Basic stuff works now

[yawbih.git] / Wiki.hs

diff --git a/Wiki.hs b/Wiki.hs
index c41effa9d481e63e5c7b41aa1aa5569504475287..d6ece0dc5f4d94829dd09bfd86f657be3927f781 100644 (file)
--- a/Wiki.hs
+++ b/Wiki.hs
@@ -1,40 +1,82 @@
 module Wiki (
-       WB
+       Backend (getCurrent,getList,get,setCurrent,update)
        ,PGB
+       ,createPGB
 
 ) where
 
 import Dbconnect
+import Data.Char
 
-class WB a where
+class Backend a where
        --Keyword -> (Full text,date)
-       getCurrent :: a -> String -> IO (String,String)
+       getCurrent :: a -> String -> IO (Maybe (String,String))
 
-       --Keyword -> [(id,date)]
-       getList :: a -> String -> IO [(String, String)]
+       --Keyword -> [(id,date,author,comment)]
+       getList :: a -> String -> IO [(String, String, String, String)]
 
        --Keyword -> id -> Full text
        get :: a -> String -> String -> IO String
 
        --Keyword -> id -> ()
-       setCurrent :: a -> String -> String -> IO ()
+       setCurrent :: a -> String -> String -> IO Bool
 
        --Keyword -> Full text -> id
-       addNew :: a -> String -> String -> IO String
+       update :: a -> String -> String -> String -> String -> IO String
 
-data PGB = PGB DBService
+data Markup = Text String
+       | Bold String
+       | Paragraph [Markup]
 
-createPGP host database user password = let db = createDBService host database "" user password Nothing in return (PGB db)
+type Document = [Markup]
 
+newtype PGB = PGB DBService
 
-instance WB PGB where
+createPGB :: String -> String -> String -> String -> IO PGB
+createPGB host database user password = let db = createDBService host database "" user password Nothing in return (PGB db)
 
-       getCurrent (PGB db) key = return ("","")
 
-       getList (PGB db) key = return [("","")]
+testDB = createPGB "wave" "wiki" "wiki" "12wiki34db"
+
+instance Backend PGB where
+
+       getCurrent (PGB db) key = do 
+               result <- selectReturnTuples db $ "SELECT fulltext,timestamp FROM curtexts WHERE keyword="++tov key
+               case result of
+                       [text,date]:_ -> return (Just (text,date))
+                       _ -> return Nothing
+
+       getList (PGB db) key = do
+               list <- selectReturnTuples db $ "SELECT id, timestamp, author, comment from fulltexts WHERE keyword = "++tov key
+               return $ map (\[id,date,author,comment] -> (id,date,author,comment)) list
 
        get (PGB db) key id = return ""
 
-       setCurrent (PGB db) key id = return ()
+       setCurrent (PGB db) key id = do
+               full <- selectReturnTuples db $ "SELECT keyword FROM fulltexts WHERE keyword="++tov key++" AND id='"++id++"'"
+               cur <- selectReturnTuples db $ "SELECT keyword FROM curtexts WHERE keyword="++tov key
+               case full of
+                       [[]] -> do
+                               return False
+                       _  -> do
+                               rows <- case cur of
+                                       [[]] -> do
+                                               execute db $ "INSERT INTO current (keyword, id) VALUES ("++tov key++","++tov id++")"
+                                       _  -> do
+                                               execute db $ "UPDATE current SET id = "++tov id++" WHERE keyword = "++tov key
+                               if rows == 1 then return True
+                                       else return False 
+
+       update (PGB db) key text author comment = do
+               rows <- execute db $ "INSERT INTO fulltexts (keyword,fulltext, author, comment) VALUES ("++tov key++","++tov text++","++tov author++","++tov comment++")"
+               if rows == 0 then return ""
+                       else do
+                               [[id]] <- selectReturnTuples db $ "SELECT currval('fulltexts_id_seq')" 
+                               setCurrent (PGB db) key id
+                               return id
+                       
+
+tov :: String -> String
+tov s = '\'':escapeQuery s++"'"
+               
 
-       addNew (PGB db) key text = return ""