#path #dot #absolute #canonical #dedot

path-absolutize

A library for extending Path and PathBuf in order to get an absolute path and remove the containing dots

19 stable releases

✓ Uses Rust 2018 edition

new 3.0.3 Jul 6, 2020
2.0.2 May 27, 2020
1.2.1 May 26, 2020
1.2.0 Feb 22, 2020
1.1.3 Nov 15, 2018

#10 in Filesystem

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2,936 downloads per month
Used in 15 crates (14 directly)

MIT license

27KB
400 lines

Path Absolutize

Build Status

This is a library for extending Path and PathBuf in order to get an absolute path and remove the containing dots.

The difference between absolutize and canonicalize methods is that absolutize does not care about whether the file exists and what the file really is.

Please read the following examples to know the parsing rules.

Examples

There are two methods you can use.

absolutize

Get an absolute path.

The dots in a path will be parsed even if it is already an absolute path (which means the path starts with a MAIN_SEPARATOR on Unix-like systems).

extern crate path_absolutize;

use std::path::Path;

use path_absolutize::*;

let p = Path::new("/path/to/123/456");

assert_eq!("/path/to/123/456", p.absolutize().unwrap().to_str().unwrap());
extern crate path_absolutize;

use std::path::Path;

use path_absolutize::*;

let p = Path::new("/path/to/./123/../456");

assert_eq!("/path/to/456", p.absolutize().unwrap().to_str().unwrap());

If a path starts with a single dot, the dot means your program's current working directory (CWD).

extern crate path_absolutize;

use std::path::Path;
use std::env;

use path_absolutize::*;

let p = Path::new("./path/to/123/456");

assert_eq!(Path::join(env::current_dir().unwrap().as_path(), Path::new("path/to/123/456")).to_str().unwrap(), p.absolutize().unwrap().to_str().unwrap());

If a path starts with a pair of dots, the dots means the parent of the CWD. If the CWD is root, the parent is still root.

extern crate path_absolutize;

use std::path::Path;
use std::env;

use path_absolutize::*;

let p = Path::new("../path/to/123/456");

let cwd = env::current_dir().unwrap();

let cwd_parent = cwd.parent();

match cwd_parent {
   Some(cwd_parent) => {
       assert_eq!(Path::join(&cwd_parent, Path::new("path/to/123/456")).to_str().unwrap(), p.absolutize().unwrap().to_str().unwrap());
   }
   None => {
       assert_eq!(Path::join(Path::new("/"), Path::new("path/to/123/456")).to_str().unwrap(), p.absolutize().unwrap().to_str().unwrap());
   }
}

A path which does not start with a MAIN_SEPARATOR, Single Dot and Double Dots, will act like having a single dot at the start when absolutize method is used.

extern crate path_absolutize;

use std::path::Path;
use std::env;

use path_absolutize::*;

let p = Path::new("path/to/123/456");

assert_eq!(Path::join(env::current_dir().unwrap().as_path(), Path::new("path/to/123/456")).to_str().unwrap(), p.absolutize().unwrap().to_str().unwrap());
extern crate path_absolutize;

use std::path::Path;
use std::env;

use path_absolutize::*;

let p = Path::new("path/../../to/123/456");

let cwd = env::current_dir().unwrap();

let cwd_parent = cwd.parent();

match cwd_parent {
   Some(cwd_parent) => {
       assert_eq!(Path::join(&cwd_parent, Path::new("to/123/456")).to_str().unwrap(), p.absolutize().unwrap().to_str().unwrap());
   }
   None => {
       assert_eq!(Path::join(Path::new("/"), Path::new("to/123/456")).to_str().unwrap(), p.absolutize().unwrap().to_str().unwrap());
   }
}

absolutize_virtually

Get an absolute path only under a specific directory.

The dots in a path will be parsed even if it is already an absolute path (which means the path starts with a MAIN_SEPARATOR on Unix-like systems).

extern crate path_absolutize;

use std::path::Path;

use path_absolutize::*;

let p = Path::new("/path/to/123/456");

assert_eq!("/path/to/123/456", p.absolutize_virtually("/").unwrap().to_str().unwrap());
extern crate path_absolutize;

use std::path::Path;

use path_absolutize::*;

let p = Path::new("/path/to/./123/../456");

assert_eq!("/path/to/456", p.absolutize_virtually("/").unwrap().to_str().unwrap());

Every absolute path should under the virtual root.

extern crate path_absolutize;

use std::path::Path;

use std::io::ErrorKind;

use path_absolutize::*;

let p = Path::new("/path/to/123/456");

assert_eq!(ErrorKind::InvalidInput, p.absolutize_virtually("/virtual/root").unwrap_err().kind());

Every relative path should under the virtual root.

extern crate path_absolutize;

use std::path::Path;

use std::io::ErrorKind;

use path_absolutize::*;

let p = Path::new("./path/to/123/456");

assert_eq!(ErrorKind::InvalidInput, p.absolutize_virtually("/virtual/root").unwrap_err().kind());
extern crate path_absolutize;

use std::path::Path;

use std::io::ErrorKind;

use path_absolutize::*;

let p = Path::new("../path/to/123/456");

assert_eq!(ErrorKind::InvalidInput, p.absolutize_virtually("/virtual/root").unwrap_err().kind());

A path which does not start with a MAIN_SEPARATOR, Single Dot and Double Dots, will be located in the virtual root after the absolutize_virtually method is used.

extern crate path_absolutize;

use std::path::Path;

use path_absolutize::*;

let p = Path::new("path/to/123/456");

assert_eq!("/virtual/root/path/to/123/456", p.absolutize_virtually("/virtual/root").unwrap().to_str().unwrap());
extern crate path_absolutize;

use std::path::Path;

use path_absolutize::*;

let p = Path::new("path/to/../../../../123/456");

assert_eq!("/virtual/root/123/456", p.absolutize_virtually("/virtual/root").unwrap().to_str().unwrap());

Caching

By default, the absolutize method and the absolutize_virtually method create a new PathBuf instance of the CWD every time in their operation. Although it allows us to safely change the CWD at runtime by the program itself (e.g. using the std::env::set_current_dir function) or outside controls (e.g. using gdb to call chdir), we don't need that in most cases.

In order to parse paths with better performance, this crate provides two ways to cache the CWD.

lazy_static_cache

Enabling the lazy_static_cache feature can let this crate use lazy_static to cache the CWD. It's thread-safe and does not need to modify any code, but once the CWD is cached, it cannot be changed anymore at runtime.

[dependencies.path-absolutize]
version = "*"
features = ["lazy_static_cache"]

unsafe_cache

Enabling the unsafe_cache feature can let this crate use a mutable static variable to cache the CWD. It allows the program to change the CWD at runtime by the program itself, but it's not thread-safe.

You need to use the update_cwd function to initialize the CWD first. The function should also be used to update the CWD after the CWD is changed.

[dependencies.path-absolutize]
version = "*"
features = ["unsafe_cache"]
extern crate path_absolutize;

use std::path::Path;

use path_absolutize::*;

unsafe {
    update_cwd();
}

let p = Path::new("./path/to/123/456");

println!("{}", p.absolutize().unwrap().to_str().unwrap());

std::env::set_current_dir("/").unwrap();

unsafe {
    update_cwd();
}

println!("{}", p.absolutize().unwrap().to_str().unwrap());

Benchmark

No-cache

cargo bench

lazy_static_cache

cargo bench --features lazy_static_cache

unsafe_cache

cargo bench --features unsafe_cache

Crates.io

https://crates.io/crates/path-absolutize

Documentation

https://docs.rs/path-absolutize

License

MIT

Dependencies

~34KB