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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

import string

import SCons.Node.FS
import SCons.Scanner

def DirScanner(**kw):
    """Return a prototype Scanner instance for scanning
    directories for on-disk files"""
    def only_dirs(nodes):
        return filter(lambda n: isinstance(n.disambiguate(),
                                SCons.Node.FS.Dir),
                      nodes)
    kw['node_factory'] = SCons.Node.FS.Entry
    kw['recursive'] = only_dirs
    ds = apply(SCons.Scanner.Base, (scan, "DirScanner"), kw)
    return ds

skip_entry = {
   '.' : 1,
   '..' : 1,
   '.sconsign' : 1,
   '.sconsign.dblite' : 1,
}

def scan(node, env, path=()):
    """
    This scanner scans program files for static-library
    dependencies.  It will search the LIBPATH environment variable
    for libraries specified in the LIBS variable, returning any
    files it finds as dependencies.
    """
    try:
        flist = node.fs.listdir(node.abspath)
    except OSError:
        return []
    dont_scan = lambda k: not skip_entry.has_key(k)
    flist = filter(dont_scan, flist)
    flist.sort()
    return map(node.Entry, flist)