1 files changed, 26 insertions, 2 deletions
diff --git a/lib/api/decodePage.js b/lib/api/decodePage.js
index 5cce56c..e0b7d1e 100644
--- a/lib/api/decodePage.js
+++ b/lib/api/decodePage.js
@@ -1,6 +1,7 @@
 
 /**
-    Decode changes from a JS API to a page object
+    Decode changes from a JS API to a page object.
+    Only the content can be edited by plugin's hooks.
 
     @param {Output} output
     @param {Page} page: page instance to edit
@@ -8,7 +9,30 @@
     @return {Page}
 */
 function decodePage(output, page, result) {
-    // todo
+    var originalContent = page.getContent();
+
+    // No returned value
+    // Existing content will be used
+    if (!result) {
+        return page;
+    }
+
+    // GitBook 3
+    // Use returned page.content if different from original content
+    if (result.content != originalContent) {
+        return page.set('content', result.content);
+    }
+
+    // GitBook 2 compatibility
+    // Finally, use page.sections
+    if (result.sections) {
+        return page.set('content',
+            result.sections.map(function(section) {
+                return section.content;
+            }).join('\n')
+        );
+    }
+
     return page;
 }