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"""String formatter that allows default values to be passed in the
template string.
This does not really belong in the calendar-cli package. I was
googling a bit, and didn't find anything like this out there ... but
I'm sure there must exist something like this?"""
import datetime
import string
import re
class NoValue():
def __getattr__(self, attr):
return self
def __getitem__(self, attr):
return self
def __str__(self):
return ""
def __format__(self, spec):
try:
return "".__format__(spec)
except:
return ""
no_value = NoValue()
class Template(string.Formatter):
def __init__(self, template):
self.template = template
def format(self, *pargs, **kwargs):
return super().format(self.template, *pargs, **kwargs)
def get_value(self, key, args, kwds):
try:
return string.Formatter.get_value(self, key, args, kwds)
except:
return no_value
def format_field(self, value, format_spec):
rx = re.match(r'\?([^\?]*)\?(.*)', format_spec)
if rx:
format_spec = rx.group(2)
if value is no_value:
value = rx.group(1)
try:
return string.Formatter.format_field(self, value, format_spec)
except:
return string.Formatter.format_field(self, value, "")
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