use anyhow::Result;
use std::path::{Path, PathBuf};

pub fn discover(recipe_dir: &Path) -> Result<Vec<PathBuf>> {
    let patch_dir = recipe_dir.join("patches");
    if !patch_dir.exists() {
        return Ok(Vec::new());
    }
    let mut patches = Vec::new();
    for entry in std::fs::read_dir(&patch_dir)? {
        let entry = entry?;
        let path = entry.path();
        if path.extension().and_then(|ext| ext.to_str()) == Some("patch") {
            patches.push(path);
        }
    }
    patches.sort();
    Ok(patches)
}