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# vim: set fileencoding=utf-8 :
#
# (C) 2014 Guido Günther <agx@sigxcpu.org>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, please see
# <http://www.gnu.org/licenses/>
"""Format a message"""
from gbp.errors import GbpError
def format_str(msg, args):
"""
Format a string with the given dict. Be a bit more verbose than
default python about the error cause.
>>> format_str("%(foo)", {})
Traceback (most recent call last):
...
gbp.errors.GbpError: Failed to format %(foo): Missing value 'foo' in {}
>>> format_str("%(foo)", {'foo': 'bar'})
Traceback (most recent call last):
...
gbp.errors.GbpError: Failed to format %(foo) with {'foo': 'bar'}: incomplete format
>>> format_str("A %(foo)s is a %(bar)s", {'foo': 'dog', 'bar': 'mamal'})
'A dog is a mamal'
"""
try:
return msg % args
except ValueError as e:
raise GbpError("Failed to format %s with %s: %s" % (msg, args, e))
except KeyError as e:
raise GbpError("Failed to format %s: Missing value %s in %s" %
(msg, e, args))
def format_b(fmtstr, *args):
"""String-like interpolation for bytes objects.
NOTE: This is a compatibility wrapper for older versions (<3.5) of Python 3
which do not support the percent operator ('%') for bytes objects. This
function should be removed (and replaced by simple '%') when Python 3.5
has gained wide enough adoption.
>>> format_b(b'%s %d', b'foo', 123)
b'foo 123'
>>> format_b(b'foo 123')
b'foo 123'
>>> format_b('%s %d', b'foo', 123)
Traceback (most recent call last):
...
AttributeError: 'str' object has no attribute 'decode'
"""
fmtstr = fmtstr.decode()
strargs = tuple([(a.decode() if isinstance(a, bytes) else a) for a in args])
return (fmtstr % strargs).encode()
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