use appdirs for the default configuration file

closes #97.

README.rst

@@ -64,7 +64,7 @@ Contents
 Dependency
 ==========
 - Python 3.7+
-- Python library: structlog, toml
+- Python library: structlog, toml, appdirs
 - One of these Python library combinations (ordered by preference):
 
   * tornado + pycurl
@@ -124,7 +124,7 @@ Upgrade from 1.x version
 There are several backward-incompatible changes from the previous 1.x version.
 
 1. Version 2.x requires Python 3.7+ to run.
-2. The command syntax changes a bit. You need to use a ``-c`` switch to specify your software version configuration file.
+2. The command syntax changes a bit. You need to use a ``-c`` switch to specify your software version configuration file (or use the default).
 3. The configuration file format has been changed from ini to `toml`_. You can use the ``nvchecker-ini2toml`` script in this repo to convert your old configuration files. However, comments and formatting will be lost.
 4. Several options have been renamed. ``max_concurrent`` to ``max_concurrency``, and all option names have their ``-`` be replaced with ``_``.
 5. All software configuration tables need a ``source`` option to specify which source is to be used rather than being figured out from option names in use. This enables additional source plugins to be discovered.

nvchecker/core.py

@@ -22,6 +22,7 @@ import json
 
 import structlog
 import toml
+import appdirs
 
 from .lib import nicelogger
 from . import slogconf
@@ -36,8 +37,8 @@ from .ctxvars import tries as ctx_tries
 logger = structlog.get_logger(logger_name=__name__)
 
 def get_default_config() -> str:
-  confdir = os.environ.get('XDG_CONFIG_DIR', os.path.expanduser('~/.config'))
-  file = os.path.join(confdir, 'nvchecker/nvchecker.toml')
+  confdir = appdirs.user_config_dir(appname='nvchecker')
+  file = os.path.join(confdir, 'nvchecker.toml')
   return file
 
 def add_common_arguments(parser: argparse.ArgumentParser) -> None:

setup.py

@@ -21,7 +21,7 @@ setup(
   zip_safe = True,
 
   packages = find_namespace_packages(exclude=['tests', 'build*']),
-  install_requires = ['setuptools', 'toml', 'structlog', 'tornado>=6', 'pycurl'],
+  install_requires = ['setuptools', 'toml', 'structlog', 'appdirs', 'tornado>=6', 'pycurl'],
   extras_require = {
     'vercmp': ['pyalpm'],
   },
@@ -39,7 +39,6 @@ setup(
     ],
   },
   scripts=['scripts/nvchecker-ini2toml'],
-  package_data = {'nvchecker_source': ['vcs.sh']},
 
   classifiers = [
     "Development Status :: 5 - Production/Stable",