[rubygems/rubygems] Add --version parameter to bundle info command.

https://github.com/rubygems/rubygems/commit/7d9fdd908d

lib/bundler/cli.rb

@@ -331,6 +331,7 @@ module Bundler
 
     desc "info GEM [OPTIONS]", "Show information for the given gem"
     method_option "path", :type => :boolean, :banner => "Print full path to gem"
+    method_option "version", :type => :boolean, :banner => "Print gem version"
     def info(gem_name)
       require_relative "cli/info"
       Info.new(options, gem_name).run

lib/bundler/cli/info.rb

@@ -18,6 +18,7 @@ module Bundler
 
       if spec
         return print_gem_path(spec) if @options[:path]
+        return print_gem_version(spec) if @options[:version]
         print_gem_info(spec)
       end
     end
@@ -39,6 +40,10 @@ module Bundler
       raise GemNotFound, Bundler::CLI::Common.gem_not_found_message(gem_name, Bundler.definition.dependencies)
     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"

spec/bundler/commands/info_spec.rb

@@ -50,6 +50,11 @@ RSpec.describe "bundle info" do
       expect(out).to eq(root.to_s)
     end
 
+    it "prints gem version if exists in bundle" do
+      bundle "info rails --version"
+      expect(out).to eq("2.3.2")
+    end
+
     it "doesn't claim that bundler has been deleted, even if using a custom path without bundler there" do
       bundle "config set --local path vendor/bundle"
       bundle "install"