Function no_std_compat::path::absolute

pub fn absolute<P>(path: P) -> Result<PathBuf, Error>
where
    P: AsRef<Path>,

Makes the path absolute without accessing the filesystem.

If the path is relative, the current directory is used as the base directory. All intermediate components will be resolved according to platform-specific rules, but unlike canonicalize, this does not resolve symlinks and may succeed even if the path does not exist.

If the path is empty or getting the current directory fails, then an error will be returned.

Platform-specific behavior

On POSIX platforms, the path is resolved using POSIX semantics, except that it stops short of resolving symlinks. This means it will keep .. components and trailing slashes.

On Windows, for verbatim paths, this will simply return the path as given. For other paths, this is currently equivalent to calling GetFullPathNameW.

Note that these may change in the future.

Errors

This function may return an error in the following situations:

• If path is syntactically invalid; in particular, if it is empty.
• If getting the current directory fails.

Examples

POSIX paths

fn main() -> std::io::Result<()> {
    use std::path::{self, Path};

    // Relative to absolute
    let absolute = path::absolute("foo/./bar")?;
    assert!(absolute.ends_with("foo/bar"));

    // Absolute to absolute
    let absolute = path::absolute("/foo//test/.././bar.rs")?;
    assert_eq!(absolute, Path::new("/foo/test/../bar.rs"));
    Ok(())
}

Windows paths

fn main() -> std::io::Result<()> {
    use std::path::{self, Path};

    // Relative to absolute
    let absolute = path::absolute("foo/./bar")?;
    assert!(absolute.ends_with(r"foo\bar"));

    // Absolute to absolute
    let absolute = path::absolute(r"C:\foo//test\..\./bar.rs")?;

    assert_eq!(absolute, Path::new(r"C:\foo\bar.rs"));
    Ok(())
}

Note that this may change in the future.