csvpaste

#!/usr/bin/env python2.7

# Copyright (c) 2014 Elias Ponvert
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

from argparse import ArgumentParser
from csv import reader as csv_reader, writer as csv_writer

__author__ = "Elias Ponvert"
__copyright__ = "Copyright 2014, Elias Ponvert"
__version__ = 'v0.1.0'
__license__ = "MIT"

if __name__ == '__main__':
  ap = ArgumentParser(description="Like paste, for CSVs and TSVs and what not")
  ap.add_argument('--version', action='version', version='%(prog)s ' + __version__)
  ap.add_argument('-d', '--delimiter', metavar='DELIM', default='\t',
    help="use DELIM instead of TAB for field delimiter")
  ap.add_argument('--output-delimiter', metavar='STRING', default=None,
    help="use STRING as the output delimiter, the default is to use the input delimiter")
  ap.add_argument('--skip-header', action='store_true', help="skip first row of input")
  ap.add_argument('files', metavar='FILE', nargs='*', default=None, help="csv/tsv file input")

  import sys
  args = ap.parse_args(sys.argv[1:])

  input_delim = args.delimiter
  output_delim = args.output_delimiter if args.output_delimiter else input_delim
  file_handles = [open(f, 'rU') for f in args.files]
  csv_readers = [csv_reader(fh_in, delimiter=input_delim) for fh_in in file_handles]
  if args.skip_header:
    [reader.next() for reader in csv_readers]
  csv_out = csv_writer(sys.stdout, delimiter=output_delim)
  try:
    while True:
      csv_out.writerow(sum([reader.next() for reader in csv_readers], []))

  except (StopIteration, IOError):
    pass