[][src]Struct async_std::path::PathBuf

pub struct PathBuf { /* fields omitted */ }

This struct is an async version of std::path::PathBuf.

Methods

impl PathBuf[src]

pub fn new() -> PathBuf[src]

Allocates an empty PathBuf.

Examples

use async_std::path::PathBuf;

let path = PathBuf::new();

pub fn as_path(&self) -> &Path[src]

Coerces to a Path slice.

Examples

use async_std::path::{Path, PathBuf};

let p = PathBuf::from("/test");
assert_eq!(Path::new("/test"), p.as_path());

pub fn push<P: AsRef<Path>>(&mut self, path: P)[src]

Extends self with path.

If path is absolute, it replaces the current path.

On Windows:

  • if path has a root but no prefix (e.g., \windows), it replaces everything except for the prefix (if any) of self.
  • if path has a prefix but no root, it replaces self.

Examples

Pushing a relative path extends the existing path:

use async_std::path::PathBuf;

let mut path = PathBuf::from("/tmp");
path.push("file.bk");
assert_eq!(path, PathBuf::from("/tmp/file.bk"));

Pushing an absolute path replaces the existing path:

use async_std::path::PathBuf;

let mut path = PathBuf::from("/tmp");
path.push("/etc");
assert_eq!(path, PathBuf::from("/etc"));

pub fn pop(&mut self) -> bool[src]

Truncates self to self.parent.

Returns false and does nothing if self.parent is None. Otherwise, returns true.

Examples

use async_std::path::{Path, PathBuf};

let mut p = PathBuf::from("/test/test.rs");

p.pop();
assert_eq!(Path::new("/test"), p.as_ref());
p.pop();
assert_eq!(Path::new("/"), p.as_ref());

pub fn set_file_name<S: AsRef<OsStr>>(&mut self, file_name: S)[src]

Updates self.file_name to file_name.

If self.file_name was None, this is equivalent to pushing file_name.

Otherwise it is equivalent to calling pop and then pushing file_name. The new path will be a sibling of the original path. (That is, it will have the same parent.)

Examples

use async_std::path::PathBuf;

let mut buf = PathBuf::from("/");
assert!(buf.file_name() == None);
buf.set_file_name("bar");
assert!(buf == PathBuf::from("/bar"));
assert!(buf.file_name().is_some());
buf.set_file_name("baz.txt");
assert!(buf == PathBuf::from("/baz.txt"));

pub fn set_extension<S: AsRef<OsStr>>(&mut self, extension: S) -> bool[src]

Updates self.extension to extension.

Returns false and does nothing if self.file_name is None, returns true and updates the extension otherwise.

If self.extension is None, the extension is added; otherwise it is replaced.

Examples

use async_std::path::{Path, PathBuf};

let mut p = PathBuf::from("/feel/the");

p.set_extension("force");
assert_eq!(Path::new("/feel/the.force"), p.as_path());

p.set_extension("dark_side");
assert_eq!(Path::new("/feel/the.dark_side"), p.as_path());

pub fn into_os_string(self) -> OsString[src]

Consumes the PathBuf, yielding its internal OsString storage.

Examples

use async_std::path::PathBuf;

let p = PathBuf::from("/the/head");
let os_str = p.into_os_string();

pub fn into_boxed_path(self) -> Box<Path>[src]

Converts this PathBuf into a boxed Path.

Methods from Deref<Target = Path>

pub fn as_os_str(&self) -> &OsStr[src]

Yields the underlying OsStr slice.

pub fn to_str(&self) -> Option<&str>[src]

Yields a &str slice if the Path is valid unicode.

This conversion may entail doing a check for UTF-8 validity. Note that validation is performed because non-UTF-8 strings are perfectly valid for some OS.

Examples

use async_std::path::Path;

let path = Path::new("foo.txt");
assert_eq!(path.to_str(), Some("foo.txt"));

pub fn to_string_lossy(&self) -> Cow<str>[src]

Converts a Path to a Cow<str>.

Any non-Unicode sequences are replaced with U+FFFD REPLACEMENT CHARACTER.

Examples

Calling to_string_lossy on a Path with valid unicode:

use async_std::path::Path;

let path = Path::new("foo.txt");
assert_eq!(path.to_string_lossy(), "foo.txt");

Had path contained invalid unicode, the to_string_lossy call might have returned "fo�.txt".

pub fn to_path_buf(&self) -> PathBuf[src]

Converts a Path to an owned PathBuf.

Examples

use async_std::path::{Path, PathBuf};

let path_buf = Path::new("foo.txt").to_path_buf();
assert_eq!(path_buf, PathBuf::from("foo.txt"));

pub fn is_absolute(&self) -> bool[src]

Returns true if the Path is absolute, i.e., if it is independent of the current directory.

