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"""distutils.util
Miscellaneous utility functions -- anything that doesn't fit into
one of the other *util.py modules."""
# created 1999/03/08, Greg Ward
__revision__ = "$Id$"
import sys, os, string, re, shutil
from distutils.errors import *
from distutils.spawn import spawn
# for backwards compatibility:
from distutils.file_util import *
from distutils.dir_util import *
from distutils.dep_util import *
from distutils.archive_util import *
# Need to define 'abspath()', because it was new with Python 1.5.2
if hasattr (os.path, 'abspath'):
abspath = os.path.abspath
else:
def abspath(path):
if not os.path.isabs(path):
path = os.path.join(os.getcwd(), path)
return os.path.normpath(path)
# More backwards compatability hacks
def extend (list, new_list):
"""Appends the list 'new_list' to 'list', just like the 'extend()'
list method does in Python 1.5.2 -- but this works on earlier
versions of Python too."""
if hasattr (list, 'extend'):
list.extend (new_list)
else:
list[len(list):] = new_list
# extend ()
def get_platform ():
"""Return a string (suitable for tacking onto directory names) that
identifies the current platform. Under Unix, identifies both the OS
and hardware architecture, e.g. "linux-i586", "solaris-sparc",
"irix-mips". For Windows and Mac OS, just returns 'sys.platform' --
i.e. "???" or "???"."""
if os.name == 'posix':
(OS, _, rel, _, arch) = os.uname()
return "%s%c-%s" % (string.lower (OS), rel[0], string.lower (arch))
else:
return sys.platform
# get_platform()
def native_path (pathname):
"""Return 'pathname' as a name that will work on the native
filesystem, i.e. split it on '/' and put it back together again
using the current directory separator. Needed because filenames in
the setup script are always supplied in Unix style, and have to be
converted to the local convention before we can actually use them in
the filesystem. Raises ValueError if 'pathname' is
absolute (starts with '/') or contains local directory separators
(unless the local separator is '/', of course)."""
if pathname[0] == '/':
raise ValueError, "path '%s' cannot be absolute" % pathname
if pathname[-1] == '/':
raise ValueError, "path '%s' cannot end with '/'" % pathname
if os.sep != '/':
if os.sep in pathname:
raise ValueError, \
"path '%s' cannot contain '%c' character" % (pathname, os.sep)
else:
paths = string.split (pathname, '/')
return apply (os.path.join, paths)
else:
return pathname
# native_path ()
def change_root (new_root, pathname):
"""Return 'pathname' with 'new_root' prepended. If 'pathname' is
relative, this is equivalent to "os.path.join(new_root,pathname)".
Otherwise, it requires making 'pathname' relative and then joining the
two, which is tricky on DOS/Windows and Mac OS.
"""
if os.name == 'posix':
if not os.path.isabs (pathname):
return os.path.join (new_root, pathname)
else:
return os.path.join (new_root, pathname[1:])
elif os.name == 'nt':
(drive, path) = os.path.splitdrive (pathname)
if path[0] == '\\':
path = path[1:]
return os.path.join (new_root, path)
elif os.name == 'mac':
raise RuntimeError, "no clue how to do this on Mac OS"
else:
raise DistutilsPlatformError, \
"nothing known about platform '%s'" % os.name
_environ_checked = 0
def check_environ ():
"""Ensure that 'os.environ' has all the environment variables we
guarantee that users can use in config files, command-line
options, etc. Currently this includes:
HOME - user's home directory (Unix only)
PLAT - desription of the current platform, including hardware
and OS (see 'get_platform()')
"""
global _environ_checked
if _environ_checked:
return
if os.name == 'posix' and not os.environ.has_key('HOME'):
import pwd
os.environ['HOME'] = pwd.getpwuid (os.getuid())[5]
if not os.environ.has_key('PLAT'):
os.environ['PLAT'] = get_platform ()
_environ_checked = 1
def subst_vars (str, local_vars):
"""Perform shell/Perl-style variable substitution on 'string'.
Every occurence of '$' followed by a name, or a name enclosed in
braces, is considered a variable. Every variable is substituted by
the value found in the 'local_vars' dictionary, or in 'os.environ'
if it's not in 'local_vars'. 'os.environ' is first checked/
augmented to guarantee that it contains certain values: see
'_check_environ()'. Raise ValueError for any variables not found in
either 'local_vars' or 'os.environ'."""
check_environ ()
def _subst (match, local_vars=local_vars):
var_name = match.group(1)
if local_vars.has_key (var_name):
return str (local_vars[var_name])
else:
return os.environ[var_name]
return re.sub (r'\$([a-zA-Z_][a-zA-Z_0-9]*)', _subst, str)
# subst_vars ()
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