svn2svn/ui.py

   1 """ User interface functions """
   2
   3 import os
   4 import sys
   5
   6 def termwidth():
   7     if 'COLUMNS' in os.environ:
   8         try:
   9             return int(os.environ['COLUMNS'])
  10         except ValueError:
  11             pass
  12     try:
  13         import termios, array, fcntl
  14         for dev in (sys.stdout, sys.stdin):
  15             try:
  16                 fd = dev.fileno()
  17                 if not os.isatty(fd):
  18                     continue
  19                 arri = fcntl.ioctl(fd, termios.TIOCGWINSZ, '\0' * 8)
  20                 return array.array('h', arri)[1]
  21             except ValueError:
  22                 pass
  23     except ImportError:
  24         pass
  25     return 80
  26
  27
  28 # Log levels
  29 ERROR = 0
  30 DEFAULT = 10
  31 VERBOSE = 20
  32 DEBUG = 30
  33
  34
  35 # SGR foreground color codes
  36 _colors = {
  37     'BLACK':    '30', 'BLACK_B':   '90',
  38     'RED':      '31', 'RED_B':     '91',
  39     'GREEN':    '32', 'GREEN_B':   '92',
  40     'YELLOW':   '33', 'YELLOW_B':  '93',
  41     'BLUE':     '34', 'BLUE_B':    '94',
  42     'MAGENTA':  '35', 'MAGENTA_B': '95',
  43     'CYAN':     '36', 'CYAN_B':    '96',
  44     'WHITE':    '37', 'WHITE_B':   '97' }
  45
  46
  47 # Configuration
  48 _level = DEFAULT
  49
  50
  51 def status(msg, *args, **kwargs):
  52     """Write a status message.
  53
  54     args are treated as substitutions for msg.
  55
  56     The following keyword arguments are allowed:
  57       level    : One of DEFAULT, VERBOSE or DEBUG.
  58       linebreak: If True a new line is appended to msg (default: True).
  59       truncate : Truncate output if larger then term width (default: True).
  60     """
  61     global _level
  62     level = kwargs.get('level', DEFAULT)
  63     if level > _level:
  64         return
  65     width = termwidth()
  66     if args:
  67         msg = msg % args
  68     if kwargs.get('linebreak', True):
  69         msg = '%s%s' % (msg, os.linesep)
  70     if level == ERROR:
  71         stream = sys.stderr
  72     else:
  73         stream = sys.stdout
  74     if kwargs.get('truncate', False) and level != ERROR:
  75         add_newline = msg.endswith('\n')
  76         msglines = msg.splitlines()
  77         for no, line in enumerate(msglines):
  78             if len(line) > width:
  79                 msglines[no] = line[:width-3]+"..."
  80         msg = os.linesep.join(msglines)
  81         if add_newline:
  82             msg = '%s%s' % (msg, os.linesep)
  83     if isinstance(msg, unicode):
  84         msg = msg.encode('utf-8')
  85     color = kwargs.get('color', None)
  86     bold =  kwargs.get('bold',  None)
  87     if color in _colors:
  88         msg = '%s%s%s' % ("\x1b["+_colors[color]+(";1" if bold else "")+"m", msg, "\x1b[0m")
  89     stream.write(msg)
  90     stream.flush()
  91
  92
  93 def update_config(options):
  94     """Update UI configuration."""
  95     global _level
  96     _level = options.verbosity