Specify preprocessor for wrapped errors

[neithere]

Use cases:

• every wrapped error should be printed in red colour.
• every wrapped error should have the prefix "ERR:".

Example code:

import termcolor

def format_error(excinfo):
    return termcolor.colored('ERR: {0}!'.format(excinfo), 'red')

@wrap_errors([KeyError], processor=format_error)
def func(key):
    return db[key]

Note: This issue has been automatically migrated from Bitbucket
Created by @neithere on 2013-01-14 05:54:56+00:00, last updated: 2013-01-14 06:57:17+00:00

[neithere]

Backwards compatibility notes

The old version of @wrap_errors() expects *args. It is impossible to add an optional named argument as a function with signature wrap_errors(processor=None, *errors), called as wrap_errors(KeyError), would be interpreted as wrap_errors(processor=KeyError). This is way it is now required that the first argument is an optional list.

A hack is added to maintain backward compatibility until Argh 1.0.

Argh 1.0 should be released without the hack, i.e. all code written in the old style — @wrap_errors(ExceptionClass) — will break.

A DeprecationWarning should be emitted. Release notes should contain migration guidelines.

Note: This comment has been automatically migrated from Bitbucket
Created by @neithere on 2013-01-14 06:12:22+00:00

[neithere]

Fix #36: Specify preprocessor for wrapped errors

Added hack for backwards compatibility + deprecation warning.

→ <<cset 94b2ee4c8e9d>>

Note: This comment has been automatically migrated from Bitbucket
Created by @neithere on 2013-01-14 06:57:17+00:00