{-# LANGUAGE CPP #-}

module Main where

import Network.Gitit

import Network.Gitit.Server

import Network.Gitit.Util (readFileUTF8)

import System.Directory

import Data.Maybe (isNothing)

import Data.Text.Encoding (encodeUtf8)

import Network.Gitit.Compat.Except()

import Control.Monad

import System.Log.Logger (Priority(..), setLevel, setHandlers,

getLogger, saveGlobalLogger)

import System.Log.Handler.Simple (fileHandler)

import System.Environment

import System.Exit

import System.IO (stderr)

import System.Console.GetOpt

import Network.Socket hiding (Debug)

import Data.Version (showVersion)

import qualified Data.ByteString.Char8 as B

import Data.ByteString.UTF8 (fromString)

import Paths_gitit (version, getDataFileName)

main :: IO ()

main = do

-- parse options to get config file

args <- getArgs >>= parseArgs

-- sequence in Either monad gets first Left or all Rights

opts <- case sequence args of

Left Help -> putErr ExitSuccess =<< usageMessage

Left Version -> do

progname <- getProgName

putErr ExitSuccess (progname ++ " version " ++

showVersion version ++ compileInfo ++ copyrightMessage)

Left PrintDefaultConfig -> getDataFileName "data/default.conf" >>=

readFileUTF8 >>= B.putStrLn . encodeUtf8 >> exitSuccess

Right xs -> return xs

conf' <- case [f | ConfigFile f <- opts] of

fs -> getConfigFromFiles fs

let conf = foldl handleFlag conf' opts

-- check for external programs that are needed

let repoProg = case repositoryType conf of

Mercurial -> "hg"

Darcs -> "darcs"

Git -> "git"

let prereqs = ["grep", repoProg]

forM_ prereqs $ \prog ->

findExecutable prog >>= \mbFind ->

when (isNothing mbFind) $ error $

"Required program '" ++ prog ++ "' not found in system path."

-- set up logging

let level = if debugMode conf then DEBUG else logLevel conf

logFileHandler <- fileHandler (logFile conf) level

serverLogger <- getLogger "Happstack.Server.AccessLog.Combined"

gititLogger <- getLogger "gitit"

saveGlobalLogger $ setLevel level $ setHandlers [logFileHandler] serverLogger

saveGlobalLogger $ setLevel level $ setHandlers [logFileHandler] gititLogger

-- setup the page repository, template, and static files, if they don't exist

createRepoIfMissing conf

createStaticIfMissing conf

createTemplateIfMissing conf

-- initialize state

initializeGititState conf

let serverConf = nullConf { validator = Nothing, port = portNumber conf,

timeout = 20, logAccess = Nothing }

-- open the requested interface

sock <- socket AF_INET Stream defaultProtocol

setSocketOption sock ReuseAddr 1

let portNum = show (portNumber conf)

addrs <- getAddrInfo Nothing (Just $ address conf) (Just portNum)

case addrs of

addr:_ -> bind sock $ addrAddress addr

[] -> error $ "Could not resolve " ++ address conf ++ ":" ++ portNum

listen sock 10

-- start the server

simpleHTTPWithSocket sock serverConf $ msum [ wiki conf

, dir "_reloadTemplates" reloadTemplates

]

data ExitOpt

= Help

| Version

| PrintDefaultConfig

data ConfigOpt

= ConfigFile FilePath

| Port Int

| Listen String

| Debug

deriving (Eq)

type Opt = Either ExitOpt ConfigOpt

flags :: [OptDescr Opt]

flags =

[ Option ['h'] ["help"] (NoArg (Left Help))

"Print this help message"

, Option ['v'] ["version"] (NoArg (Left Version))

"Print version information"

, Option ['p'] ["port"] (ReqArg (Right . Port . read) "PORT")

"Specify port"

, Option ['l'] ["listen"] (ReqArg (Right . Listen) "INTERFACE")

"Specify IP address to listen on"

, Option [] ["print-default-config"] (NoArg (Left PrintDefaultConfig))

"Print default configuration"

, Option [] ["debug"] (NoArg (Right Debug))

"Print debugging information on each request"

, Option ['f'] ["config-file"] (ReqArg (Right . ConfigFile) "FILE")

"Specify configuration file"

]

parseArgs :: [String] -> IO [Opt]

parseArgs argv =

case getOpt Permute flags argv of

(opts,_,[]) -> return opts

(_,_,errs) -> putErr (ExitFailure 1) . (concat errs ++) =<< usageMessage

usageMessage :: IO String

usageMessage = do

progname <- getProgName

return $ usageInfo ("Usage: " ++ progname ++ " [opts...]") flags

copyrightMessage :: String

copyrightMessage = "\nCopyright (C) 2008 John MacFarlane\n" ++

"This is free software; see the source for copying conditions. There is no\n" ++

"warranty, not even for merchantability or fitness for a particular purpose."

compileInfo :: String

compileInfo =

#ifdef _PLUGINS

" +plugins"

" -plugins"

handleFlag :: Config -> ConfigOpt -> Config

handleFlag conf Debug = conf{ debugMode = True, logLevel = DEBUG }

handleFlag conf (Port p) = conf { portNumber = p }

handleFlag conf (Listen l) = conf { address = l }

handleFlag conf _ = conf

putErr :: ExitCode -> String -> IO a

putErr c s = B.hPutStrLn stderr (fromString s) >> exitWith c