Add support for configuration files

Configuration files allow common arguments like --shadowy-level and
--blacklist to be saved and referenced rather being typed out each time.

ArgumentParser has been subclassed to allow more freedom when parsing
configuration files.

README.md

@@ -54,6 +54,16 @@ You may wish to blacklist options that:
 * add Exhaustion
 * you simply don't have a good source for
 
+### Configuration Files
+
+Rather than typing out every argument each time you use the solver, you may provide a file path (prefixed with "@") to the CLI.
+
+This file should contain command-line arguments. The solver will interpret these arguments as if they were typed in place of the file path.
+
+Configuration files are read top-to-bottom. Arguments can be delimited by a single space, broken onto different lines, or any combination thereof.
+
+Any number of configuration files may be provided simultaneously.
+
 ## Caveats
 
 The solver aims to maximize profit margin, rather than sheer profit. This is because it may be more profitable to make many smaller skeletons than one massive skeleton.

bonemarketsolver/__main__.py

@@ -2,12 +2,14 @@ import argparse
 import curses
 
 from .objects.blacklistaction import BlacklistAction
+from .objects.bonemarketargumentparser import BoneMarketArgumentParser
 from .objects.enumaction import EnumAction
 from .solve import *
 
-parser = argparse.ArgumentParser(
+parser = BoneMarketArgumentParser(
         prog='Bone Market Solver',
         description="Devise the optimal skeleton at the Bone Market in Fallen London.",
+        fromfile_prefix_chars="@",
         argument_default=argparse.SUPPRESS,
         )
 

bonemarketsolver/objects/bonemarketargumentparser.py

@@ -0,0 +1,9 @@
+__all__ = ['BoneMarketArgumentParser']
+__author__ = "Jeremy Saklad"
+
+from argparse import ArgumentParser
+
+class BoneMarketArgumentParser(ArgumentParser):
+    """An ArgumentParser with the ability to read files with any number of space-delimited arguments on a line."""
+    def convert_arg_line_to_args(self, arg_line):
+        return arg_line.split()