extfs patchfs update

[Adam Byrtek 'alpha' <alpha student uci agh edu pl>]

Hello.

I've noticed, that patchfs is quite useless right now. I've updated it
to handle unified diffs (the most popular patch format), and I'm
working on the context diff format.

Now I work on fixing mailfs...

I'm including new patchfs as an attachment - if you want to, add it to
mc distribution.

Regards
alpha

ps. I've just subscribed to this list. I want to say I'm really happy,
that GNOME support has been thrown out of mc, and that the real mc is
now actively developed. Hope I can help...

-- 

  _.|._ |_  _.    : Adam Byrtek, alpha@(irc.pl|debian.org)
 (_|||_)| |(_|    : gg 1802819, pgp 0xB25952C0
     |            : jid alpha.jabberpl.org

#! /bin/sh

# Peter Daum <gator cs tu-berlin de> (Jan 1998, mc-4.1.22)

# modified to work with unified diffs, some additional fixes
# Adam Byrtek <alpha debian org>, 4 Dec 2002

# WARNING: look out for TAB (0x09) chars in sed patterns!
# (sed does not accept \t)


LC_ALL=C
export LC_ALL

# paths to used programs:
ncat=cat                  # regular cat
zcat=zcat                 # gunzip to stdout
bzcat="bzip2 -dc"         # bunzip2 to stdout
file=file                 # "file" command
sed=sed

filelist=FILELIST         # names for "special" files

patchfs_list ()
{
    # default attributes
    date=`date +"%b %d %H:%M"`
    perm="-r--r--r--"
    uid=00000000
    gid=00000000
    size=00000000
    nlink="  1"

    # filelist virtual file
    echo "$perm $nlink $uid $gid $size $date $filelist"

    $cat $1 |
    $sed -ne "/^--- / {
        s/^--- \([^ 	]*\).*/$perm $nlink $uid $gid $size $date \1/gp 
    }"
}

patchfs_copyout ()
{
    if [ "$2" = "$filelist" ]; then
        # list of all affected files
	$cat $1 |
        $sed -ne "/^--- / {
	    s/^--- \([^ 	]*\).*/\1/gp
	}" > $3
    else
        # escape '/' in filename
        fn=`echo $2 | $sed 's|/|\\\/|g'`
        $cat $1 | 
        $sed -ne "/^--- $fn/,/^--- / {
	    /^--- / {
	        /^--- $fn/p
	        d
	    }
            p
        }" > $3
     fi
     exit 0
}

patchfs_run ()
{
    exit 0
}

type=`$file $2`
case $type in
    *bzip*) cat=$bzcat ;;
    *gzip*) cat=$zcat ;;
    *text*) cat=$ncat ;;
    *) exit 1
esac

umask 077
case "$1" in
    list) patchfs_list $2; exit 0;;
    copyout) patchfs_copyout $2 $3 $4; exit 0;;
    run) patchfs_run; exit 0;;
esac

exit 1