Extract links from a webpage

import std/httpclient
import std/xmltree
import std/strtabs

import pkg/htmlparser    # 3rd-party library


proc get_page(url: string): string =
  let client = newHttpClient()
  try:
    client.getContent(url)
  except HttpRequestError as e:
    stderr.writeLine("Error: ", e.msg)
    ""

proc extractLinks(html: string): seq[string] =
  try:
    let doc = parseHtml(html)
    for a in doc.findAll("a"):
      if "href" in a.attrs:
        result.add(a.attrs["href"])
  except Exception as e:
    echo "Error: " & e.msg

proc main() =
  let
    url = "https://arato.inf.unideb.hu/szathmary.laszlo/pmwiki/index.php?n=Acad.Nim2"
    html = get_page(url)
    links = extractLinks(html)

  for link in links:
    echo link

# ##########

when isMainModule:
  main()