site_scons/gem5_scons/util.py

# Copyright (c) 2013, 2015-2017 ARM Limited
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# The license below extends only to copyright in the software and shall
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# licensed hereunder.  You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
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# Copyright (c) 2011 Advanced Micro Devices, Inc.
# Copyright (c) 2009 The Hewlett-Packard Development Company
# Copyright (c) 2004-2005 The Regents of The University of Michigan
# All rights reserved.
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# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
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import itertools
import re
import sys

import SCons.Script

import m5.util.terminal

def ignore_style():
    """Determine whether we should ignore style checks"""
    return SCons.Script.GetOption('ignore_style') or not sys.stdin.isatty()

def get_termcap():
    return m5.util.terminal.get_termcap(SCons.Script.GetOption('use_colors'))

def readCommand(cmd, **kwargs):
    """
    run the command cmd, read the results and return them
    this is sorta like `cmd` in shell

    :param cmd: command to run with Popen
    :type cmd: string, list
    :returns: command stdout
    :rtype: string
    """
    from subprocess import Popen, PIPE, STDOUT

    if isinstance(cmd, str):
        cmd = cmd.split()

    no_exception = 'exception' in kwargs
    exception = kwargs.pop('exception', None)

    kwargs.setdefault('shell', False)
    kwargs.setdefault('stdout', PIPE)
    kwargs.setdefault('stderr', STDOUT)
    kwargs.setdefault('close_fds', True)
    try:
        subp = Popen(cmd, **kwargs)
    except Exception as e:
        if no_exception:
            return -1, exception
        raise

    output = subp.communicate()[0].decode('utf-8')
    return output

def compareVersions(v1, v2):
    """helper function: compare arrays or strings of version numbers.
    E.g., compare_version((1,3,25), (1,4,1)')
    returns -1, 0, 1 if v1 is <, ==, > v2
    """
    def make_version_list(v):
        if isinstance(v, (list,tuple)):
            return v
        elif isinstance(v, str):
            return list(map(lambda x: int(re.match('\d+', x).group()),
                            v.split('.')))
        else:
            raise TypeError()

    v1 = make_version_list(v1)
    v2 = make_version_list(v2)

    # Compare corresponding elements of lists
    # The shorter list is filled with 0 till the lists have the same length
    for n1,n2 in itertools.zip_longest(v1, v2, fillvalue=0):
        if n1 < n2: return -1
        if n1 > n2: return  1

    return 0