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 # Configuration
  36 _level = DEFAULT
  37
  38
  39 def status(msg, *args, **kwargs):
  40     """Write a status message.
  41
  42     args are treated as substitutions for msg.
  43
  44     The following keyword arguments are allowed:
  45       level    : One of DEFAULT, VERBOSE or DEBUG.
  46       linebreak: If True a new line is appended to msg (default: True).
  47       truncate : Truncate output if larger then term width (default: True).
  48     """
  49     global _level
  50     level = kwargs.get('level', DEFAULT)
  51     if level > _level:
  52         return
  53     width = termwidth()
  54     if args:
  55         msg = msg % args
  56     if kwargs.get('linebreak', True):
  57         msg = '%s%s' % (msg, os.linesep)
  58     if level == ERROR:
  59         stream = sys.stderr
  60     else:
  61         stream = sys.stdout
  62     if kwargs.get('truncate', True) and level != ERROR:
  63         add_newline = msg.endswith('\n')
  64         msglines = msg.splitlines()
  65         for no, line in enumerate(msglines):
  66             if len(line) > width:
  67                 msglines[no] = line[:width-3]+"..."
  68         msg = os.linesep.join(msglines)
  69         if add_newline:
  70             msg = '%s%s' % (msg, os.linesep)
  71     if isinstance(msg, unicode):
  72         msg = msg.encode('utf-8')
  73     stream.write(msg)
  74     stream.flush()
  75
  76
  77 def update_config(options):
  78     """Update UI configuration."""
  79     global _level
  80     _level = options.verbosity