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# ishelve.py
import os
import shelve
import plac
DEFAULT_SHELVE = 'conf.shelve'
@plac.annotations(
help=('show help', 'flag'),
showall=('show all parameters in the shelve', 'flag'),
clear=('clear the shelve', 'flag'),
delete=('delete an element', 'option'),
filename=('filename of the shelve', 'option'),
params='names of the parameters in the shelve',
setters='setters param=value')
def main(help, showall, clear, delete, filename=DEFAULT_SHELVE,
*params, **setters):
"A simple interface to a shelve. Use .help to see the available commands."
sh = shelve.open(filename)
try:
if not any([help, showall, clear, delete, params, setters]):
yield ('no arguments passed, use .help to see the '
'available commands')
elif help: # custom help
yield 'Commands: .help, .showall, .clear, .delete'
yield '<param> ...'
yield '<param=value> ...'
elif showall:
for param, name in sh.items():
yield '%s=%s' % (param, name)
elif clear:
sh.clear()
yield 'cleared the shelve'
elif delete:
try:
del sh[delete]
except KeyError:
yield '%s: not found' % delete
else:
yield 'deleted %s' % delete
for param in params:
try:
yield sh[param]
except KeyError:
yield '%s: not found' % param
for param, value in setters.items():
sh[param] = value
yield 'setting %s=%s' % (param, value)
finally:
sh.close()
main.add_help = False # there is a custom help, remove the default one
main.prefix_chars = '.' # use dot-prefixed commands
if __name__ == '__main__':
for output in plac.call(main):
print(output)
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