commands: added create ageanda command

Added the crate command with a subcommand to generate an agenda based on
a list of plugins.

wa/commands/create.py

@@ -0,0 +1,82 @@
+import sys
+from collections import OrderedDict
+
+from wa import ComplexCommand, SubCommand, pluginloader
+from wa.framework.target.descriptor import get_target_descriptions
+
+from wa.utils.serializer import yaml
+
+
+class CreateAgendaSubcommand(SubCommand):
+
+    name = 'agenda'
+    description = """
+    Create an agenda with the specified extensions enabled. And parameters set
+    to their default values.
+    """
+
+    def initialize(self, context):
+        self.parser.add_argument('plugins', nargs='+',
+                                 help='Plugins to be added to the agendas')
+        self.parser.add_argument('-i', '--iterations', type=int, default=1,
+                                 help='Sets the number of iterations for all workloads')
+        self.parser.add_argument('-o', '--output', metavar='FILE',
+                                 help='Output file. If not specfied, STDOUT will be used instead.')
+
+    def execute(self, state, args):
+        agenda = OrderedDict()
+        agenda['config'] = OrderedDict(instrumentation=[], result_processors=[])
+        agenda['global'] = OrderedDict(iterations=args.iterations)
+        agenda['workloads'] = []
+        target_desc = None
+
+        targets = {td.name: td for td in get_target_descriptions()}
+
+        for name in args.plugins:
+            if name in targets:
+                if target_desc is not None:
+                    raise ConfigError('Specifying multiple devices: {} and {}'.format(target_desc.name, name))
+                target_desc = targets[name]
+                agenda['config']['device'] = name
+                agenda['config']['device_config'] = target_desc.get_default_config()
+                continue
+                
+            extcls = pluginloader.get_plugin_class(name)
+            config = pluginloader.get_default_config(name)
+
+            if extcls.kind == 'workload':
+                entry = OrderedDict()
+                entry['name'] = extcls.name
+                if name != extcls.name:
+                    entry['label'] = name
+                entry['params'] = config
+                agenda['workloads'].append(entry)
+            else:
+                if extcls.kind == 'instrument':
+                    agenda['config']['instrumentation'].append(name)
+                if extcls.kind == 'result_processor':
+                    agenda['config']['result_processors'].append(name)
+                agenda['config'][name] = config
+
+        if args.output:
+            wfh = open(args.output, 'w')
+        else:
+            wfh = sys.stdout
+        yaml.dump(agenda, wfh, indent=4, default_flow_style=False)
+        if args.output:
+            wfh.close()
+
+
+class CreateCommand(ComplexCommand):
+
+    name = 'create'
+    description = '''
+    Used to create various WA-related objects (see positional arguments list
+    for what objects may be created).\n\nUse "wa create <object> -h" for
+    object-specific arguments.
+    '''
+    subcmd_classes = [
+        #CreateWorkloadSubcommand,
+        #CreatePackageSubcommand,
+        CreateAgendaSubcommand,
+    ]