#!/bin/sh -ef
# List and swap to alternatives

if [ -f ./cpt-lib ]; then . ./cpt-lib; else . cpt-lib; fi

case "$1" in --version|--help|-v|-h|'') ;; *)
    [ -w "$CPT_ROOT/" ] || [ "$uid" = 0 ] || {
        as_root "$0" "$@"
        exit $?
    }
esac

case "$1" in
    --help|-h)
        out "usage: ${0##*/} [-] [pkg file]"
        exit 1
        ;;
    --version|-v) version ;;
    -)
        while read -r pkg path; do
            pkg_swap "$pkg" "$path"
        done
        ;;
    '')
        # Go over each alternative and format the file name for listing.
        # (pkg_name>usr>bin>ls)
        set +f; for pkg in "$sys_db/../choices/"*; do
                    printf '%s\n' "${pkg##*/}"
        done | sed 's|>| /|; s|>|/|g; /\*/d'
        ;;
    *) pkg_swap "$@" ;;
esac