info.js

'use strict';

var browserslist = require('browserslist');

function capitalize(str) {
    return str.slice(0, 1).toUpperCase() + str.slice(1);
}

var names = {
    ie: 'IE',
    ie_mob: 'IE Mobile',
    ios_saf: 'iOS',
    op_mini: 'Opera Mini',
    op_mob: 'Opera Mobile',
    and_chr: 'Chrome for Android',
    and_ff: 'Firefox for Android',
    and_uc: 'UC for Android'
};

function prefix(name, prefixes, note) {
    var out = '  ' + name;
    if (note) out += ' *';
    out += ': ';
    out += prefixes.map(function (i) {
        return i.replace(/^-(.*)-$/g, '$1');
    }).join(', ');
    out += '\n';
    return out;
}

module.exports = function (prefixes) {
    if (prefixes.browsers.selected.length === 0) {
        return 'No browsers selected';
    }

    var versions = {};
    for (var _iterator = prefixes.browsers.selected, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
        var _ref;

        if (_isArray) {
            if (_i >= _iterator.length) break;
            _ref = _iterator[_i++];
        } else {
            _i = _iterator.next();
            if (_i.done) break;
            _ref = _i.value;
        }

        var browser = _ref;

        var _browser$split = browser.split(' '),
            name = _browser$split[0],
            version = _browser$split[1];

        name = names[name] || capitalize(name);
        if (versions[name]) {
            versions[name].push(version);
        } else {
            versions[name] = [version];
        }
    }

    var out = 'Browsers:\n';
    for (var _browser in versions) {
        var list = versions[_browser];
        list = list.sort(function (a, b) {
            return parseFloat(b) - parseFloat(a);
        });
        out += '  ' + _browser + ': ' + list.join(', ') + '\n';
    }

    var coverage = browserslist.coverage(prefixes.browsers.selected);
    var round = Math.round(coverage * 100) / 100.0;
    out += '\nThese browsers account for ' + round + '% of all users globally\n';

    var atrules = '';
    for (var name in prefixes.add) {
        var data = prefixes.add[name];
        if (name[0] === '@' && data.prefixes) {
            atrules += prefix(name, data.prefixes);
        }
    }
    if (atrules !== '') {
        out += '\nAt-Rules:\n' + atrules;
    }

    var selectors = '';
    for (var _iterator2 = prefixes.add.selectors, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
        var _ref2;

        if (_isArray2) {
            if (_i2 >= _iterator2.length) break;
            _ref2 = _iterator2[_i2++];
        } else {
            _i2 = _iterator2.next();
            if (_i2.done) break;
            _ref2 = _i2.value;
        }

        var selector = _ref2;

        if (selector.prefixes) {
            selectors += prefix(selector.name, selector.prefixes);
        }
    }
    if (selectors !== '') {
        out += '\nSelectors:\n' + selectors;
    }

    var values = '';
    var props = '';
    var hadGrid = false;
    for (var _name in prefixes.add) {
        var _data = prefixes.add[_name];
        if (_name[0] !== '@' && _data.prefixes) {
            var grid = _name.indexOf('grid-') === 0;
            if (grid) hadGrid = true;
            props += prefix(_name, _data.prefixes, grid);
        }

        if (!_data.values) {
            continue;
        }
        for (var _iterator3 = _data.values, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) {
            var _ref3;

            if (_isArray3) {
                if (_i3 >= _iterator3.length) break;
                _ref3 = _iterator3[_i3++];
            } else {
                _i3 = _iterator3.next();
                if (_i3.done) break;
                _ref3 = _i3.value;
            }

            var value = _ref3;

            var _grid = value.name.indexOf('grid') !== -1;
            if (_grid) hadGrid = true;
            var string = prefix(value.name, value.prefixes, _grid);
            if (values.indexOf(string) === -1) {
                values += string;
            }
        }
    }

    if (props !== '') {
        out += '\nProperties:\n' + props;
    }
    if (values !== '') {
        out += '\nValues:\n' + values;
    }
    if (hadGrid) {
        out += '\n* - Prefixes will be added only on grid: true option.\n';
    }

    if (atrules === '' && selectors === '' && props === '' && values === '') {
        out += '\nAwesome! Your browsers don\'t require any vendor prefixes.' + '\nNow you can remove Autoprefixer from build steps.';
    }

    return out;
};