fix option handling in acprep

Both the `--local` option and the default to build local if no build
directory exists did not work, because `build_directory()` uses
`self.options.build_dir`, but the default and the `--local` option used
`self.build_dir`.
I changed the code to always use `self.options` for options/flags.
Now `self.options` is set to the default values of OptParser and is
updated when `parse_args` is called in `run`.

After this commit ledger will be built in:
  * The directory specified using `--output=`
  * Else in a subdirectory of `./build` or `~/Products` if one of those
    directories exist and `--local` is not used.
  * Else inside the source tree (default).

acprep

@@ -101,13 +101,6 @@ class CommandLineApp(object):
     log_handler   = None
     boost_major   = "1_50"
 
-    options = {
-        'debug':    False,
-        'verbose':  False,
-        'logfile':  False,
-        'loglevel': False
-    }
-
     def __init__(self):
         "Initialize CommandLineApp."
         # Create the logger
@@ -137,7 +130,8 @@ class CommandLineApp(object):
         op.add_option('', '--loglevel', metavar='LEVEL',
                       type='string', action='store', dest='loglevel',
                       default=False, help='set log level: DEBUG, INFO, WARNING, ERROR, CRITICAL')
-        return
+
+        self.options = op.get_default_values()
 
     def main(self, *args):
         """Main body of your application.
@@ -167,7 +161,7 @@ class CommandLineApp(object):
         Process options and execute callback functions as needed.  This method
         should not need to be overridden, if the main() method is defined."""
         # Process the options supported and given
-        self.options, main_args = self.option_parser.parse_args()
+        self.options, main_args = self.option_parser.parse_args(values=self.options)
 
         if self.options.logfile:
             fh = logging.handlers.RotatingFileHandler(self.options.logfile,
@@ -238,9 +232,7 @@ class PrepareBuild(CommandLineApp):
         self.current_ver     = None
         #self.current_flavor  = 'default'
         self.current_flavor  = 'debug'
-        self.prefix_dir      = None
         self.products_dir    = None
-        self.build_dir       = self.source_dir
         self.configure_args  = []
         self.CXXFLAGS        = []
         self.LDFLAGS         = []
@@ -264,7 +256,7 @@ class PrepareBuild(CommandLineApp):
         products = self.default_products_directory()
         if (exists(products) and isdir(products)) or \
            (exists('build') and isdir('build')):
-            self.build_dir = None
+            self.options.build_dir = None
 
     def __init__(self):
         CommandLineApp.__init__(self)
@@ -272,8 +264,6 @@ class PrepareBuild(CommandLineApp):
 
         self.source_dir = os.getcwd()
 
-        self.initialize()
-
         op = self.option_parser
 
         op.add_option('', '--help', action="callback",
@@ -321,11 +311,16 @@ class PrepareBuild(CommandLineApp):
                       dest="option_products",
                       help='Collect all build products in this directory')
         op.add_option('', '--output', metavar='DIR', action="store",
+                      default=self.source_dir,
                       dest="build_dir", help='Build in the specified directory')
         op.add_option('', '--local', action="callback",
                       callback=self.option_local,
                       help='Build directly within the source tree (default)')
 
+        self.options = op.get_default_values()
+
+        self.initialize()
+
     def main(self, *args):
         if args and args[0] in ['default', 'debug', 'opt', 'gcov', 'gprof']:
             self.current_flavor = args[0]
@@ -740,7 +735,7 @@ class PrepareBuild(CommandLineApp):
 
     def option_local(self, option=None, opt_str=None, value=None, parser=None):
         self.log.debug('Saw option --local')
-        self.build_dir = self.source_dir
+        self.options.build_dir = self.source_dir
 
     def option_help(self, option=None, opt_str=None, value=None, parser=None):
         self.phase_help()
@@ -841,7 +836,7 @@ class PrepareBuild(CommandLineApp):
         try:
             os.chdir(build_dir)
 
-            need_to_config = not isfile('Makefile')
+            need_to_config = not isfile('rules.ninja' if self.options.use_ninja else 'Makefile')
             if need_to_config:
                 self.log.debug('Source => ' + self.source_dir)
                 self.log.debug('Build  => ' + build_dir)
@@ -945,10 +940,10 @@ class PrepareBuild(CommandLineApp):
     #########################################################################
 
     def configure_flavor(self, flavor, reset=True):
-        self.initialize()               # reset everything
-        self.build_dir      = None      # use the build/ tree
+        self.initialize()                  # reset everything
         self.current_flavor = flavor
-        self.prefix_dir     = None
+        self.options.build_dir      = None # use the build/ tree
+        self.options.prefix_dir     = None
 
         if reset and exists(self.build_directory()) and \
            isdir(self.build_directory()):