reddit: adding a Reddit API wrapper.

diff --git a/extra/reddit/authors.txt b/extra/reddit/authors.txt
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+++ b/extra/reddit/authors.txt
@@ -0,0 +1 @@
+John Benediktsson

diff --git a/extra/reddit/reddit.factor b/extra/reddit/reddit.factor
new file mode 100644 (file)
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+++ b/extra/reddit/reddit.factor
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+! Copyright (C) 2011-2012 John Benediktsson
+! See http://factorcode.org/license.txt for BSD license
+
+USING: accessors assocs calendar classes.tuple combinators
+formatting http.client json json.reader kernel make math
+math.statistics sequences urls ;
+
+IN: reddit
+
+<PRIVATE
+
+TUPLE: comment approved_by author author_flair_css_class
+author_flair_text banned_by body body_html created created_utc
+downs id levenshtein likes link_id link_title name num_reports
+parent_id replies edited subreddit subreddit_id ups ;
+
+TUPLE: user comment_karma created created_utc has_mail
+has_mod_mail id is_gold is_mod link_karma name ;
+
+TUPLE: story author author_flair_css_class author_flair_text
+approved_by banned_by clicked created created_utc domain downs
+hidden id is_self levenshtein likes link_flair_css_class
+link_flair_text media media_embed name edited num_comments
+num_reports over_18 permalink saved score selftext selftext_html
+subreddit subreddit_id thumbnail title ups url ;
+
+TUPLE: subreddit created created_utc description display_name id
+name over18 subscribers title url ;
+
+: parse-data ( assoc -- obj )
+    [ "data" swap at ] [ "kind" swap at ] bi {
+        { "t1" [ comment ] }
+        { "t2" [ user ] }
+        { "t3" [ story ] }
+        { "t5" [ subreddit ] }
+        [ throw ]
+    } case from-slots ;
+
+TUPLE: page url data before after ;
+
+: json-page ( url -- page )
+    >url dup http-get nip json> "data" swap at {
+        [ "children" swap at [ parse-data ] map ]
+        [ "before" swap at [ f ] when-json-null ]
+        [ "after" swap at [ f ] when-json-null ]
+    } cleave \ page boa ;
+
+: (user) ( username -- data )
+    "http://api.reddit.com/user/%s" sprintf json-page ;
+
+: (about) ( username -- data )
+    "http://api.reddit.com/user/%s/about" sprintf
+    http-get nip json> parse-data ;
+
+: (subreddit) ( subreddit -- data )
+    "http://api.reddit.com/r/%s" sprintf json-page ;
+
+: (url) ( url -- data )
+    "http://api.reddit.com/api/info?url=%s" sprintf json-page ;
+
+: (search) ( query -- data )
+    "http://api.reddit.com/search?q=%s" sprintf json-page ;
+
+: (subreddits) ( query -- data )
+    "http://api.reddit.com/reddits/search?q=%s" sprintf json-page ;
+
+: (domains) ( query -- data )
+    "http://api.reddit.com/domain/%s" sprintf json-page ;
+
+: next-page ( page -- page' )
+    [ url>> ] [ after>> "after" set-query-param ] bi json-page ;
+
+: all-pages ( page -- data )
+    [
+        [ [ data>> , ] [ dup after>> ] bi ]
+        [ next-page ] while drop
+    ] { } make concat ;
+
+PRIVATE>
+
+: user-links ( username -- stories )
+    (user) data>> [ story? ] filter [ url>> ] map ;
+
+: user-comments ( username -- comments )
+    (user) data>> [ comment? ] filter [ body>> ] map ;
+
+: user-karma ( username -- karma )
+    (about) link_karma>> ;
+
+: url-score ( url -- score )
+    (url) data>> [ score>> ] map-sum ;
+
+: subreddit-links ( subreddit -- links )
+    (subreddit) data>> [ url>> ] map ;
+
+: subreddit-top ( subreddit -- )
+    (subreddit) data>> [
+        1 + "%2d. " printf {
+            [ title>> ]
+            [ url>> ]
+            [ score>> ]
+            [ num_comments>> ]
+            [
+                created_utc>> unix-time>timestamp now swap time-
+                duration>hours "%d hours ago" sprintf
+            ]
+            [ author>> ]
+        } cleave
+        "%s\n    %s\n    %d points, %d comments, posted %s by %s\n\n"
+        printf
+    ] each-index ;
+
+: domain-stats ( domain -- stats )
+    (domains) all-pages [
+        created>> 1000 * millis>timestamp year>>
+    ] collect-by [ [ score>> ] map-sum ] assoc-map ;

diff --git a/extra/reddit/summary.txt b/extra/reddit/summary.txt
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+++ b/extra/reddit/summary.txt
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+Reddit API