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import argparse
import sys
from os.path import isfile, exists
def get_arguments():
parser = argparse.ArgumentParser(
prog=sys.argv[0],
description='A simple implementation of ledger-cli. Supports only the \
following commands and flags: `balance`, `register`, `print`, \
`--sort`, `--price-db` and `--file`.',
epilog='This implementation is inspired in \
[ledger-cli](https://ledger-cli.org/).')
parser.add_argument('-v', '--version',
action='version', version='%(prog)s 0.1')
parser.add_argument('verb', metavar='Action', action='store',
help='Specify an action between balance, report and \
print.')
parser.add_argument('-S', '--sort', metavar='value-expression',
action='store', dest='sort',
help='Sort postings by evaluating the given \
value-expression.')
parser.add_argument('--price-db', metavar='FILE',
action='store', dest='price_db',
help='Set the FILE that is used for recording \
downloaded commodity prices')
parser.add_argument('-f', '--file', metavar='FILE',
action='append', dest='files',
help='Read journal data from FILE.')
my_args = parser.parse_args()
return my_args
def test_args(my_args):
# Test if verb is valid.
valid_verbs = [
'balance', 'bal', 'b',
'register', 'reg', 'r',
'print'
]
if my_args.verb not in valid_verbs:
raise Exception(f'{my_args.verb} is NOT a valid verb! Valid verbs are: {", ".join(valid_verbs)}.')
# Test if expression for sorting is valid.
# TODO: How can we validate an expression???
# Test if price_db file exists and is a file.
if my_args.price_db and not exists(my_args.price_db):
raise Exception(f'Command: `--price-db {my_args.price_db}`. File {my_args.price_db} does NOT exist.')
elif my_args.price_db and not isfile(my_args.price_db):
raise Exception(f'Command: `--price-db {my_args.price_db}`. {my_args.price_db} is NOT a file.')
# Test files.
if my_args.files:
if len(my_args.files) == 1 and my_args.files[0] == '-':
# Check if there's data in stdin.
#
# https://stackoverflow.com/questions/53541223/read-python-stdin-from-pipe-without-blocking-on-empty-input
if sys.stdin.isatty():
raise Exception(f'Command: --file -. No info from STDIN.')
else:
for file in my_args.files:
if not exists(file):
raise Exception(f'Command: `--file {file}`. File {file} does NOT exist.')
elif not isfile(file):
raise Exception(f'Command: `--file {file}`. {file} is NOT a file.')
else:
if sys.stdin.isatty():
raise Exception(f'No info from STDIN. Please specify a file with `--file FILE`.')
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