Create a directory structure for Sinatra using rake task. Not the most robust implementation but works.

sinatra.rake

# ~/.rake is your global rake directory. Rake knows the tasks you write there.
# Create a rake file, say, sinatra.rake

desc "Create a directory structure for Sinatra classic app"
task :create_sinatra do
  sh "mkdir public"
  sh "touch app.rb"
  sh "mkdir public/js"
  sh "mkdir public/css"
  sh "mkdir public/images"
end

# The description is mandatory for global rake tasks.
# And then, "cd" into your app directory and run:

rake -g create_sinatra 

# or

rake --system create_sinatra


# Optionally, you can specify a directory name. The script would be:
# (Hattip: http://itshouldbeuseful.wordpress.com/2011/11/07/passing-parameters-to-a-rake-task/)

desc "Create a directory structure for Sinatra classic app"
task :create_sinatra do
  dir = ARGV.count > 2 ? ARGV.last : "."
  sh "mkdir #{dir}" unless dir == "."
  sh "mkdir #{dir}/public"
  sh "touch #{dir}/app.rb"
  sh "mkdir #{dir}/public/js"
  sh "mkdir #{dir}/public/css"
  sh "mkdir #{dir}/public/images"
end

# and run it with 

rake -g create_sinatra # which creates a dir structure in the current directory

# or

rake -g create_sinatra 'myapp/appfolder' # which will create the structure under 'myapp/appfolder' dir