kjweiji/functions.php

<?php
/**
 * 空笺未寄 — functions.php
 */

// ── 主题设置 ──────────────────────────────────
add_action('after_setup_theme', 'kjweji_setup');
function kjweji_setup() {
    add_theme_support('title-tag');
    add_theme_support('post-thumbnails');
    add_image_size('kjweji-featured', 960, 400, true);
    add_image_size('kjweji-card', 600, 375, true);
    add_theme_support('custom-logo', array(
        'height' => 40,
        'width'  => 160,
        'flex-height' => true,
    ));
    add_theme_support('html5', array(
        'comment-form', 'comment-list', 'gallery', 'caption', 'style', 'script',
    ));
    register_nav_menus(array(
        'primary' => '主导航',
    ));
}

// ── 资源加载 ──────────────────────────────────
add_action('wp_enqueue_scripts', 'kjweji_enqueue_assets');
function kjweji_enqueue_assets() {
    wp_enqueue_style('kjweji-style', get_stylesheet_uri(), array(), '1.0.0');
    // 字体改用系统自带（Google Fonts 在中国大陆不可用）
    wp_enqueue_script('kjweji-lightbox',
        get_template_directory_uri() . '/assets/js/lightbox.js',
        array(), '1.0.0', true);
}

// ── 注册自定义文章类型: tucao（微言） ──────────
add_action('init', 'kjweji_register_tucao');
function kjweji_register_tucao() {
    register_post_type('tucao', array(
        'labels' => array(
            'name'               => '微言',
            'singular_name'      => '微言',
            'add_new'            => '写微言',
            'add_new_item'       => '写一条微言',
            'edit_item'          => '编辑微言',
            'new_item'           => '新微言',
            'view_item'          => '查看微言',
            'search_items'       => '搜索微言',
            'not_found'          => '暂无微言',
            'not_found_in_trash' => '回收站中暂无微言',
        ),
        'public'            => true,
        'has_archive'       => true,
        'rewrite'           => array('slug' => 'tucao'),
        'show_in_rest'      => true,
        'supports'          => array('title', 'editor', 'author', 'thumbnail'),
        'menu_position'     => 25,
        'menu_icon'         => 'dashicons-format-chat',
    ));
}

// ── 摘要取前 2-3 句 ───────────────────────────
// 摘要：取文章内容的前 N 个字符（在句号处截断）
function kjweji_excerpt($max_sentences = 5, $max_chars = 300) {
    $content = get_the_content();
    $content = wp_strip_all_tags($content);
    if (empty($content)) return '';
    // 先按字符截断
    if (mb_strlen($content) > $max_chars) {
        $content = mb_substr($content, 0, $max_chars);
        // 回退到最后一个句号
        $last_period = mb_strrpos($content, '。');
        if ($last_period !== false && $last_period > $max_chars / 2) {
            $content = mb_substr($content, 0, $last_period + 1);
        }
    }
    return esc_html(trim($content));
}

// ── OG 标签 ───────────────────────────────────
add_action('wp_head', 'kjweji_og_tags');
function kjweji_og_tags() {
    if (is_singular()) {
        $title = get_the_title();
        $desc  = kjweji_excerpt(2);
        $url   = get_permalink();
    } else {
        $title = get_bloginfo('name');
        $desc  = get_bloginfo('description');
        $url   = home_url();
    }
    echo '<meta property="og:type" content="' . (is_singular() ? 'article' : 'website') . '" />' . "\n";
    echo '<meta property="og:title" content="' . esc_attr($title) . '" />' . "\n";
    echo '<meta property="og:description" content="' . esc_attr($desc) . '" />' . "\n";
    echo '<meta property="og:url" content="' . esc_url($url) . '" />' . "\n";
    if (is_singular() && has_post_thumbnail()) {
        $img = get_the_post_thumbnail_url(null, 'kjweji-featured');
        echo '<meta property="og:image" content="' . esc_url($img) . '" />' . "\n";
    }
    echo '<meta name="twitter:card" content="summary_large_image" />' . "\n";
}

