argument parser

update.js

argumentParser = arguments => {

    const acceptedUpdateItems = ['gitHub', 'blog', 'portfolio', 'story', 'projects', 'certifications'];
    let error;

    let output = argumentSplitter(arguments);
    let item = output.item;

// initial check to ensure the update item is valid
    if(!~acceptedUpdateItems.indexOf(item)) return `invalid update item [\`${item}\`]\n Use \`/update help\` for a list of available update items.`;

// handle the special case of the story item which only has the storyString as its data
    let storyString = output.storyString ? output.storyString : null;
    let pairsArray = output.pairsArray ? output.pairsArray : null;

    if(pairsArray){

        let flagDataPairs = {};
        pairsArray.forEach( pairString => {

            let splitIndex = pairString.indexOf(' ');

        // fixes the, albeit odd, case where "/project [item] [-invalidFlag]" with no data is passed...
            let flag = ~splitIndex ? pairString.slice(0, splitIndex) : pairString.slice(0);
            let data = pairString.slice(splitIndex+1);

            // if there is an error it is returned from errorScan as a string
            let errorScanOutput = errorScanAndModify(item, flag, data);
            if(typeof errorScanOutput === 'string'){
                error = errorScanOutput;
            }else{
                // if there is no error errorScan returns an object containing the flag and data (in case they were modified)
                let output = errorScanOutput;
                flag = output.flag;
                data = output.data;
            }

            flagDataPairs[flag] = data;
        });

        return error ? error : {item: item, updateData: flagDataPairs }
    }

    return {item: item, updateData: storyString };
};