1 files changed, 35 insertions, 0 deletions
diff --git a/lib/bundler/cli/init.rb b/lib/bundler/cli/init.rb
new file mode 100644
index 0000000000..8ffd1db41a
--- /dev/null
+++ b/lib/bundler/cli/init.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+module Bundler
+  class CLI::Init
+    attr_reader :options
+    def initialize(options)
+      @options = options
+    end
+
+    def run
+      if File.exist?("Gemfile")
+        Bundler.ui.error "Gemfile already exists at #{SharedHelpers.pwd}/Gemfile"
+        exit 1
+      end
+
+      if options[:gemspec]
+        gemspec = File.expand_path(options[:gemspec])
+        unless File.exist?(gemspec)
+          Bundler.ui.error "Gem specification #{gemspec} doesn't exist"
+          exit 1
+        end
+
+        spec = Bundler.load_gemspec_uncached(gemspec)
+
+        puts "Writing new Gemfile to #{SharedHelpers.pwd}/Gemfile"
+        File.open("Gemfile", "wb") do |file|
+          file << "# Generated from #{gemspec}\n"
+          file << spec.to_gemfile
+        end
+      else
+        puts "Writing new Gemfile to #{SharedHelpers.pwd}/Gemfile"
+        FileUtils.cp(File.expand_path("../../templates/Gemfile", __FILE__), "Gemfile")
+      end
+    end
+  end
+end