Lazy load all content, keep it off the memory.

fixes #443

libs/Format/Base/SimplePage.php

@@ -4,7 +4,6 @@ abstract class SimplePage implements Page
 {
     protected $title;
     protected $content;
-    protected $generated = null;
 
     public function __construct($title, $content)
     {
@@ -18,11 +17,7 @@ abstract class SimplePage implements Page
 
     public function getContent()
     {
-        if (is_null($this->generated)) {
-            $this->generated = $this->generatePage();
-        }
-
-        return $this->generated;
+        return $this->generatePage();
     }
 
     protected function initializePage($title, $content)

libs/Format/Confluence/Generator.php

@@ -121,10 +121,6 @@ class Generator implements \Todaymade\Daux\Format\Base\Generator
                     'page' => ContentPage::fromFile($node, $params, $contentType),
                 ];
 
-                // As the page is lazily generated
-                // We do it now to fail fast in case of problem
-                $data['page']->getContent();
-
                 if ($key == 'index.html') {
                     $final['title'] = $this->prefix . $tree->getTitle();
                     $final['file'] = $node;

libs/Format/Confluence/Publisher.php

@@ -219,13 +219,13 @@ class Publisher
         }
     }
 
-    protected function shouldUpdate($local, $published)
+    protected function shouldUpdate($local, $local_content, $published)
     {
         if (!array_key_exists('content', $published)) {
             return true;
         }
 
-        $trimmed_local = trim($local->getContent());
+        $trimmed_local = trim($local_content);
         $trimmed_distant = trim($published['content']);
 
         if ($trimmed_local == $trimmed_distant) {
@@ -272,13 +272,14 @@ class Publisher
         $this->run(
             '- ' . $this->niceTitle($entry['file']->getUrl()),
             function () use ($entry, $published, $parent_id) {
-                if ($this->shouldUpdate($entry['page'], $published)) {
+                $generated_content = $entry['page']->getContent();
+                if ($this->shouldUpdate($entry['page'], $generated_content, $published)) {
                     $this->client->updatePage(
                         $parent_id,
                         $published['id'],
                         $published['version'] + 1,
                         $entry['title'],
-                        $entry['page']->getContent()
+                        $generated_content
                     );
                 }
             }

libs/Tree/Content.php

@@ -1,5 +1,6 @@
 <?php namespace Todaymade\Daux\Tree;
 
+use RuntimeException;
 use Webuni\FrontMatter\FrontMatter;
 
 class Content extends ContentAbstract
@@ -19,20 +20,32 @@ class Content extends ContentAbstract
     /** @var bool */
     protected $manuallySetContent = false;
 
+    protected function getFrontMatter()
+    {
+        $content = null;
+        if ($this->manuallySetContent) {
+            $content = $this->content;
+        } else if (!$this->getPath()) {
+            throw new RuntimeException("Empty content");
+        } else {
+            $content = file_get_contents($this->getPath());
+        }
+
+        $frontMatter = new FrontMatter();
+
+        if (substr($content, 0, 3) == "\xef\xbb\xbf") {
+            $content = substr($content, 3);
+        }
+
+        return $frontMatter->parse($content);
+    }
+
     /**
      * @return string
      */
     public function getContent()
     {
-        if (!$this->content && !$this->manuallySetContent) {
-            $this->content = file_get_contents($this->getPath());
-        }
-
-        if ($this->attributes === null) {
-            $this->parseAttributes();
-        }
-
-        return $this->content;
+        return $this->getFrontMatter()->getContent();
     }
 
     /**
@@ -101,17 +114,8 @@ class Content extends ContentAbstract
         // is called in "getContent"
         $this->attributes = [];
 
-        $frontMatter = new FrontMatter();
-
-        $content = $this->getContent();
-        if (substr($content, 0, 3) == "\xef\xbb\xbf") {
-            $content = substr($content, 3);
-        }
-
-        $document = $frontMatter->parse($content);
-
+        $document = $this->getFrontMatter();
         $this->attributes = array_replace_recursive($this->attributes, $document->getData());
-        $this->setContent($document->getContent());
     }
 
     public function setAttributes(array $attributes)