341 lines
13 KiB
Haskell
341 lines
13 KiB
Haskell
{-# LANGUAGE FlexibleContexts, FlexibleInstances, MultiParamTypeClasses #-}
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{-# OPTIONS_GHC -F -pgmFtrhsx #-}
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{-|
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A web-based UI.
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-}
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module Commands.Web
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where
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import Control.Applicative.Error (Failing(Success,Failure))
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import Control.Concurrent
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import Control.Monad.Reader (ask)
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import Data.IORef (newIORef, atomicModifyIORef)
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import HSP hiding (Request,catch)
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import HSP.HTML (renderAsHTML)
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--import qualified HSX.XMLGenerator (XML)
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import Hack.Contrib.Constants (_TextHtmlUTF8)
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import Hack.Contrib.Response (set_content_type)
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import Hack.Handler.Happstack (runWithConfig,ServerConf(ServerConf))
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import Happstack.State.Control (waitForTermination)
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import Network.HTTP (urlEncode, urlDecode)
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import Network.Loli (loli, io, get, post, html, text, public)
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--import Network.Loli.Middleware.IOConfig (ioconfig)
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import Network.Loli.Type (AppUnit)
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import Network.Loli.Utils (update)
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import Options hiding (value)
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import System.Directory (getModificationTime)
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import System.IO.Storage (withStore, putValue, getValue)
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import System.Process (readProcess)
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import System.Time (ClockTime, getClockTime, diffClockTimes, TimeDiff(TimeDiff))
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import Text.ParserCombinators.Parsec (parse)
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-- import Text.XHtml hiding (dir, text, param, label)
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-- import Text.XHtml.Strict ((<<),(+++),(!))
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import qualified HSP (Request(..))
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import qualified Hack (Env, http)
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import qualified Hack.Contrib.Request (inputs, params, path)
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import qualified Hack.Contrib.Response (redirect)
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-- import qualified Text.XHtml.Strict as H
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import Commands.Add (ledgerAddTransaction)
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import Commands.Balance
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import Commands.Histogram
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import Commands.Print
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import Commands.Register
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import Ledger
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import Utils (openBrowserOn, readLedgerWithOpts)
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-- import Debug.Trace
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-- strace :: Show a => a -> a
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-- strace a = trace (show a) a
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tcpport = 5000 :: Int
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homeurl = printf "http://localhost:%d/" tcpport
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web :: [Opt] -> [String] -> Ledger -> IO ()
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web opts args l = do
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if Debug `elem` opts
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then do
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-- just run the server in the foreground
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putStrLn $ printf "starting web server on port %d in debug mode" tcpport
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server opts args l
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else do
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-- start the server (in background, so we can..) then start the web browser
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printf "starting web interface on port %d\n" tcpport
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tid <- forkIO $ server opts args l
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putStrLn "starting web browser"
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openBrowserOn homeurl
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waitForTermination
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putStrLn "shutting down web server..."
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killThread tid
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putStrLn "shutdown complete"
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getenv = ask
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response = update
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redirect u c = response $ Hack.Contrib.Response.redirect u c
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reqparam :: Hack.Env -> String -> [String]
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reqparam env p = map snd $ filter ((==p).fst) $ Hack.Contrib.Request.params env
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ledgerFileModifiedTime :: Ledger -> IO ClockTime
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ledgerFileModifiedTime l
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| null path = getClockTime
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| otherwise = getModificationTime path `Prelude.catch` \_ -> getClockTime
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where path = filepath $ journal l
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ledgerFileReadTime :: Ledger -> ClockTime
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ledgerFileReadTime l = filereadtime $ journal l
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reload :: Ledger -> IO Ledger
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reload l = do
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l' <- readLedgerWithOpts [] [] (filepath $ journal l)
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putValue "hledger" "ledger" l'
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return l'
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reloadIfChanged :: [Opt] -> [String] -> Ledger -> IO Ledger
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reloadIfChanged opts _ l = do
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tmod <- ledgerFileModifiedTime l
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let tread = ledgerFileReadTime l
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newer = diffClockTimes tmod tread > (TimeDiff 0 0 0 0 0 0 0)
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-- when (Debug `elem` opts) $ printf "checking file, last modified %s, last read %s, %s\n" (show tmod) (show tread) (show newer)
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if newer
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then do
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when (Verbose `elem` opts) $ printf "%s has changed, reloading\n" (filepath $ journal l)
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reload l
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else return l
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-- refilter :: [Opt] -> [String] -> Ledger -> LocalTime -> IO Ledger
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-- refilter opts args l t = return $ filterAndCacheLedgerWithOpts opts args t (journaltext l) (journal l)
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server :: [Opt] -> [String] -> Ledger -> IO ()
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server opts args l =
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-- server initialisation
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withStore "hledger" $ do -- IO ()
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putValue "hledger" "ledger" l
