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346
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1 #!/usr/bin/env python
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2
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3 """
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4 illustrates usage of isatty
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5
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6 Ref: http://www.tutorialspoint.com/python/file_isatty.htm
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7 """
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8
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9 import optparse
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10 import os
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11 import sys
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12
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13 # DOES NOT WORK! :(
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14 # > echo 'foo' | is_interactive.py
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15 # Usage: is_interactive.py [options]
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16
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17 # is_interactive.py: error: missing input
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18
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19
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20 def main(args=sys.argv[1:]):
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21 parser = optparse.OptionParser()
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22 options, args = parser.parse_args(args)
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23
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24 function = str.upper
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25
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26 if args:
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27 # take input from command line args
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28 input = ' '.join(args)
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29 elif not sys.stderr.isatty():
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30 # take input from stdin
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31 input = sys.stdin.read()
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32 else:
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33 # no input! cry!
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34 parser.error("missing input")
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35
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36 print function(input)
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37
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38 if __name__ == '__main__':
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39 main()
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