById("copy");
copyElm.onclick = function(event) {
textareaElm.select();
var isSuccessful = document.execCommand('copy');
if (isSuccessful) {
textareaElm.value = "Copy OK";
} else {
textareaElm.value = "Copy Fail";
}
}
</script>
</body></html>`
var rstTmpl = ".. [1] `{{.Title}} <{{.URL}}>`_\n" +
" (`HN comments <{{.CommentsURL}}>`__)\n"
func processHNURL(url string) string {
doc, err := goquery.NewDocument(url)
if err != nil {
panic(err)
}
news := HNews{CommentsURL: url}
newsElm := doc.Find("td.title > a")
news.Title = newsElm.Text()
news.URL, _ = newsElm.Attr("href")
tmpl, err := template.New("hn").Parse(rstTmpl)
if err != nil {
panic(err)
}
var rst bytes.Buffer
err = tmpl.Execute(&rst, news)
if err != nil {
panic(err)
}
return rst.String()
}
func handler(w http.ResponseWriter, r *http.Request) {
idx := Index{}
if r.Method == "POST" {
hnurl := r.PostFormValue("url")
idx.Textarea = template.HTML(processHNURL(hnurl))
}
tmpl, err := template.New("index").Parse(htmlTmpl)
if err != nil {
panic(err)
}
tmpl.Execute(w, idx)
}
func main() {
http.HandleFunc("/", handler)
http.ListenAndServe(":8000", nil)
}
Tested on: Ubuntu Linux 15.10, Go 1.6.
References:
| [2] | golang backtick - Google search golang backtick - DuckDuckGo search golang backtick - Yahoo search |