ruby (rails) app config file

boot.rb

# ...

# CFG {

require 'rails'

CFG_NAME = (->(; d, b) {
  d, b = File.split Dir.pwd
  b == 'app' ? File.basename(d) : b
})[]

CFG_DIR = "#{ Dir.home }/.apps/#{ CFG_NAME }"

require "#{ CFG_DIR }/cfg"

CFG['development']  = CFG[:dev]
CFG['production']   = CFG[:prod]
CFG['test']         = CFG[:test]

CFG[Rails.env][:init][]

# } CFG

boot__only-production.rb

# ...

# CFG {

require 'rails'

# PLEASE USE A CONFIGURATION FILE FOR DEVELOPMENT AS WELL

if Rails.env == 'production'

  CFG_NAME = (->(; d, b) {
    d, b = File.split Dir.pwd
    b == 'app' ? File.basename(d) : b
  })[]

  CFG_DIR = "#{ Dir.home }/.apps/#{ CFG_NAME }"

  require "#{ CFG_DIR }/cfg"

  CFG['development']  = CFG[:dev]
  CFG['production']   = CFG[:prod]
  CFG['test']         = CFG[:test]

  CFG[Rails.env][:init][]

else

  CFG = { dev: {}, test: {}, prod: {} }

end

# } CFG

cfg.rb

CFG = {
  test: {},
  dev: {},
  prod: {
    db_name: '...',
    db_user: '...',
    db_pass: '...',
    init: ->() {
      File.symlink '/path/to/uploads',
        'public/system' unless File.exists? 'public/system'
    },
  }
}

database.yml

development:
  adapter: postgresql
  encoding: utf8
  database: <%= CFG[:dev][:db_name] %>
  pool: 5
  username: <%= CFG[:dev][:db_user] %>
  password: <%= CFG[:dev][:db_pass] %>
  host: <%= CFG[:dev][:db_host] or 'localhost' %>

test:
  adapter: postgresql
  encoding: utf8
  database: <%= CFG[:test][:db_name] %>
  pool: 5
  username: <%= CFG[:test][:db_user] %>
  password: <%= CFG[:test][:db_pass] %>
  host: <%= CFG[:test][:db_host] or 'localhost' %>

production:
  adapter: postgresql
  encoding: utf8
  database: <%= CFG[:prod][:db_name] %>
  pool: 5
  username: <%= CFG[:prod][:db_user] %>
  password: <%= CFG[:prod][:db_pass] %>
  host: <%= CFG[:prod][:db_host] or 'localhost' %>