Gemfile that demonstrates a way to use bundler + local, non-version controlled files to enforce local branch checks

Gemfile

# the idea here to rely on .calabash-gem and .briar-gem files
# that are not under version control to set the path and branch.
#
# we want bundler to force local branch checks so calabash and briar
# maintainers are allows aware of what branch they are working from.
#
# non-maintainers can simply use the Gemfile as-is.
#
# maintainers should configure bundler to check that they are working against
# the correct branch.
#
# to dev against briar
# 1. create a .briar-gem file with two lines
#    line 1 - path their github fork
#    line 2 - the target branch - defined locally
#    ex.
#    jmoody/briar
#    0.1.3
#
# 2. configure bundler to use a local override
# $ bundle config local.briar ~/path/to/your/local/briar
#
# to dev against calabash-ios
# 1. create a .calabash-gem file with two lines
#    line 1 - path their github fork
#    line 2 - the target branch - defined locally
#    ex.
#    jmoody/calabash-ios
#    fix/0.9.x-return-key
# 2. configure bundler to use a local override
# $ bundle config local.calabash-cucumber ~/path/to/your/local/calabash
#
# more info here - http://bundler.io/v1.5/git.html
 
# calabash gem
if File.exists?('.calabash-gem')
  branch_info = IO.readlines('.calabash-gem')
  path = branch_info[0].strip
  branch = branch_info[1].strip
  #noinspection GemInspection
  gem 'calabash-cucumber', :github => path, :branch => branch
else
  gem 'calabash-cucumber'
end
 
# briar gem
if File.exists?('.briar-gem')
  branch_info = IO.readlines('.briar-gem')
  path = branch_info[0].strip
  branch = branch_info[1].strip
  #noinspection GemInspection
  gem 'briar', :github => path, :branch => branch
else
  gem 'briar', '0.1.3.rc1'
end