Added support for config files and pluggable kernels

CHANGELOG.md

@@ -11,15 +11,20 @@
   * Support for making unmarkable tasks
   * Added support for task-level properties
   * Added support for simple tasks (tasks with a language suffix and a single block)
+  * Added support for a configuration file
+  * Added support for pluggable kernels
 
 ### Changed
 
   * Modularized the handling of code block implementations.
+  * Reimplemented entire backend execution system using class-based Kernels.
 
 ### Depricated
 
 ### Removed
 
+	* CodeImpl class and all related code is gone (replaced by xp.kernels.base et al.)
+
 ### Fixed
 
   * A simple example analyzing world population (examples/world_pop) (Issue #10)

xp/app.py

@@ -24,6 +24,8 @@
 
 from xp.blocks import registered_code_blocks
 
+from xp.config import config_info, initialize_config_info
+
 logger = logging.getLogger(os.path.basename(__file__))
 
 LOG_LEVELS = ['DEBUG','INFO','WARN','ERROR','CRITICAL']
@@ -235,6 +237,7 @@ def do_run(args):
 def main():
 	parser = argparse.ArgumentParser('xp')
 	parser.add_argument('-l','--log_level',choices=LOG_LEVELS,default='WARN')
+	parser.add_argument('-C','--config_file',default=None,help='specify a configuration file to use')
 	parser.add_argument('command',choices=COMMANDS)
 	parser.add_argument('cmd_args',nargs=argparse.REMAINDER)
 
@@ -244,6 +247,9 @@ def main():
 	log_level = eval('logging.%s' % args.log_level)
 	logging.basicConfig(level=log_level,format='%(levelname)s: %(message)s')
 
+	# load the configuration
+	initialize_config_info(args.config_file)
+
 	# run the command
 	logger.debug('running command: %s' % args.command)
 	try: