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Editing: ulha

#! /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

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Editing: ulha

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