Improve navigation from 1st chapter back to intro

1st chapter’s prev, now links to the intro page

2 files changed, 8 insertions, 2 deletions

diff --git a/lib/parse/navigation.js b/lib/parse/navigation.js
index 52f3028..3140a1a 100644
--- a/lib/parse/navigation.js
+++ b/lib/parse/navigation.js
@@ -23,10 +23,16 @@ function navigation(summary, files) {
     // Mapping of prev/next for a give path
     var mapping = {};
 
+    // Special README nav
+    var README_NAV = {
+        path: 'README.html',
+        title: 'Introdunction',
+    };
+
     // Walk the chapter/article tree and create navigation entires
     _.each(summary.chapters, function(chapter, idx, chapters) {
         var currentChapter = clean(chapter);
-        var prevChapter = (idx-1 < 0) ? null : chapters[idx-1];
+        var prevChapter = (idx-1 < 0) ? README_NAV : chapters[idx-1];
         var nextChapter = (idx+1 >= chapters.length) ? null : chapters[idx+1];
 
         var prev = (!prevChapter || _.isEmpty(prevChapter.articles)) ?
diff --git a/test/navigation.js b/test/navigation.js
index 4ed2c04..9cc5745 100644
--- a/test/navigation.js
+++ b/test/navigation.js
@@ -31,7 +31,7 @@ describe('Summary navigation', function() {
         assert.equal(nav['README.html'].prev, null);
         assert.equal(nav['README.html'].next.path, 'chapter-1/README.html');
 
-        assert.equal(nav['chapter-1/README.html'].prev, null);
+        assert.equal(nav['chapter-1/README.html'].prev.path, 'README.html');
         assert.equal(nav['chapter-1/README.html'].next.path, 'chapter-1/ARTICLE1.html');
 
         assert.equal(nav['chapter-1/ARTICLE1.html'].prev.path, 'chapter-1/README.html');