require "kilt"
CONTENT_FOR_BLOCKS = Hash(String, Tuple(String, Proc(String))).new
# content_for is a set of helpers that allows you to capture
# blocks inside views to be rendered later during the request. The most
# common use is to populate different parts of your layout from your view.
#
# The currently supported engines are: ecr and slang.
#
# == Usage
#
# You call +content_for+, generally from a view, to capture a block of markup
# giving it an identifier:
#
# # index.ecr
# <% content_for "some_key" do %>
# ...
# <% end %>
#
# Then, you call +yield_content+ with that identifier, generally from a
# layout, to render the captured block:
#
# # layout.ecr
# <%= yield_content "some_key" %>
#
# == And How Is This Useful?
#
# For example, some of your views might need a few javascript tags and
# stylesheets, but you don't want to force this files in all your pages.
# Then you can put <%= yield_content :scripts_and_styles %> on your
# layout, inside the tag, and each view can call content_for
# setting the appropriate set of tags that should be added to the layout.
macro content_for(key, file = __FILE__)
%proc = ->() {
__kilt_io__ = MemoryIO.new
{{ yield }}
__kilt_io__.to_s
}
CONTENT_FOR_BLOCKS[{{key}}] = Tuple.new {{file}}, %proc
nil
end
macro yield_content(key)
if CONTENT_FOR_BLOCKS.has_key?({{key}})
__caller_filename__ = CONTENT_FOR_BLOCKS[{{key}}][0]
%proc = CONTENT_FOR_BLOCKS[{{key}}][1]
%proc.call if __content_filename__ == __caller_filename__
end
end
macro render(filename, layout)
__content_filename__ = {{filename}}
content = render {{filename}}
render {{layout}}
end
macro render(filename, *args)
Kilt.render({{filename}}, {{*args}})
end
macro return_with(env, status_code = 200, response = "")
{{env}}.response.status_code = {{status_code}}
{{env}}.response.print {{response}}
next
end