Chef bash completion script

I've written a short Chef bash completion script to aid me in learning knife commands. Here it is.

# chef bash_completion functions
# place this file in /etc/bash_completion.d/ or run manually after executing /etc/bash_completion


# knife function definitions

_knife ()
{
    local c=1 word
    local numwords=0 cmd="knife"

    while [ $c -le $COMP_CWORD ]; do
        word="${COMP_WORDS[c]}"
        case "$word" in
            --*)
                ;;
            *)
                cmd=$cmd" "$word
                numwords=$((++numwords))
                ;;
        esac
        c=$((++c))
    done

    local opts subcmd
    word="${COMP_WORDS[COMP_CWORD]}"
    case "$word" in
        --*)
            if [ $COMP_CWORD -ge 2 ]; then
                subcmd=${COMP_WORDS[1]}
            fi
            opts=$(_knife_opts "$subcmd")
            if [ "$opts" == "" ]; then
                opts="--help"
            fi
            ;;
        *)
            opts=$(_knife_cmds "$cmd" $((++numwords)))
            case "$opts" in
                BAG)
                    opts=$(knife data bag list)
                    ;;
                CLIENT)
                    opts=$(knife client list)
                    ;;
                COOKBOOK)
                    opts=$(knife cookbook list | awk '{ print $1 }')
                    ;;
                ENVIRONMENT)
                    opts=$(knife environment list)
                    ;;
                FILE)
                    opts=$(ls)
                    ;;
                NODE)
                    opts=$(knife node list)
                    ;;
                ROLE)
                    opts=$(knife role list)
                    ;;
                SERVER_NAME)
                    opts=$(knife cs server list | sed '1d' | awk '{ print $1 }')
                    ;;
                "(options)")
                    opts=""
                    ;;
            esac
            ;;
    esac
    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W "$opts" -- "$word"))
}

_knife_cmds ()
{
    knife --help | grep ^knife | grep "$1" | awk -v col=$2 '{ print $col }' | sort | uniq
}

_knife_opts ()
{
    knife $1 --help | grep -oh -e "--\w* " -e "--\w*-\w*" | sort | uniq
}


# complete statements

complete -o default -F _knife knife

This script is based on somewhat-famous core git bash completion script in that it follows its general outline and methods.

You can download the chef bash completion script by following this link.

If you have any problems with this script or would like me to explain how it works, feel free to post a comment below and I'll follow up with you.