ruby-sinatra-contrib binary package in Ubuntu Focal amd64

 sinatra-contrib is a collection of common extensions to the Sinatra web
 framework, semi-officially supported:
  - capture: Lets you capture the content of blocks in templates.
  - config_file: Allows loading configuration from yaml files.
  - content_for: Adds Rails-style content_for helpers to Haml, Erb,
    Erubis and Slim.
  - cookies: A cookies helper for reading and writing cookies.
  - engine_tracking: Adds methods like haml? that allow helper methods
    to check whether they are called from within a template.
  - json: Adds a #json helper method to return JSON documents.
  - link_header: Helpers for generating link HTML tags and
    corresponding Link HTTP headers. Adds link, stylesheet and prefetch helper
    methods.
  - multi_route: Adds ability to define one route block for multiple
    routes and multiple or custom HTTP verbs.
  - namespace: Adds namespace support to Sinatra.
  - respond_with: Choose action and/or template automatically depending
    on the incoming request. Adds helpers respond_to and respond_with.
  - custom_logger: Allows one to define their own logger instance.
  - decompile: Recreates path patterns from Sinatra's internal data
    structures (used by other extensions).
  - reloader: Automatically reloads Ruby files on code changes.
  - extension: Mixin for writing your own Sinatra extensions.
  - test_helpers: Helper methods to ease testing your Sinatra
    application. Partly extracted from Sinatra. Testing framework agnostic.

Source package