Default subcommand is now serve

Using click-default-group: https://github.com/click-contrib/click-default-group

Also removed requirements.txt in favour of setup.py

datasite/app.py

@@ -4,7 +4,6 @@ from sanic.exceptions import NotFound
 from sanic.views import HTTPMethodView
 from sanic_jinja2 import SanicJinja2
 from jinja2 import FileSystemLoader
-import click
 import sqlite3
 from contextlib import contextmanager
 from pathlib import Path

datasite/cli.py

@@ -1,7 +1,9 @@
 import click
+from click_default_group import DefaultGroup
 from .app import app, ensure_build_metadata
 
-@click.group()
+
+@click.group(cls=DefaultGroup, default='serve', default_if_no_args=True)
 def cli():
     """
     Datasite!
@@ -19,6 +21,6 @@ def build():
 @click.option('-p', '--port', default=8001)
 @click.option('--debug', is_flag=True)
 def serve(files, host, port, debug):
-    '''Serve up specified database files with a web UI'''
+    """Serve up specified database files with a web UI"""
     click.echo('Serve! files={} on port {}'.format(files, port))
     app.run(host=host, port=port, debug=debug)

requirements.txt

@@ -1,2 +0,0 @@
-sanic==0.6.0
-sanic-jinja2==0.5.5

setup.py

@@ -8,6 +8,7 @@ setup(
     include_package_data=True,
     install_requires=[
         'click==6.7',
+        'click-default-group==1.2',
         'sanic==0.6.0',
         'sanic-jinja2==0.5.5',
     ],