  • On Unix, a path is absolute if it starts with the root, so is_absolute and has_root are equivalent.

  • On Windows, a path is absolute if it has a prefix and starts with the root: c:\windows is absolute, while c:temp and \temp are not.

Examples

use async_std::path::Path;

assert!(!Path::new("foo.txt").is_absolute());

pub fn is_relative(&self) -> bool[src]

Returns true if the Path is relative, i.e., not absolute.

See is_absolute's documentation for more details.

Examples

use async_std::path::Path;

assert!(Path::new("foo.txt").is_relative());

pub fn has_root(&self) -> bool[src]

Returns true if the Path has a root.

  • On Unix, a path has a root if it begins with /.

  • On Windows, a path has a root if it:

    • has no prefix and begins with a separator, e.g., \windows
    • has a prefix followed by a separator, e.g., c:\windows but not c:windows
    • has any non-disk prefix, e.g., \\server\share

Examples

use async_std::path::Path;

assert!(Path::new("/etc/passwd").has_root());

pub fn parent(&self) -> Option<&Path>[src]

Returns the Path without its final component, if there is one.

Returns None if the path terminates in a root or prefix.

Examples

use async_std::path::Path;

let path = Path::new("/foo/bar");
let parent = path.parent().unwrap();
assert_eq!(parent, Path::new("/foo"));

let grand_parent = parent.parent().unwrap();
assert_eq!(grand_parent, Path::new("/"));
assert_eq!(grand_parent.parent(), None);

pub fn ancestors(&self) -> Ancestors[src]

Produces an iterator over Path and its ancestors.

The iterator will yield the Path that is returned if the parent method is used zero or more times. That means, the iterator will yield &self, &self.parent().unwrap(), &self.parent().unwrap().parent().unwrap() and so on. If the parent method returns None, the iterator will do likewise. The iterator will always yield at least one value, namely &self.

Examples

use async_std::path::Path;

let mut ancestors = Path::new("/foo/bar").ancestors();
assert_eq!(ancestors.next(), Some(Path::new("/foo/bar").into()));
assert_eq!(ancestors.next(), Some(Path::new("/foo").into()));
assert_eq!(ancestors.next(), Some(Path::new("/").into()));
assert_eq!(ancestors.next(), None);

pub fn file_name(&self) -> Option<&OsStr>[src]

Returns the final component of the Path, if there is one.

If the path is a normal file, this is the file name. If it's the path of a directory, this is the directory name.

Returns None if the path terminates in ...

Examples

use async_std::path::Path;
use std::ffi::OsStr;

assert_eq!(Some(OsStr::new("bin")), Path::new("/usr/bin/").file_name());
assert_eq!(Some(OsStr::new("foo.txt")), Path::new("tmp/foo.txt").file_name());
assert_eq!(Some(OsStr::new("foo.txt")), Path::new("foo.txt/.").file_name());
assert_eq!(Some(OsStr::new("foo.txt")), Path::new("foo.txt/.//").file_name());
assert_eq!(None, Path::new("foo.txt/..").file_name());
assert_eq!(None, Path::new("/").file_name());

pub fn strip_prefix<P>(&self, base: P) -> Result<&Path, StripPrefixError> where
    P: AsRef<Path>, 
[src]

Returns a path that, when joined onto base, yields self.

Errors

If base is not a prefix of self (i.e., starts_with returns false), returns Err.

Examples

use async_std::path::{Path, PathBuf};

let path = Path::new("/test/haha/foo.txt");

assert_eq!(path.strip_prefix("/"), Ok(Path::new("test/haha/foo.txt")));
assert_eq!(path.strip_prefix("/test"), Ok(Path::new("haha/foo.txt")));
assert_eq!(path.strip_prefix("/test/"), Ok(Path::new("haha/foo.txt")));
assert_eq!(path.strip_prefix("/test/haha/foo.txt"), Ok(Path::new("")));
assert_eq!(path.strip_prefix("/test/haha/foo.txt/"), Ok(Path::new("")));
assert_eq!(path.strip_prefix("test").is_ok(), false);
assert_eq!(path.strip_prefix("/haha").is_ok(), false);

let prefix = PathBuf::from("/test/");
assert_eq!(path.strip_prefix(prefix), Ok(Path::new("haha/foo.txt")));

pub fn starts_with<P: AsRef<Path>>(&self, base: P) -> bool[src]

Determines whether base is a prefix of self.

Only considers whole path components to match.

