add ruff

technology/applications/development/ruff.md

@@ -0,0 +1,41 @@
+---
+obj: application
+repo: https://github.com/astral-sh/ruff
+website: https://docs.astral.sh/ruff
+rev: 2025-05-19
+---
+
+# ruff
+An extremely fast Python linter and code formatter, written in Rust.
+
+## The Ruff Linter
+The Ruff Linter is an extremely fast Python linter designed as a drop-in replacement for [Flake8](https://pypi.org/project/flake8/) (plus dozens of plugins), [isort](https://pypi.org/project/isort/), [pydocstyle](https://pypi.org/project/pydocstyle/), [pyupgrade](https://pypi.org/project/pyupgrade/), [autoflake](https://pypi.org/project/autoflake/), and more.
+
+### `ruff check`
+`ruff check` is the primary entrypoint to the Ruff linter. It accepts a list of files or directories, and lints all discovered Python files, optionally fixing any fixable errors. When linting a directory, Ruff searches for Python files recursively in that directory and all its subdirectories:
+
+```console
+$ ruff check                  # Lint files in the current directory.
+$ ruff check --fix            # Lint files in the current directory and fix any fixable errors.
+$ ruff check --watch          # Lint files in the current directory and re-lint on change.
+$ ruff check path/to/code/    # Lint files in `path/to/code`.
+```
+
+## The Ruff Formatter
+The Ruff formatter is an extremely fast Python code formatter designed as a drop-in replacement for [Black](https://pypi.org/project/black/), available as part of the `ruff` CLI via `ruff format`.
+
+### `ruff format`
+`ruff format` is the primary entrypoint to the formatter. It accepts a list of files or directories, and formats all discovered Python files:
+
+```shell
+ruff format                   # Format all files in the current directory.
+ruff format path/to/code/     # Format all files in `path/to/code` (and any subdirectories).
+ruff format path/to/file.py   # Format a single file.
+```
+
+Similar to Black, running `ruff format /path/to/file.py` will format the given file or directory in-place, while `ruff format --check /path/to/file.py` will avoid writing any formatted files back, and instead exit with a non-zero status code upon detecting any unformatted files.
+
+For the full list of supported options, run `ruff format --help`.
+
+## Configuration
+ruff can be configured via `ruff.toml` config file. See [here](https://docs.astral.sh/ruff/settings/) for a reference of all config parameters.