Best way to use a ruby gem as a build dependency?

[mhanberg]

Hi!

I am writing my own "personal cli" and am going to host my own tap/formula to make it easy to install.

I am using a ruby gem called bashly to generate the final artifact (a single bash script) and I am unsure on the best way to install the gem as only a build dependency.

I have looked at some examples of using gems in Formula, but most of them are about using brew to install the gem itself.(solargraph for example).

Any examples that I should check out?

Thanks!

[cho-m]

The closest examples I can think of are some Formulae that use a specific bundler like:

• swiftgen

      ENV["GEM_HOME"] = buildpath/"gem_home"
      system "gem", "install", "bundler"
      ENV.prepend_path "PATH", buildpath/"gem_home/bin"

• mailcatcher

      ENV["GEM_HOME"] = buildpath/"gem_home"
      system "gem", "install", "--no-document", resource("bundler").cached_download
      with_env(PATH: "#{buildpath}/gem_home/bin:#{ENV["PATH"]}") do

---

In general, the idea would be to use a directory under buildpath since this is a temporary location where the build will take place.

In above examples, the 1st downloads an unversioned/latest bundler while the 2nd downloads a specific version of bundler (v2.2.25) listed as resource, which would help make builds more reproducible.

[mhanberg]

This worked, thanks!