python: Separate the options parsing stuff. Remove options parsing stuff from

main.py so things are a bit more obvious.

src/python/m5/options.py

@@ -0,0 +1,145 @@
+# Copyright (c) 2005 The Regents of The University of Michigan
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Authors: Nathan Binkert
+
+import optparse
+import sys
+import util
+
+from optparse import *
+
+class nodefault(object): pass
+
+class splitter(object):
+    def __init__(self, split):
+        self.split = split
+    def __call__(self, option, opt_str, value, parser):
+        values = value.split(self.split)
+        dest = getattr(parser.values, option.dest)
+        if dest is None:
+            setattr(parser.values, option.dest, values)
+        else:
+            dest.extend(values)
+
+class OptionParser(object):
+    def __init__(self, *args, **kwargs):
+        kwargs.setdefault('formatter', optparse.TitledHelpFormatter())
+        self._optparse = optparse.OptionParser(*args, **kwargs)
+        self._optparse.disable_interspersed_args()
+
+        self._allopts = {}
+        self._defaults = {}
+        self._options = util.attrdict()
+
+        # current option group
+        self._group = self._optparse
+
+    def set_group(self, *args, **kwargs):
+        '''set the current option group'''
+        if not args and not kwargs:
+            self._group = self._optparse
+        else:
+            self._group = self._optparse.add_option_group(*args, **kwargs)
+
+    def add_option(self, *args, **kwargs):
+        '''add an option to the current option group, or global none set'''
+
+        # if action=split, but allows the option arguments
+        # themselves to be lists separated by the split variable'''
+
+        if kwargs.get('action', None) == 'append' and 'split' in kwargs:
+            split = kwargs.pop('split')
+            kwargs['default'] = []
+            kwargs['type'] = 'string'
+            kwargs['action'] = 'callback'
+            kwargs['callback'] = splitter(split)
+
+        default = kwargs.pop('default', nodefault)
+        option = self._group.add_option(*args, **kwargs)
+        dest = option.dest
+        if dest not in self._allopts:
+            self._allopts[dest] = option
+
+        if default != nodefault:
+            if dest not in self._options:
+                self._options[dest] = default
+
+        return option
+
+    def bool_option(self, name, default, help):
+        '''add a boolean option called --name and --no-name.
+        Display help depending on which is the default'''
+
+        tname = '--%s' % name
+        fname = '--no-%s' % name
+        dest = name.replace('-', '_')
+        if default:
+            thelp = optparse.SUPPRESS_HELP
+            fhelp = help
+        else:
+            thelp = help
+            fhelp = optparse.SUPPRESS_HELP
+
+        topt = self.add_option(tname, action="store_true", default=default,
+                               help=thelp)
+        fopt = self.add_option(fname, action="store_false", dest=dest,
+                               help=fhelp)
+
+        return topt,fopt
+
+    def __getattr__(self, attr):
+        if attr.startswith('_'):
+            return super(OptionParser, self).__getattr__(attr)
+
+        if attr in self._options:
+            return self._options[attr]
+
+        raise AttributeError, "Option %s not found" % attr
+
+    def __setattr__(self, attr, value):
+        if attr.startswith('_'):
+            return super(OptionParser, self).__setattr__(attr, value)
+
+        if attr in self._options:
+            self._options[attr] = value
+
+        return super(OptionParser, self).__setattr__(attr, value)
+
+    def parse_args(self):
+        opts,args = self._optparse.parse_args()
+
+        for key,val in opts.__dict__.iteritems():
+            if val is not None or key not in self._options:
+                self._options[key] = val
+
+        return args
+
+    def usage(self, exitcode=None):
+        self._optparse.print_help()
+        if exitcode is not None:
+            sys.exit(exitcode)
+