.lessfilter

#!/bin/sh
#
# lessfile/lesspipe
# $Id: lessopen,v 1.4 1998/05/12 09:37:46 torin Exp $
# Plus POSIX sh changes by Y.Dirson
#
# Less filter for viewing non text files.
#
# Written by: Behan Webster <behanw@pobox.com>
# Many Modifications by Darren Stalder
# Further Modifications by Thomas Schoepf <schoepf@debian.org>
#
# combined lessfile and lesspipe to avoid duplication of decode stage
# shell is sure icky.  I'm real tempted to rewrite the whole thing in Perl
#
# Unfortunately, this means that I have filename dependencies sprinkled
# throughout the code.  If you don't want lessfile to be called that,
# you'll need to change the LESSFILE envar below.
#
# Usage: eval `lessfile`  or eval `lesspipe`
#
# less passes in:
#    $1  filename to be viewed with less  (used by LESSOPEN)
# and possibly (if used by lessfile)
#    $2  filename that was created during LESSOPEN

TMPDIR=${TMPDIR:-/tmp}
BASENAME=`basename $0`
LESSFILE=lessfile

# Helper function to list contents of ISO files (CD images)
iso_list() {
   isoinfo -d -i "$1"
   isoinfo -d -i "$1" | grep -q ^Rock\.Ridge && iiopts="$iiopts -R"
   isoinfo -d -i "$1" | grep -q ^Joliet && iiopts="$iiopts -J"
   echo
   isoinfo -f $iiopts -i "$1"
}

if [ $# -eq 1 ] ; then
   # we were called as LESSOPEN

   # if the file doesn't exist, we don't do anything
   if [ ! -r "$1" ]; then
      exit 0
   fi

   # generate filename for possible use by lesspipe
   umask 077
   if [ $BASENAME = $LESSFILE ]; then
      TMPFILE=`tempfile -d $TMPDIR -p lessf`
      if [ -z "$TMPFILE" ]; then
         echo >&2 "Could not find 'tempfile' - using insecure temp file"
         TMPFILE="$TMPDIR/lessf.$USER.$$"
      fi
   fi

   (
      # possibly redirect stdout to a file for lessfile
      if [ $BASENAME = $LESSFILE ]; then exec > $TMPFILE; fi

      # Allow for user defined filters
      #if [ -x ~/.lessfilter -a -O ~/.lessfilter ]; then
#     if [ -x ~/.lessfilter ]; then
#        ~/.lessfilter "$1"
#        if [ $? -eq 0 ]; then
#           if [ $BASENAME = $LESSFILE ]; then
#              if [ -s $TMPFILE ]; then
#                 echo $TMPFILE
#              else
#                 rm -f $TMPFILE
#              fi
#           fi
#           exit 0
#        fi
#     fi

      # Decode file for less
      case `echo "$1" | tr '[:upper:]' '[:lower:]'` in
            *.xls)
                xls2csv "$1" ;;
            *.sxw|*.sxi)
                antiOO "$1" ;;
         *.arj)
            if [ -x "`which unarj`" ]; then unarj l "$1"
            else echo "No unarj available"; fi ;;

         *.tar.bz2)
            if [ -x "`which bunzip2`" ]; then
               bunzip2 -dc "$1" | tar tvvf -
            else echo "No bunzip2 available"; fi ;;

         *.bz)
            if [ -x "`which bunzip`" ]; then bunzip -c "$1"
            else echo "No bunzip available"; fi ;;

         *.bz2)
            if [ -x "`which bunzip2`" ]; then bunzip2 -dc "$1"
            else echo "No bunzip2 available"; fi ;;

         *.deb|*.udeb)
            echo "$1:"; dpkg --info "$1"
            echo
            echo '*** Contents:'; dpkg-deb --contents "$1"
            ;;

         *.doc|*.rtf)
            if [ -x "`which catdoc`" ]; then catdoc "$1"; fi ;;

         *.docx)
            if [ -x "`which docx2txt`" ]; then docx2txt "$1" -; fi ;;

         *.gif|*.jpeg|*.jpg|*.pcd|*.png|*.tga|*.tiff|*.tif)
            if [ -x "`which identify`" ]; then
               identify "$1"
            else
               echo "No identify available"
               echo "Install ImageMagick to browse images"
            fi
            ;;

         *.iso)
            if [ -x "`which isoinfo`" ]; then iso_list "$1"; fi ;;

