Add initial support for color output in the build system

lib/naclports/package.py

 # Copyright (c) 2014 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 
 from naclports.util import Trace, Log, Warn
 from naclports.error import Error
 from naclports import configuration, pkg_info, util
 
@@ skipping 60 matching lines @@
 
   def __hash__(self):
     return hash((self.NAME, self.VERSION, self.config))
 
   def __str__(self):
     return '<Package %s %s %s>' % (self.NAME, self.VERSION, self.config)
 
   def InfoString(self):
     return "'%s' [%s]" % (self.NAME, self.config)
 
+  def LogStatus(self, message, suffix=''):
+    util.LogHeading(message, " '%s' [%s] %s" % (
+        util.Color(self.NAME, 'yellow'),
+        util.Color(self.config, 'blue'),
+        suffix))
+
   def CheckDeps(self, valid_packages):
     for package in self.DEPENDS:
       if package not in valid_packages:
         Log('%s: Invalid dependency: %s' % (self.info, package))
         return False
 
     for package in self.CONFLICTS:
       if package not in valid_packages:
         Log('%s: Invalid conflict: %s' % (self.info, package))
         return False
@@ skipping 15 matching lines @@
 class InstalledPackage(Package):
   extra_keys = EXTRA_KEYS
 
   def __init__(self, info_file):
     super(InstalledPackage, self).__init__(info_file)
     self.config = configuration.Configuration(self.BUILD_ARCH,
                                               self.BUILD_TOOLCHAIN,
                                               self.BUILD_CONFIG == 'debug')
 
   def Uninstall(self):
-    Log("Uninstalling %s" % self.InfoString())
+    self.LogStatus('Uninstalling')
     self.DoUninstall()
 
   def Files(self):
     """Yields the list of files currently installed by this package."""
     with open(self.GetListFile()) as f:
       for line in f:
         yield line.strip()
 
   def DoUninstall(self):
     with util.InstallLock(self.config):
@@ skipping 21 matching lines @@
       continue
     yield InstalledPackage(os.path.join(stamp_root, filename))
 
 
 def CreateInstalledPackage(package_name, config=None):
   stamp_root = util.GetInstallStampRoot(config)
   info_file = os.path.join(stamp_root, package_name + '.info')
   if not os.path.exists(info_file):
     raise Error('package not installed: %s [%s]' % (package_name, config))
   return InstalledPackage(info_file)