import logging, sys

"""
    Fancy tree-structured logging output
"""

log_level = logging.INFO
stack = []

class g :
    out_depth = 0
    node = None

def title (title, *args) :
    stack.append(title)

    print "%s - %s" % (" "*g.out_depth, title % args)

    g.out_depth += 1

def down (dir_name, *args) :
    stack.append(dir_name % args)
    g.node = None

def next (fname, *args) :
    g.node = fname % args

def up () :
    stack.pop(-1)
    g.node = None
    g.out_depth = min(g.out_depth, len(stack))

def done () :
    print "done"

def log (level, message, *args, **kwargs) :
    wait = kwargs.get("wait", False)

    if level >= log_level :
        if g.out_depth != len(stack) :
            for segment in stack[g.out_depth:] :
                print "%sd %s" % (" "*g.out_depth, segment)
                g.out_depth += 1

        if g.node :
            print "%sf %s" % (" "*g.out_depth, g.node)
            g.node = None
        
        if wait :
            print "%s - %s..." % (" "*g.out_depth, message % args),
            sys.stdout.flush()
        else :
            print "%s - %s" % (" "*g.out_depth, message % args)

def _level (level) :
    def _log_func (message, *args, **kwargs) :
        log(level, message, *args, **kwargs)
    
    return _log_func

debug       = _level(logging.DEBUG)
info        = _level(logging.INFO)
warning     = _level(logging.WARNING)
error       = _level(logging.ERROR)