I think I finished it...

crates/core/src/nest.rs

@@ -5,8 +5,8 @@ use std::path::{Path, PathBuf};
 
 use serde::{Deserialize, Serialize};
 
+use crate::dependency::Dependency;
 use crate::meta::Meta;
-use crate::prelude::Dependency;
 use crate::workspace::Workspace;
 
 pub const F_NEST_TOML: &str = "Nest.toml";
@@ -30,6 +30,11 @@ impl Nest {
     }
 
     pub fn write<P: AsRef<Path>>(&self, path: P) -> crate::Result<()> {
+        let mut path = path.as_ref().to_path_buf();
+        if path.is_dir() {
+            path = path.join(F_NEST_TOML);
+        }
+
         Ok(OpenOptions::new()
             .write(true)
             .create(true)