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a0ef087e73
Adds a new `Deprecated` rule group in addition to `Stable` and `Preview`. Deprecated rules: - Warn on explicit selection without preview - Error on explicit selection with preview - Are excluded when selected by prefix with preview Deprecates `TRY200`, `ANN101`, and `ANN102` as a proof of concept. We can consider deprecating them separately.
150 lines
3.3 KiB
Markdown
150 lines
3.3 KiB
Markdown
# Preview
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Ruff includes an opt-in preview mode to provide an opportunity for community feedback and increase confidence that
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changes are a net-benefit before enabling them for everyone.
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Preview mode enables a collection of newer lint rules, fixes, and formatter style changes that are
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considered experimental or unstable,.
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## Enabling preview mode
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Preview mode can be enabled with the `--preview` flag on the CLI or by setting `preview = true` in your Ruff
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configuration file.
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Preview mode can be configured separately for linting and formatting (requires Ruff v0.1.1+). To enable preview lint rules without preview style formatting:
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=== "pyproject.toml"
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```toml
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[tool.ruff.lint]
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preview = true
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```
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=== "ruff.toml"
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```toml
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[lint]
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preview = true
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```
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To enable preview style formatting without enabling any preview lint rules:
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=== "pyproject.toml"
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```toml
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[tool.ruff.format]
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preview = true
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```
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=== "ruff.toml"
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```toml
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[format]
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preview = true
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```
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## Using rules that are in preview
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If a rule is marked as preview, it can only be selected if preview mode is enabled. For example, consider a
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hypothetical rule, `HYP001`. If `HYP001` were in preview, it would _not_ be enabled by adding following to your
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config file:
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=== "pyproject.toml"
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```toml
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[tool.ruff.lint]
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extend-select = ["HYP001"]
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```
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=== "ruff.toml"
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```toml
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[lint]
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extend-select = ["HYP001"]
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```
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It also would _not_ be enabled by selecting the `HYP` category, like so:
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=== "pyproject.toml"
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```toml
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[tool.ruff.lint]
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extend-select = ["HYP"]
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```
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=== "ruff.toml"
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```toml
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[lint]
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extend-select = ["HYP"]
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```
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Similarly, it would _not_ be enabled via the `ALL` selector:
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=== "pyproject.toml"
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```toml
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[tool.ruff.lint]
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select = ["ALL"]
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```
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=== "ruff.toml"
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```toml
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[lint]
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select = ["ALL"]
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```
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However, it would be enabled in any of the above cases if you enabled preview in your configuration file:
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=== "pyproject.toml"
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```toml
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[tool.ruff.lint]
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extend-select = ["HYP"]
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preview = true
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```
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=== "ruff.toml"
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```toml
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[lint]
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extend-select = ["HYP"]
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preview = true
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```
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Or, if you provided the `--preview` CLI flag.
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To see which rules are currently in preview, visit the [rules reference](rules.md).
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## Selecting single preview rules
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When preview mode is enabled, selecting rule categories or prefixes will include all preview rules that match.
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If you'd prefer to opt-in to each preview rule individually, you can toggle the `explicit-preview-rules`
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setting in your configuration file:
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=== "pyproject.toml"
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```toml
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[tool.ruff.lint]
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preview = true
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explicit-preview-rules = true
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```
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=== "ruff.toml"
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```toml
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[lint]
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preview = true
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explicit-preview-rules = true
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```
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In our previous example, `--select` with `ALL` `HYP`, `HYP0`, or `HYP00` would not enable `HYP001`. Each preview
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rule will need to be selected with its exact code, e.g. `--select ALL,HYP001`.
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If preview mode is not enabled, this setting has no effect.
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## Deprecated rules
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When preview mode is enabled, deprecated rules will be disabled. If a deprecated rule is selected explicitly, an
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error will be raised. Deprecated rules will not be included if selected via a rule category or prefix.
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