command line tool to ensure that deprecated code is removed in a timely manner

# derp

Derp (Deprecation Enforcement and Removal Planning) is a command-line tool for ensuring that deprecated code is removed from your python package in a timely manner. Derp scans the application for deprecation flags and ensures that:

1. All deprecations have a planned removal version.
2. Deprecated objects are removed at the planned time.

## Usage

Install derp from pypi using pip: pip install derp. Invoke derp from the command line, specifying the package or module to analyze and the current version of the software. The command below will scan all modules in src/my_app and catch any deprecated code that is supposed to be removed by version 1.0.0.

derp src/my_app 1.0.0


The current version can also be read from a file. If src/my_app/__version__.py contains the version number, invoke the following.

derp src/my_app src/my_app/__version__.py


Including this command as part of a CI/CD script will ensure that deprecations are done thoughtfully and that deprecated code is removed on schedule.

Why use derp?

Derp was inspired by the belief that a lean codebase is more pleasant to work in, and as such deprecated code should be cleaned out as soon as is feasible. Including derp in your CI/CD pipeline pushes developers to clean out deprecated code.

What if I don't know when I want to remove a deprecated item?

"Next major version bump" is a good default.

What if I need to keep a deprecated item around longer than expected?

Increase the planned removal version. It's fine for deprecated code to stick around longer than expected, but it should happen intentionally, not because nobody got around to clearing it out.

What type of deprecations does derp catch?

Currently, derp only works with the deprecation library. It catches a single @deprecated annotation on a class or method.

What if I use a different deprecation tool or want to deprecate something that's neither a class nor a method?

Tell me about your use case, and I might add it. Alternatively, open a PR. See "derp/deprecation.py" for a discussion of how to add more types of deprecations.

What if I have multiple deprecation annotations on a single method?

Don't do that. Why are you doing that?

OK fine, if there's a legitimate reason to do this, let me know and I'll think about supporting it.

Couldn't I use the @fail_if_not_removed decorator?

Yeah, but that requires a developer to be conscientious every time they deprecate something. You have to voluntarily point it to the version number, select a removal version, and add @fail_if_not_removed on all relevant tests. It's easier to just slap @deprecated() with no arguments, move on, and forget about it. Derp will chide you: "you need to select a removal version." And when that version comes around it will poke you again: "time to remove this code."

## Project details

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