Add RSS subscription support

functions.php

@@ -50,6 +50,7 @@ if (version_compare( $GLOBALS['wp_version'], '4.4-alpha', '<' )) {
 function theme_slug_setup() {
 	add_theme_support('title-tag');
 	add_theme_support('post-thumbnails');
+	add_theme_support('automatic-feed-links');
 	load_theme_textdomain('argon', get_template_directory() . '/languages');
 }
 add_action('after_setup_theme','theme_slug_setup');

settings.php

@@ -1529,6 +1529,18 @@ function themeoptions_page(){
 
 					</tr>
 
+					<tr>
+						<th><label><?php _e('显示 RSS 订阅链接', 'argon');?></label></th>
+						<td>
+							<select name="argon_show_rss_link">
+								<?php $argon_show_rss_link = get_option('argon_show_rss_link', 'false'); ?>
+								<option value="false" <?php if ($argon_show_rss_link=='false'){echo 'selected';} ?>><?php _e('隐藏', 'argon');?></option>
+								<option value="true" <?php if ($argon_show_rss_link=='true'){echo 'selected';} ?>><?php _e('显示', 'argon');?></option>
+							</select>
+							<p class="description"><?php _e('在左侧栏博客概览下方显示 RSS 订阅链接', 'argon');?></p>
+						</td>
+					</tr>
+
 					<tr><th class="subtitle"><h2 id="section-announcement"><?php _e('博客公告', 'argon');?></h2></th></tr>
 
 					<tr>
@@ -6879,6 +6891,7 @@ function argon_update_themeoptions(){
 
 		argon_update_option('argon_show_duolingo_streak');
 		argon_update_option('argon_duolingo_username');
+		argon_update_option('argon_show_rss_link');
 
 		delete_option('argon_duolingo_email');
 		delete_transient('argon_duo_login_error');

sidebar.php

@@ -714,6 +714,14 @@ $author_desc = get_option('argon_sidebar_author_description');
 
 							</nav>
 
+							<?php if (get_option('argon_show_rss_link', 'false') == 'true') : ?>
+								<div class="site-rss">
+									<a href="<?php bloginfo('rss2_url'); ?>" target="_blank" class="btn btn-primary btn-sm btn-icon-only rounded-circle" data-toggle="tooltip" data-placement="bottom" title="<?php _e('RSS 订阅', 'argon'); ?>">
+										<i class="fa fa-rss"></i>
+									</a>
+								</div>
+							<?php endif; ?>
+
 							<?php
 
 								/*侧栏作者链接*/

style.css

@@ -17872,4 +17872,24 @@ html.darkmode .argon-hidden-text-background:active {
 	filter: none;
 	-webkit-filter: none;
 	user-select: auto;
-}
+}.site-rss {
+    margin-top: 15px;
+    display: flex;
+    justify-content: center;
+}
+.site-rss a {
+    width: 38px;
+    height: 38px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    color: #fff !important;
+    background: var(--themecolor);
+    border-radius: 50%;
+    box-shadow: 0 4px 6px rgba(50, 50, 93, .11), 0 1px 3px rgba(0, 0, 0, .08);
+    transition: all .15s ease;
+}
+.site-rss a:hover {
+    transform: translateY(-1px);
+    box-shadow: 0 7px 14px rgba(50, 50, 93, .1), 0 3px 6px rgba(0, 0, 0, .08);
+}