bol/module/system/helpers.js

export const registerHandlebarsHelpers = function () {

    Handlebars.registerHelper('isNull', function (val) {
        return val == null;
    });

    Handlebars.registerHelper('exists', function (val) {
      return val != null && val != undefined;
    });

    Handlebars.registerHelper('isEmpty', function (list) {
        if (list) return list.length == 0;
        else return 0;
    });

    Handlebars.registerHelper('notEmpty', function (list) {
        return list.length > 0;
    });

    Handlebars.registerHelper('isNegativeOrNull', function (val) {
        return val <= 0;
    });

    Handlebars.registerHelper('isNegative', function (val) {
        return val < 0;
    });

    Handlebars.registerHelper('isPositive', function (val) {
        return val > 0;
    });

    Handlebars.registerHelper('equals', function (val1, val2) {
        return val1 == val2;
    });

    Handlebars.registerHelper('neq', function (val1, val2) {
        return val1 !== val2;
    });

    Handlebars.registerHelper('gt', function (val1, val2) {
        return val1 > val2;
    });

    Handlebars.registerHelper('lt', function (val1, val2) {
        return val1 < val2;
    });

    Handlebars.registerHelper('gte', function (val1, val2) {
        return val1 >= val2;
    });

    Handlebars.registerHelper('lte', function (val1, val2) {
        return val1 <= val2;
    });
    Handlebars.registerHelper('and', function (val1, val2) {
        return val1 && val2;
    });

    Handlebars.registerHelper('or', function (val1, val2) {
        return val1 || val2;
    });

    Handlebars.registerHelper('or3', function (val1, val2, val3) {
        return val1 || val2 || val3;
    });
    
    Handlebars.registerHelper('for', function(from, to, incr, block) {
      var accum = '';
      for(var i = from; i < to; i += incr)
          accum += block.fn(i);
      return accum;
    });
    
    Handlebars.registerHelper('not', function (cond) {
        return !cond;
    });

    Handlebars.registerHelper('count', function (list) {
        return list.length;
    });

    Handlebars.registerHelper('isEnabled', function (configKey) {
        return game.settings.get("bol", configKey);
    });

    Handlebars.registerHelper('split', function (str, separator, keep) {
        return str.split(separator)[keep];
    });

    // If you need to add Handlebars helpers, here are a few useful examples:
    Handlebars.registerHelper('concat', function () {
        var outStr = '';
        for (var arg in arguments) {
            if (typeof arguments[arg] != 'object') {
                outStr += arguments[arg];
            }
        }
        return outStr;
    });

    Handlebars.registerHelper('add', function (a, b) {
        return parseInt(a) + parseInt(b);
    });
  
    Handlebars.registerHelper('sub', function (a, b) {
      return parseInt(a) - parseInt(b);
    });

    Handlebars.registerHelper('valueAtIndex', function (arr, idx) {
        return arr[idx];
    });

    Handlebars.registerHelper('includesKey', function (items, type, key) {
        // console.log(items);
        return items.filter(i => i.type === type).map(i => i.data.key).includes(key);
    });

    Handlebars.registerHelper('includes', function (array, val) {
        return array.includes(val);
    });

    Handlebars.registerHelper('eval', function (expr) {
        return eval(expr);
    });

    


}