abs-file-macro

OS	Status
Ubuntu-latest
macOS-latest
Windows-latest

A macro that returns the absolute file path of the Rust source file in which it is invoked.

This macro ensures that the correct absolute path is resolved, even when used within a Cargo workspace or a nested crate. It prevents issues with duplicated path segments by properly handling the crate root.

Install

cargo add abs-file-macro

Usage

Example

use abs_file_macro::abs_file;

let path = abs_file!();

assert!(
    std::fs::metadata(&path).is_ok(),
    "abs_file!() should point to a real file, but {:?} does not exist",
    path
);

Testing

To ensure correctness, test this macro in two ways:

1. As part of the full workspace

   cargo test --workspace
   

   This verifies that the macro functions correctly across all workspace members.

2. Within an individual workspace member

   cd test-workspace-1
   cargo test
   

   This ensures that the macro works independently within a single workspace member.

License

MIT License (c) 2025 Jeremy Harris.