bzip3-rs 1.2.0

Pure-Rust port of the bzip3 compressor (no C FFI)
Documentation 
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#!/bin/sh
# Copyright (C) 2026 The bzip3-rs contributors.
# SPDX-License-Identifier: Apache-2.0
# Licensed under the Apache License, Version 2.0 <https://www.apache.org/licenses/LICENSE-2.0>
# bz3grep: search possibly compressed files for a pattern.
# Written from scratch for bzip3-rs. Mirrors the behavior of the
# bzip2 bzgrep wrapper with .bz2 replaced by .bz3.

PATH="$PATH:/usr/bin:/bin"; export PATH

# Write the plain form of "$1" to stdout.
# Uses bzip3 when the file starts with the BZ3v1 magic.
# Uses cat for all other files.
plain() {
	f="$1"
	if [ "$(head -c 5 -- "$f" 2>/dev/null)" = "BZ3v1" ]; then
		bzip3 -dcfq -- "$f"
	else
		cat -- "$f"
	fi
}

prog=`echo "$0" | sed 's|.*/||'`
case "$prog" in
	*egrep)	grep=${EGREP-egrep}	;;
	*fgrep)	grep=${FGREP-fgrep}	;;
	*)	grep=${GREP-grep}	;;
esac

pat=""
opt=""
while test $# -ne 0; do
	case "$1" in
	-e | -f)
		opt="$opt $1"
		shift
		pat="$1"
		if test "$grep" = grep; then
			grep=egrep
		fi
		;;
	-A | -B)
		opt="$opt $1 $2"
		shift
		;;
	-*)
		opt="$opt $1"
		;;
	*)
		if test -z "$pat"; then
			pat="$1"
		else
			break
		fi
		;;
	esac
	shift
done

if test -z "$pat"; then
	echo "grep through bzip3 files"
	echo "usage: $prog [grep_options] pattern [files]"
	exit 1
fi

list=0
silent=0
op=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`
case "$op" in
	*l*)	list=1
		;;
esac
case "$op" in
	*h*)	silent=1
		;;
esac

if test $# -eq 0; then
	tmp=`mktemp "${TMPDIR:-/tmp}"/bz3grep.XXXXXXXXXX` || exit 1
	cat > "$tmp"
	plain "$tmp" | $grep $opt "$pat"
	r=$?
	rm -f "$tmp"
	exit $r
fi

res=0
for i do
	if test -f "$i"; then
		:
	else
		if test -f "$i.bz3"; then
			i="$i.bz3"
		fi
	fi
	if test $list -eq 1; then
		plain "$i" | $grep $opt "$pat" 2>&1 > /dev/null && echo "$i"
		r=$?
	elif test $# -eq 1 -o $silent -eq 1; then
		plain "$i" | $grep $opt "$pat"
		r=$?
	else
		j=$(echo "$i" | sed 's/\\/&&/g;s/|/\\&/g;s/&/\\&/g')
		j=`printf "%s" "$j" | tr '\n' ' '`
		exec 3>&1
		eval `
			exec 4>&1 >&3 3>&-
			{
				plain "$i" 4>&-
			} | {
				$grep $opt "$pat" 4>&-; echo "r=$?;" >&4
			} | sed "s|^|${j}:|"
		`
	fi
	test "$r" -ne 0 && res="$r"
done
exit $res