Trying something silly with iterators

yielddirs/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "yielddirs"
+version = "0.1.0"

yielddirs/Cargo.toml

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+[package]
+name = "yielddirs"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

yielddirs/README.md

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+# YieldDirs
+
+Trying to make an iterator over the filesystem, which spews out some specific
+directories.

yielddirs/src/main.rs

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+use std::fs::ReadDir;
+use std::path::Path;
+use std::path::PathBuf;
+
+struct Walker {
+    path: PathBuf
+}
+
+impl Walker {
+    pub fn new(base: &Path) -> Self {
+        println!("base={base:?}");
+        println!("is_dir={}", base.is_dir());
+        Self { path: base.to_path_buf()}
+    }
+
+    pub fn children(&self) -> WalkerIterator {
+        WalkerIterator::new(&self.path)
+    }
+}
+
+struct WalkerIterator {
+    walking: ReadDir
+}
+
+impl WalkerIterator {
+    fn new(path: &Path) -> Self {
+        Self {
+            walking: path.read_dir().unwrap()
+        }
+    }
+}
+
+impl Iterator for WalkerIterator {
+    type Item = String;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let current = self.walking.next()?;
+        Some(current.unwrap().file_name().to_string_lossy().to_string())
+    }
+}
+
+fn main() {
+    let mut args = std::env::args();
+    let _ = args.next();
+    let base_path = args.next().unwrap();
+
+    let walker = Walker::new(&Path::new(&base_path).canonicalize().unwrap());
+    for child in walker.children() {
+        println!("{child}");
+    }
+}