Add print cli command

lib/figaro/cli.rb

@@ -16,6 +16,20 @@ def install
       Install.start
     end
 
+    # figaro print <environment>
+
+    desc "print ENVIRONMENT", "Print the specified environment's variables"
+
+    method_option "path",
+      aliases: ["-p"],
+      default: "config/application.yml",
+      desc: "Specify a configuration file path"
+
+    define_method "print" do |environment|
+      require 'figaro/cli/print'
+      Print.run(options.merge(environment: environment))
+    end
+
     # figaro heroku:set
 
     desc "heroku:set", "Send Figaro configuration to Heroku"

lib/figaro/cli/print.rb

@@ -0,0 +1,15 @@
+require "figaro/cli/task"
+
+module Figaro
+  class CLI < Thor
+    class Print < Task
+      def run
+        puts vars
+      end
+
+      def vars
+        configuration.map{ |k,v| %(#{k}=#{v}) }.join("\n")
+      end
+    end
+  end
+end

spec/figaro/cli/print_spec.rb

@@ -0,0 +1,40 @@
+describe 'figaro print <environment>' do
+  before do
+    create_dir("example")
+    cd("example")
+    write_file("config/application.yml", <<-EOF)
+foo: bar
+production:
+  foo: baz
+test:
+  bar: boink
+EOF
+  end
+
+  it 'respects path' do
+    write_file("env.yml", "different: path")
+
+    cmd = 'figaro print production -p env.yml'
+    run_simple cmd
+    expect(output_from(cmd)).to eq("different=path\n")
+  end
+
+  it 'requires the environment to be specified' do
+    cmd = 'figaro print'
+    run_simple cmd
+    expect(output_from(cmd)).to include('figaro print ENVIRONMENT')
+  end
+
+  it 'prints out the production environment' do
+    cmd = 'figaro print production'
+    run_simple cmd
+    expect(output_from(cmd)).to eq("foo=baz\n")
+  end
+
+  it 'prints out the test environment' do
+    cmd = 'figaro print test'
+    run_simple cmd
+
+    expect(output_from(cmd)).to eq("foo=bar\nbar=boink\n")
+  end
+end