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% Copyright (C) 2002-2003 David Roundy
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2, or (at your option)
% any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; see the file COPYING. If not, write to
% the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
% Boston, MA 02110-1301, USA.
FileName is an abstract type intended to facilitate the input and output of
unicode filenames.
\begin{code}
module FileName ( FileName( ),
fp2fn, fn2fp,
fn2ps, ps2fn,
niceps2fn, fn2niceps,
break_on_dir, norm_path, own_name, super_name,
patch_filename,
movedirfilename,
encode_white, decode_white,
(///),
breakup, is_explicitly_relative,
) where
import System.IO
import Data.Char ( isAlpha, isSpace, isDigit, chr, ord, toLower )
import qualified UTF8 ( encode )
import Data.Word ( Word8( ) )
import FastPackedString ( PackedString( ),
packWords, unpackPSfromUTF8, unpackPS, packString )
\end{code}
\begin{code}
newtype FileName = FN FilePath deriving ( Eq, Ord )
encode :: [Char] -> [Word8]
encode = UTF8.encode
instance Show FileName where
showsPrec d (FN fp) = showParen (d > app_prec) $ showString "fp2fn " . showsPrec (app_prec + 1) fp
where app_prec = 10
{-# INLINE fp2fn #-}
fp2fn :: FilePath -> FileName
fp2fn fp = FN fp
{-# INLINE fn2fp #-}
fn2fp :: FileName -> FilePath
fn2fp (FN fp) = fp
{-# INLINE niceps2fn #-}
niceps2fn :: PackedString -> FileName
niceps2fn = FN . decode_white . unpackPS
{-# INLINE fn2niceps #-}
fn2niceps :: FileName -> PackedString
fn2niceps (FN fp) = packString $ encode_white fp
{-# INLINE fn2ps #-}
fn2ps :: FileName -> PackedString
fn2ps (FN fp) = packWords $ encode $ encode_white fp
{-# INLINE ps2fn #-}
ps2fn :: PackedString -> FileName
ps2fn ps = FN $ decode_white $ unpackPSfromUTF8 ps
encode_white :: FilePath -> String
encode_white (c:cs) | isSpace c || c == '\\' =
'\\' : (show $ ord c) ++ "\\" ++ encode_white cs
encode_white (c:cs) = c : encode_white cs
encode_white [] = []
decode_white :: String -> FilePath
decode_white ('\\':cs) =
case break (=='\\') cs of
(theord, '\\':rest) ->
chr (read theord) : decode_white rest
_ -> error "malformed filename"
decode_white (c:cs) = c: decode_white cs
decode_white "" = ""
\end{code}
\begin{code}
own_name :: FileName -> FileName
own_name (FN f) = case breakLast '/' f of Nothing -> FN f
Just (_,f') -> FN f'
super_name :: FileName -> FileName
super_name fn = case norm_path fn of
FN f -> case breakLast '/' f of
Nothing -> FN "."
Just (d,_) -> FN d
break_on_dir :: FileName -> Maybe (FileName,FileName)
break_on_dir (FN p) = case breakFirst '/' p of
Nothing -> Nothing
Just (d,f) | d == "." -> break_on_dir $ FN f
| otherwise -> Just (FN d, FN f)
norm_path :: FileName -> FileName -- remove "./"
norm_path (FN p) = FN $ repath $ drop_dotdot $ breakup p
repath :: [String] -> String
repath [] = ""
repath [f] = f
repath (d:p) = d ++ "/" ++ repath p
drop_dotdot :: [String] -> [String]
drop_dotdot ("":p) = drop_dotdot p
drop_dotdot (".":p) = drop_dotdot p
drop_dotdot ("..":p) = ".." : (drop_dotdot p)
drop_dotdot (_:"..":p) = drop_dotdot p
drop_dotdot (d:p) = case drop_dotdot p of
("..":p') -> p'
p' -> d : p'
drop_dotdot [] = []
breakup :: String -> [String]
breakup p = case break (=='/') p of
(d,"") -> [d]
(d,p') -> d : breakup (tail p')
breakFirst :: Char -> String -> Maybe (String,String)
breakFirst c l = bf [] l
where bf a (r:rs) | r == c = Just (reverse a,rs)
| otherwise = bf (r:a) rs
bf _ [] = Nothing
breakLast :: Char -> String -> Maybe (String,String)
breakLast c l = case breakFirst c (reverse l) of
Nothing -> Nothing
Just (a,b) -> Just (reverse b, reverse a)
(///) :: FileName -> FileName -> FileName
(FN "")///b = norm_path b
a///b = norm_path $ fp2fn $ fn2fp a ++ "/" ++ fn2fp b
safeFileChar :: Char -> Char
safeFileChar c | isAlpha c = toLower c
| isDigit c = c
| isSpace c = '-'
safeFileChar _ = '_'
patch_filename :: String -> String
patch_filename summary = name ++ ".dpatch"
where name = map safeFileChar summary
movedirfilename :: FileName -> FileName -> FileName -> FileName
movedirfilename old new name =
if name' == old' then new
else if length name' > length old' &&
take (length old'+1) name' == old'++"/"
then fp2fn ("./"++new'++drop (length old') name')
else name
where old' = fn2fp $ norm_path old
new' = fn2fp $ norm_path new
name' = fn2fp $ norm_path name
\end{code}
\begin{code}
is_explicitly_relative :: String -> Bool
is_explicitly_relative ('.':'/':_) = True -- begins with "./"
is_explicitly_relative _ = False
\end{code}
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