Move flake8-to-ruff to a separate crate (#528)

crates/flake8_to_ruff/src/main.rs

@@ -0,0 +1,35 @@
+//! Utility to generate Ruff's pyproject.toml section from a Flake8 INI file.
+
+use std::path::PathBuf;
+
+use anyhow::Result;
+use clap::Parser;
+use configparser::ini::Ini;
+
+use flake8_to_ruff::converter;
+
+#[derive(Parser)]
+#[command(
+    about = "Convert existing Flake8 configuration to Ruff.",
+    long_about = None
+)]
+struct Cli {
+    /// Path to the Flake8 configuration file (e.g., 'setup.cfg', 'tox.ini', or '.flake8').
+    #[arg(required = true)]
+    file: PathBuf,
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    // Read the INI file.
+    let mut ini = Ini::new_cs();
+    ini.set_multiline(true);
+    let config = ini.load(cli.file).map_err(|msg| anyhow::anyhow!(msg))?;
+
+    // Create the pyproject.toml.
+    let pyproject = converter::convert(config)?;
+    println!("{}", toml::to_string(&pyproject)?);
+
+    Ok(())
+}