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Codemods based on LibCST

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# 👷‍♀️ OctoPrint codemods

Helpful codemods based on [LibCST](https://github.com/Instagram/LibCST/) created for use in OctoPrint development.

Provided as-is for documentational purposes.

## Setup

pip3 install .

## Usage

See

codemod_* --help

E.g.

```
$ codemod_not_in --help
usage: codemod_not_in [-h] [--before] [--after] [--dryrun] [--ignore IGNORE]
                      [--verbose] [--test]
                      bases [bases ...]

Converts 'not foo in bar' to 'foo not in bar' constructs.

positional arguments:
  bases            Files and directories (recursive) including python files to
                   be modified.

optional arguments:
  -h, --help       show this help message and exit
  --before         Write the CST of the original file to file.cst.before
  --after          Write the CST of the transformed file to file.cst.after
  --dryrun         Only perform a dry run without writing back the transformed
                   file
  --ignore IGNORE  Paths to ignore, add multiple as required
  --verbose        Generate output for all processed files, not juse for those
                   with replacements
  --test           Run in test mode: first path is input file, second path is
                   file with expected output.
```

To run in test mode, use `--test` and supply two files, input and expected output, e.g.:

```
$ codemod_not_in --test tests/input/not_in.py tests/expected/not_in.py
tests/input/not_in.py:4:0:
  not foo in bar
✨ Test successful, contents identical
```

For running multiple codemods on the same inputs, it is recommended to use `codemod_batch`:

```
$ codemod_batch --check not_in --check remove_float_conversion tests/input/file.py
tests/input/not_in.py:4:0:
  not foo in bar
tests/input/not_in.py: 1 replacements done
```

## pre-commit

This repository can be used with [pre-commit](https://pre-commit.com/).

```yaml
- repo: https://github.com/OctoPrint/codemods
  rev: "0.6.3"
  hooks:
      - id: codemod_not_in
```

Additional arguments can also be specified:

```yaml
- repo: https://github.com/OctoPrint/codemods
  rev: "0.6.3"
  hooks:
      - id: codemod_not_in
        args: ["--ignore", "lib/vendor"]
```

If more than one command should be run, use the `batch` command for better performance:

```yaml
- repo: https://github.com/OctoPrint/codemods
  rev: "0.6.3"
  hooks:
      - id: codemod_batch
        args:
            [
                "--ignore",
                "lib/vendor",
                "--check",
                "not_in",
                "--check",
                "remove_float_conversion"
            ]
```

## What codemods are available?

> 🛑 **Heads-up**
>
> Mods overlapping with [pyupgrade](https://github.com/asottile/pyupgrade) have been
> removed in version 0.6.0.

### `not_in`

Converts `not foo in bar` to `foo not in bar` constructs.

### `remove_builtins_imports`

Removes `from builtins import ...` and `import builtins`.

Use with Python 3 source only.

### `remove_float_conversion`

Removes unnecessary float conversions and `.0`s in division and multiplication.

Use with Python 3 source only, unless `from __future__ import division` is used.

## What code checks are available?

### `detect_past_builtins_imports`

Detects `from past... import ...` & `import past...`.

Use with Python 3 source only.

## Development

Checkout out the source. Install source and requirements, in editable mode:

```
pip install -e . -r requirements.txt
```

All existing tests can be run with `pytest`.

Individual tests can be run with `codemod_{codemod} --test tests/input/{codemod}.py tests/expected/{codemod}.py` (replacing `{codemod}` with the codemod to test).

When adding new codemods or checks, add implementation to `octoprint_codemods` (be sure to inherit from `octoprint_codemods.Codemod` or `octoprint_codemods.Codecheck` and implement `main` using `octoprint_codemods.runner`, see existing code).

`--before` and `--after` can be used to generated dumps of the CST before and after transformation. `--dryrun` helps to keep input unmodified during development.

## License

MIT

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