Add quiet flag for usage in cronjobs

README.md

@@ -30,6 +30,9 @@ Write the currency results to standard output, formatted as CSV:
 |ISO4217 abbreviation|Full German name|Asking rate|Bidding rate|Date the rate was valid on|
 |:---|:---|:---|:---|:---|
 
+#### `-q`, `--quiet`
+Do not output informational messages such as "Parsing..." or "Downloading..."
+
 #### `-i`, `--interactive`
 
 Calculate interactively on stdin

crawl.py

@@ -45,6 +45,12 @@ parser.add_argument(
     action='store_true',
     help='Write the results to stdout as CSV'
 )
+parser.add_argument(
+    '-q', '--quiet',
+    dest='quiet',
+    action='store_true',
+    help='Do not output the \'Downloading...\' and \'Parsing...\' messages.'
+)
 parser.add_argument(
     '--cache-dir',
     dest='cache_dir',
@@ -141,7 +147,8 @@ def is_float(string: str) -> bool:
 
 
 def _parse_date_from_args(date_str: str) -> DTDate:
-    return DTDateTime.strptime(date_str).date()
+    from dateutil.parser import isoparse
+    return isoparse(date_str).date()
 
 
 def calc_result(amt: float, rate: utils.Rate, direction: int, duty: float = 0) -> float:
@@ -202,17 +209,16 @@ if not filepath.exists():
 filename = filepath / utils.mk_filename(retrieve_date, use_card_type)
 if os.path.exists(filename):
     with open(filename, 'rb') as f:
-        results = utils.get_results_from_pdf(f)
+        results = utils.get_results_from_pdf(f, quiet=args.quiet)
 else:
-    buf = utils.get_fileio(retrieve_date, card_type=use_card_type)
+    buf = utils.get_fileio(retrieve_date, card_type=use_card_type, quiet=args.quiet)
     with open(filename, 'wb') as f:
         f.write(buf.read())
         buf.seek(0)
-    results = utils.get_results_from_pdf(buf)
+    results = utils.get_results_from_pdf(buf, quiet=args.quiet)
 #
 # processing
 #
-
 if args.interactive:
     try:
         while True:

utils.py

@@ -21,7 +21,6 @@ Rate = namedtuple('Rate', ['abbr', 'full_name', 'ask', 'bid', 'date'])
 CARD_MASTERCARD = ['0']
 CARD_VISA = ['1']
 
-
 class CurrencyResult:
     def __init__(self):
         self.rates = Dict[str, Rate]
@@ -80,7 +79,7 @@ def _parse_line(line: str, ctx: CurrencyResult) -> Rate or None:
     return rate
 
 
-def get_results_from_text(text: str, currency: str = None) -> CurrencyResult:
+def get_results_from_text(text: str, currency: str = None, quiet: bool = False) -> CurrencyResult:
     rates = OrderedDict()
     result = CurrencyResult()
     lines = text.splitlines()
@@ -107,19 +106,22 @@ def get_results_from_text(text: str, currency: str = None) -> CurrencyResult:
     return result
 
 
-def get_results_from_pdf(buf: BinaryIO or str, currency: str = None) -> CurrencyResult:
-    print('Parsing data... ', end='', file=stderr)
+def get_results_from_pdf(buf: BinaryIO or str, currency: str = None, quiet: bool = False) -> CurrencyResult:
+    if not quiet:
+        print('Parsing data... ', end='', file=stderr)
     reader = PyPDF3.PdfFileReader(buf)
     text = str()
     for num in range(0, reader.getNumPages()-1):
         text += reader.getPage(num).extractText()
-    print('Done.', file=stderr)
-    return get_results_from_text(text, currency=currency)
+    if not quiet:
+        print('Done.', file=stderr)
+    return get_results_from_text(text, currency=currency, quiet=quiet)
 
 
-def get_fileio(date: DTDate, card_type: List[str] = CARD_VISA) -> BinaryIO: # pylint: disable=dangerous-default-value
+def get_fileio(date: DTDate, card_type: List[str] = CARD_VISA, quiet: bool = False) -> BinaryIO: # pylint: disable=dangerous-default-value
     # pylint: disable=no-member # mechanize.Browser has some lazy-loading methods that pylint doesn't see
-    print('Downloading rates for ' + date.strftime('%Y-%m-%d') + '... ', end='', file=stderr)
+    if not quiet:
+        print('Downloading rates for ' + date.strftime('%Y-%m-%d') + '... ', end='', file=stderr)
     b = m.Browser()
     # Firefox 64 User-Agent
     # ua = 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:64.0) Gecko/20100101 Firefox/64.0'
@@ -143,7 +145,8 @@ def get_fileio(date: DTDate, card_type: List[str] = CARD_VISA) -> BinaryIO: # py
     rq = fm.click(name='submitButton', coord=(random.randint(1, 114), random.randint(1, 20)))
     rq.add_header('Accept', '*/*')
     rp = b.retrieve(rq)
-    print(' Done.', file=stderr)
+    if not quiet:
+        print(' Done.', file=stderr)
     # Returns an open file-like object with the PDF as contents
     return open(rp[0], 'rb')