[pg]

This was all the code it took:

  (newsop pending () (pending-page user))

  (newscache pending-page user 60
    (listpage user (msec) comments* [if (and (cansee user _) _!pending) _]
              "pending" "Pending Comments" "pending" nil))

In this project I've really benefited from having kept the code tight.

[couchand → pg]

Forgive me for asking what's probably a simple question: what's HN coded in? That's pretty clearly a flavor of Lisp... what's the square bracket predicate syntax?

[nokcha → couchand]

It's written in Arc.

Regarding the square bracket syntax:

    [... _ ...]  is an abbreviation for (fn (_) (... _ ...))

http://www.paulgraham.com/arc.html

http://en.wikipedia.org/wiki/Arc_%28programming_language%29

[rbanffy → couchand]

IIRC, it's written in Arc

http://arclanguage.org

[jrlocke → couchand]

Arc

[elwell]

The second comment refers to a small portion of the first comment's reference.