Add customizable writers, configs, chain spec in network

cic/cmd/export.py

@@ -22,14 +22,32 @@ def validate_args(args):
     pass
 
 
+def init_writers_from_config(config):
+    w = {
+            'meta': None,
+            'attachment': None,
+            'proof': None,
+        }
+    for v in w.keys():
+        k = 'CIC_CORE_{}_WRITER'.format(v.upper())
+        (d, c) = config.get(k).rsplit('.', maxsplit=1)
+        m = importlib.import_module(d)
+        o = getattr(m, c)
+        w[v] = o
+        
+    return w
+    
+
 def execute(config, eargs):
     modname = 'cic.ext.{}'.format(eargs.target)
     cmd_mod = importlib.import_module(modname)
 
+    writers = init_writers_from_config(config)
+
     ct = Token(path=eargs.directory)
-    cm = Meta(path=eargs.directory)
-    ca = Attachment(path=eargs.directory)
-    cp = Proof(path=eargs.directory, attachments=ca)
+    cm = Meta(path=eargs.directory, writer=writers['meta'])
+    ca = Attachment(path=eargs.directory, writer=writers['attachment'])
+    cp = Proof(path=eargs.directory, attachments=ca, writer=writers['proof'])
     cn = Network(path=eargs.directory)
 
     ct.load()
@@ -38,6 +56,7 @@ def execute(config, eargs):
     ca.load()
     cn.load()
 
-    ref = cn.reference(eargs.target)
+    ref = cn.resource(eargs.target)
+    chain_spec = cn.chain_spec(eargs.target)
     logg.debug('found reference {} for target {}'.format(ref, eargs.target))
-    getattr(cmd_mod, 'new')(ref, cp, signer_hint=eargs.signer)
+    getattr(cmd_mod, 'new')(chain_spec, ref, cp, signer_hint=eargs.signer)

cic/cmd/init.py

@@ -13,7 +13,7 @@ logg = logging.getLogger(__name__)
 
 
 def process_args(argparser):
-    argparser.add_argument('--target', action='append', type=str, help='initialize network specification file with target')
+    argparser.add_argument('--target', action='append', type=str, default=[], help='initialize network specification file with target')
     argparser.add_argument('--name', type=str, help='token name')
     argparser.add_argument('--symbol', type=str, help='token symbol')
     argparser.add_argument('--precision', type=str, help='token unit precision')