This is a port of the Typesafe Config library to Ruby.

The library provides Ruby support for the HOCON configuration file format.

At present, it supports parsing and modification of existing HOCON/JSON files via the ConfigFactory class and the ConfigValueFactory class, and rendering parsed config objects back to a String (see examples below). It also supports the parsing and modification of HOCON/JSON files via ConfigDocumentFactory.

Note: While the project is production ready, since not all features in the Typesafe library are supported, you may still run into some issues. If you find a problem, feel free to open a github issue.

The implementation is intended to be as close to a line-for-line port as the two languages allow, in hopes of making it fairly easy to port over new changesets from the Java code base over time.

gem install hocon

To use the simple API, for reading config values:

require 'hocon'

conf = Hocon.load("myapp.conf")
puts "Here's a setting: #{conf["foo"]["bar"]["baz"]}"

By default, the simple API will determine the configuration file syntax/format based on the filename extension of the file; .conf will be interpreted as HOCON, .json will be interpreted as strict JSON, and any other extension will cause an error to be raised since the syntax is unknown. If you'd like to use a different file extension, you manually specify the syntax, like this:

require 'hocon'
require 'hocon/config_syntax'

conf = Hocon.load("myapp.blah", {:syntax => Hocon::ConfigSyntax::HOCON})

Supported values for :syntax are: JSON, CONF, and HOCON. (CONF and HOCON are aliases, and both map to the underlying HOCON syntax.)

To use the ConfigDocument API, if you need both read/write capability for modifying settings in a config file, or if you want to retain access to things like comments and line numbers:

require 'hocon/parser/config_document_factory'
require 'hocon/config_value_factory'

# The below 4 variables will all be ConfigDocument instances
doc = Hocon::Parser::ConfigDocumentFactory.parse_file("myapp.conf")
doc2 = doc.set_value("a.b", "[1, 2, 3, 4, 5]")
doc3 = doc.remove_value("a")
doc4 = doc.set_config_value("a.b", Hocon::ConfigValueFactory.from_any_ref([1, 2, 3, 4, 5]))

doc_has_value = doc.has_value?("a") # returns boolean
orig_doc_text = doc.render # returns string

Note that a ConfigDocument is used primarily for simple configuration manipulation while preserving whitespace and comments. As such, it is not powerful as the regular Config API, and will not resolve substitutions.

bundle install --path .bundle
bundle exec rspec spec

This supports many of the same things as the Java library, but there are some notable exceptions. Unsupported features include:

• Non file includes
• Loading resources from the class path or URLs
• Properties files
• Parsing anything other than files and strings
• Duration and size settings
• Java system properties

Maintainers: Joe Pinsonault [email protected], Chris Price [email protected], Kevin Corcoran [email protected]

Tickets: https://tickets.puppetlabs.com/browse/HC