Examples

use async_std::path::Path;

let path = Path::new("/etc/passwd");

assert!(path.starts_with("/etc"));
assert!(path.starts_with("/etc/"));
assert!(path.starts_with("/etc/passwd"));
assert!(path.starts_with("/etc/passwd/"));

assert!(!path.starts_with("/e"));

pub fn ends_with<P: AsRef<Path>>(&self, child: P) -> bool[src]

Determines whether child is a suffix of self.

Only considers whole path components to match.

Examples

use async_std::path::Path;

let path = Path::new("/etc/passwd");

assert!(path.ends_with("passwd"));

pub fn file_stem(&self) -> Option<&OsStr>[src]

Extracts the stem (non-extension) portion of self.file_name.

The stem is:

  • None, if there is no file name;
  • The entire file name if there is no embedded .;
  • The entire file name if the file name begins with . and has no other .s within;
  • Otherwise, the portion of the file name before the final .

Examples

use async_std::path::Path;

let path = Path::new("foo.rs");

assert_eq!("foo", path.file_stem().unwrap());

pub fn extension(&self) -> Option<&OsStr>[src]

Extracts the extension of self.file_name, if possible.

The extension is:

  • None, if there is no file name;
  • None, if there is no embedded .;
  • None, if the file name begins with . and has no other .s within;
  • Otherwise, the portion of the file name after the final .

Examples

use async_std::path::Path;

let path = Path::new("foo.rs");

assert_eq!("rs", path.extension().unwrap());

pub fn join<P: AsRef<Path>>(&self, path: P) -> PathBuf[src]

Creates an owned PathBuf with path adjoined to self.

See PathBuf::push for more details on what it means to adjoin a path.

Examples

use async_std::path::{Path, PathBuf};

assert_eq!(Path::new("/etc").join("passwd"), PathBuf::from("/etc/passwd"));

pub fn with_file_name<S: AsRef<OsStr>>(&self, file_name: S) -> PathBuf[src]

Creates an owned PathBuf like self but with the given file name.

See PathBuf::set_file_name for more details.

Examples

use async_std::path::{Path, PathBuf};

let path = Path::new("/tmp/foo.txt");
assert_eq!(path.with_file_name("bar.txt"), PathBuf::from("/tmp/bar.txt"));

let path = Path::new("/tmp");
assert_eq!(path.with_file_name("var"), PathBuf::from("/var"));

pub fn with_extension<S: AsRef<OsStr>>(&self, extension: S) -> PathBuf[src]

Creates an owned PathBuf like self but with the given extension.

See PathBuf::set_extension for more details.

Examples

use async_std::path::{Path, PathBuf};

let path = Path::new("foo.rs");
assert_eq!(path.with_extension("txt"), PathBuf::from("foo.txt"));

Important traits for Components<'a>
pub fn components(&self) -> Components[src]

Produces an iterator over the Components of the path.

When parsing the path, there is a small amount of normalization:

  • Repeated separators are ignored, so a/b and a//b both have a and b as components.

  • Occurrences of . are normalized away, except if they are at the beginning of the path. For example, a/./b, a/b/, a/b/. and a/b all have a and b as components, but ./a/b starts with an additional CurDir component.

  • A trailing slash is normalized away, /a/b and /a/b/ are equivalent.

Note that no other normalization takes place; in particular, a/c and a/b/../c are distinct, to account for the possibility that b is a symbolic link (so its parent isn't a).

Examples

use async_std::path::{Path, Component};
use std::ffi::OsStr;

let mut components = Path::new("/tmp/foo.txt").components();

assert_eq!(components.next(), Some(Component::RootDir));
assert_eq!(components.next(), Some(Component::Normal(OsStr::new("tmp"))));
assert_eq!(components.next(), Some(Component::Normal(OsStr::new("foo.txt"))));
assert_eq!(components.next(), None)

Important traits for Iter<'a>
pub fn iter(&self) -> Iter[src]

Produces an iterator over the path's components viewed as OsStr slices.

For more information about the particulars of how the path is separated into components, see components.

Examples

use async_std::path::{self, Path};
use std::ffi::OsStr;

let mut it = Path::new("/tmp/foo.txt").iter();
assert_eq!(it.next(), Some(OsStr::new(&path::MAIN_SEPARATOR.to_string())));
assert_eq!(it.next(), Some(OsStr::new("tmp")));
assert_eq!(it.next(), Some(OsStr::new("foo.txt")));
assert_eq!(it.next(), None)

pub fn display(&self) -> Display[src]

Returns an object that implements Display for safely printing paths that may contain non-Unicode data.

Examples

use async_std::path::Path;

let path = Path::new("/tmp/foo.rs");

println!("{}", path.display());

pub async fn metadata<'_>(&'_ self) -> Result<Metadata>[src]

Queries the file system to get information about a file, directory, etc.

This function will traverse symbolic links to query information about the destination file.

