Copy the right ghc-pkg.bin into bindists

[ghc-hetmet.git] / utils / runghc / runghc.hs

diff --git a/utils/runghc/runghc.hs b/utils/runghc/runghc.hs
index 1d4907d..e2cea31 100644 (file)
--- a/utils/runghc/runghc.hs
+++ b/utils/runghc/runghc.hs
@@ -11,62 +11,91 @@
 -- runghc program, for invoking from a #! line in a script.  For example:
 --
 --   script.lhs:
---     #! /usr/bin/runghc
---     > main = putStrLn "hello!"
+--      #! /usr/bin/runghc
+--      > main = putStrLn "hello!"
 --
 -- runghc accepts one flag:
 --
---     -f <path>    specify the path
+--      -f <path>    specify the path
 --
 -- -----------------------------------------------------------------------------
 
-module Main where
+module Main (main) where
 
 import System.Environment
 import System.IO
 import Data.List
 import System.Exit
 import Data.Char
+import System.Directory ( removeFile )
+import Control.Exception  ( bracket )
+import System.Directory ( findExecutable, getTemporaryDirectory )
+import System.Cmd       ( rawSystem )
 
-import Compat.RawSystem        ( rawSystem )
-import Compat.Directory        ( findExecutable )
+main :: IO ()
+main = do
+    args <- getArgs
+    case getGhcLoc args of
+        (Just ghc, args') -> doIt ghc args'
+        (Nothing, args') -> do
+            mb_ghc <- findExecutable "ghc"
+            case mb_ghc of
+                Nothing  -> dieProg ("cannot find ghc")
+                Just ghc -> doIt ghc args'
 
-main = do 
-  args <- getArgs
-  case args of
-    ('-':'f' : ghc) : args -> do
-       doIt (dropWhile isSpace ghc) args
-    args -> do
-       mb_ghc <- findExecutable "ghc"
-       case mb_ghc of
-         Nothing  -> dieProg ("cannot find ghc")
-         Just ghc -> doIt ghc args
+getGhcLoc :: [String] -> (Maybe FilePath, [String])
+getGhcLoc ("-f" : ghc : args) = (Just ghc, args)
+getGhcLoc (('-' : 'f' : ghc) : args) = (Just ghc, args)
+-- If you need the first GHC flag to be a -f flag then you can pass --
+-- first
+getGhcLoc ("--" : args) = (Nothing, args)
+getGhcLoc args = (Nothing, args)
 
+doIt :: String -> [String] -> IO ()
 doIt ghc args = do
-  let
-    (ghc_args, rest) = break notArg args
-  --
-  case rest of
-     [] -> dieProg "syntax: runghc [-f GHCPATH] [GHC-ARGS] FILE ARG..."
-     filename : prog_args -> do
-         res <- rawSystem ghc (
-                       "-ignore-dot-ghci" : ghc_args ++ 
-                       [ "-e","System.Environment.withProgName "++show filename++" (System.Environment.withArgs ["
-                         ++ concat (intersperse "," (map show prog_args))
-                         ++ "] (GHC.TopHandler.runIOFastExit Main.main))", filename])
-               -- runIOFastExit: makes exceptions raised by Main.main
-               -- behave in the same way as for a compiled program.
-               -- The "fast exit" part just calls exit() directly
-               -- instead of doing an orderly runtime shutdown,
-               -- otherwise the main GHCi thread will complain about
-               -- being interrupted.
-         exitWith res
+    let (ghc_args, rest) = getGhcArgs args
+    case rest of
+        [] -> do
+           -- behave like typical perl, python, ruby interpreters:      
+           -- read from stdin
+           tmpdir <- getTemporaryDirectory
+           bracket
+             (openTempFile tmpdir "runghcXXXX.hs")
+             (\(filename,_) -> removeFile filename)
+             $ \(filename,h) -> do
+                 getContents >>= hPutStr h
+                 hClose h
+                 doIt ghc (ghc_args ++ [filename])
+        filename : prog_args -> do
+            let c1 = ":set prog " ++ show filename
+                c2 = ":main " ++ show prog_args
+            res <- rawSystem ghc (["-ignore-dot-ghci"] ++ ghc_args ++
+                                  [ "-e", c1, "-e", c2, filename])
+            exitWith res
 
-notArg ('-':_) = False
-notArg _       = True
+getGhcArgs :: [String] -> ([String], [String])
+getGhcArgs args
+ = let (ghcArgs, otherArgs) = case break pastArgs args of
+                              (xs, "--":ys) -> (xs, ys)
+                              (xs, ys)      -> (xs, ys)
+   in (map unescape ghcArgs, otherArgs)
+    where unescape ('-':'-':'g':'h':'c':'-':'a':'r':'g':'=':arg) = arg
+          unescape arg = arg
+
+pastArgs :: String -> Bool
+-- You can use -- to mark the end of the flags, in case you need to use
+-- a file called -foo.hs for some reason. You almost certainly shouldn't,
+-- though.
+pastArgs "--" = True
+pastArgs ('-':_) = False
+pastArgs _       = True
 
 dieProg :: String -> IO a
 dieProg msg = do
-  p <- getProgName
-  hPutStrLn stderr (p ++ ": " ++ msg)
-  exitWith (ExitFailure 1)
+    p <- getProgName
+    hPutStrLn stderr (p ++ ": " ++ msg)
+    exitWith (ExitFailure 1)
+
+-- usage :: String
+-- usage = "syntax: runghc [-f GHC-PATH | --] [GHC-ARGS] [--] FILE ARG..."
+