ruff-tools 0.1.0

A collection of powerful tools built on top of Astral's ruff
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use regex::Regex;
use std::collections::HashMap;
use std::collections::HashSet;
use std::process::Command;
use std::str;

use serde_json::Value;

pub(crate) fn ruff_graph(
    as_pkgs: bool,
    as_dependents: bool,
    paths: Option<Vec<String>>,
) -> HashMap<String, HashSet<String>> {
    let graph_output = Command::new("ruff")
        .args(["analyze", "graph", "--preview"])
        .args(if as_dependents {
            Vec::<&str>::new()
        } else {
            vec!["--direction", "dependents"]
        })
        .args(paths.unwrap_or_default())
        .output()
        .expect("failed to execute process");

    let j: Value =
        serde_json::from_str::<Value>(str::from_utf8(&graph_output.stdout).unwrap()).unwrap();

    j.as_object()
        .unwrap()
        .clone()
        .into_iter()
        // once https://github.com/astral-sh/ruff/issues/13431 is implemented, we don't need
        // path_to_module anymore
        .map(|(k, v)| {
            if as_pkgs {
                (
                    path_to_module(&k),
                    v.as_array()
                        .unwrap()
                        .iter()
                        .map(|i| path_to_module(i.as_str().unwrap()))
                        .collect::<HashSet<_>>(),
                )
            } else {
                (
                    k,
                    v.as_array()
                        .unwrap()
                        .iter()
                        .map(|i| i.as_str().unwrap().to_string())
                        .collect::<HashSet<_>>(),
                )
            }
        })
        .collect::<HashMap<_, _>>()
}

fn path_to_module(path: &str) -> String {
    // this by no means fully PEP-compliant, and does not work for flat layouts or custom
    // package organization; it works for default src-layouts only
    let _module_path_with_extensions = path.replace("/__init__.py", "").replace("/", ".");
    let full_module_path: String = Regex::new(r"\.py$")
        .unwrap()
        .replace(&_module_path_with_extensions, "")
        .into();
    match full_module_path.find("src.") {
        Some(src_index) => {
            let start_index = src_index + 4; // "src.".len()
            full_module_path[start_index..].to_string()
        }
        None => full_module_path,
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_path_to_module() {
        assert_eq!(path_to_module("foo/src/foo/bar.py"), "foo.bar");
        assert_eq!(path_to_module("foo/src/foo/bar/__init__.py"), "foo.bar");
        assert_eq!(path_to_module("foo/src/foo/__init__.py"), "foo");
    }
}