1 files changed, 83 insertions, 0 deletions
diff --git a/lib/bundler/cli/info.rb b/lib/bundler/cli/info.rb
new file mode 100644
index 0000000000..cd01d4949b
--- /dev/null
+++ b/lib/bundler/cli/info.rb
@@ -0,0 +1,83 @@
+# frozen_string_literal: true
+
+module Bundler
+  class CLI::Info
+    attr_reader :gem_name, :options
+    def initialize(options, gem_name)
+      @options = options
+      @gem_name = gem_name
+    end
+
+    def run
+      Bundler.ui.silence do
+        Bundler.definition.validate_runtime!
+        Bundler.load.lock
+      end
+
+      spec = spec_for_gem(gem_name)
+
+      if spec
+        return print_gem_path(spec) if @options[:path]
+        return print_gem_version(spec) if @options[:version]
+        print_gem_info(spec)
+      end
+    end
+
+    private
+
+    def spec_for_gem(name)
+      Bundler::CLI::Common.select_spec(name, :regex_match)
+    end
+
+    def print_gem_version(spec)
+      Bundler.ui.info spec.version.to_s
+    end
+
+    def print_gem_path(spec)
+      name = spec.name
+      if name == "bundler"
+        path = File.expand_path("../../..", __dir__)
+      else
+        path = spec.full_gem_path
+        if spec.installation_missing?
+          return Bundler.ui.warn "The gem #{name} is missing. It should be installed at #{path}, but was not found"
+        end
+      end
+
+      Bundler.ui.info path
+    end
+
+    def print_gem_info(spec)
+      metadata = spec.metadata
+      name = spec.name
+      gem_info = String.new
+      gem_info << "  * #{name} (#{spec.version}#{spec.git_version})\n"
+      gem_info << "\tSummary: #{spec.summary}\n" if spec.summary
+      gem_info << "\tHomepage: #{spec.homepage}\n" if spec.homepage
+      gem_info << "\tDocumentation: #{metadata["documentation_uri"]}\n" if metadata.key?("documentation_uri")
+      gem_info << "\tSource Code: #{metadata["source_code_uri"]}\n" if metadata.key?("source_code_uri")
+      gem_info << "\tFunding: #{metadata["funding_uri"]}\n" if metadata.key?("funding_uri")
+      gem_info << "\tWiki: #{metadata["wiki_uri"]}\n" if metadata.key?("wiki_uri")
+      gem_info << "\tChangelog: #{metadata["changelog_uri"]}\n" if metadata.key?("changelog_uri")
+      gem_info << "\tBug Tracker: #{metadata["bug_tracker_uri"]}\n" if metadata.key?("bug_tracker_uri")
+      gem_info << "\tMailing List: #{metadata["mailing_list_uri"]}\n" if metadata.key?("mailing_list_uri")
+      gem_info << "\tPath: #{spec.full_gem_path}\n"
+      gem_info << "\tDefault Gem: yes\n" if spec.respond_to?(:default_gem?) && spec.default_gem?
+      gem_info << "\tReverse Dependencies: \n\t\t#{gem_dependencies.join("\n\t\t")}" if gem_dependencies.any?
+
+      if name != "bundler" && spec.installation_missing?
+        return Bundler.ui.warn "The gem #{name} is missing. Gemspec information is still available though:\n#{gem_info}"
+      end
+
+      Bundler.ui.info gem_info
+    end
+
+    def gem_dependencies
+      @gem_dependencies ||= Bundler.definition.specs.filter_map do |spec|
+        dependency = spec.dependencies.find {|dep| dep.name == gem_name }
+        next unless dependency
+        "#{spec.name} (#{spec.version}) depends on #{gem_name} (#{dependency.requirements_list.join(", ")})"
+      end.sort
+    end
+  end
+end