Add favicon (#149)

* Fix mobile menu

* Link cover page

* Add home link

* Add favicon

This adds a favicon to the book

website/modify_build.rb

@@ -18,6 +18,7 @@ class ModifyBuild
     system("rm -rf #{build_dir}/")
     system("mkdir #{build_dir}/")
     copy_source_to_local_dir_for_modification
+    copy_assets_into_folder
     list_of_files_to_modify.each do |filename|
       modify_file(filename)
     end
@@ -34,6 +35,7 @@ class ModifyBuild
     text = fix_cover_page(text) if is_cover_page?(filename)
     text = add_home_link_to_menu(text)
     text = fix_anchor_hyperlinks_menu(text)
+    text = add_favicon(text)
     File.open(filename, "w") {|file| file.puts text }
   end
 
@@ -52,6 +54,10 @@ class ModifyBuild
     system("cp -R ../book/#{build_dir}/* #{build_dir}")
   end
 
+  def copy_assets_into_folder
+    system("cp -R ./assets/* #{build_dir}")
+  end
+
   def source_website_output_exists?
     File.directory?("../book/#{build_dir}/")
   end
@@ -68,7 +74,7 @@ class ModifyBuild
     doc = build_doc(text)
     elements = [doc.search('.chapterToc'), doc.search('.sectionToc'), doc.search('.subsectionToc')].flatten
     elements.each do |n|
-      chapter_number_or_nothing = n.children[0].text.strip
+      chapter_number_or_nothing = n.children[0].text.strip.to_i
       hyperlink_node = n.children[1]
       next if hyperlink_node.nil?
 
@@ -76,7 +82,7 @@ class ModifyBuild
       n.children[0].remove
       link_text = hyperlink_node.content
       # no chapter number
-      if chapter_number_or_nothing.length == 0
+      if chapter_number_or_nothing == 0
         content = hyperlink_node.to_s
       else
         link_node_content = %Q{
@@ -163,6 +169,48 @@ class ModifyBuild
     doc.to_html
   end
 
+  # By default the menu is not made for mobile devices. This adds mobile
+  # capabilities to the menu
+  def fix_menu(text)
+    doc = build_doc(text)
+    nav = doc.css("nav.TOC")[0]
+    # page has no nav
+    return text unless nav
+
+    menu_items_html = doc.css("nav.TOC > *").to_html
+    nav.add_class("menu")
+    nav_content = %Q{
+      #{menu_mobile_nav}
+      <div class="menu-items">#{menu_items_html}</div>
+    }
+    nav.inner_html = nav_content
+    doc.to_html
+  end
+
+  def menu_mobile_nav
+  %Q{
+    <a href="/" class="logo">
+      The Sourdough Framework
+    </a>
+    <input type="checkbox" id="toggle-menu">
+    <label class="hamb toggle-menu-label" for="toggle-menu"><span class="hamb-line"></span></label>
+  }
+  end
+
+  # The cover page should have some additional content and allow the user to
+  # click the book cover in order to start reading.
+  def fix_cover_page(text)
+    doc = build_doc(text)
+    body = doc.css("body")[0]
+    content = doc.css("body > .titlepage")[0]
+    menu = doc.css("body > .menu")[0]
+    cover = content.css(".center")[0]
+    cover_html = cover.to_html
+    cover.inner_html = "<a href='Thehistoryofsourdough.html'>#{cover_html}</a>"
+    body.inner_html = "#{menu} #{content}"
+    doc.to_html
+  end
+
   # Users are lost and can't easily access the root page of the book. This
   # adds a home menu item.
   def add_home_link_to_menu(text)
@@ -192,6 +240,14 @@ class ModifyBuild
     doc.to_html
   end
 
+  def add_favicon(text)
+    doc = build_doc(text)
+    head = doc.css("head")[0]
+    fav_html = %Q{<link rel="shortcut icon" type="image/x-icon" href="favicon.ico" />}
+    head.inner_html = "#{head.inner_html} #{fav_html}"
+    doc.to_html
+  end
+
   def build_doc(text)
     Nokogiri::HTML(text)
   end