Added markdown support

very basic functioning model

.gitignore

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+Gemfile.lock

Gemfile

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 gem 'erb'
+gem 'rackup'
+
+gem 'nokogiri'
+gem 'redcarpet'

app.rb

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+
+require 'sinatra'
+require 'erb'
+require 'nokogiri'
+require 'redcarpet'
+
+$root = "/home/pranshu/Documents/proj/perc/test"
+Dir.chdir $root;
+
+class Sidebar
+  FileNode = Struct.new(:type, :name)
+  DirNode = Struct.new(:type, :name, :files)
+
+  def initialize
+    @tree = process_dir "."
+  end
+
+  def show(n=@tree, indent="")
+    if n.type == :dir
+      print indent, n.name, "\n"
+      n.files.each do |r|
+        show r, " " + indent
+      end
+    else
+      print indent, n.name, "\n"
+    end
+  end
+
+  def html
+    builder = Nokogiri::HTML::Builder.new do |doc|
+      def deal_with_dir (doc, dir, path)
+        doc.li {
+          doc.text dir.name
+          doc.ul {
+            dir.files.each do |f|
+              fpath = File.join(path, f.name)
+              if f.type == :dir
+                deal_with_dir doc, f, fpath
+              else
+                doc.a(:href => fpath) {
+                  doc.li { doc.text f.name }
+                }
+              end
+            end
+          }
+        }
+      end
+      doc.div {
+        deal_with_dir doc, @tree, @tree.name
+      }
+    end
+    builder.to_html().split(/\n/)[1..-1].join
+  end
+  
+  private
+
+  def dir_files()
+    # Remove "." and ".." from file list
+    Dir.entries(".").filter {|f| f !~ /^\.\.?$/ }
+  end
+
+  def process_dir(dir)
+    DirNode.new(:dir, dir,
+                Dir.chdir(dir) do
+      dir_files.map do |f|
+        if File.file? f
+          FileNode.new(:file, f)
+        else
+          process_dir f
+        end
+      end
+    end)
+  end
+  
+end
+
+$sidebar = Sidebar.new
+
+
+class Perc < Sinatra::Application
+  set :views, "."
+  set :markdown, :layout_engine => :erb
+  # @sidebar = Sidebar.new
+  
+  get "/" do
+    erb :main
+  end
+
+  get "/*.*" do |path, ext|
+    if ext == "md"
+      md = markdown File.read(path + ".md")
+      
+    else
+      erb path.to_sym
+    end
+  end
+
+  helpers do
+    def tree
+      $sidebar.html
+    end
+  end
+  
+end
+

config.ru

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+require './app'
+run Perc