diff --git a/facho/cli.py b/facho/cli.py
index 91bc360..5bd3c8a 100644
--- a/facho/cli.py
+++ b/facho/cli.py
@@ -53,10 +53,44 @@ def SendTestSetAsync(private_key, public_key, password, filename, zipfile):
     
     client = dian.DianSignatureClient(private_key, public_key, password=password)
     resp = client.request(dian.SendTestSetAsync(
-        filename, zipfile.read().encode('utf-8')
+        filename, open(zipfile, 'r').read().encode('utf-8')
     ))
     print(resp)
 
+
+@click.command()
+@click.option('--private-key', type=click.Path(exists=True))
+@click.option('--passphrase')
+@click.argument('scriptname', type=click.Path(exists=True), required=True)
+def generate_invoice(private_key, passphrase, scriptname):
+    """
+    imprime xml en pantalla.
+    SCRIPTNAME espera 
+     def invoice() -> form.Invoice
+     def extensions(form.Invoice): -> List[facho.FachoXMLExtension]
+    """
+    import importlib.util
+    
+    spec = importlib.util.spec_from_file_location('invoice', scriptname)
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+
+    import facho.fe.form as form
+    from facho import fe
+
+    invoice = module.invoice()
+    xml = form.DIANInvoiceXML(invoice)
+    
+    extensions = module.extensions(invoice)
+    for extension in extensions:
+        xml.add_extension(extension)
+
+    if private_key:
+        signer = fe.DianXMLExtensionSigner(private_key, passphrase=passphrase)
+        xml.add_extension(signer)
+        xml.attach_extensions()
+    print(str(xml))
+
     
 @click.group()
 def main():
@@ -64,3 +98,4 @@ def main():
 
 main.add_command(consultaResolucionesFacturacion)
 main.add_command(SendTestSetAsync)
+main.add_command(generate_invoice)
diff --git a/facho/facho.py b/facho/facho.py
index 8418459..47026ef 100644
--- a/facho/facho.py
+++ b/facho/facho.py
@@ -6,6 +6,12 @@ from lxml.etree import Element, SubElement, tostring
 import re
 
 
+class FachoXMLExtension:
+
+    def build(self, fachoxml):
+        raise NotImplementedError
+
+    
 class LXMLBuilder:
     """
     extrae la manipulacion de XML
diff --git a/facho/fe/fe.py b/facho/fe/fe.py
index 5300dfd..787c33a 100644
--- a/facho/fe/fe.py
+++ b/facho/fe/fe.py
@@ -1,7 +1,7 @@
 # This file is part of facho.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 
-from ..facho import FachoXML
+from ..facho import FachoXML, FachoXMLExtension
 import xmlsig
 import xades
 from datetime import datetime
@@ -40,7 +40,7 @@ class FeXML(FachoXML):
 
 
 
-class DianXMLExtensionSoftwareSecurityCode:
+class DianXMLExtensionSoftwareSecurityCode(FachoXMLExtension):
     # RESOLUCION 0001: pagina 535
     
     def __init__(self, id_software: str, pin: str, invoice_ident: str):
@@ -56,7 +56,8 @@ class DianXMLExtensionSoftwareSecurityCode:
         return dian_path, m.hexdigest()
 
     
-class DianXMLExtensionSigner:
+class DianXMLExtensionSigner(FachoXMLExtension):
+    # RESOLUCION 0001: pagina 516
     POLICY_ID = 'https://facturaelectronica.dian.gov.co/politicadefirma/v2/politicadefirmav2.pdf'
     POLICY_NAME = 'Dian'
     
diff --git a/setup.py b/setup.py
index 8542879..2482a5f 100644
--- a/setup.py
+++ b/setup.py
@@ -45,6 +45,10 @@ setup(
     license="GNU General Public License v3",
     long_description=readme + '\n\n' + history,
     include_package_data=True,
+    package_data = {
+        # If any package contains *.txt or *.rst files, include them:
+        '': ['*.gc']
+    },
     keywords='facho',
     name='facho',
     packages=find_packages(exclude=("tests",)),