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✏️ Editing: lesspipe

#!/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=${TMPDIR:-/tmp}
CONFIGDIR=${XDG_CONFIG_HOME:-~/.config}
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=`mktemp -p $TMPDIR lessfXXXXXX`
		if [ -z "$TMPFILE" ]; then
			echo >&2 "TMPFILE variable is empty. Exiting"
		exit 1
		fi
	fi

(
		# Allow for user defined filters
		USERFILTER=
		if [ -x "$CONFIGDIR/lessfilter" ]; then
			USERFILTER="$CONFIGDIR/lessfilter"
		elif [ -x ~/.lessfilter ]; then
			USERFILTER=~/.lessfilter
		fi
		if [ -n "$USERFILTER" ]; then
			if [ $BASENAME = $LESSFILE ]; then
				"$USERFILTER" "$1" > $TMPFILE
				if [ $? -eq 0 ]; then
					if [ -s $TMPFILE ]; then
						echo $TMPFILE
					else
						rm -f $TMPFILE
					fi
					exit 0
				else
					rm -f $TMPFILE
				fi
			else
				"$USERFILTER" "$1" && exit 0
			fi
		fi

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

# Decode file for less
		case `echo "$1" | tr '[:upper:]' '[:lower:]'` in
			*.a)
				if [ -x "`which ar`" ]; then ar tv "$1"
				else echo "No ar available"; fi ;;

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

*.doc)
				if [ -x "`which catdoc`" ]; then
					catdoc "$1"
				else
					# no catdoc, read normally if file is text.
					if ( file "$1" | grep ASCII 2>/dev/null >/dev/null); then
						cat "$1"
					else
						echo "No catdoc available";
					fi
				fi
				;;

*.egg)
				if [ -x "`which unzip`" ]; then
					unzip -p "$1" EGG-INFO/PKG-INFO | \
						sed '/^Description:/,/^\S/{/^Description:/d; /^\S/b; d}'
					echo
					unzip -v "$1"
				else
					echo "No unzip available"
				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"
				else
					echo "No isoinfo available"
					echo "Install mkisofs to view ISO images"
				fi
				;;

*.bin|*.raw)
				if [ -x "`which isoinfo`" ]; then
					file "$1" | grep -q ISO\.9660 && iso_list "$1"
				else
					echo "No isoinfo available"
					echo "Install mkisofs to view ISO images"
				fi
				;;

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

*.tar.lz|*.tlz)
				if [ -x "`which lzip`" ]; then
					lzip -dc "$1" | tar tvvf -
				elif [ -x "`which lunzip`" ]; then
					lunzip -dc "$1" | tar tvvf -
				else echo "No lzip or lunzip available"; fi ;;

*.lz)
				if [ -x "`which lzip`" ]; then lzip -dc "$1"
				elif [ -x "`which lunzip`" ]; then lunzip -dc "$1"
				else echo "No lzip or lunzip available"; fi ;;

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

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

*.pdf)
				if [ -x "`which pdftotext`" ]; then pdftotext -layout "$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 ;;

*.snap)
                            if [ -x "`which snap`" ]; then snap info "$1"; fi
                            if [ -x "`which unsquashfs`" ]; then
                                echo
                                echo '*** Contents:'; unsquashfs -ll -d '' "$1" 
                            else echo "No unsquashfs available"; fi ;;
                        
			*.tar.gz|*.tgz|*.tar.z|*.tar.dz)
				tar tzvf "$1" --force-local
				;;

*.tar.xz|*.txz)
				if [ -x "`which xz`" ]; then
					xz -dc "$1" | tar tfvv -
				else
					echo "No xz available"
				fi
				;;

*.tar.zst|*.tzst)
				if [ -x "`which zstd`" ]; then
					zstd -qdc "$1" | tar tfvv -
				else
					echo "No zstd available"
				fi
				;;

*.whl)
				if [ -x "`which unzip`" ]; then
					unzip -p "$1" '*.dist-info/METADATA' | sed '/^$/q'
					unzip -v "$1"
				else
		 			echo "No unzip available"
				fi
				;;

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

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

# 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" --force-local
				;;

*.jar|*.war|*.ear|*.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 ;;

*.7z)
				if [ -x "`which 7za`" ]; then 7za l "$1";
                                elif [ -x "`which 7zr`" ]; then 7zr l "$1";
				else echo "No 7za or 7zr 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
				exit 1
			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

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