Allow automatic TOC

If enabled, it will automatically add the TOC to post, page/subpage. It will check the shortcode first before add it.

config/config.ini.example

@@ -138,12 +138,19 @@ multi.site = "false"
 ; TOC label
 toc.label = "Table of Contents"
 
-; TOC inital state
+; TOC inital state. Option "close and "open"
 toc.state = "close"
 
-; TOC style
+; Load the default style or not. Option "default" and "theme"
 toc.style = "default"
 
+; Automatically add TOC, but first it check if the shortcode available or not
+; Option "true" and "false"
+toc.automatic = "false"
+
+; Automatically insert the TOC in x paragraph
+toc.position = "1"
+
 ; Set the theme here
 views.root = "themes/twentysixteen"
 

system/admin/views/config-widget.html.php

@@ -63,7 +63,7 @@
   <div class="form-group row">
     <label for="toc.label" class="col-sm-2 col-form-label">TOC label</label>
     <div class="col-sm-10">
-      <input type="text" name="-config-toc.label" class="form-control" id="toc.label" value="<?php echo valueMaker(config('toc.label'));?>" placeholder="Table of Contents">
+      <input type="text" name="-config-toc.label" class="form-control" id="toc.label" value="<?php if(is_null(config('toc.label'))) {echo 'Table of Contents ';} else {echo config('toc.label');};?>" placeholder="Table of Contents">
     </div>
   </div>
   <div class="form-group row">
@@ -77,7 +77,7 @@
           </label>
         </div>
         <div class="form-check">
-          <input class="form-check-input" type="radio" name="-config-toc.state" id="toc.state2" value="close" <?php if (config('toc.state') === 'close'):?>checked<?php endif;?>>
+          <input class="form-check-input" type="radio" name="-config-toc.state" id="toc.state2" value="close" <?php if (config('toc.state') === 'close' || is_null(config('toc.state'))):?>checked<?php endif;?>>
           <label class="form-check-label" for="toc.state2">
             Close
           </label>
@@ -90,7 +90,7 @@
     <div class="col-sm-10">
       <div class="col-sm-10">
         <div class="form-check">
-          <input class="form-check-input" type="radio" name="-config-toc.style" id="toc.style1" value="default" <?php if (config('toc.style') === 'default'):?>checked<?php endif;?>>
+          <input class="form-check-input" type="radio" name="-config-toc.style" id="toc.style1" value="default" <?php if (config('toc.style') === 'default' || is_null(config('toc.style'))):?>checked<?php endif;?>>
           <label class="form-check-label" for="toc.style1">
             Default
           </label>
@@ -104,6 +104,32 @@
       </div>
     </div>
   </div>
+  <div class="form-group row">
+    <label class="col-sm-2 col-form-label">Automatic TOC</label>
+    <div class="col-sm-10">
+      <div class="col-sm-10">
+        <div class="form-check">
+          <input class="form-check-input" type="radio" name="-config-toc.automatic" id="toc.automatic1" value="true" <?php if (config('toc.automatic') === 'true'):?>checked<?php endif;?>>
+          <label class="form-check-label" for="toc.automatic1">
+            <?php echo i18n('Enable');?>
+          </label>
+        </div>
+        <div class="form-check">
+          <input class="form-check-input" type="radio" name="-config-toc.automatic" id="toc.automatic2" value="false" <?php if (config('toc.automatic') === 'false' || is_null(config('toc.automatic'))):?>checked<?php endif;?>>
+          <label class="form-check-label" for="toc.automatic2">
+            <?php echo i18n('Disable');?>
+          </label>
+        </div>
+      </div>
+      <small><em>It will check the shortcode first before add the TOC to <code>post</code> or <code>page/subpage</code></em></small>
+    </div>
+  </div>
+  <div class="form-group row">
+    <label for="toc.position" class="col-sm-2 col-form-label">TOC position in x paragraph</label>
+    <div class="col-sm-10">
+      <input type="number" name="-config-toc.position" class="form-control" id="toc.position" value="<?php echo config('toc.position');?>">
+    </div>
+  </div>
   <br>
   <h4><?php echo i18n('Comments');?></h4>
   <hr>

system/includes/functions.php

@@ -518,9 +518,15 @@ function get_posts($posts, $page = 1, $perpage = 0)
 
