Struct path_abs::FileWrite

pub struct FileWrite(_);

A write-only file handle with path() attached and improved error messages. Contains only the methods and trait implementations which are allowed by a write-only file.

Examples

use std::io::Write;
use path_abs::{PathFile, FileWrite};

let example = "example.txt";

let expected = "foo\nbar";
let mut write = FileWrite::create(example)?;
write.write_all(expected.as_bytes())?;
write.flush();

let file = PathFile::new(example)?;
assert_eq!(expected, file.read_string()?);

Methods

impl FileWrite

fn open<P: AsRef<Path>>(path: P, options: OpenOptions) -> Result<FileWrite>

Open the file with the given OpenOptions but always sets write to true.

fn create<P: AsRef<Path>>(path: P) -> Result<FileWrite>

Open the file in write-only mode, truncating it first if it exists and creating it otherwise.

fn append<P: AsRef<Path>>(path: P) -> Result<FileWrite>

Open the file for appending, creating it if it doesn't exist.

fn edit<P: AsRef<Path>>(path: P) -> Result<FileWrite>

Open the file for editing (reading and writing) but do not create it if it doesn't exist.

fn sync_all(&self) -> Result<()>

Attempts to sync all OS-internal metadata to disk.

This function will attempt to ensure that all in-core data reaches the filesystem before returning.

This function is identical to std::fs::File::sync_all except it has error messages which include the action and the path.

fn sync_data(&self) -> Result<()>

This function is similar to sync_all, except that it may not synchronize file metadata to the filesystem.

This function is identical to std::fs::File::sync_data except it has error messages which include the action and the path.

fn set_len(&mut self, size: u64) -> Result<()>

Truncates or extends the underlying file, updating the size of this file to become size.

This function is identical to std::fs::File::set_len except:

• It has error messages which include the action and the path.
• It takes &mut self instead of &self.

fn set_permissions(&mut self, perm: Permissions) -> Result<()>

Changes the permissions on the underlying file.

This function is identical to std::fs::File::set_permissions except:

• It has error messages which include the action and the path.
• It takes &mut self instead of &self.

fn write_str(&mut self, s: &str) -> Result<()>

Shortcut to self.write_all(s.as_bytes()) with slightly improved error message.

fn flush(&mut self) -> Result<()>

std::io::File::flush buth with the new error type.

Methods from Deref<Target = FileOpen>

fn path(&self) -> &PathFile

Get the path associated with the open file.

fn metadata(&self) -> Result<Metadata>

Queries metadata about the underlying file.

This function is identical to std::fs::File::metadata except it has error messages which include the action and the path.

fn try_clone(&self) -> Result<FileOpen>

Creates a new independently owned handle to the underlying file.

This function is identical to std::fs::File::try_clone except it has error messages which include the action and the path and it returns a FileOpen object.

Trait Implementations

impl Debug for FileWrite

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Write for FileWrite

fn write(&mut self, buf: &[u8]) -> Result<usize>

Write a buffer into this object, returning how many bytes were written.

fn flush(&mut self) -> Result<()>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this write.

fn write_fmt(&mut self, fmt: Arguments) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

Creates a "by reference" adaptor for this instance of Write.

impl Seek for FileWrite

fn seek(&mut self, pos: SeekFrom) -> Result<u64>

Seek to an offset, in bytes, in a stream.

impl Deref for FileWrite

type Target = FileOpen

The resulting type after dereferencing.

fn deref(&self) -> &FileOpen

Dereferences the value.