add basic CLI interface

bloomsky_api/bloomsky_api.py

@@ -3,6 +3,8 @@
 from datetime import datetime
 from dateutil import tz
 
+from .exceptions import APIKeyMissing
+
 DEFAULT_API_URL = 'https://thirdpartyapi.appspot.com/api/skydata/'
 
 
@@ -93,6 +95,8 @@ def __init__(self, api_key=None, api_url=None):
         self.api_url = self._get_api_url(api_url)
 
     def request_data(self):
+        if self.api_key is None:
+            raise APIKeyMissing("No API key provided. Set via env var or argument.")
         headers = {'Authorization': self.api_key}
         response = requests.get(self.api_url, headers=headers)
         response.raise_for_status()

bloomsky_api/cli.py

@@ -1,8 +1,18 @@
 import click
+import json
 
-@click.command()
-def cli():
-    click.echo("Hello, World!")
+from .bloomsky_api import BloomSkyAPIClient
+
+@click.command(help='Retrieve data from the BloomSky API and output it as JSON.')
+@click.option('--api-key', envvar='BLOOMSKY_API_KEY',
+        help='BloomSky API key (can be set via env var BLOOMSKY_API_KEY).')
+@click.option('--api-url', help='Override BloomSky API endpoint URL.')
+@click.option('--json-indent', type=int, default=None,
+help='Number of spaces to indent nested JSON levels.')
+def cli(api_key, api_url, json_indent):
+    client = BloomSkyAPIClient(api_key=api_key, api_url=api_url)
+    data = client.get_data()
+    click.echo(json.dumps(data, indent=json_indent))
 
 if __name__ == '__main__':
     cli()