import sys, os
import vars

# By default, no output colouring.
RED    = ""
GREEN  = ""
YELLOW = ""
BOLD   = ""
PLAIN  = ""

if sys.stderr.isatty():
    # ...use ANSI formatting codes.
    RED    = "\x1b[31m"
    GREEN  = "\x1b[32m"
    YELLOW = "\x1b[33m"
    BOLD   = "\x1b[1m"
    PLAIN  = "\x1b[m"


def log_(s):
    sys.stdout.flush()
    if vars.DEBUG_PIDS:
        sys.stderr.write('%d %s' % (os.getpid(), s))
    else:
        sys.stderr.write(s)
    sys.stderr.flush()


def log(s):
    log_(''.join([GREEN,  "redo  ", vars.DEPTH, BOLD, s, PLAIN]))

def err(s):
    log_(''.join([RED,    "redo  ", vars.DEPTH, BOLD, s, PLAIN]))

def warn(s):
    log_(''.join([YELLOW, "redo  ", vars.DEPTH, BOLD, s, PLAIN]))


def debug(s):
    if vars.DEBUG >= 1:
        log_('redo: %s%s' % (vars.DEPTH, s))
def debug2(s):
    if vars.DEBUG >= 2:
        log_('redo: %s%s' % (vars.DEPTH, s))
def debug3(s):
    if vars.DEBUG >= 3:
        log_('redo: %s%s' % (vars.DEPTH, s))