space: New program for fixing whitespace problems in text files.

[misc] / cdb-list

#! /usr/bin/python

from cdb import cdbmake
from sre import compile as r_compile, sub as r_sub
from sys import argv, stdin, stderr, exit

ego = r_sub(r'^.*[/\\]', '', argv[0])
def die(msg, prefix = True):
  if prefix: msg ='%s: %s' % (ego, msg) 
  print >>stderr, msg
  exit(1)

def files(args):
  if len(args) == 0:
    yield stdin
  else:
    for a in args:
      if a == '-':
        yield stdin
      else:
        yield open(a, 'r')

if len(argv) < 2:
  die('usage: %s CDB [INPUT ...]' % ego, False)

rx_comment = r_compile(r'^\s*(\#|$)')
rx_shave = r_compile(r'\s*(.*\S|)\s*$')

cdb = cdbmake(argv[1], argv[1] + '.new')
for f in files(argv[2:]):
  for line in f:
    if len(line) and line[-1] == '\n': line = line[:-1]
    if rx_comment.match(line):
      continue
    line = rx_shave.sub(r'\1', line)
    cdb.add(line, '')
cdb.finish()