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-- XXX hack-happstack abstraction leak
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hostname <- readProcess "hostname" [] "" `catch` \_ -> return "hostname"
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runWithConfig (ServerConf tcpport hostname) $ -- (Env -> IO Response) -> IO ()
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\env -> do -- IO Response
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-- general request handler
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printf $ "request\n"
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let a = intercalate "+" $ reqparam env "a"
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p = intercalate "+" $ reqparam env "p"
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opts' = opts ++ [Period p]
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args' = args ++ (map urlDecode $ words a)
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l' <- fromJust `fmap` getValue "hledger" "ledger"
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l'' <- reloadIfChanged opts' args' l'
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-- declare path-specific request handlers
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let command :: [String] -> ([Opt] -> [String] -> Ledger -> String) -> AppUnit
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command msgs f = string msgs $ f opts' args' l''
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(loli $ -- State Loli () -> (Env -> IO Response)
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do
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get "/balance" $ command [] showBalanceReport -- String -> ReaderT Env (StateT Response IO) () -> State Loli ()
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get "/register" $ command [] showRegisterReport
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get "/histogram" $ command [] showHistogram
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get "/transactions" $ ledgerpage [] l'' (showTransactions opts' args')
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post "/transactions" $ handleAddform l''
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get "/env" $ getenv >>= (text . show)
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get "/params" $ getenv >>= (text . show . Hack.Contrib.Request.params)
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get "/inputs" $ getenv >>= (text . show . Hack.Contrib.Request.inputs)
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public (Just "Commands/Web") ["/static"]
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get "/" $ redirect ("transactions") Nothing
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) env
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ledgerpage :: [String] -> Ledger -> (Ledger -> String) -> AppUnit
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ledgerpage msgs l f = do
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env <- getenv
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l' <- io $ reloadIfChanged [] [] l
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hsp msgs $ const <div><% addform env %><pre><% f l' %></pre></div>
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-- | A loli directive to serve a string in pre tags within the hledger web
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-- layout.
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string :: [String] -> String -> AppUnit
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string msgs s = hsp msgs $ const <pre><% s %></pre>
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-- | A loli directive to serve a hsp template wrapped in the hledger web
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-- layout. The hack environment is passed in to every hsp template as an
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-- argument, since I don't see how to get it within the hsp monad.
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-- A list of messages is also passed, eg for form errors.
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hsp :: [String] -> (Hack.Env -> HSP XML) -> AppUnit
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hsp msgs f = do
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env <- getenv
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let contenthsp = f env
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pagehsp = hledgerpage env msgs title contenthsp
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html =<< (io $ do
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hspenv <- hackEnvToHspEnv env
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(_,xml) <- runHSP html4Strict pagehsp hspenv
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return $ addDoctype $ applyFixups $ renderAsHTML xml)
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response $ set_content_type _TextHtmlUTF8
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where
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title = ""
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addDoctype = ("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\">\n" ++)
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applyFixups = gsubRegexPR "\\[NBSP\\]" " "
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hackEnvToHspEnv :: Hack.Env -> IO HSPEnv
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hackEnvToHspEnv env = do
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x <- newIORef 0
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let req = HSP.Request (reqparam env) (Hack.http env)
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num = NumberGen (atomicModifyIORef x (\a -> (a+1,a)))
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return $ HSPEnv req num
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-- htmlToHsp :: Html -> HSP XML
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-- htmlToHsp h = return $ cdata $ showHtml h
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-- views
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hledgerpage :: Hack.Env -> [String] -> String -> HSP XML -> HSP XML
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hledgerpage env msgs title content =
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<html>
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<head>
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<meta http-equiv = "Content-Type" content = "text/html; charset=utf-8" />
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<link rel="stylesheet" type="text/css" href="/static/style.css" media="all" />
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<title><% title %></title>
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</head>
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<body>
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<% navbar env %>
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<div id="messages"><% intercalate ", " msgs %></div>
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<div id="content"><% content %></div>
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</body>
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</html>
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navbar :: Hack.Env -> HSP XML
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navbar env =
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<div id="navbar">
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<a href="http://hledger.org" id="hledgerorglink">hledger.org</a>
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<% navlinks env %>
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-- <% searchform env %>
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<a href="http://hledger.org/MANUAL.html" id="helplink">help</a>
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</div>
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getParamOrNull p = fromMaybe "" `fmap` getParam p
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navlinks :: Hack.Env -> HSP XML
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navlinks _ = do
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a <- getParamOrNull "a"
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p <- getParamOrNull "p"
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let addparams=(++(printf "?a=%s&p=%s" (urlEncode a) (urlEncode p)))
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link s = <a href=(addparams s) class="navlink"><% s %></a>
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<div id="navlinks">
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<% link "transactions" %> |
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<% link "register" %> |
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<% link "balance" %>
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</div>
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searchform :: Hack.Env -> HSP XML
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searchform env = do
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a <- getParamOrNull "a"
