4 files changed, 61 insertions, 7 deletions
diff --git a/lib/json/encodePage.js b/lib/json/encodePage.js
index d876c78..be92117 100644
--- a/lib/json/encodePage.js
+++ b/lib/json/encodePage.js
@@ -1,3 +1,5 @@
+var encodeSummaryArticle = require('./encodeSummaryArticle');
+
 /**
     Return a JSON representation of a page
 
@@ -10,7 +12,6 @@ function encodePage(page, summary) {
     var attributes = page.getAttributes();
     var article = summary.getByPath(file.getPath());
 
-
     var result = attributes.toJS();
 
     if (article) {
@@ -18,7 +19,15 @@ function encodePage(page, summary) {
         result.level = article.getLevel();
         result.depth = article.getDepth();
 
-        // todo: next and prev
+        var nextArticle = summary.getNextArticle(article);
+        if (nextArticle) {
+            result.next = encodeSummaryArticle(nextArticle);
+        }
+
+        var prevArticle = summary.getPrevArticle(article);
+        if (prevArticle) {
+            result.previous = encodeSummaryArticle(prevArticle);
+        }
     }
 
     result.content = page.getContent();
diff --git a/lib/json/encodeSummaryArticle.js b/lib/json/encodeSummaryArticle.js
index b3f977a..987e44a 100644
--- a/lib/json/encodeSummaryArticle.js
+++ b/lib/json/encodeSummaryArticle.js
@@ -5,7 +5,14 @@
     @param {SummaryArticle}
     @return {Object}
 */
-function encodeSummaryArticle(article) {
+function encodeSummaryArticle(article, recursive) {
+    var articles = undefined;
+    if (recursive !== false) {
+        articles = article.getArticles()
+            .map(encodeSummaryArticle)
+            .toJS();
+    }
+
     return {
         title: article.getTitle(),
         level: article.getLevel(),
@@ -13,8 +20,7 @@ function encodeSummaryArticle(article) {
         anchor: article.getAnchor(),
         url: article.getUrl(),
         path: article.getPath(),
-        articles: article.getArticles()
-            .map(encodeSummaryArticle).toJS()
+        articles: articles
     };
 }
 
diff --git a/lib/models/summary.js b/lib/models/summary.js
index b04630f..3b46941 100644
--- a/lib/models/summary.js
+++ b/lib/models/summary.js
@@ -1,3 +1,4 @@
+var is = require('is');
 var Immutable = require('immutable');
 
 var error = require('../utils/error');
@@ -88,6 +89,46 @@ Summary.prototype.getFirstArticle = function() {
 };
 
 /**
+    Return next article of an article
+
+    @param {Article} current
+    @return {Article}
+*/
+Summary.prototype.getNextArticle = function(current) {
+    var level = is.string(current)? current : current.getLevel();
+    var wasPrev = false;
+
+    return this.getArticle(function(article) {
+        if (wasPrev) return true;
+
+        wasPrev = article.getLevel() == level;
+        return false;
+    });
+};
+
+/**
+    Return previous article of an article
+
+    @param {Article} current
+    @return {Article}
+*/
+Summary.prototype.getPrevArticle = function(current) {
+    var level = is.string(current)? current : current.getLevel();
+    var prev = undefined;
+
+    this.getArticle(function(article) {
+        if (article.getLevel() == level) {
+            return true;
+        }
+
+        prev = article;
+        return false;
+    });
+
+    return prev;
+};
+
+/**
     Render summary as text
 
     @return {Promise<String>}
diff --git a/lib/output/callPageHook.js b/lib/output/callPageHook.js
index 0582da9..c66cef0 100644
--- a/lib/output/callPageHook.js
+++ b/lib/output/callPageHook.js
@@ -1,8 +1,6 @@
 var Api = require('../api');
 var callHook = require('./callHook');
 
-var Promise = require('../utils/promise');
-
 /**
     Call a hook for a specific page