1 files changed, 45 insertions, 0 deletions
diff --git a/lib/bundler/cli/platform.rb b/lib/bundler/cli/platform.rb
new file mode 100644
index 0000000000..9fdab0a53c
--- /dev/null
+++ b/lib/bundler/cli/platform.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+module Bundler
+  class CLI::Platform
+    attr_reader :options
+    def initialize(options)
+      @options = options
+    end
+
+    def run
+      platforms, ruby_version = Bundler.ui.silence do
+        locked_ruby_version = Bundler.locked_gems && Bundler.locked_gems.ruby_version
+        gemfile_ruby_version = Bundler.definition.ruby_version && Bundler.definition.ruby_version.single_version_string
+        [Bundler.definition.platforms.map {|p| "* #{p}" },
+         locked_ruby_version || gemfile_ruby_version]
+      end
+      output = []
+
+      if options[:ruby]
+        if ruby_version
+          output << ruby_version
+        else
+          output << "No ruby version specified"
+        end
+      else
+        output << "Your platform is: #{RUBY_PLATFORM}"
+        output << "Your app has gems that work on these platforms:\n#{platforms.join("\n")}"
+
+        if ruby_version
+          output << "Your Gemfile specifies a Ruby version requirement:\n* #{ruby_version}"
+
+          begin
+            Bundler.definition.validate_runtime!
+            output << "Your current platform satisfies the Ruby version requirement."
+          rescue RubyVersionMismatch => e
+            output << e.message
+          end
+        else
+          output << "Your Gemfile does not specify a Ruby version requirement."
+        end
+      end
+
+      Bundler.ui.info output.join("\n\n")
+    end
+  end
+end