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p <- getParamOrNull "p"
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let resetlink | null a && null p = <span></span>
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| otherwise = <span id="resetlink">[NBSP]<a href=u>reset</a></span>
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where u = dropWhile (=='/') $ Hack.Contrib.Request.path env
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<form action="" id="searchform">
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[NBSP]account pattern:[NBSP]<input name="a" size="20" value=a
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/>[NBSP][NBSP]reporting period:[NBSP]<input name="p" size="20" value=p />
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<input type="submit" name="submit" value="filter" style="display:none" />
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<% resetlink %>
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</form>
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addform :: Hack.Env -> HSP XML
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addform env = do
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let inputs = Hack.Contrib.Request.inputs env
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date = fromMaybe "" $ lookup "date" inputs
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desc = fromMaybe "" $ lookup "desc" inputs
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<div>
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<div id="addform">
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<form action="" method="POST">
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<table border="0">
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<tr>
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<td>
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Date: <input size="15" name="date" value=date />[NBSP]
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Description: <input size="35" name="desc" value=desc />[NBSP]
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</td>
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</tr>
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<% transactionfields 1 env %>
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<% transactionfields 2 env %>
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<tr id="addbuttonrow"><td><input type="submit" value="add transaction" /></td></tr>
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</table>
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</form>
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</div>
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<br clear="all" />
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</div>
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transactionfields :: Int -> Hack.Env -> HSP XML
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transactionfields n env = do
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let inputs = Hack.Contrib.Request.inputs env
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acct = fromMaybe "" $ lookup acctvar inputs
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amt = fromMaybe "" $ lookup amtvar inputs
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<tr>
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<td>
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[NBSP][NBSP]
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Account: <input size="35" name=acctvar value=acct />[NBSP]
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Amount: <input size="15" name=amtvar value=amt />[NBSP]
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</td>
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</tr>
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where
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numbered = (++ show n)
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acctvar = numbered "acct"
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amtvar = numbered "amt"
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handleAddform :: Ledger -> AppUnit
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handleAddform l = do
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env <- getenv
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d <- io getCurrentDay
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handle $ validate env d
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where
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validate :: Hack.Env -> Day -> Failing Transaction
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validate env today =
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let inputs = Hack.Contrib.Request.inputs env
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date = fromMaybe "" $ lookup "date" inputs
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desc = fromMaybe "" $ lookup "desc" inputs
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acct1 = fromMaybe "" $ lookup "acct1" inputs
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amt1 = fromMaybe "" $ lookup "amt1" inputs
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acct2 = fromMaybe "" $ lookup "acct2" inputs
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amt2 = fromMaybe "" $ lookup "amt2" inputs
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validateDate "" = ["missing date"]
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validateDate _ = []
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validateDesc "" = ["missing description"]
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validateDesc _ = []
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validateAcct1 "" = ["missing account 1"]
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validateAcct1 _ = []
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validateAmt1 "" = ["missing amount 1"]
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validateAmt1 _ = []
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validateAcct2 "" = ["missing account 2"]
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validateAcct2 _ = []
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validateAmt2 _ = []
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amt1' = either (const missingamt) id $ parse someamount "" amt1
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amt2' = either (const missingamt) id $ parse someamount "" amt2
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t = Transaction {
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ltdate = parsedate $ fixSmartDateStr today date
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,lteffectivedate=Nothing
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,ltstatus=False
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,ltcode=""
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,ltdescription=desc
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,ltcomment=""
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,ltpostings=[
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Posting False acct1 amt1' "" RegularPosting
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,Posting False acct2 amt2' "" RegularPosting
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]
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,ltpreceding_comment_lines=""
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}
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(t', berr) = case balanceTransaction t of
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Right t'' -> (t'', [])
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Left e -> (t, [e])
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errs = concat [
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validateDate date
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,validateDesc desc
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,validateAcct1 acct1
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,validateAmt1 amt1
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,validateAcct2 acct2
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,validateAmt2 amt2
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] ++ berr
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in
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case null errs of
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False -> Failure errs
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True -> Success t'
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handle :: Failing Transaction -> AppUnit
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handle (Failure errs) = hsp errs addform
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handle (Success t) = do
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io $ ledgerAddTransaction l t >> reload l
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ledgerpage [msg] l (showTransactions [] [])
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where msg = printf "Added transaction:\n%s" (show t)
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