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Add the ability to read from stdin #34

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Add the ability to read from stdin #34

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12 changes: 10 additions & 2 deletions cowsay/__main__.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import argparse
import sys

from . import CowsayError, char_names, char_funcs, __version__

Expand All @@ -15,7 +16,7 @@ def cli():
default='cow')

parser.add_argument('-t', '--text',
required=True)
help='Text to display. If not provided, reads from stdin.')

parser.add_argument('-v', '--version',
action='version', version=__version__)
Expand All @@ -25,7 +26,14 @@ def cli():
if args.character not in char_names:
raise CowsayError(f'Available Characters: {char_names}')

char_funcs[args.character](args.text)
if args.text:
text = args.text
else:
if sys.stdin.isatty():
parser.error('Text argument is required if not piping input.')
text = sys.stdin.read().strip()

char_funcs[args.character](text)


if __name__ == "__main__":
Expand Down