// ── 首页只显示普通文章（非 tucao） ─────────────
add_action('pre_get_posts', 'kjweji_home_only_posts');
function kjweji_home_only_posts($query) {
    if (!is_admin() && $query->is_main_query() && $query->is_home()) {
        $query->set('post_type', 'post');
    }
}

// 浏览量
function kjweji_get_views() {
    $count = get_post_meta(get_the_ID(), 'post_views', true);
    return $count ? (int) $count : 0;
}

// 禁用 WP emoji 转图片
remove_action('wp_head', 'print_emoji_detection_script', 7);
remove_action('wp_print_styles', 'print_emoji_styles');
remove_action('admin_print_scripts', 'print_emoji_detection_script');
remove_action('admin_print_styles', 'print_emoji_styles');

add_filter('emoji_svg_url', '__return_false');

// 评论表单中文化
add_filter('comment_form_default_fields', function($fields) {
    $fields['author'] = '<p class="comment-form-author"><label for="author">显示名称</label><input id="author" name="author" type="text" size="30" /></p>';
    $fields['email'] = '<p class="comment-form-email"><label for="email">邮箱</label><input id="email" name="email" type="email" size="30" /></p>';
    $fields['url'] = '<p class="comment-form-url"><label for="url">网站</label><input id="url" name="url" type="url" size="30" /></p>';
    $fields['cookies'] = '<p class="comment-form-cookies-consent"><input id="wp-comment-cookies-consent" name="wp-comment-cookies-consent" type="checkbox" value="yes" /><label for="wp-comment-cookies-consent">在此浏览器中保存我的信息</label></p>';
    return $fields;
});

add_action('template_include', function($template) {
    if (get_query_var('post_type') === 'post' && !is_home() && !is_singular()) {
        $t = locate_template('archive.php');
        if ($t) return $t;
    }
    return $template;
});



// 本地头像（团队证件照）
add_filter('get_avatar', function($avatar, $id_or_email, $size, $default, $alt) {
    $uid = 0;
    if (is_numeric($id_or_email)) $uid = (int) $id_or_email;
    elseif (is_object($id_or_email) && isset($id_or_email->user_id)) $uid = (int) $id_or_email->user_id;
    $att_id = get_user_meta($uid, 'custom_avatar', true);
    if ($att_id) {
        $url = wp_get_attachment_image_url($att_id, 'medium');
        if ($url) {
            return '<img src="' . esc_url($url) . '" class="avatar avatar-' . $size . ' photo" width="' . $size . '" height="' . $size . '" alt="" />';
        }
    }
    return $avatar; // fallback
}, 10, 5);

// 激活主题时自动初始化
add_action('after_switch_theme', 'kjweji_setup_pages');
function kjweji_setup_pages() {
    // 创建笺文页
    if (!get_page_by_path('articles')) {
        wp_insert_post([
            'post_title' => '笺文', 'post_name' => 'articles',
            'post_type' => 'page', 'post_status' => 'publish',
            'meta_input' => ['_wp_page_template' => 'page-articles.php'],
        ]);
    }
    // 创建拾影页
    if (!get_page_by_path('photos')) {
        wp_insert_post([
            'post_title' => '拾影', 'post_name' => 'photos',
            'post_type' => 'page', 'post_status' => 'publish',
            'meta_input' => ['_wp_page_template' => 'page-photos.php'],
        ]);
    }
    // 创建导航菜单
    if (!wp_get_nav_menu_object('主导航')) {
        $menu_id = wp_create_nav_menu('主导航');
        foreach ([
            ['首页', '/'],
            ['笺文', '/articles/'],
            ['微言', '/tucao/'],
            ['拾影', '/photos/'],
        ] as $item) {
            wp_update_nav_menu_item($menu_id, 0, [
                'menu-item-title' => $item[0],
                'menu-item-url' => $item[1],
                'menu-item-status' => 'publish',
            ]);
        }
        $locations = get_theme_mod('nav_menu_locations') ?: [];
        $locations['primary'] = $menu_id;
        set_theme_mod('nav_menu_locations', $locations);
    }
    flush_rewrite_rules();
}