Kokonfig

Kokonfig is a command line utility that generates multiple versions of files based on ERB templates and data YAML files.

Kokonfig can be used to generate config files for each environment in your application when each config mostly contains the same structure but values depend on the environment. It can also be useful when config files contain several repeated values.

Add this line to your application's Gemfile:

gem 'kokonfig'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install kokonfig

For each set of output files, you need to create an input YAML data file and an ERB template. For each version defined by these two files, Kokonfig will output one file. You just need to put the input files in default directories and run the following command:

kokonfig

The data file must be a YAML file containing a mapping and its root level keys will be the name of each output version. Inner keys will be values that can be used in the ERB template file.

The data file name will define what will be the template file and output file names. Everything before the .yml extension is the base file name. The template file has to be named with that base file name concatenated with the extension .erb. The output files generated will be named with the base file name with each version string before the file extension. The example below will make this clear.

Data files are read from ./config/kokonfig/data and template files directory is at ./config/kokonfig/templates. Output files are created in the current working directory.

Create a data file ./config/kokonfig/data/result.txt.yml:

production:
  country: Australia
  language: english  
development:
  country: Brazil
  language: portuguese

Create a template file ./config/kokonfig/templates/result.txt.erb:

In <%= country %> people speak <%= language %>!

After runnning kokonfig you should see two files in your current working directory named result.production.txt and result.development.txt. The file result.production.txt should contain:

In Australia people speak english!

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/elciok/kokonfig.

The gem is available as open source under the terms of the MIT License.