add config file support

README.rst

@@ -91,6 +91,19 @@ Other
 -----
 More to come. Send me a patch or pull request if you can't wait and have written one yourself :-)
 
+Config File
+===========
+``nvchecker`` supports a config file, which contains whatever you would give on commandline every time. This file is at ``~/.nvcheckerrc`` by default, and can be changed by the ``-c`` option. You can specify ``-c /dev/null`` to disable the default config file temporarily.
+
+A typical config file looks like this::
+    --oldver ~/.nvchecker/versionlist.txt --newver ~/.nvchecker/versionlist_new.txt
+
+``~`` and environmental variables will be expanded. Options given on commandline override those in a config file.
+
 Bugs
-----
+====
 * Finish writing results even on Ctrl-C or other interruption.
+
+TODO
+====
+* ``nvtake`` command

nvchecker/config.py

@@ -1,3 +0,0 @@
-# vim:fileencoding=utf-8
-
-

nvchecker/main.py

@@ -95,7 +95,7 @@ def main():
                       help='show desktop notifications when a new version is available')
   util.add_common_arguments(parser)
 
-  args = parser.parse_args()
+  args = util.parse_args(parser)
   if util.process_common_arguments(args):
     return
 

nvchecker/util.py

@@ -1,22 +1,52 @@
+import os
+import sys
 import logging
 
 from .lib import nicelogger
 
 from . import __version__
 
+_DEFAULT_CONFIG = os.path.expanduser('~/.nvcheckerrc')
+
 def add_common_arguments(parser):
   parser.add_argument('-i', '--oldver',
                       help='read an existing version record file')
   parser.add_argument('-o', '--newver',
                       help='write a new version record file')
-  # parser.add_argument('-r', '--rc', default=os.path.expanduser('~/.nvcheckerrc'),
-  #                     help='specify the nvcheckerrc file to use')
+  parser.add_argument('-c', default=_DEFAULT_CONFIG,
+                      help='specify the nvcheckerrc file to use')
   parser.add_argument('-l', '--logging',
                       choices=('debug', 'info', 'warning', 'error'), default='info',
                       help='logging level (default: info)')
   parser.add_argument('-V', '--version', action='store_true',
                       help='show version and exit')
 
+def _get_rcargs():
+  args = sys.argv[1:]
+  args.reverse()
+  it = iter(args)
+
+  try:
+    f = next(it)
+    while True:
+      j = next(it)
+      if j == '-c':
+        break
+      f = j
+  except StopIteration:
+    if os.path.exists(_DEFAULT_CONFIG):
+      f = _DEFAULT_CONFIG
+    else:
+      return []
+
+  return [os.path.expandvars(os.path.expanduser(x))
+          for x in open(f, 'r').read().split()]
+
+def parse_args(parser):
+  args = _get_rcargs()
+  args += sys.argv[1:]
+  return parser.parse_args(args)
+
 def process_common_arguments(args):
   '''return True if should stop'''
   nicelogger.enable_pretty_logging(getattr(logging, args.logging.upper()))