Added handlebars helpers for navigation, need to find a place where to put them on the page #12

src/renderer/html_handlebars/hbs_navigation_helper.rs

@@ -0,0 +1,83 @@
+extern crate handlebars;
+extern crate rustc_serialize;
+
+use std::path::{PathBuf};
+use std::collections::BTreeMap;
+
+use self::rustc_serialize::json;
+use self::handlebars::{Handlebars, RenderError, RenderContext, Helper, Context};
+
+// Handlebars helper for navigation
+
+pub fn previous(c: &Context, _h: &Helper, _: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
+
+    // get value from context data
+    // rc.get_path() is current json parent path, you should always use it like this
+    // param is the key of value you want to display
+    let chapters = c.navigate(rc.get_path(), "chapters");
+    let current = c.navigate(rc.get_path(), "path").to_string().replace("\"", "");
+    let path_to_root = c.navigate(rc.get_path(), "path_to_root").to_string().replace("\"", "");
+
+    try!(rc.writer.write(path_to_root.as_bytes()));
+
+    // Decode json format
+    let decoded: Vec<BTreeMap<String,String>> = json::decode(&chapters.to_string()).unwrap();
+
+    let mut previous = PathBuf::new();
+
+    for item in decoded {
+
+        if let Some(path) = item.get("path") {
+            previous = if path.len() > 0 {
+
+                if path == &current {
+                    previous.set_extension("html");
+                    try!(rc.writer.write(previous.to_str().unwrap().as_bytes()));
+                    break;
+                }
+
+                PathBuf::from(path)
+
+            } else { previous }
+        }
+    }
+
+    Ok(())
+}
+
+
+
+pub fn next(c: &Context, _h: &Helper, _: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
+
+    // get value from context data
+    // rc.get_path() is current json parent path, you should always use it like this
+    // param is the key of value you want to display
+    let chapters = c.navigate(rc.get_path(), "chapters");
+    let current = c.navigate(rc.get_path(), "path").to_string().replace("\"", "");
+    let path_to_root = c.navigate(rc.get_path(), "path_to_root").to_string().replace("\"", "");
+
+    try!(rc.writer.write(path_to_root.as_bytes()));
+
+    // Decode json format
+    let decoded: Vec<BTreeMap<String,String>> = json::decode(&chapters.to_string()).unwrap();
+
+    let mut is_current = false;
+
+    for item in decoded {
+
+        if let Some(path) = item.get("path") {
+            if path.len() > 0 {
+                if is_current {
+                    let mut next = PathBuf::from(path);
+                    next.set_extension("html");
+                    try!(rc.writer.write(next.to_str().unwrap().as_bytes()));
+                    break;
+                } else if path == &current {
+                    is_current = true;
+                }
+            }
+        }
+    }
+
+    Ok(())
+}

src/renderer/html_handlebars/hbs_toc_helper.rs

@@ -61,7 +61,6 @@ impl HelperDef for RenderToc {
 
                 try!(rc.writer.write("\"".as_bytes()));
 
-                println!("[DEBUG] path: {}\n        current: {}", path, &current);
                 if path == &current {
                     try!(rc.writer.write("class=\"active\"".as_bytes()));
                 }

src/renderer/html_handlebars/mod.rs

@@ -3,6 +3,7 @@ extern crate rustc_serialize;
 extern crate pulldown_cmark;
 
 mod hbs_toc_helper;
+mod hbs_navigation_helper;
 use self::hbs_toc_helper::RenderToc;
 
 use renderer::Renderer;
@@ -32,8 +33,10 @@ impl Renderer for HtmlHandlebars {
         // Register template
         try!(handlebars.register_template_string("index", t.to_owned()));
 
-        // Register helper
+        // Register helpers
         handlebars.register_helper("toc", Box::new(RenderToc));
+        handlebars.register_helper("previous", Box::new(hbs_navigation_helper::previous));
+        handlebars.register_helper("next", Box::new(hbs_navigation_helper::next));
 
         let mut data = try!(make_data(book.clone(), config));
 

src/theme/book.css

@@ -126,10 +126,6 @@ pre {
     border-radius: 3px;
 }
 
-.nav-previous-next {
-    margin-top: 60px;
-}
-
 .left {
     float: left;
 }