"""Tools for helping with Subversion."""

import glob
import os
import sys


def _sitepackages():
    """Return absolute site-packages/site-python."""
    if sys.platform == 'darwin' and 'Python.framework' in sys.prefix:
        # for framework builds *only* we add the standard Apple
        # locations. Currently only per-user, but /Library and
        # /Network/Library could be added too
        home = os.environ.get('HOME')
        if home:
            return os.path.join(home, 'Library', 'Python',
                                sys.version[:3], 'site-packages')
    
    if sys.platform in ('os2emx', 'riscos'):
        return os.path.join(sys.prefix, "Lib", "site-packages")
    elif os.sep == '/':
        return os.path.join(sys.prefix, "lib", "python" + sys.version[:3],
                            "site-packages")
    else:
        return os.path.join(sys.prefix, "lib", "site-packages")
    return None


def native_eol(path, linesep=None, pattern="*.py"):
    """Assert native EOL in the given file (or all matches in the given package).
    
    Uses os.linesep for the new output.
    """
    
    if not os.path.isabs(path):
        path = os.path.join(_sitepackages(), path)
    
    if os.path.isdir(path):
        paths = []
        pat = os.path.join(path, pattern)
        paths.extend(glob.glob(pat))
        for root, dirs, files in os.walk(path):
            for d in dirs:
                pat = os.path.join(root, d, pattern)
                paths.extend(glob.glob(pat))
    else:
        paths = [path]
    
    for path in paths:
        print path
        data = open(path, 'rb').read()
        
        if linesep is None:
            linesep = os.linesep
        
        if linesep == '\r':
            data = data.replace('\r\n', '\r').replace('\n', '\r')
        elif linesep == '\n':
            data = data.replace('\r\n', '\n').replace('\r', '\n')
        elif linesep == '\r\n':
            data = data.replace('\r\n', '\n').replace('\r', '\n').replace('\n', '\r\n')
        else:
            raise ValueError("Unknown linesep %r" % linesep)
        
        open(path, 'wb').write(data)