Most of the refactor. Need to switch machines.

crates/fs/src/lib.rs

@@ -0,0 +1,24 @@
+use std::path::{Path, PathBuf};
+
+pub const EXT_TOML: &str = ".toml";
+pub const EXT_LOCK: &str = ".lock";
+
+pub fn expand_files<P: AsRef<Path>>(path: P) -> std::io::Result<Vec<PathBuf>> {
+    let path = path.as_ref();
+
+    if path.is_file() {
+        return Ok(vec![path.to_path_buf()]);
+    }
+
+    Ok(std::fs::read_dir(path)?
+        .filter_map(|entry| {
+            let path = entry.ok()?.path();
+            if path.is_dir() {
+                Some(expand_files(path).ok()?)
+            } else {
+                Some(vec![path])
+            }
+        })
+        .flatten()
+        .collect())
+}