Playing with some path structure

pathextractiontest/Cargo.lock

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

pathextractiontest/Cargo.toml

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+[package]
+name = "pathextractiontest"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

pathextractiontest/README.md

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+# PathExtractTest
+
+Extracts some information from a directory based on its structure.
+
+The basic gist is:
+
+- There is a magic directory, called ".run".
+- Things go as "something/.run" or "something/.run/special/path".
+- If we send "something/.run", we need to get a pair with path "something" and
+  the name "default";
+- If we send "something/.run/special/path", we need to get a pair with path
+  "something and the name "path.

pathextractiontest/src/main.rs

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+use std::path::Path;
+
+fn extract<'a>(
+    path: &'a Path,
+    current_name: Option<&'a str>,
+) -> Option<(&'a Path, Option<&'a str>)> {
+    let name = path.file_name().map(|x| x.to_str()).flatten();
+    let parent = path.parent()?;
+
+    // println!("path={path:?}, current_name={current_name:?}, parent={parent:?}, name={name:?}");
+
+    if name == Some(".run") {
+        Some((parent, current_name.or(Some("default"))))
+    } else {
+        extract(&parent, current_name.or(name))
+    }
+}
+
+fn main() {
+    println!("Hello, world!");
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn base() {
+        let result = extract(Path::new("something/.run"), None).unwrap();
+        assert_eq!(result.0, Path::new("something"));
+        assert_eq!(result.1, Some("default"));
+    }
+    
+    #[test]
+    fn child() {
+        let result = extract(Path::new("something/.run/special/path"), None).unwrap();
+        assert_eq!(result.0, Path::new("something"));
+        assert_eq!(result.1, Some("path"));
+    }
+
+    #[test]
+    fn broken() {
+        let result = extract(Path::new("something/fun/for/everyone"), None);
+        assert!(result.is_none());
+    }
+}