oaknut-exception
Categorised exceptions and a CLI error-reporting boundary for the
oaknut-* family of packages.
The package defines a small exception hierarchy that every other
oaknut-* package's domain errors slot into:
OaknutException— root of the hierarchy. Carries anexit_codeproperty derived from the BSDsysexits.hset (via theexit-codespackage).DataError— the operation failed because of the data it was given (a user-supplied path, a corrupted on-disc structure, an unsupported filetype). No traceback at the CLI boundary.ConfigurationError— the operation failed because of a runtime environment / configuration issue. No traceback at the CLI boundary.InternalError— the operation failed because something went wrong inside the library. Traceback retained at the CLI boundary so the report-an-issue path is obvious.
Plus a single error-handling boundary helper:
handled_errors— a context manager (also usable as a decorator) that catchesDataErrorandConfigurationError, prints them via a caller-supplied printer, and exits with the most appropriateExitCode.InternalErrorand unexpected exceptions propagate so their tracebacks reach the user.KeyboardInterruptexits with the conventional128 + SIGINTstatus.
This package is what every oaknut-disc-like CLI uses to map library
errors onto stable exit codes without dropping into try/except in every
command.
See the oaknut documentation for the full API reference.
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