| 1 | #!/usr/bin/env python
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| 2 | """
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| 3 | coproc.py
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| 4 | """
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| 5 |
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| 6 | import sys
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| 7 |
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| 8 |
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| 9 | def main(argv):
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| 10 | print >>sys.stderr, argv
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| 11 | try:
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| 12 | command = argv[1]
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| 13 | except IndexError:
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| 14 | command = 'upper'
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| 15 |
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| 16 | if command == 'upper':
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| 17 | func = lambda x: x.upper()
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| 18 | else:
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| 19 | func = lambda x: x.lower()
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| 20 |
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| 21 | while True:
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| 22 | line = sys.stdin.readline()
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| 23 | if not line:
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| 24 | print >>sys.stderr, 'DONE %s' % command
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| 25 | break
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| 26 | sys.stdout.write(func(line))
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| 27 | # If we don't do this, it hangs forever
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| 28 | sys.stdout.flush()
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| 29 |
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| 30 |
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| 31 | if __name__ == '__main__':
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| 32 | try:
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| 33 | main(sys.argv)
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| 34 | except RuntimeError as e:
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| 35 | print >>sys.stderr, 'FATAL: %s' % e
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| 36 | sys.exit(1)
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