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__revision__ = "src/engine/SCons/Scanner/Prog.py 5357 2011/09/09 21:31:03 bdeegan"

import SCons.Node
import SCons.Node.FS
import SCons.Scanner
import SCons.Util

# global, set by --debug=findlibs
print_find_libs = None

def ProgramScanner(**kw):
    """Return a prototype Scanner instance for scanning executable
    files for static-lib dependencies"""
    kw['path_function'] = SCons.Scanner.FindPathDirs('LIBPATH')
    ps = SCons.Scanner.Base(scan, "ProgramScanner", **kw)
    return ps

def scan(node, env, libpath = ()):
    """
    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:
        libs = env['LIBS']
    except KeyError:
        # There are no LIBS in this environment, so just return a null list:
        return []
    if SCons.Util.is_String(libs):
        libs = libs.split()
    else:
        libs = SCons.Util.flatten(libs)

    try:
        prefix = env['LIBPREFIXES']
        if not SCons.Util.is_List(prefix):
            prefix = [ prefix ]
    except KeyError:
        prefix = [ '' ]

    try:
        suffix = env['LIBSUFFIXES']
        if not SCons.Util.is_List(suffix):
            suffix = [ suffix ]
    except KeyError:
        suffix = [ '' ]

    pairs = []
    for suf in map(env.subst, suffix):
        for pref in map(env.subst, prefix):
            pairs.append((pref, suf))

    result = []

    if callable(libpath):
        libpath = libpath()

    find_file = SCons.Node.FS.find_file
    adjustixes = SCons.Util.adjustixes
    for lib in libs:
        if SCons.Util.is_String(lib):
            lib = env.subst(lib)
            for pref, suf in pairs:
                l = adjustixes(lib, pref, suf)
                l = find_file(l, libpath, verbose=print_find_libs)
                if l:
                    result.append(l)
        else:
            result.append(lib)

    return result

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