The following will be a (hopefully often) updated article with tricks to help utilize Bundler to its fullest.
DRY multi-platform gemspecs (2019-06-14)
- Note the
.dupcall after loading the common specification. This is important as Bundler actually loads all (*.gemspec) files and Rubygems caches the results ofevaling aGem::Specification.loadcall. Without the.dupthis means you'll end up modifying the same spec instance for every custom gemspec you want to have.
gemname.gemspec.common
Gem::Specification.new do |gem|
gem.authors = ["Phil Schalm"]
gem.email = ["notmyrealemail@nowhere.com"]
gem.description = "Sample"
gem.summary = "Longer sample"
gem.files = %w[gemname.gemspec gemname-java.gemspec gemname.gemspec.common Gemfile]
# Common dependencies here
end
gemname.gemspec
Gem::Specification.load(File.expand_path("gemname.gemspec.common", __dir__)).dup.tap do |gem|
gem.instance_exec do
self.name = "gemname"
# 'Everything else' specific dependencies here
end
end
gemname-java.gemspec
Gem::Specification.load(File.expand_path("gemname.gemspec.common", __dir__)).dup.tap do |gem|
gem.instance_exec do
self.name = "gemname-java"
# Java specific dependencies here
end
end
Gemfile
source 'https://rubygems.org'
gemspec name: RUBY_PLATFORM == "java" ? "gemname-java" : "gemname"
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