fix: incorrect config_root for project/.mise/config.toml

src/config/config_file/mise_toml.rs

@@ -93,7 +93,7 @@ pub struct EnvList(pub(crate) Vec<EnvDirective>);
 impl MiseToml {
     pub fn init(path: &Path) -> Self {
         let mut context = BASE_CONTEXT.clone();
-        context.insert("config_root", path.parent().unwrap().to_str().unwrap());
+        context.insert("config_root", get_config_root(path).to_str().unwrap());
         Self {
             path: path.to_path_buf(),
             context,
@@ -514,6 +514,30 @@ impl ConfigFile for MiseToml {
     }
 }
 
+/// Returns the root path of the config directory.
+/// If the config directory is nested, this will return the top-most directory.
+/// For example
+/// ```text
+/// /src/myproj/mise.toml                   -> /src/myproj
+/// /src/myproj/mise/config.toml            -> /src/myproj
+/// /src/myproj/.mise/config.toml           -> /src/myproj
+/// /src/myproj/.config/mise/config.toml    -> /src/myproj
+/// /src/myproj/.config/mise/conf.d/a.toml  -> /src/myproj
+/// ```
+fn get_config_root(path: &Path) -> PathBuf {
+    let is_config_dir = |p: &Path| {
+        p.ends_with("mise")
+            || p.ends_with(".mise")
+            || p.ends_with(".config")
+            || p.ends_with("conf.d")
+    };
+    let mut config_root = path.to_path_buf();
+    while is_config_dir(&config_root) {
+        config_root.pop();
+    }
+    config_root
+}
+
 /// Returns a [`toml_edit::Key`] from the given `key`.
 /// Preserves any surrounding whitespace (e.g. comments) if the key already exists in the provided [`toml_edit::Table`].
 fn get_key_with_decor(table: &toml_edit::Table, key: &str) -> Key {
@@ -1813,6 +1837,23 @@ mod tests {
         ");
     }
 
+    #[test]
+    fn test_get_config_root() {
+        let cases = vec![
+            ("/src/myproj/mise.toml", "/src/myproj"),
+            ("/src/myproj/mise/config.toml", "/src/myproj"),
+            ("/src/myproj/.mise/config.toml", "/src/myproj"),
+            ("/src/myproj/.config/mise/config.toml", "/src/myproj"),
+            ("/src/myproj/.config/mise/conf.d/a.toml", "/src/myproj"),
+        ];
+
+        for (input, expected) in cases {
+            let input_path = Path::new(input);
+            let expected_path = Path::new(expected);
+            assert_eq!(get_config_root(input_path.parent().unwrap()), expected_path);
+        }
+    }
+
     fn parse(s: String) -> MiseToml {
         let p = CWD.as_ref().unwrap().join(".test.mise.toml");
         file::write(&p, s).unwrap();