How can I open VS Code’s side-by-side diff view (staged vs. working copy) from a single terminal command?

Repository State

I have a git repository located in ~/Desktop/ML/Books. In this repo, I've made a series of edits to a file (main.rs) as follows:

1. Initially, I modified main.rs, staged it, and committed those changes.
2. Later, I made further modifications to main.rs and staged those changes.
3. Then, I modified main.rs again (leaving the file unstaged).

Walkthrough of non-automated viewing of diff

When I open VS Code (using, for example, the command code ProgrammingRust/projs/actix-gcd/src/main.rs) and click the "Open Changes" button, I see a visual side-by-side comparison of the file’s staged content versus the latest edits in the working copy.

What I have tried

I've configured my global git settings (in ~/.gitconfig) to use VS Code as my difftool.

However, when I run the command:

git difftool ProgrammingRust/projs/actix-gcd/src/main.rs

instead of showing a comparison between the staged and unstaged versions, it compares the current file with an unexpected "unknown" file (as seen in the attached screenshot of paths).

Request

What I need is to automate this diff view – that is, have a single terminal command (or a small set of commands) that directly opens the VS Code side-by-side diff view comparing the staged version of main.rs against its working copy without any extra clicks in the GUI.

How can I configure or invoke git difftool (or another command) to achieve this behavior?

Fixed it by adding --wait argument to the command in the .gitconfig file (or ./.git/config file for local change). Like:

[diff]
    tool = vscode
[difftool "vscode"]
    cmd = code --wait --diff $LOCAL $REMOTE

Then running the following command:

git difftool --no-prompt --tool=vscode ProgrammingRust/projs/actix-gcd/src/main.rs