Gottwik/Enduro

// * ———————————————————————————————————————————————————————— * //
// *    class helper
// *    render variable name if variable is true
// *    Usage:
// *
// *        {{class 'gradient'}} // will render 'gradient' if class context.gradient is truthy
// *
// *    also takes multiple arguments
// *
// *        {{class 'gradient' 'dark' 'border'}}
// *
// *    Note: converts underscores to dashes
// *
// *        {{class 'gradient_bottom'}} // will render gradient-bottom
// *
// * ———————————————————————————————————————————————————————— * //
const helper = function () {}

helper.prototype.register = function () {
    enduro.templating_engine.registerHelper('class', function () {
        const context = this

        // if no argument is provided renders empty string
        if (arguments.length <= 1) {
            return ''
        }

        return Array.prototype.slice.call(arguments).slice(0, -1) // takes all arguments without the handlebars context
            .reduce(function (prev, next) {
                return context[next]
                    ? prev + ' ' + next // adds argument name if the value is truthy
                    : prev + ''
            }, '')
            .replace(/_/g, '-') // converts underscores to dashes
            .substring(1) // removes first space

    })
}

module.exports = new helper()