show specific gem details with 'bundle info GEM'

3 files changed, 104 insertions, 0 deletions

diff --git a/lib/bundler/cli.rb b/lib/bundler/cli.rb
index f92ecb1c33..06dc5b208b 100644
--- a/lib/bundler/cli.rb
+++ b/lib/bundler/cli.rb
@@ -245,6 +245,14 @@ module Bundler
     # TODO: 2.0 remove `bundle list`
     map %w(list) => "show"
 
+    desc "info GEM [OPTIONS]", "Shows gem information"
+    method_option "path", :type => :boolean,
+                   :banner => "Show gem path"
+    def info(gem_name)
+      require "bundler/cli/info"
+      Info.new(options, gem_name).run
+    end
+
     desc "binstubs GEM [OPTIONS]", "Install the binstubs of the listed gem"
     long_desc <<-D
       Generate binstubs for executables in [GEM]. Binstubs are put into bin,
diff --git a/lib/bundler/cli/info.rb b/lib/bundler/cli/info.rb
new file mode 100644
index 0000000000..54f7593ec7
--- /dev/null
+++ b/lib/bundler/cli/info.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+require "bundler/cli/common"
+
+module Bundler
+  class CLI::Info
+    attr_reader :gem_name, :options, :latest_specs
+    def initialize(options, gem_name)
+      @options = options
+      @gem_name = gem_name
+      @latest_specs = fetch_latest_specs if not options[:path]
+    end
+
+    def run
+      Bundler.ui.silence do
+        Bundler.definition.validate_runtime!
+        Bundler.load.lock
+      end
+
+      spec = Bundler::CLI::Common.select_spec(gem_name, :regex_match)
+      return unless spec
+
+      path = spec.full_gem_path
+      if options[:path]
+        return Bundler.ui.info(path)
+      end
+
+      unless File.directory?(path)
+        Bundler.ui.warn("The gem #{gem_name} has been deleted. It was installed at:")
+      end
+
+      return print_gem_info spec
+    end
+
+    private
+
+    def print_gem_info spec
+      desc = "  * #{spec.name} (#{spec.version}#{spec.git_version})"
+      latest = latest_specs.find {|l| l.name == spec.name }
+      Bundler.ui.info <<-END.gsub(/^ +/, "")
+        #{desc}
+        \tSummary:  #{spec.summary || "No description available."}
+        \tHomepage: #{spec.homepage || "No website available."}
+        \tStatus:   #{outdated?(spec, latest) ? "Outdated - #{spec.version} < #{latest.version}" : "Up to date"}
+      END
+    end
+
+    def fetch_latest_specs
+      definition = Bundler.definition(true)
+      definition.resolve_remotely!
+      definition.specs
+    end
+
+    def outdated?(current, latest)
+      return false unless latest
+      Gem::Version.new(current.version) < Gem::Version.new(latest.version)
+    end
+
+  end
+end
diff --git a/spec/commands/info_spec.rb b/spec/commands/info_spec.rb
new file mode 100644
index 0000000000..6366f7f9ed
--- /dev/null
+++ b/spec/commands/info_spec.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+require "spec_helper"
+
+describe "bunlde info" do
+
+  context "info from specific gem in gemfile" do
+    before :each do
+      install_gemfile <<-G
+        source "file://#{gem_repo1}"
+        gem "rails"
+      G
+    end
+
+    it "should print summary of rake gem" do
+      bundle "info rails"
+
+      expect(out).to include("rails")
+      expect(out).to include("\tSummary:")
+      expect(out).to include("\tHomepage:")
+      expect(out).to include("\tStatus:")
+    end
+
+    it "should print gem path" do
+      bundle "info rails --path"
+      expect(out).to eq(default_bundle_path("gems", "rails-2.3.2").to_s)
+    end
+
+    it "should create a Gemfile.lock if not existing" do
+      FileUtils.rm("Gemfile.lock")
+
+      bundle "info rails"
+
+      expect(bundled_app("Gemfile.lock")).to exist
+    end
+
+  end
+end