Give pages starting with a underscore (_) a special treatment

Follow-up to b493ebdb84e0da20e73ee21992ff36868be0008f

content-sample/_meta.md

@@ -0,0 +1,12 @@
+---
+social:
+    - title: Visit us on GitHub
+      url: https://github.com/picocms/Pico
+      icon: octocat
+    - title: Check us out on Twitter
+      url: https://twitter.com/gitpicocms
+      icon: birdy
+    - title: Join us on Freenode IRC Webchat
+      url: https://webchat.freenode.net/?channels=%23picocms
+      icon: chat
+---

content-sample/index.md

@@ -1,16 +1,6 @@
 ---
 Title: Welcome
 Description: Pico is a stupidly simple, blazing fast, flat file CMS.
-social:
-    - title: Visit us on GitHub
-      url: https://github.com/picocms/Pico
-      icon: octocat
-    - title: Check us out on Twitter
-      url: https://twitter.com/gitpicocms
-      icon: birdy
-    - title: Join us on Freenode IRC Webchat
-      url: https://webchat.freenode.net/?channels=%23picocms
-      icon: chat
 ---
 
 ## Welcome to Pico

lib/Pico.php

@@ -344,8 +344,11 @@ class Pico
         // load raw file content
         $this->triggerEvent('onContentLoading', array(&$this->requestFile));
 
-        $notFoundFile = '404' . $this->getConfig('content_ext');
+        if (
-        if (file_exists($this->requestFile) && (basename($this->requestFile) !== $notFoundFile)) {
+            file_exists($this->requestFile)
+            && (basename($this->requestFile) !== '404' . $this->getConfig('content_ext'))
+            && !preg_match('/(?:^|\/)_/', $this->requestFile)
+        ) {
             $this->rawContent = $this->loadFileContent($this->requestFile);
         } else {
             $this->triggerEvent('on404ContentLoading', array(&$this->requestFile));
@@ -1294,6 +1297,7 @@ class Pico
                 'time' => &$meta['time'],
                 'date' => &$meta['date'],
                 'date_formatted' => &$meta['date_formatted'],
+                'hidden' => (bool) preg_match('/(?:^|\/)_/', $id),
                 'raw_content' => &$rawContent,
                 'meta' => &$meta
             );
@@ -1331,6 +1335,10 @@ class Pico
         }
 
         $alphaSortClosure = function ($a, $b) use ($order) {
+            if ($a['hidden'] xor $b['hidden']) {
+                return (!!$a['hidden'] - !!$b['hidden']) * (($order === 'desc') ? -1 : 1);
+            }
+
             $aSortKey = (basename($a['id']) === 'index') ? dirname($a['id']) : $a['id'];
             $bSortKey = (basename($b['id']) === 'index') ? dirname($b['id']) : $b['id'];
 
@@ -1341,8 +1349,12 @@ class Pico
         if ($orderBy === 'date') {
             // sort by date
             uasort($this->pages, function ($a, $b) use ($alphaSortClosure, $order) {
-                if (empty($a['time']) || empty($b['time'])) {
+                if ($a['hidden'] xor $b['hidden']) {
-                    $cmp = (empty($a['time']) - empty($b['time']));
+                    return $alphaSortClosure($a, $b);
+                }
+
+                if (!$a['time'] || !$b['time']) {
+                    $cmp = (!$a['time'] - !$b['time']);
                 } else {
                     $cmp = ($b['time'] - $a['time']);
                 }

themes/default/index.twig

@@ -28,7 +28,7 @@
             </h1>
             <div id="nav" role="region" tabindex="-1">
                 <ul>
-                    {% for page in pages if page.title and not (page.id starts with "_") %}
+                    {% for page in pages if page.title and not page.hidden %}
                         {% set pageDepth = page.id|split('/')|length %}
                         {% if (pageDepth == 2) and (page.id ends with "/index") or (pageDepth == 1) %}
                             <li{% if page.id == current_page.id %} class="active"{% endif %}>
@@ -50,7 +50,7 @@
     <div id="footer">
         <div class="container">
             <div class="social">
-                {% for social in meta.social %}
+                {% for social in pages._meta.meta.social %}
                     <a href="{{ social.url }}" title="{{ social.title }}" role="button">
                         <span class="icon-{{ social.icon }}" aria-hidden="true"></span>
                         <span class="sr-only">{{ social.title }}</span>