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|
require 'sinatra/base'
require 'mustache'
class Mustache
# Support for Mustache in your Sinatra app.
#
# require 'mustache/sinatra'
#
# class Hurl < Sinatra::Base
# register Mustache::Sinatra
#
# set :mustache, {
# # Should be the path to your .mustache template files.
# :templates => "path/to/mustache/templates",
#
# # Should be the path to your .rb Mustache view files.
# :views => "path/to/mustache/views",
#
# # This tells Mustache where to look for the Views module,
# # under which your View classes should live. By default it's
# # the class of your app - in this case `Hurl`. That is, for an :index
# # view Mustache will expect Hurl::Views::Index by default.
# # If our Sinatra::Base subclass was instead Hurl::App,
# # we'd want to do `set :namespace, Hurl::App`
# :namespace => Hurl
# }
#
# get '/stats' do
# mustache :stats
# end
# end
#
# As noted above, Mustache will look for `Hurl::Views::Index` when
# `mustache :index` is called.
#
# If no `Views::Stats` class exists Mustache will render the template
# file directly.
#
# You can indeed use layouts with this library. Where you'd normally
# <%= yield %> you instead {{{yield}}} - the body of the subview is
# set to the `yield` variable and made available to you.
module Sinatra
module Helpers
# Call this in your Sinatra routes.
def mustache(template, options={}, locals={})
# Locals can be passed as options under the :locals key.
locals.update(options.delete(:locals) || {})
# Grab any user-defined settings.
if settings.respond_to?(:mustache)
options = settings.send(:mustache).merge(options)
end
# If they aren't explicitly disabling layouts, try to find
# one.
if options[:layout] != false
# Let the user pass in a layout name.
layout_name = options[:layout]
# If all they said was `true` (or nothing), default to :layout.
layout_name = :layout if layout_name == true || !layout_name
# If they passed a layout name use that.
layout = mustache_class(layout_name, options)
# If it's just an anonymous subclass then don't bother, otherwise
# give us a layout instance.
if layout.name && layout.name.empty?
layout = nil
else
layout = layout.new
end
end
# Find and cache the view class we want. This ensures the
# compiled template is cached, too - no looking up and
# compiling templates on each page load.
klass = mustache_class(template, options)
# Does the view subclass the layout? If so we'll use the
# view to render the layout so you can override layout
# methods in your view - tricky.
view_subclasses_layout = klass < layout.class if layout
# Create a new instance for playing with.
instance = klass.new
# Copy instance variables set in Sinatra to the view
instance_variables.each do |name|
instance.instance_variable_set(name, instance_variable_get(name))
end
# Render with locals.
rendered = instance.render(instance.template, locals)
# Now render the layout with the view we just rendered, if we
# need to.
if layout && view_subclasses_layout
rendered = instance.render(layout.template, :yield => rendered)
elsif layout
rendered = layout.render(layout.template, :yield => rendered)
end
# That's it.
rendered
end
# Returns a View class for a given template name.
def mustache_class(template, options = {})
@template_cache.fetch(:mustache, template) do
compile_mustache(template, options)
end
end
# Given a view name and settings, finds and prepares an
# appropriate view class for this view.
def compile_mustache(view, options = {})
options[:templates] ||= settings.views if settings.respond_to?(:views)
options[:namespace] ||= self.class
unless options[:namespace].to_s.include? 'Views'
options[:namespace] = options[:namespace].const_get(:Views)
end
factory = Class.new(Mustache) do
self.view_namespace = options[:namespace]
self.view_path = options[:views]
end
# If we were handed :"positions.atom" or some such as the
# template name, we need to remember the extension.
if view.to_s.include?('.')
view, ext = view.to_s.split('.')
end
# Try to find the view class for a given view, e.g.
# :view => Hurl::Views::Index.
klass = factory.view_class(view)
klass.view_namespace = options[:namespace]
klass.view_path = options[:views]
# If there is no view class, issue a warning and use the one
# we just generated to cache the compiled template.
if klass == Mustache
warn "No view class found for #{view} in #{factory.view_path}"
klass = factory
# If this is a generic view class make sure we set the
# template name as it was given. That is, an anonymous
# subclass of Mustache won't know how to find the
# "index.mustache" template unless we tell it to.
klass.template_name = view.to_s
elsif ext
# We got an ext (like "atom"), so look for an "Atom" class
# under the current View's namespace.
#
# So if our template was "positions.atom", try to find
# Positions::Atom.
if klass.const_defined?(ext_class = ext.capitalize)
# Found Positions::Atom - set it
klass = klass.const_get(ext_class)
else
# Didn't find Positions::Atom - create it by creating an
# anonymous subclass of Positions and setting that to
# Positions::Atom.
new_class = Class.new(klass)
new_class.template_name = "#{view}.#{ext}"
klass.const_set(ext_class, new_class)
klass = new_class
end
end
# Set the template path and return our class.
klass.template_path = options[:templates] if options[:templates]
klass
end
end
# Called when you `register Mustache::Sinatra` in your Sinatra app.
def self.registered(app)
app.helpers Mustache::Sinatra::Helpers
end
end
end
Sinatra.register Mustache::Sinatra
|