         *.json)
            cat "$1" | python -m json.tool;;

         *.bin|*.raw)
            if [ -x "`which isoinfo`" ]; then
               file "$1" | grep -q ISO\.9660 && iso_list "$1"
            fi
            ;;

         *.lha|*.lzh)
            if [ -x "`which lha`" ]; then lha v "$1"
            else echo "No lha available"; fi ;;

         *.pdf)
            if [ -x "`which pdftotext`" ]; then pdftotext "$1" -
            else echo "No pdftotext available"; fi ;;

         *.rar|*.r[0-9][0-9])
            if [ -x "`which rar`" ]; then rar v "$1"
            elif [ -x "`which unrar`" ]; then unrar v "$1"
            else echo "No rar or unrar available"; fi ;;

         *.rpm)
            if [ -x "`which rpm`" ]; then
               echo "$1:"; rpm -q -i -p "$1"
               echo
               echo '*** Contents:'
               rpm -q -l -p "$1"
            else echo "rpm isn't available, no query on rpm package possible"; fi ;;

         *.tar.gz|*.tgz|*.tar.z|*.tar.dz)
            tar tzvf "$1" ;;

         # Note that this is out of alpha order so that we don't catch
         # the gzipped tar files.
         *.gz|*.z|*.dz)
            gzip -dc "$1" ;;

         *.tar)
            tar tvf "$1" ;;

         *.jar|*.war|*.xpi|*.zip)
            if [ -x "`which unzip`" ]; then unzip -v "$1";
            elif [ -x "`which miniunzip`" ]; then miniunzip -l "$1";
            elif [ -x "`which miniunz`" ]; then miniunz -l "$1";
            else echo "No unzip, miniunzip or miniunz available"; fi ;;

         *.zoo)
            if [ -x "`which zoo`" ]; then zoo v "$1";
            elif [ -x "`which unzoo`" ]; then unzoo -l "$1";
            else echo "No unzoo or zoo available"; fi ;;

      esac
   ) 2>/dev/null

   if [ $BASENAME = $LESSFILE ]; then
      if [ -s $TMPFILE ]; then
         echo $TMPFILE
      else
         rm -f $TMPFILE
      fi
   fi

elif [ $# -eq 2 ] ; then
   #
   # we were called as LESSCLOSE
   # delete the file created if we were lessfile
   #
   if [ $BASENAME = $LESSFILE ]; then
    if [ -n "$BASH" ]; then
      if [ ! -O "$2" ]; then
        echo "Error in deleting $2" > /dev/tty
      fi
    fi

      if [ -f "$2" ]; then
         rm -f "$2"
      else
         echo "Error in deleting $2" > /dev/tty
      fi
   fi

elif [ $# -eq 0 ] ; then
   #
   # must setup shell to use LESSOPEN/LESSCLOSE
   #
   # I have no idea how some of the more esoteric shells (es, rc) do
   # things. If they don't do things in a Bourne manner, send me a patch
   # and I'll incorporate it.
   #

   # first determine the full path of lessfile/lesspipe
   # if you can determine a better way to do this, send me a patch, I've
   # not shell-scripted for many a year.
   FULLPATH=`cd \`dirname $0\`;pwd`/$BASENAME

   case "$SHELL" in
      *csh)
         if [ $BASENAME = $LESSFILE ]; then
            echo "setenv LESSOPEN \"$FULLPATH %s\";"
            echo "setenv LESSCLOSE \"$FULLPATH %s %s\";"
         else
            echo "setenv LESSOPEN \"| $FULLPATH %s\";"
            echo "setenv LESSCLOSE \"$FULLPATH %s %s\";"
         fi
         ;;
      *)
         if [ $BASENAME = $LESSFILE ]; then
            echo "export LESSOPEN=\"$FULLPATH %s\";"
            echo "export LESSCLOSE=\"$FULLPATH %s %s\";"
         else
            echo "export LESSOPEN=\"| $FULLPATH %s\";"
            echo "export LESSCLOSE=\"$FULLPATH %s %s\";"
         fi
         ;;
   esac

   #echo "# If you tried to view a file with a name that starts with '#', you"
   #echo "# might see this message instead of the file's contents."
   #echo "# To view the contents, try to put './' ahead of the filename when"
   #echo "# calling less."

else
   echo "Usage: eval \`$BASENAME\`"
   exit
fi