feat: ruff (#41)

README.md

@@ -187,6 +187,7 @@ To view configured and available formatters, as well as to see the path to the l
 - [prettierd](https://github.com/fsouza/prettierd) - prettier, as a daemon, for ludicrous formatting speed.
 - [rubocop](https://github.com/rubocop/rubocop) - Ruby static code analyzer and formatter, based on the community Ruby style guide.
 - [rustfmt](https://github.com/rust-lang/rustfmt) - A tool for formatting rust code according to style guidelines.
+- [ruff](https://github.com/astral-sh/ruff) - An extremely fast Python linter, written in Rust.
 - [scalafmt](https://github.com/scalameta/scalafmt) - Code formatter for Scala.
 - [shellharden](https://github.com/anordal/shellharden) - The corrective bash syntax highlighter
 - [shfmt](https://github.com/mvdan/sh) - A shell parser, formatter, and interpreter with `bash` support.

lua/conform/formatters/ruff.lua

@@ -0,0 +1,19 @@
+return {
+  meta = {
+    url = "https://beta.ruff.rs/docs/",
+    description = "An extremely fast Python linter, written in Rust.",
+  },
+  command = "ruff",
+  args = {
+    "--fix",
+    "-e",
+    "-n",
+    "--stdin-filename",
+    "$FILENAME",
+    "-",
+  },
+  stdin = true,
+  cwd = require("conform.util").root_file({
+    "pyproject.toml",
+  }),
+}