getargs

getarg.sh

_dogetarg() {
    local _search_key
    local _in_quote
    local _key
    local _val
    local _equals
    local _STATE
    local _lastchar
    local _want_value
    local _multi_args
    local _final_value
    local _final_value_unset

    _multi_args="$2"

    if [ -n "${1#*=}" -a "${1#*=*}" != "${1}" ]; then
        _want_value="${1#*=}"
    fi

    _search_key="${1%=*}"

    CMDLINE=${CMDLINE:-$(getcmdline)}

    _STATE=start

    echo -n "$CMDLINE" | while read -r -N 1 _a && [ -n "$_a" ] || _a="EOF"; do
        if [ $_STATE = start ]; then
            _key=""
            _val=""
            _in_quote=0
            _equals=0
            _STATE=key
            if [ "$_a" = "\"" ]; then
                _in_quote=1
                continue
            fi
        fi

        if [ "$_STATE" = "key" ]; then
            if [ "$_a" = "EOF" ]; then
                if [ "$_search_key" = "$_key" ]; then
                    _final_value_unset=1
                fi

                if [ "$_final_value_unset" = "1" ] && [ -z "$_want_value" ]; then
                    return 0
                fi

                return 1
            fi

            if [ "$_a" = " " ] && [ "$_in_quote" != "1" ]; then
                if [ "$_search_key" = "$_key" ]; then
                    _final_value=""
                    _final_value_unset=1
                fi
                _STATE=start
            elif [ "$_a" = "=" ] && [ "$_equals" != "1" ]; then
                if [ "$_lastchar" = "\"" ] && [ "$_in_quote" != "1" ]; then
                    _key="${_key}\""
                fi
                _equals=1
                _STATE=val
            elif [ "$_a" = "\"" ] && [ "$_in_quote" = "1" ]; then
                _in_quote=0
            else
                _key="${_key}${_a}"
            fi
        elif [ "$_STATE" = "val" ]; then
            if [ "$_a" = "EOF" ]; then
                if [ "$_search_key" = "$_key" ]; then
                    _final_value=${_val%"\""}
                    _final_value_unset=0
                    if [ -n "$_multi_args" ]; then
                        echo "$_final_value"
                        return 0
                    fi
                fi

                if [ -z "$_want_value" ]; then
                    if [ -n "$_final_value" ]; then
                        if [ -z "$_multi_args" ]; then
                            echo "$_final_value"
                        fi
                        return 0
                    fi

                    if [ "$_final_value_unset" = "1" ]; then
                        return 0
                    fi

                    return 1
                fi

                if [ "$_final_value_unset" = "1" ]; then
                    return 1
                fi

                if [ "$_final_value" = "$_want_value" ]; then
                    return 0
                fi

                return 1
            fi

            if [ "$_equals" = "1" ]; then
                _equals=0
                if [ "$_a" = "\"" ]; then
                    if [ "$_in_quote" = "1" ]; then
                        _in_quote=0
                    else
                        _in_quote=1
                    fi
                    continue
                fi
            fi

            if [ "$_a" = " " ] && [ "$_in_quote" != "1" ]; then
                if [ "$_search_key" = "$_key" ]; then
                    _final_value=${_val%"\""}
                    _final_value_unset=0
                    if [ -n "$_multi_args" ]; then
                        echo "$_final_value"
                    fi
                fi
                _STATE=start
            else
                _val="${_val}${_a}"

                if [ "$_a" = "\"" ]; then
                    if [ "$_in_quote" = "1" ]; then
                        _in_quote=0
                    else
                        _in_quote=1
                    fi
                fi
            fi
        fi
        _lastchar="$_a"
    done
}