fix config issues

generator/api.py

@@ -1,7 +1,6 @@
 from datetime import date
 from typing import Iterable
 from urllib.parse import urlencode
-from warnings import warn
 
 import requests
 
@@ -16,7 +15,7 @@ class GithubAPI:
         if token:
             self.s.headers.update({'Authorization': 'token {}'.format(token)})
         else:
-            warn("use Token!", stacklevel=2)  # TODO
+            print("warning: please add a GitHub token_auth to the config file to avoid rate limits!")
         self.s.headers.update({'User-Agent': 'github-changelog-generator'})
 
     def call(self, url, parameters=None):

generator/cli.py

@@ -7,7 +7,7 @@ from shutil import copyfile
 
 import pkg_resources
 
-from generator import generate_changelog
+from generator import generate_changelog, config
 
 
 def parsed_date(s):
@@ -49,11 +49,13 @@ def main():
                        help="output as debian changelog file")
 
     args = parser.parse_args()
-    print(args)
 
     if args.command == "init":
         initfile(args.globally)
     elif args.command == "generate":
+        if config.api_token == "none_found":
+            sys.exit("no config file found\nPlease create one by running\n"
+                     "github-changelog-generator init")
         generate_changelog(args.since, args.output, args.previous_version)
     else:
         raise ValueError("invalid subcommand")

generator/config.py

@@ -9,6 +9,7 @@ class Config:
     config_paths = ["./github-changelog-generator.yaml", "~/.config/github-changelog-generator.yaml"]
 
     def __init__(self):
+        try:
             with open(self.get_config_path(), 'r') as stream:
                 try:
                     config = yaml.safe_load(stream)
@@ -21,12 +22,14 @@ class Config:
                         self.compare_config()
                 except KeyError as e:
                     sys.exit("required option '{}' is missing from the config".format(e.args[0]))
+        except ValueError:
+            self.api_token = "none_found"
 
     def get_config_path(self) -> str:
         for path in self.config_paths:
             if os.path.isfile(path):
                 return path
-        raise Exception("no config file found")  # TODO
+        raise ValueError()
 
     def compare_config(self) -> None:
         used_config = self.__dict__