libvirt/tools/bash-completion/vsh

#
# virsh & virt-admin completion command
#

_vsh_complete()
{
    local words cword c=0 i=0 cur RO URI CMDLINE INPUT A

    # Here, $COMP_WORDS is an array of words on the bash
    # command line that user wants to complete. However, when
    # parsing command line, the default set of word breaks is
    # applied. This doesn't work for us as it mangles libvirt
    # arguments, e.g. connection URI (with the default set it's
    # split into multiple items within the array). Fortunately,
    # there's a fixup function for the array.
    _get_comp_words_by_ref -n "\"'><=;|&(:" -w words -i cword
    COMP_WORDS=( "${words[@]}" )
    COMP_CWORD=${cword}
    cur=${COMP_WORDS[$COMP_CWORD]}

    # See what URI is user trying to connect to and if they are
    # connecting RO. Honour that.
    while [ $c -le $COMP_CWORD ]; do
        word="${COMP_WORDS[c]}"
        case "$word" in
            -r|--readonly) RO=1 ;;
            -c|--connect) c=$((++c)); URI=${COMP_WORDS[c]} ;;
            *) if [ $c -ne 0 ] && [ $i -eq 0 ]; then i=$c; break; fi ;;
        esac
        c=$((++c))
    done

    CMDLINE=
    if [ -n "${RO}" ]; then
        CMDLINE="${CMDLINE} -r"
    fi
    if [ -n "${URI}" ]; then
        CMDLINE="${CMDLINE} -c ${URI}"
    fi

    INPUT=( "${COMP_WORDS[@]:$i:$COMP_CWORD}" )
    INPUT[-1]=${INPUT[-1]//\\:/:}

    # Uncomment these lines for easy debug.
#    echo;
#    echo "RO=${flag_ro}";
#    echo "URI=${URI}";
#    echo "CMDLINE=${CMDLINE}";
#    echo "INPUT[${#INPUT[@]}]=**${INPUT[@]}**";
#    echo "cur=${cur}";
#    echo;
#    return 0;

    # Small shortcut here. According to manpage:
    # When the function is executed, the first argument ($1) is
    # the name of the command whose arguments are being
    # completed.
    # Therefore, we might just run $1.
    IFS=$'\n' A=($($1 ${CMDLINE} complete -- "${INPUT[@]}" 2>/dev/null))

    COMPREPLY=($(compgen -W "${A[*]%--}" -- ${cur}))
    __ltrim_colon_completions "$cur"
    return 0
} &&
complete -o default -o filenames -F _vsh_complete virsh &&
complete -o default -o filenames -F _vsh_complete virt-admin

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