Import hs-plugins cvs

examples/makewith/unsafeio/Makefile

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+
+TEST=makewith/unsafeio
+
+TOP=../../..
+include ../../build.mk

examples/makewith/unsafeio/README

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+hmm. on 6.3  we need to add 'mtl' to a package dependency, other
+HSlang complains of a missing symbol. Is this a bug in the
+package.conf for HSlang?

examples/makewith/unsafeio/Unsafe.conf

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+{-# GLOBALOPTIONS -package posix #-}
+-- illustrates the use of static options in pragmas
+
+import System.IO.Unsafe
+import System.IO
+import System.Process
+
+resource = unsafe { field = date }
+
+-- illustrates the use of the devil's work
+date :: String
+date = unsafePerformIO $ do
+            (_,outh,_,proc) <- runInteractiveProcess "date" [] Nothing Nothing		
+    	    waitForProcess proc
+            s <- hGetContents outh
+            return s
+

examples/makewith/unsafeio/Unsafe.stub

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+
+module Unsafe ( resource, resource_dyn )  where
+
+import API
+import Data.Dynamic
+
+resource = unsafe
+
+--
+-- special
+--
+resource_dyn :: Dynamic
+resource_dyn = toDyn resource

examples/makewith/unsafeio/api/API.hs

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+{-# OPTIONS -fglasgow-exts #-}
+
+module API where
+
+import Data.Dynamic
+
+data Unsafe = Unsafe { 
+                field :: String 
+        }
+   deriving (Typeable, Show)
+
+unsafe :: Unsafe
+unsafe = Unsafe { field = "default value" }

examples/makewith/unsafeio/prog/Main.hs

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+import Plugins
+import API
+import Data.Either
+
+conf    = "../Unsafe.conf"
+stub    = "../Unsafe.stub"
+apipath = "../api"
+
+main = do
+        status <- makeWith conf stub ["-i"++apipath]
+        o <- case status of
+                MakeFailure e -> mapM_ putStrLn e >> error "failed"
+                MakeSuccess _ o -> return o
+        m_v   <- load o [apipath] [] "resource"
+        v <- case m_v of
+            LoadSuccess _ v -> return v
+            _               -> error "load failed"
+        let s = field v
+        makeCleaner o
+        if null s then print False else print True

examples/makewith/unsafeio/prog/README

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+this is an example of an application that uses the HSConf library to
+dynamically load compiled conf files.
+
+We use the .conf file in the parent directory, and communicate with
+the plugin via the API in the api_package/ directory.
+
+The plugin is a .o file
+The api is a GHC package archive

examples/makewith/unsafeio/prog/expected

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+True