This is an alias to fs::metadata.

Examples

use async_std::path::Path;

let path = Path::new("/Minas/tirith");
let metadata = path.metadata().await.expect("metadata call failed");
println!("{:?}", metadata.file_type());

Queries the metadata about a file without following symlinks.

This is an alias to fs::symlink_metadata.

Examples

use async_std::path::Path;

let path = Path::new("/Minas/tirith");
let metadata = path.symlink_metadata().await.expect("symlink_metadata call failed");
println!("{:?}", metadata.file_type());

pub async fn canonicalize<'_>(&'_ self) -> Result<PathBuf>[src]

Returns the canonical, absolute form of the path with all intermediate components normalized and symbolic links resolved.

This is an alias to fs::canonicalize.

Examples

use async_std::path::{Path, PathBuf};

let path = Path::new("/foo/test/../test/bar.rs");
assert_eq!(path.canonicalize().await.unwrap(), PathBuf::from("/foo/test/bar.rs"));

Reads a symbolic link, returning the file that the link points to.

This is an alias to fs::read_link.

Examples

use async_std::path::Path;

let path = Path::new("/laputa/sky_castle.rs");
let path_link = path.read_link().await.expect("read_link call failed");

pub async fn read_dir<'_>(&'_ self) -> Result<ReadDir>[src]

Returns an iterator over the entries within a directory.

The iterator will yield instances of io::Result<DirEntry>. New errors may be encountered after an iterator is initially constructed.

This is an alias to fs::read_dir.

Examples

use async_std::fs;
use async_std::path::Path;
use async_std::prelude::*;

let path = Path::new("/laputa");
let mut dir = fs::read_dir(&path).await.expect("read_dir call failed");
while let Some(res) = dir.next().await {
    let entry = res?;
    println!("{}", entry.file_name().to_string_lossy());
}

pub async fn exists<'_>(&'_ self) -> bool[src]

Returns true if the path points at an existing entity.

This function will traverse symbolic links to query information about the destination file. In case of broken symbolic links this will return false.

If you cannot access the directory containing the file, e.g., because of a permission error, this will return false.

Examples

use async_std::path::Path;
assert_eq!(Path::new("does_not_exist.txt").exists().await, false);

See Also

This is a convenience function that coerces errors to false. If you want to check errors, call fs::metadata.

pub async fn is_file<'_>(&'_ self) -> bool[src]

Returns true if the path exists on disk and is pointing at a regular file.

This function will traverse symbolic links to query information about the destination file. In case of broken symbolic links this will return false.

If you cannot access the directory containing the file, e.g., because of a permission error, this will return false.

Examples

use async_std::path::Path;
assert_eq!(Path::new("./is_a_directory/").is_file().await, false);
assert_eq!(Path::new("a_file.txt").is_file().await, true);

See Also

This is a convenience function that coerces errors to false. If you want to check errors, call fs::metadata and handle its Result. Then call fs::Metadata::is_file if it was Ok.

pub async fn is_dir<'_>(&'_ self) -> bool[src]

Returns true if the path exists on disk and is pointing at a directory.

This function will traverse symbolic links to query information about the destination file. In case of broken symbolic links this will return false.

If you cannot access the directory containing the file, e.g., because of a permission error, this will return false.

Examples

use async_std::path::Path;
assert_eq!(Path::new("./is_a_directory/").is_dir().await, true);
assert_eq!(Path::new("a_file.txt").is_dir().await, false);

See Also

This is a convenience function that coerces errors to false. If you want to check errors, call fs::metadata and handle its Result. Then call fs::Metadata::is_dir if it was Ok.

Trait Implementations

impl<P: AsRef<Path>> Extend<P> for PathBuf[src]

impl<'b, P: AsRef<Path> + 'b> FromStream<P> for PathBuf[src]

impl AsRef<Path> for PathBuf[src]

impl AsRef<Path> for PathBuf[src]

impl Into<PathBuf> for PathBuf[src]

impl From<PathBuf> for PathBuf[src]

impl From<OsString> for PathBuf[src]

impl<'_> From<&'_ str> for PathBuf[src]

impl Default for PathBuf[src]

impl PartialEq<PathBuf> for PathBuf[src]

impl Debug for PathBuf[src]

impl Deref for PathBuf[src]

type Target = Path

The resulting type after dereferencing.

impl StructuralPartialEq for PathBuf[src]

impl Borrow<Path> for PathBuf[src]

Auto Trait Implementations

impl Send for PathBuf

impl Sync for PathBuf

impl Unpin for PathBuf

impl UnwindSafe for PathBuf

impl RefUnwindSafe for PathBuf

Blanket Implementations

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> From<T> for T[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]