usedby

Figure out where your gems are actually being used! Similar to GitHub's "Used By" feature, but for private repos.

This gem installs a command line utility usedby, that outputs a json file with a reverse dependency tree.

This acts more or less like GitHub's "Used By" feature. It currently uses GitHub's code search API which has a few limitations: https://help.github.com/en/github/searching-for-information-on-github/searching-code

gem install usedby

usedby GITHUB_ORGANIZATION [--direct] [--gems GEM1,GEM2,GEM3] [--order gems|projects]

You will be securely prompted for a GitHub Personal Access Token.

For example, running usedby rails --gems railties,rake --order gems produces output like the following:

{
  "railties": {
    "4.0.0.beta": [
      "routing_concerns/Gemfile.lock"
    ],
    "4.0.0": [
      "prototype-rails/Gemfile.lock"
    ]
  },
  "rake": {
    "0.9.2.2": [
      "routing_concerns/Gemfile.lock"
    ],
    "10.1.0": [
      "prototype-rails/Gemfile.lock"
    ]
  }
}

On the other hand, running usedby rails --gems railties,rake --order projects produces output like the following:

{
  "prototype-rails": {
    "railties": "4.0.0.beta",
    "rake": "10.1.0"
  },
  "routing_concerns": {
    "railties": "4.0.0.beta",
    "rake": "0.9.2.2"
  }
}