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Written by Ian Lynagh <igloo@debian.org>.
Copyright (C) 2003, 2004 Ian Lynagh.
Released under the GNU GPL version 2.
\begin{code}
module Main (main) where
import Control.Monad (when, unless)
import Data.Char (isAlphaNum, isAlpha)
import System.Directory (doesFileExist)
import System.Environment (getArgs)
import System.Exit (ExitCode(ExitSuccess, ExitFailure), exitWith)
import System.IO (hPutStrLn, stderr)
#ifdef COMPILERnhc98
import RE (match)
#else
import Text.Regex (mkRegex, matchRegex)
#endif
type Mapping = [(String, String)]
data Pos = Pos !Int !Int
data Verbosity = Quiet | Normal | Verbose
deriving Eq
data Action = Update | Check
data Flags = Flags { action :: Action,
verbosity :: Verbosity,
input_file :: Maybe FilePath,
output_file :: Maybe FilePath,
include_paths :: [FilePath] }
| HelpFlag
| VersionFlag
| ErrorFlag String
show_pos :: Pos -> String
show_pos (Pos c l) = "line " ++ show l ++ ", character " ++ show c
parse_args :: [String] -> Flags
parse_args = pa (Flags Update Normal Nothing Nothing ["@libdir@/haskell-utils"])
where pa fs []
= let fs1 = case input_file fs of
Nothing ->
fs { input_file = Just "debian/control.in" }
_ -> fs
fs2 = case (input_file fs1, output_file fs1) of
(Just i, Nothing) ->
case break ('.' ==) (reverse i) of
("ni", '.':rfn) ->
fs1 { output_file = Just (reverse rfn) }
_ -> ErrorFlag "Output filename not given or deducable"
_ -> fs1
in fs2
pa _ ("--help":_) = HelpFlag
pa _ ("-h":_) = HelpFlag
pa _ ("--version":_) = VersionFlag
pa _ ("-V":_) = VersionFlag
pa fs ("--update":as) = pa (fs { action = Update }) as
pa fs ("--check":as) = pa (fs { action = Check }) as
pa fs ("-v":as) = pa (fs { verbosity = Verbose }) as
pa fs ("-q":as) = pa (fs { verbosity = Quiet }) as
pa fs ("-I":d:as) = pa (fs { include_paths = d:include_paths fs }) as
pa _ ["-I"] = ErrorFlag "Missing argument to -I"
pa fs ("-i":f:as) = case input_file fs of
Nothing -> pa (fs { input_file = Just f }) as
Just _ -> ErrorFlag "Two input files given"
pa _ ["-i"] = ErrorFlag "Missing argument to -i"
pa fs ("-o":f:as) = case output_file fs of
Nothing -> pa (fs { output_file = Just f }) as
Just _ -> ErrorFlag "Two output files given"
pa _ ["-o"] = ErrorFlag "Missing argument to -o"
pa _ (a:_) = ErrorFlag ("Unknown argument: " ++ a)
main :: IO ()
main = do args <- getArgs
case parse_args args of
ErrorFlag s -> do hPutStrLn stderr s
exitWith (ExitFailure 1)
HelpFlag -> usage
VersionFlag -> show_version
Flags Update v (Just i) (Just o) ps -> update v i o ps
Flags Check v (Just i) (Just o) _ -> check v i o
_ -> error "update-haskell-control: Can't happen"
check :: Verbosity -> FilePath -> FilePath -> IO ()
check v i o
= do when (v == Verbose) $ do putStrLn $ "Input filename: " ++ i
putStrLn $ "Check filename: " ++ o
inp <- readFile i
out <- readFile o
let inp' = number inp
(re, warnings) = mk_regexp inp'
#ifndef COMPILERnhc98
re' = mkRegex re
#endif
unless (v == Quiet) $ mapM_ putStrLn warnings
when (v == Verbose) $ do putStrLn "Regexp:"
putStrLn re
#ifdef COMPILERnhc98
case match re out of
#else
case matchRegex re' out of
#endif
Nothing -> do putStrLn "File mismatch!"