         // Get the contents and convert it to HTML
         $post->body = MarkdownExtra::defaultTransform(remove_html_comments($content));
+
         $toc = explode('<!--toc-->', $post->body);
         if (isset($toc['1'])) {
-            $post->body = insert_toc($toc['0'], $toc['1'], 'post-' . $post->date);
+            $post->body = insert_toc('post-' . $post->date, $toc['0'], $toc['1']);
+        } else {
+            $auto = config('toc.automatic');
+            if ($auto === 'true') {
+                $post->body = automatic_toc($post->body, 'post-' . $post->date);
+            }
         }
 
         // Convert image tags to figures
@@ -589,7 +595,12 @@ function get_pages($pages, $page = 1, $perpage = 0)
 
         $toc = explode('<!--toc-->', $post->body);
         if (isset($toc['1'])) {
-            $post->body = insert_toc($toc['0'], $toc['1'], 'page-' . $post->slug);
+            $post->body = insert_toc('page-' . $post->slug, $toc['0'], $toc['1']);
+        } else {
+            $auto = config('toc.automatic');
+            if ($auto === 'true') {
+                $post->body = automatic_toc($post->body, 'page-' . $post->slug);
+            }
         }
 
         if (config('views.counter') == 'true') {
@@ -664,7 +675,12 @@ function get_subpages($sub_pages, $page = 1, $perpage = 0)
         
         $toc = explode('<!--toc-->', $post->body);
         if (isset($toc['1'])) { 
-            $post->body = insert_toc($toc['0'], $toc['1'], 'subpage-' . $post->slug);
+            $post->body = insert_toc('subpage-' . $post->slug, $toc['0'], $toc['1']);
+        } else {
+            $auto = config('toc.automatic');
+            if ($auto === 'true') {
+                $post->body = automatic_toc($post->body, 'subpage-' . $post->slug);
+            }
         }
         
         if (config('views.counter') == 'true') {
@@ -946,7 +962,7 @@ function read_category_info($category)
                 
                 $toc = explode('<!--toc-->', $desc->body);
                 if (isset($toc['1'])) {
-                    $desc->body = insert_toc($toc['0'], $toc['1'], 'taxonomy-' . $desc->slug);
+                    $desc->body = insert_toc('taxonomy-' . $desc->slug, $toc['0'], $toc['1']);
                 }
 
                 $desc->description = get_content_tag("d", $content, get_description($desc->body));
@@ -1178,7 +1194,7 @@ function get_author($name)
                 
                 $toc = explode('<!--toc-->', $author->about);
                 if (isset($toc['1'])) { 
-                    $author->about = insert_toc($toc['0'], $toc['1'], 'profile-' . $author->slug);
+                    $author->about = insert_toc('profile-' . $author->slug, $toc['0'], $toc['1']);
                 }
                 
                 $author->body = $author->about;
@@ -1232,7 +1248,7 @@ function get_frontpage()
         $front->body = MarkdownExtra::defaultTransform(remove_html_comments($content));
         $toc = explode('<!--toc-->', $front->body);
         if (isset($toc['1'])) {
-            $front->body = insert_toc($toc['0'], $toc['1'], 'page-front');
+            $front->body = insert_toc('page-front', $toc['0'], $toc['1']);
         }
     } else {
         $front->title = 'Welcome';
@@ -3580,8 +3596,8 @@ function publish_scheduled()
     }
 }
 
-// Prepare toc
-function insert_toc($part_1, $part_2, $id)
+// Insert toc
+function insert_toc($id, $part_1 = null, $part_2 = null)
 {
     $state = config('toc.state');
     if ($state !== 'open') {
@@ -3613,3 +3629,16 @@ function insert_toc($part_1, $part_2, $id)
     $result = $part_1 . '<div class="toc-wrapper" id="toc-wrapper.'. $id .'" style="display:none;" >'. $load . $style .'<details '. $state .'><summary title="'. $label .'"><span class="details">'. $label .'</span></summary><div class="inner"><div class="toc" id="toc.'. $id .'"></div></div></details><script src="'. site_url().'system/resources/js/toc.generator.js"></script></div>' . $part_2;
     return $result;
 }
+
+// Automatically add toc in x paragraph
+function automatic_toc($content, $id)
+{
+    $pos = config('toc.position');
+    $exp = explode('</p>', $content);
+    if (is_null($pos) || $pos > count($exp)){
+        return $content;
+    }
+    array_splice($exp, $pos, 0, insert_toc($id));
+    $content = implode('</p>', $exp);
+    return $content;
+}