NBash

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#!/bin/bash
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#
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# Copyright (C) 2013, 2020  Etersoft
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# Copyright (C) 2013, 2020  Vitaly Lipatov <lav@etersoft.ru>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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PROGDIR=$(dirname $0)
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[ "$PROGDIR" = "." ] && PROGDIR=$(pwd)
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# will replaced to /usr/share/erc during install
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SHAREDIR=$(dirname $0)
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load_helper()
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{
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    local CMD="$SHAREDIR/$1"
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    [ -r "$CMD" ] || fatal "Have no $CMD helper file"
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    . $CMD
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}
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load_helper erc-sh-functions
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load_helper erc-sh-archive
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check_tty
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phelp()
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{
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	echo "$Descr
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$Usage
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 Commands:
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$(get_help HELPCMD)
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 Options:
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$(get_help HELPOPT)
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"
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}
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print_version()
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{
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        echo "Etersoft uncompressor version @VERSION@"
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        echo "Copyright (c) Etersoft 2013, 2020, 2023"
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        echo "This program may be freely redistributed under the terms of the GNU AGPLv3."
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}
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regular_unpack()
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{
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    local file="$1"
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    local prg="$2"
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    local pkg="$3"
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    local opt="$4"
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    # instead of epm assure
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    if ! is_command "$prg" ; then
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        epm assure $prg $pkg || fatal "Try install $pkg package for $prg unpack command."
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    fi
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    docmd $prg $opt $file || fatal
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}
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progname="${0##*/}"
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Usage="Usage: $progname [options] file(s)..."
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Descr="ercat - universal file uncompressor"
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quiet=
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cmd=$1
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# Just printout help if run without args
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if [ -z "$cmd" ] ; then
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    print_version
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    echo
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    fatal "Run $ $progname --help for get help"
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fi
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case $cmd in
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    -h|--help|help)       # HELPOPT: this help
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        phelp
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        exit
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        ;;
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    -q|--quiet)           # HELPOPT: be silent
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        quiet=--quiet
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        shift
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        cmd=$1
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        ;;
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    -v|--version)         # HELPOPT: print version
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        print_version
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        exit
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        ;;
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esac
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# TODO: check ext
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# TODO: check file existence
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# TODO: check by content
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for f in $@ ; do
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    TYPE=$(get_archive_ext $f) || TYPE=$(is_plain_text $f) || { warning "Skipping unrecognized $f" ; continue ; }
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    case $TYPE in
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        gz)
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            regular_unpack "$f" gunzip gzip -c
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            ;;
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        bz2)
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            regular_unpack "$f" bzcat bzip2
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            ;;
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        xz)
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            regular_unpack "$f" xzcat xz
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            ;;
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        Z|compress)
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            regular_unpack "$f" zcat gzip
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            ;;
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        lzma)
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            regular_unpack "$f" lzcat xz
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            ;;
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        zst|zstd)
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            regular_unpack "$f" zstdcat zstd
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            ;;
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        lz4)
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            regular_unpack "$f" lz4cat lz4
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            ;;
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        plain)
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            docmd cat "$f" || fatal
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            ;;
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        *)
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            fatal "Unsupported compression format $TYPE"
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            ;;
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    esac
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done
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