use options library for command line options

yesod/Devel.hs

@@ -145,7 +145,7 @@ rebuildGhc bf ld ar = do
 
 rebuildCabal :: String -> IO Bool
 rebuildCabal cmd = do
-  putStrLn "Rebuilding application... (cabal)"
+  putStrLn $ "Rebuilding application... (" ++ cmd ++ ")"
   exit <- rawSystemFilter cmd ["build"]
   return $ case exit of
              ExitSuccess -> True

yesod/Types.hs

@@ -0,0 +1,24 @@
+{-# LANGUAGE TemplateHaskell #-}
+
+module Types where
+
+import Options
+
+
+mkOptCabalDev name = option name (\o -> o
+  { optionLongFlags    = ["dev", "use-cabal-dev"]
+  , optionShortFlags   = ['d']
+  , optionType         = optionTypeBool
+  , optionDefault      = "false"
+  , optionDescription  = "use cabal-dev to build the package"
+  })
+
+mkOptNoApi name = option name (\o -> o
+  { optionLongFlags    = ["no-ghc-api"]
+  , optionShortFlags   = ['n']
+  , optionType         = optionTypeBool
+  , optionDefault      = "false"
+  , optionDescription  = "do not use the GHC API to build, use `cabal build' instead"
+  })
+
+

yesod/main.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE CPP #-}
+{-# LANGUAGE CPP, TemplateHaskell #-}
 
 import Scaffolding.Scaffolder
 import System.Environment (getArgs)
@@ -6,48 +6,63 @@ import System.Exit (exitWith)
 import System.Process (rawSystem)
 import Yesod.Core(yesodVersion)
 
-#ifndef WINDOWS
+import Options
+import Types
+
 import Build (touch)
-#endif
 import Devel (devel)
 
-windowsWarning :: String
+defineOptions "NoOptions" (return ())
-#ifdef WINDOWS
+
-windowsWarning = "\n                    (does not work on Windows)"
+defineOptions "DevelOptions" $ do
-#else
+  mkOptNoApi    "develOptNoApi"
-windowsWarning = ""
+
-#endif
+defineOptions "MainOptions" $ do
+  mkOptCabalDev "optCabalDev"
+
+type InitOptions      = NoOptions
+type ConfigureOptions = NoOptions
+type BuildOptions     = NoOptions
+type TouchOptions     = NoOptions
+type VersionOptions   = NoOptions
+
+cabalCommand :: MainOptions -> String
+cabalCommand mopt
+  | optCabalDev mopt = "cabal-dev"
+  | otherwise        = "cabal"
+
+main = runSubcommand
+      [ subcommand "init"      cmdInit
+      , subcommand "configure" cmdConfigure
+#ifndef WINDOWS
+      , subcommand "build"     cmdBuild
+      , subcommand "touch"     cmdTouch
+#endif
+      , subcommand "devel"     cmdDevel
+      , subcommand "version"   cmdVersion
+      ]
+
+cmdInit :: MainOptions -> InitOptions -> [String] -> IO ()
+cmdInit _ _ _ = scaffold
+
+cmdConfigure :: MainOptions -> ConfigureOptions -> [String] -> IO ()
+cmdConfigure mopt opts args = exitWith =<< rawSystem (cabalCommand mopt) ("configure":args)
+
+cmdBuild :: MainOptions -> BuildOptions -> [String] -> IO ()
+cmdBuild mopt opts args = do
+  touch
+  exitWith =<< rawSystem (cabalCommand mopt) ("build":args)
+
+cmdTouch :: MainOptions -> TouchOptions -> [String] -> IO ()
+cmdTouch _ _ _ = touch
+
+cmdDevel :: MainOptions -> DevelOptions -> [String] -> IO ()
+cmdDevel mopt opts args = devel (optCabalDev mopt) args
+    where
+      forceCabal = develOptNoApi opts
+
+cmdVersion :: MainOptions -> VersionOptions -> [String] -> IO ()
+cmdVersion _ _ _ = putStrLn $ "yesod-core version: " ++ yesodVersion
+
 
-main :: IO ()
-main = do
-    args' <- getArgs
-    let (isDev, args) =
-            case args' of
-                "--dev":rest -> (True, rest)
-                _ -> (False, args')
-    let cmd = if isDev then "cabal-dev" else "cabal"
-#ifndef WINDOWS
-    let build rest = rawSystem cmd $ "build":rest
-#endif
-    case args of
-        ["init"] -> scaffold
-#ifndef WINDOWS
-        "build":rest -> touch >> build rest >>= exitWith
-        ["touch"] -> touch
-#endif
-        "devel":rest -> devel isDev rest
-        ["version"] -> putStrLn $ "yesod-core version:" ++ yesodVersion
-        "configure":rest -> rawSystem cmd ("configure":rest) >>= exitWith
-        _ -> do
-            putStrLn "Usage: yesod <command>"
-            putStrLn "Available commands:"
-            putStrLn "    init         Scaffold a new site"
-            putStrLn "    configure    Configure a project for building"
-            putStrLn $ "    build        Build project (performs TH dependency analysis)"
-                ++ windowsWarning
-            putStrLn $ "    touch        Touch any files with altered TH dependencies but do not build"
-                ++ windowsWarning
-            putStrLn "    devel        Run project with the devel server"
-            putStrLn "                    use --dev devel to build with cabal-dev"
-            putStrLn "    version      Print the version of Yesod"
 

yesod/yesod.cabal

@@ -88,6 +88,7 @@ library
                    , shakespeare-css           >= 1.0      && < 1.1
                    , warp                      >= 1.2      && < 1.3
                    , blaze-html                >= 0.4.1.3  && < 0.5
+                   , options                   >= 0.1      && < 0.2
     exposed-modules: Yesod
     ghc-options:     -Wall