#! /bin/sh

#
# LHa Virtual filesystem executive v0.1
# Copyright (C) 1996, 1997 Joseph M. Hinkle
# May be distributed under the terms of the GNU Public License
# <jhinkle@rockisland.com>
#

# Code for mc_lha_fs_run() suggested by:
# Jan 97 Zdenek Kabelac <kabi@informatics.muni.cz>

# Tested with mc 3.5.18 and gawk 3.0.0 on Linux 2.0.0
# Tested with lha v1.01 and lharc v1.02
# Information and sources for other forms of lha/lzh appreciated

# Nota bene:
# There are several compression utilities which produce *.lha files.
# LHArc and LHa in exist several versions, and their listing output varies.
# Another variable is the architecture on which the compressed file was made.
# This program attempts to sort out the variables known to me, but it is likely
# to display an empty panel if it encounters a mystery.
# In that case it will be useful to execute this file from the command line:
# ./lha list Mystery.lha
# to examine the output directly on the console. The output string must be
# precisely in the format described in the README in this directory.
# Caveat emptor.
# Learn Latin.

# Define your awk
AWK=gawk

# Define which archiver you are using with appropriate options
LHA_LIST="lha lq"
LHA_GET="lha pq"
LHA_PUT="lha aq"

# The 'list' command executive

mc_lha_fs_list()
{
# List the contents of the archive and sort it out
$LHA_LIST "$1" | $AWK -v uid=`id -nu` -v gid=`id -ng` '
# Strip a leading '/' if present in a filepath
$(NF) ~ /^\// { $(NF) = substr($NF,2) }
# Print the line this way if there is no permission string
$1 ~ /^\[.*\]/ {
# Invent a generic permission
$1 = ($NF ~ /\/$/) ? "drwxr-xr-x":"-rwxr--r--";
# Print it
printf "%s 1 %-8s %-8s %-8d %s %s %s %s\n",
$1, uid, gid, $2, $4, $5, $6, $7;
# Get the next line of the list
next;
}
# Do it this way for a defined permission
$1 !~ /^\[.*\]/ {
# If the permissions and UID run together
if ($1 ~ /\//) {
$8 = $7;
$7 = $6;
$6 = $5;
$5 = $4;
$3 = $2;
$2 = substr($1,10);
$1 = substr($1,1,9);
}
# If the permission string is missing a type
if (length($1) == 9) {
if ($NF ~ /\/$/)
$1 = ("d" $1);
else
$1 = ("-" $1);
}
# UID:GID might not be the same as on your system so print numbers
# Well, that is the intent. At the moment mc is translating them.
split($2, id, "/");
printf "%s 1 %-8d %-8d %-8d %s %s %s %s\n",
$1, id[1], id[2], $3, $5, $6, $7, $8;
# Get the next line of the list
next;
}

'
}

# The 'copyout' command executive to copy displayed files to a destination

mc_lha_fs_copyout()
{
$LHA_GET "$1" "$2" > "$3"
}

# The 'copyin' command executive to add something to the archive

mc_lha_fs_copyin ()
{
NAME2=`basename "$2"`; DIR2=${2%$NAME2}
NAME3=`basename "$3"`; DIR3=${3%$NAME3}

cd "${DIR3}"

ONE2=${2%%/*}
[ -n "${ONE2}" ] || exit 1
[ -e "${ONE2}" ] && exit 1

[ -e "${DIR2}" ] || mkdir -p "${DIR2}"
ln "$3" "$2" || exit 1

$LHA_PUT "$1" "$2"
rm -r "${ONE2}"
}

# The 'run' command executive to run a command from within an archive

mc_lha_fs_run()
{
TMPDIR=`mktemp -d "${MC_TMPDIR:-/tmp}/mctmpdir-ulha.XXXXXX"` || exit 1
trap "rm -rf \"$TMPDIR\"; exit 0" 1 2 3 4 15
TMPCMD=$TMPDIR/run
$LHA_GET "$1" "$2" > $TMPCMD
chmod a+x "$TMPCMD"
"$TMPCMD"
rm -rf "$TMPDIR"
}


# The main routine
umask 077

cmd="$1"
shift

case "$cmd" in
list) mc_lha_fs_list "$@" ;;
copyout) mc_lha_fs_copyout "$@" ;;
copyin) mc_lha_fs_copyin "$@" ;;
run) mc_lha_fs_run "$@" ;;
*) exit 1 ;;
esac

exit 0