Added navmap feature.

Navmap will allow nested navigation for pages. To 
* add a page to navmap, you've to add `{:navmap? true}` to pages meta.
* define navigation hierarchy you can use directory-structure (first
level will be in /pages/nav1.md, second level will be in
/pages/nav1/nav11.md)
* use navmap, you can 
  * access navmap-pages (sequence of pages) in your template, same as
you've used navbar-pages and
  * access navigation childs as :navmap-children in specific pages (eg.
nav1 will contain a sequence of one page representing nav11).

src/cryogen_core/compiler.clj

@@ -14,7 +14,8 @@
              [get-resource find-assets create-folder create-file-recursive create-file wipe-public-folder
               copy-resources copy-resources-from-theme path]]
             [cryogen-core.sitemap :as sitemap]
-            [cryogen-core.rss :as rss])
+            [cryogen-core.rss :as rss]
+            [clojure.inspector :as inspector])
   (:import java.util.Locale))
 
 (cache-off!)
@@ -216,6 +217,36 @@
          sidebar-pages false} (group-by #(boolean (:navbar? %)) pages)]
     (map (partial sort-by :page-index) [navbar-pages sidebar-pages])))
 
+(defn- uri-level [uri]
+  (count (clojure.string/split uri #"/")))
+
+(defn- filter-pages-for-uri [uri pages]
+  (filter #(clojure.string/starts-with? (:uri %) uri) pages))
+
+(defn build-nav-map-level
+  "builds one level of nav-map and recurs to next level."
+  [parent-uri pages]
+  (let [current-level (+ 1 (uri-level parent-uri))
+        pages-of-parent (filter-pages-for-uri parent-uri pages)
+        pages-on-level (filter #(= current-level (uri-level (:uri %))) pages-of-parent)
+        pages-on-child-level (filter #(< current-level (uri-level (:uri %))) pages-of-parent)        
+        ]
+    (map #(let [page-on-level %
+                child-pages (filter-pages-for-uri (:uri page-on-level) pages-on-child-level)]
+            (if (empty? child-pages)
+              page-on-level  
+              (merge page-on-level
+                     {:navmap-children (build-nav-map-level (:uri page-on-level) child-pages)}))) pages-on-level)
+    ))
+
+(defn build-nav-map
+  "builds a nav-map from pages"
+  [pages]
+  (let [filtered-pages (filter #(boolean (:navmap? %)) pages)
+        sorted-pages (sort-by :uri filtered-pages)]
+     (build-nav-map-level "/pages/" sorted-pages)
+   ))
+
 (defn write-html
   "When `clean-urls?` is set, appends `/index.html` before spit; otherwise just spits."
   [file-uri {:keys [clean-urls?]} data]
@@ -470,6 +501,7 @@
         home-pages (filter #(boolean (:home? %)) pages)
         pages-without-home (filter #(boolean (not (:home? %))) pages)
         [navbar-pages sidebar-pages] (group-pages pages-without-home)
+        navmap-pages (build-nav-map pages-without-home)
         posts-by-tag (group-by-tags posts)
         posts (tag-posts posts config)
         latest-posts (->> posts (take recent-posts) vec)
@@ -480,6 +512,7 @@
                        :tags          (map (partial tag-info config) (keys posts-by-tag))
                        :latest-posts  latest-posts
                        :navbar-pages  navbar-pages
+                       :navmap-pages  navmap-pages
                        :sidebar-pages sidebar-pages
                        :home-page     (if (not-empty home-pages) 
                                         (first home-pages) 
@@ -491,9 +524,12 @@
                        :rss-uri       (path "/" blog-prefix rss-name)
                        :site-url      (if (.endsWith site-url "/") (.substring site-url 0 (dec (count site-url))) site-url)
                        :theme-path    (str "file:resources/templates/themes/" (:theme config))})]
-
-    (println (blue "debug info"))
-    (println "\t-->" (cyan navbar-pages))
+    (when debug?
+      (println (blue "debug: navbar-pages:"))
+      (println "\t-->" (cyan navbar-pages))
+      (println (blue "debug: navmap-pages:"))
+      (println "\t-->" (cyan navmap-pages))
+      )
     (set-custom-resource-path! (:theme-path params))
     (wipe-public-folder keep-files)
     (println (blue "copying theme resources"))

test/cryogen_core/compiler_test.clj

@@ -116,3 +116,36 @@ and more content.
         (reset-resources)
         (copy-and-check-markup-folders dirs mu false))))
   (reset-resources))
+
+
+(defn- page [uri] 
+  {:navmap? true, :uri uri :content uri})
+
+(defn- enhanced-page [uri children] 
+  {:navmap? true, :uri uri :content uri
+   :navmap-children children})
+           
+(deftest test-navmap-pages
+  (testing 
+    "No pages or posts nothing to copy"
+    (let [pages [{:navmap? false, :content "1"} 
+                 (page "/pages/nav1/") 
+                 (page "/pages/nav1/nav11/")
+                 (page "/pages/nav1/nav12/")
+                 (page "/pages/nav1/nav13/")
+                 (page "/pages/nav1/nav11/nav111/")
+                 (page "/pages/nav1/nav11/nav112/")]
+          expected [(enhanced-page 
+                      "/pages/nav1/"
+                      [(enhanced-page 
+                         "/pages/nav1/nav11/"
+                         [(page "/pages/nav1/nav11/nav111/")
+                          (page "/pages/nav1/nav11/nav112/")])
+                       (page "/pages/nav1/nav12/")
+                       (page "/pages/nav1/nav13/")]
+                      )] 
+          ]        
+      (is (= expected
+             (build-nav-map pages)))
+      )
+    ))