#!/usr/bin/env bash
#
# Lists the contents of archives.
#
# Adapted from a script by Sorin Ionescu <sorin.ionescu@gmail.com>

if (( $# == 0 ))
then
  cat >&2 <<EOF
usage: $0 [-option] [file ...]

options:
    -v, --verbose    verbose archive listing

Report bugs to <sorin.ionescu@gmail.com>.
EOF
fi

if [[ "$1" == "-v" || "$1" == "--verbose" ]]
then
    verbose=0
    shift
fi

while (( $# > 0 ))
do
    if [[ ! -s "$1" ]]
    then
        >&2 echo "$0: file not valid: $1"
        shift
        continue
    fi

    case "${1:l}" in
        *.tar.gz|*.tgz) tar t${verbose:+v}vzf "$1" ;;
        *.tar.bz2|*.tbz|*.tbz2) tar t${verbose:+v}jf "$1" ;;
        *.tar.xz|*.txz) tar --xz --help &> /dev/null \
            && tar --xz -t${verbose:+v}f "$1" \
            || xzcat "$1" | tar t${verbose:+v}f - ;;
        *.tar.zma|*.tlz) tar --lzma --help &> /dev/null \
            && tar --lzma -t${verbose:+v}f "$1" \
            || lzcat "$1" | tar x${verbose:+v}f - ;;
        *.tar) tar t${verbose:+v}f "$1" ;;
        *.zip) unzip -l${verbose:+v} "$1" ;;
        *.rar) unrar &> /dev/null \
            && unrar ${${verbose:+v}:-l} "$1" \
            || rar ${${verbose:+v}:-l} "$1" ;;
        *.7z) 7za l "$1" ;;
        *) >&2 echo "$0: cannot list: $1"
            success=1
            ;;
    esac

    shift
done