Colorize Output

This change adds some color to the staging output.  Specifically it highlights
the component names, versions, and download times to make them more apparent
in logs.

Note this is a first attempt and the color scheme may be updated as better
alternatives are found.

Author: nebhale

lib/java_buildpack/buildpack.rb

@@ -25,6 +25,7 @@
 require 'java_buildpack/component/mutable_java_home'
 require 'java_buildpack/component/security_providers'
 require 'java_buildpack/logging/logger_factory'
+require 'java_buildpack/util/colorize'
 require 'java_buildpack/util/configuration_utils'
 require 'java_buildpack/util/constantize'
 require 'java_buildpack/util/snake_case'
@@ -100,7 +101,7 @@ def release
 
     private
 
-    BUILDPACK_MESSAGE = '-----> Java Buildpack Version: %s'.freeze
+    BUILDPACK_MESSAGE = "#{'----->'.red.bold} #{'Java Buildpack'.blue.bold} %s".freeze
 
     LOAD_ROOT = (Pathname.new(__FILE__).dirname + '..').freeze
 

lib/java_buildpack/buildpack_version.rb

@@ -83,15 +83,15 @@ def to_hash
     # @return [String] a +String+ representation of the version
     def to_s(human_readable = true)
       s = []
-      s << @version if @version
-      s << (human_readable ? '(offline)' : 'offline') if @offline
+      s << @version.blue if @version
+      s << (human_readable ? '(offline)'.blue : 'offline') if @offline
 
       if remote_string
         s << '|' if @version && human_readable
         s << remote_string
       end
 
-      s << 'unknown' if s.empty?
+      s << 'unknown'.yellow if s.empty?
       s.join(human_readable ? ' ' : '-')
     end
 

lib/java_buildpack/component/base_component.rb

@@ -16,6 +16,7 @@
 require 'fileutils'
 require 'java_buildpack/component'
 require 'java_buildpack/util/cache/application_cache'
+require 'java_buildpack/util/colorize'
 require 'java_buildpack/util/format_duration'
 require 'java_buildpack/util/shell'
 require 'java_buildpack/util/space_case'
@@ -86,10 +87,10 @@ def release
       # @return [Void]
       def download(version, uri, name = @component_name)
         download_start_time = Time.now
-        print "-----> Downloading #{name} #{version} from #{uri.sanitize_uri} "
+        print "#{'----->'.red.bold} Downloading #{name.blue.bold} #{version.to_s.blue} from #{uri.sanitize_uri} "
 
         JavaBuildpack::Util::Cache::ApplicationCache.new.get(uri) do |file, downloaded|
-          puts downloaded ? "(#{(Time.now - download_start_time).duration})" : '(found in cache)'
+          puts downloaded ? "(#{(Time.now - download_start_time).duration})".green.italic : '(found in cache)'.green.italic
           yield file
         end
       end
@@ -167,7 +168,7 @@ def with_timing(caption)
 
         yield
 
-        puts "(#{(Time.now - start_time).duration})"
+        puts "(#{(Time.now - start_time).duration})".green.italic
       end
 
       private

lib/java_buildpack/util/colorize.rb

@@ -0,0 +1,102 @@
+# Cloud Foundry Java Buildpack
+# Copyright 2013-2017 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+class String
+
+  def bg_black
+    "\e[40m#{self}\e[0m"
+  end
+
+  def bg_blue
+    "\e[44m#{self}\e[0m"
+  end
+
+  def bg_brown
+    "\e[43m#{self}\e[0m"
+  end
+
+  def bg_cyan
+    "\e[46m#{self}\e[0m"
+  end
+
+  def bg_gray
+    "\e[47m#{self}\e[0m"
+  end
+
+  def bg_green
+    "\e[42m#{self}\e[0m"
+  end
+
+  def bg_magenta
+    "\e[45m#{self}\e[0m"
+  end
+
+  def bg_red
+    "\e[41m#{self}\e[0m"
+  end
+
+  def black
+    "\e[30m#{self}\e[0m"
+  end
+
+  def blink
+    "\e[5m#{self}\e[25m"
+  end
+
+  def blue
+    "\e[34m#{self}\e[0m"
+  end
+
+  def bold
+    "\e[1m#{self}\e[22m"
+  end
+
+  def brown
+    "\e[33m#{self}\e[0m"
+  end
+
+  def cyan
+    "\e[36m#{self}\e[0m"
+  end
+
+  def gray
+    "\e[37m#{self}\e[0m"
+  end
+
+  def green
+    "\e[32m#{self}\e[0m"
+  end
+
+  def italic
+    "\e[3m#{self}\e[23m"
+  end
+
+  def magenta
+    "\e[35m#{self}\e[0m"
+  end
+
+  def red
+    "\e[31m#{self}\e[0m"
+  end
+
+  def reverse_color
+    "\e[7m#{self}\e[27m"
+  end
+
+  def underline
+    "\e[4m#{self}\e[24m"
+  end
+
+end