hacker-news: Initial checkin.

diff --git a/extra/hacker-news/authors.txt b/extra/hacker-news/authors.txt
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+++ b/extra/hacker-news/authors.txt
@@ -0,0 +1 @@
+Doug Coleman

diff --git a/extra/hacker-news/hacker-news.factor b/extra/hacker-news/hacker-news.factor
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+++ b/extra/hacker-news/hacker-news.factor
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+! Copyright (C) 2012 Doug Coleman.
+! See http://factorcode.org/license.txt for BSD license.
+USING: accessors assocs classes.tuple colors.constants
+colors.hex combinators formatting fry http.client io io.styles
+json.reader kernel make math sequences splitting urls ;
+IN: hacker-news
+
+TUPLE: post title postedBy points id url commentCount postedAgo ;
+
+: items> ( seq -- seq' )
+    [ \ post from-slots ] map ;
+
+: hacker-news-items ( -- seq )
+    "http://api.ihackernews.com/page" http-get nip
+    json> "items" swap at items> ;
+
+: write-title ( title url -- )
+    '[
+        _ presented ,,
+        COLOR: black foreground ,,
+    ] H{ } make format ;
+
+: write-link ( title url -- )
+    '[
+        _ presented ,,
+        HEXCOLOR: 888888 foreground ,,
+    ] H{ } make format ;
+
+: write-text ( str -- )
+    H{ { foreground HEXCOLOR: 888888 } } format ;
+
+: post>user-url ( post -- user-url )
+    postedBy>> "http://news.ycombinator.com/user?id=" prepend >url ;
+
+: post>comments-url ( post -- user-url )
+    id>> "http://news.ycombinator.com/item?id=%d" sprintf >url ;
+
+
+: post. ( post index -- )
+    "%2d. " sprintf write-text {
+        [ [ title>> ] [ url>> ] bi write-title ]
+        [ url>> >url host>> " (" ")" surround write-text nl ]
+        [ points>> "    %d points" sprintf write-text ]
+        [ " by " write-text [ postedBy>> ] [ post>user-url ] bi write-link ]
+        [ " " write-text postedAgo>> write-text ]
+        [
+            "|" write-text
+            [ commentCount>> "%d comments" sprintf ]
+            [ post>comments-url ] bi write-link nl nl
+        ]
+    } cleave ;
+
+: banner. ( -- )
+    "Hacker News"
+    H{
+        { font-size 20 }
+        { font-style bold }
+        { background HEXCOLOR: ff6600 }
+    } format nl ;
+
+: hacker-news. ( -- )
+    hacker-news-items banner.
+    [ 1 + post. ] each-index ;