exitWith (ExitFailure 1)
_ -> exitWith ExitSuccess
update :: Verbosity -> FilePath -> FilePath -> [FilePath] -> IO ()
update v i o ps
= do when (v == Verbose) $ do putStrLn $ "Input filename: " ++ i
putStrLn $ "Output filename: " ++ o
putStrLn $ "Search path:"
mapM_ (putStrLn . (" " ++)) ps
inp <- readFile i
mss <- mapM (get_varmappings v ps) ["ghc6", "ghc5", "nhc98", "hugs"]
let ms = concat mss
let inp' = number inp
(inp'', warnings) = apply ms inp'
unless (v == Quiet) $ mapM_ putStrLn warnings
writeFile o inp''
get_varmappings :: Verbosity -> [FilePath] -> FilePath -> IO Mapping
get_varmappings v [] f
= do unless (v == Quiet) $ putStrLn $ f ++ " varfile not found"
return []
get_varmappings v (p:ps) f
= do let f' = p ++ "/" ++ f ++ "_vars"
exists <- doesFileExist f'
if exists
then do when (v == Verbose) $ putStrLn $ "Loading " ++ f'
xs <- readFile f'
let mes = map mk_maplet $ zip [1..] $ filter ("" /=) $ lines xs
es = [ e | Right e <- mes ]
ms = [ m | Left m <- mes ]
if null es
then do return ms
else do mapM_ (hPutStrLn stderr) es
exitWith (ExitFailure 1)
else do when (v == Verbose) $ putStrLn $ f' ++ " not found"
get_varmappings v ps f
mk_maplet :: (Int, String) -> Either (String, String) String
mk_maplet (n, xs) = case break ('=' ==) xs of
("", _) -> Right $ "No variable name on line " ++ s
(ys, '=':'"':zs) -> case read_val "" zs of
Left zs' -> Left (ys, zs')
Right err -> Right err
_ -> Right bvb
where s = show n
read_val acc "\"" = Left (reverse acc)
read_val _ [] = Right bvb
read_val _ [_] = Right bvb
read_val acc ('\\':'n':ys) = read_val ('\n':acc) ys
read_val acc ('\\':y:ys) = read_val (y:acc) ys
read_val acc (y:ys) = read_val (y:acc) ys
bvb = "Bad variable binding on line " ++ s
number :: String -> [(Char, Pos)]
number = f (Pos 1 1)
where f _ "" = []
f p@(Pos _ l) ('\n':xs) = seq p $ ('\n', p):f (Pos 1 (l+1)) xs
f p@(Pos c l) (x:xs) = seq p $ (x, p):f (Pos (c+1) l) xs
apply :: Mapping -> [(Char, Pos)] -> (String, [String])
apply m = f "" []
where f res ws [] = (reverse res, reverse ws)
f res ws (('\\', _):(x, _):xs) = f (x:res) ws xs
f res ws [('$', p)] = f ('$':res) (bvs p:ws) []
f res ws (('$', p):xs)
= case get_var_name xs of
Nothing -> f ('$':res) (bvs p:ws) xs
Just (n, xs') -> case lookup n m of
Nothing -> f ('$':res) (uv n p:ws) xs
Just v ->
f res ws (map (\c -> (c, p)) v ++ xs')
f res ws ((x, _):xs) = f (x:res) ws xs
bvs p = "Bad variable spec at " ++ show_pos p
uv v p = "Unbound variable " ++ v ++ " at " ++ show_pos p
mk_regexp :: [(Char, Pos)] -> (String, [String])
mk_regexp = f "" []
where f res ws [] = ("^" ++ reverse res ++ "$", reverse ws)
f res ws (('\\', _):('n', _):xs) = f ('\n':res) ws xs
f res ws (('\\', _):(x, _):xs) = f (esc x ++ res) ws xs
f res ws [('$', p)] = f ("$\\" ++ res) (bvs p:ws) []
f res ws (('$', p):xs)
= case get_var_name xs of
Nothing -> f ("$\\" ++ res) (bvs p:ws) xs
Just (_, xs') -> f ("*." ++ res) ws xs'
f res ws ((x, _):xs) = f (esc x ++ res) ws xs
bvs p = "Bad variable spec at " ++ show_pos p
esc c | c `elem` ".[\\(*+?{|^$" = [c, '\\']
| otherwise = [c]
get_var_name :: [(Char, Pos)] -> Maybe (String, [(Char, Pos)])
get_var_name (('{', _):xs) = case break (('}' ==) . fst) xs of
(ys, _:zs) -> Just (map fst ys, zs)
_ -> Nothing
get_var_name xs@((c, _):_)
| isAlpha c = case span (\(x, _) -> isAlphaNum x || x == '_') xs of
(ys, zs) -> Just (map fst ys, zs)
get_var_name _ = Nothing
usage :: IO ()
usage =
do putStrLn "Usage: update-haskell-control [ --help | -h | --version | -V ]"
putStrLn " update-haskell-control [ OPTION ]..."
putStrLn ""
putStrLn " --update Update output filename (default)"
putStrLn " --check Check output filename"
putStrLn " -i filename Input filename"
putStrLn " -o filename Output filename"
putStrLn " -I path Add search path"
putStrLn " -v Verbose"
putStrLn " -q Input filename"
putStrLn ""
show_version :: IO ()
show_version = do putStrLn "update-haskell-control @version@"
putStrLn "Written by Ian Lynagh."
putStrLn "Copyright (C) 2004 Ian Lynagh."
\end{code}
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