fix(lsp): package resolution on save (#3794)

# Description

## Problem\*

## Summary\*

While saving file - procedure of compiling package should be applied to
single package rather than all packages available in workspace.


## Additional Context



## Documentation\*

Check one:
- [x] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[Exceptional Case]** Documentation to be submitted in a separate
PR.

# PR Checklist\*

- [x] I have tested the changes locally.
- [x] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

tooling/lsp/src/notifications/mod.rs

@@ -2,7 +2,7 @@ use std::ops::ControlFlow;
 
 use async_lsp::{ErrorCode, LanguageClient, ResponseError};
 use nargo::prepare_package;
-use nargo_toml::{find_package_manifest, resolve_workspace_from_toml, PackageSelection};
+use nargo_toml::{find_file_manifest, resolve_workspace_from_toml, PackageSelection};
 use noirc_driver::{check_crate, NOIR_ARTIFACT_VERSION_STRING};
 use noirc_errors::{DiagnosticKind, FileDiagnostic};
 
@@ -69,29 +69,21 @@ pub(super) fn on_did_save_text_document(
         }
     };
 
-    let root_path = match &state.root_path {
-        Some(root) => root,
-        None => {
-            return ControlFlow::Break(Err(ResponseError::new(
-                ErrorCode::REQUEST_FAILED,
-                "Could not find project root",
-            )
-            .into()));
-        }
-    };
+    let package_root = find_file_manifest(file_path.as_path());
 
-    let toml_path = match find_package_manifest(root_path, &file_path) {
-        Ok(toml_path) => toml_path,
-        Err(err) => {
+    let toml_path = match package_root {
+        Some(toml_path) => toml_path,
+        None => {
             // If we cannot find a manifest, we log a warning but return no diagnostics
             // We can reconsider this when we can build a file without the need for a Nargo.toml file to resolve deps
             let _ = state.client.log_message(LogMessageParams {
                 typ: MessageType::WARNING,
-                message: format!("{err}"),
+                message: format!("Nargo.toml not found for file: {:}", file_path.display()),
             });
             return ControlFlow::Continue(());
         }
     };
+
     let workspace = match resolve_workspace_from_toml(
         &toml_path,
         PackageSelection::All,

tooling/nargo_toml/src/lib.rs

@@ -24,6 +24,27 @@ mod semver;
 pub use errors::ManifestError;
 use git::clone_git_repo;
 
+/// Searches for a `Nargo.toml` file in the current directory and all parent directories.
+/// For example, if the current directory is `/workspace/package/src`, then this function
+/// will search for a `Nargo.toml` file in
+/// * `/workspace/package/src`,
+/// * `/workspace/package`,
+/// * `/workspace`.
+///
+/// Returns the [PathBuf] of the `Nargo.toml` file if found, otherwise returns None.
+///
+/// It will return innermost `Nargo.toml` file, which is the one closest to the current directory.
+/// For example, if the current directory is `/workspace/package/src`, then this function
+/// will return the `Nargo.toml` file in `/workspace/package/Nargo.toml`
+pub fn find_file_manifest(current_path: &Path) -> Option<PathBuf> {
+    for path in current_path.ancestors() {
+        if let Ok(toml_path) = get_package_manifest(path) {
+            return Some(toml_path);
+        }
+    }
+    None
+}
+
 /// Returns the [PathBuf] of the directory containing the `Nargo.toml` by searching from `current_path` to the root of its [Path].
 ///
 /// Returns a [ManifestError] if no parent directories of `current_path` contain a manifest file.