hexo-theme-icarus/layout/search/insight.ejs

<div class="ins-search">
    <div class="ins-search-mask"></div>
    <div class="ins-search-container">
        <div class="ins-input-wrapper">
            <input type="text" class="ins-search-input" placeholder="<%= __('insight.hint') %>" />
            <span class="ins-close ins-selectable"><i class="fa fa-times-circle"></i></span>
        </div>
        <div class="ins-section-wrapper">
            <div class="ins-section-container"></div>
        </div>
    </div>
</div>
<script>
    (function ($) {
        $main = $('.ins-search');
        $container = $('.ins-section-container');
        $main.parent().remove('.ins-search');
        $('body').append($main);

        $(document).on('click focus', '.search-form-input', function () {
            $main.addClass('show');
            $main.find('.ins-search-input').focus();
        }).on('click', '.ins-search-item', function () {
            location.href=$(this).attr('data-url');
        }).on('click', '.ins-close', function () {
            $main.removeClass('show');
        });

        function section (title) {
            return $('<section>').addClass('ins-section')
                .append($('<header>').addClass('ins-section-header').text(title));
        }

        function searchItem (icon, title, slug, preview, url) {
            return $('<div>').addClass('ins-selectable').addClass('ins-search-item')
                .append($('<header>').append($('<i>').addClass('fa').addClass('fa-' + icon)).append(title)
                    .append(slug ? $('<span>').addClass('ins-slug').text(slug) : null))
                .append(preview ? $('<p>').addClass('ins-search-preview').text(preview) : null)
                .attr('data-url', url);
        }

        function sectionFactory (type, array) {
            var sectionTitle;
            var $searchItems;
            if (array.length == 0) return null;
            switch (type) {
                case 'POSTS':
                case 'PAGES':
                    sectionTitle = type == 'POSTS' ? '<%= __("insight.posts") %>' : '<%= __("insight.pages") %>';
                    $searchItems = array.map(function (item) {
                        // Use config.root instead of permalink to fix url issue
                        return searchItem('file', item.title, null, item.text.slice(0, 150), '<%= config.root %>' + item.path);
                    });
                    break;
                case 'CATEGORIES':
                case 'TAGS':
                    sectionTitle = type == 'CATEGORIES' ? '<%= __("insight.categories") %>' : '<%= __("insight.tags") %>';
                    $searchItems = array.map(function (item) {
                        return searchItem(type == 'CATEGORIES' ? 'folder' : 'tag', item.name, item.slug, null, item.permalink);
                    });
                    break;
                default:
                    return null;
            }
            return section(sectionTitle).append($searchItems);
        }

        function extractToSet (json, key) {
            var values = {};
            var entries = json.pages.concat(json.posts);
            entries.forEach(function (entry) {
                if (entry[key]) {
                    entry[key].forEach(function (value) {
                        values[value.name] = value;
                    });
                }
            });
            var result = [];
            for (var key in values) {
                result.push(values[key]);
            }
            return result;
        }

        function parseKeywords (keywords) {
            return keywords.split(' ').filter(function (keyword) {
                return !!keyword;
            }).map(function (keyword) {
                return keyword.toUpperCase();
            });
        }

        /**
         * Judge if a given post/page/category/tag contains all of the keywords.
         * @param Object            obj     Object to be weighted
         * @param Array<String>     fields  Object's fields to find matches
         */
        function filter (keywords, obj, fields) {
            var result = false;
            var keywordArray = parseKeywords(keywords);
            var containKeywords = keywordArray.filter(function (keyword) {
                var containFields = fields.filter(function (field) {
                    if (!obj.hasOwnProperty(field))
                        return false;
                    if (obj[field].toUpperCase().indexOf(keyword) > -1)
                        return true;
                });
                if (containFields.length > 0)
                    return true;
                return false;
            });
            return containKeywords.length == keywordArray.length;
        }

        function filterFactory (keywords) {
            return {
                POST: function (obj) {
                    return filter(keywords, obj, ['title', 'text']);
                },
                PAGE: function (obj) {
                    return filter(keywords, obj, ['title', 'text']);
                },
                CATEGORY: function (obj) {
                    return filter(keywords, obj, ['name', 'slug']);
                },
                TAG: function (obj) {
                    return filter(keywords, obj, ['name', 'slug']);
                }
            };
        }

        /**
         * Calculate the weight of a matched post/page/category/tag.
         * @param Object            obj     Object to be weighted
         * @param Array<String>     fields  Object's fields to find matches
         * @param Array<Integer>    weights Weight of every field
         */
        function weight (keywords, obj, fields, weights) {
            var value = 0;
            parseKeywords(keywords).forEach(function (keyword) {
                var pattern = new RegExp(keyword, 'img'); // Global, Multi-line, Case-insensitive
                fields.forEach(function (field, index) {
                    if (obj.hasOwnProperty(field)) {
                        var matches = obj[field].match(pattern);
                        value += matches ? matches.length * weights[index] : 0;
                    }
                });
            });
            return value;
        }

        function weightFactory (keywords) {
            return {
                POST: function (obj) {
                    return weight(keywords, obj, ['title', 'text'], [3, 1]);
                },
                PAGE: function (obj) {
                    return weight(keywords, obj, ['title', 'text'], [3, 1]);
                },
                CATEGORY: function (obj) {
                    return weight(keywords, obj, ['name', 'slug'], [1, 1]);
                },
                TAG: function (obj) {
                    return weight(keywords, obj, ['name', 'slug'], [1, 1]);
                }
            };
        }

        function search (json, keywords) {
            var WEIGHTS = weightFactory(keywords);
            var FILTERS = filterFactory(keywords);
            var posts = json.posts;
            var pages = json.pages;
            var tags = extractToSet(json, 'tags');
            var categories = extractToSet(json, 'categories');
            return {
                posts: posts.filter(FILTERS.POST).sort(function (a, b) { return WEIGHTS.POST(b) - WEIGHTS.POST(a); }).slice(0, 5),
                pages: pages.filter(FILTERS.PAGE).sort(function (a, b) { return WEIGHTS.PAGE(b) - WEIGHTS.PAGE(a); }).slice(0, 5),
                categories: categories.filter(FILTERS.CATEGORY).sort(function (a, b) { return WEIGHTS.CATEGORY(b) - WEIGHTS.CATEGORY(a); }).slice(0, 5),
                tags: tags.filter(FILTERS.TAG).sort(function (a, b) { return WEIGHTS.TAG(b) - WEIGHTS.TAG(a); }).slice(0, 5)
            };
        }

        function searchResultToDOM (searchResult) {
            $container.empty();
            for (var key in searchResult) {
                $container.append(sectionFactory(key.toUpperCase(), searchResult[key]));
            }
        }

        $.getJSON('<%- url_for("/content.json")%>', function (json) {
            if (location.hash.trim() == '#ins-search') {
                $main.addClass('show');
            }
            $('.ins-search-input').on('input', function () {
                var keywords = $(this).val();
                searchResultToDOM(search(json, keywords));
            });
            $('.ins-search-input').trigger('input');
        });
    })(jQuery);
</script>