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!7

sclass WikiResult {
  S rawPage, firstPart;
  
  S firstSentence() {
    L<S> lines = toLines(firstPart);
    ret get(lines, indexOfNotStartingWith(lines, "[["));
  }
}

WikiResult > Redirect {
  S toWord;
}

p {
  testWord("fun");
  testWord("recreation");
}

svoid testWord(S word) {
  print("= " + word + " =");
  WikiResult result = querySimpleWikipedia(word);
  print(result.rawPage);
  print();
  if (result >> Redirect)
    print("Redirect to: " + quote(result/Redirect.toWord));
  else
    print("First sentence:\n" + indent(dropContainerTags(result.firstSentence())));
  print();
}

static WikiResult querySimpleWikipedia(S word) {
  S raw = loadPageSilently("https://simple.wikipedia.org/wiki/" + urlencode(word) + "?action=raw"), rawPage = raw;
  
  // check for redirect
  S p = "#REDIRECT [[";
  if (startsWith(raw, p) && endsWith(raw, "]]"))
    ret nu(Redirect, +rawPage,
      toWord := dropPrefix(p, dropSuffix("]]", raw)));
      
  L<S> lines = toLines(raw);
  int n = smartIndexOfStartsWith(lines, "==");
  S firstPart = joinLines(subList(lines, 0, n));
  print("First part:\n" + indent(firstPart));
      
  ret nu(WikiResult, +rawPage, +firstPart);
}