139 lines
5.3 KiB
Haskell
139 lines
5.3 KiB
Haskell
{-|
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A happs-based web UI for hledger.
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-}
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module WebCommand
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where
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import qualified Data.Map as M
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import Data.Map ((!))
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import Data.Time.Clock
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import Data.Time.Format
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import System.Locale
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import Control.Concurrent
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import qualified Data.ByteString.Lazy.Char8 as B
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-- import qualified Text.StringTemplate as T
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-- import Codec.Compression.GZip (compress)
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-- import Data.ByteString.UTF8 (fromString)
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import HAppS.Server
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import System.Cmd (system)
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import System.Info (os)
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import System.Exit
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import Ledger
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import Options
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import BalanceCommand
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import RegisterCommand
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import PrintCommand
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-- | The application state when running the ui command.
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data AppState = AppState {
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aw :: Int -- ^ window width
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,ah :: Int -- ^ window height
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,amsg :: String -- ^ status message
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,aopts :: [Opt] -- ^ command-line opts
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,aargs :: [String] -- ^ command-line args
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,aledger :: Ledger -- ^ parsed ledger
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,abuf :: [String] -- ^ lines of the current buffered view
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-- ^ never null, head is current location
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} deriving (Show)
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tcpport = 5000
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web :: [Opt] -> [String] -> Ledger -> IO ()
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web opts args l = do
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putStrLn $ printf "starting web server on port %d" tcpport
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tid <- forkIO $ simpleHTTP nullConf{port=tcpport} $ handlers opts args l
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putStrLn "starting web browser"
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browseUrl $ printf "http://localhost:%s/print" (show tcpport)
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waitForTermination
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putStrLn "shutting down..."
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killThread tid
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putStrLn "shutdown complete"
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template r = printf (
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"<div style=float:right>" ++
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"<form action=%s>search: <input name=a value=%s></form>" ++
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"</div>" ++
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"<div align=center style=width:100%%%%>" ++
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" <a href=print>ledger</a>" ++
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" | <a href=register>register</a>" ++
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" | <a href=balance>balance</a>" ++
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"</div>" ++
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"<pre>%%s</pre>")
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(dropWhile (=='/') $ rqUri r)
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(fromMaybe "" $ queryValue "a" r)
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type Handler = ServerPart Response
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handlers :: [Opt] -> [String] -> Ledger -> [Handler]
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handlers opts args l =
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[
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dir "print" [withRequest $ \r -> respond r $ printreport r]
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, dir "register" [withRequest $ \r -> respond r $ registerreport r]
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, dir "balance" [withRequest $ \r -> respond r $ balancereport r]
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]
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where
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respond r = ok . setContentType "text/html" . toResponse . (printf (template r) :: String -> String)
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printreport r = showEntries opts (pats r ++ args) l
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registerreport r = showRegisterReport opts (pats r ++ args) l
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balancereport r = showBalanceReport (opts++[SubTotal]) (pats r ++ args) l
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pats r = as -- ++ if null ds then [] else ("--":ds)
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where (as,ds) = (queryValues "a" r, queryValues "d" r)
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queryValues :: String -> Request -> [String]
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queryValues q r = map (B.unpack . inputValue . snd) $ filter ((==q).fst) $ rqInputs r
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queryValue :: String -> Request -> Maybe String
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queryValue q r = case filter ((==q).fst) $ rqInputs r of
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[] -> Nothing
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is -> Just $ B.unpack $ inputValue $ snd $ head is
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-- | Attempt to open a web browser on the given url, all platforms.
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browseUrl :: String -> IO ExitCode
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browseUrl u = trybrowsers browsers u
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where
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trybrowsers (b:bs) u = do
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e <- system $ printf "%s %s" b u
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case e of
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ExitSuccess -> return ExitSuccess
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ExitFailure _ -> trybrowsers bs u
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trybrowsers [] u = do
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putStrLn $ printf "Sorry, I could not start a browser (tried: %s)" $ intercalate ", " browsers
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putStrLn $ printf "Please open your browser and visit %s" u
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return $ ExitFailure 127
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browsers | os=="darwin" = ["open -a firefox", "open"]
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| os=="mingw32" = ["firefox","safari","opera","iexplore"]
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| otherwise = ["firefox","sensible-browser"]
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-- jeffz: write a ffi binding for it using the Win32 package as a basis
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-- start by adding System/Win32/Shell.hsc and follow the style of any
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-- other module in that directory for types, headers, error handling and
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-- what not.
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-- ::ShellExecute(NULL, "open", "www.somepage.com", NULL, NULL, SW_SHOWNORMAL);
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-- ::ShellExecute(NULL, "open", "firefox.exe", "www.somepage.com" NULL, SW_SHOWNORMAL);
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withExpiresHeaders :: ServerPart Response -> ServerPart Response
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withExpiresHeaders sp = require getCacheTime $ \t -> [liftM (setHeader "Expires" $ formatDateTime "%a, %d %b %Y %T GMT" t) sp]
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getCacheTime :: IO (Maybe UTCTime)
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getCacheTime = getCurrentTime >>= (return . Just . addMinutes 360)
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addMinutes :: Int -> UTCTime -> UTCTime
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addMinutes n = addUTCTime (fromIntegral n)
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formatDateTime :: String -> UTCTime -> String
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formatDateTime = formatTime defaultTimeLocale
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setContentType :: String -> Response -> Response
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setContentType = setHeader "Content-Type"
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setFilename :: String -> Response -> Response
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setFilename = setHeader "Content-Disposition" . \fname -> "attachment: filename=\"" ++ fname ++ "\""
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-- gzipBinary :: Response -> Response
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-- gzipBinary r@(Response {rsBody = b}) = setHeader "Content-Encoding" "gzip" $ r {rsBody = compress b}
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-- acceptsZip :: Request -> Bool
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-- acceptsZip req = isJust $ M.lookup (fromString "accept-encoding") (rqHeaders req)
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