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()?);

Implementations

impl FileWrite

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

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

pub 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.

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

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

pub fn open_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.

pub fn path(&self) -> &PathFile

pub 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.

pub 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.

pub 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.

pub 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.

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

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

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

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

Trait Implementations

impl AsRef<File> for FileWrite

fn as_ref(&self) -> &File

Performs the conversion.

impl AsRef<FileOpen> for FileWrite

fn as_ref(&self) -> &FileOpen

Performs the conversion.

impl Borrow<File> for FileWrite

fn borrow(&self) -> &File

Immutably borrows from an owned value.

impl<'a> Borrow<File> for &'a FileWrite

fn borrow(&self) -> &File

Immutably borrows from an owned value.

impl Borrow<FileOpen> for FileWrite

fn borrow(&self) -> &FileOpen

Immutably borrows from an owned value.

impl<'a> Borrow<FileOpen> for &'a FileWrite

fn borrow(&self) -> &FileOpen

Immutably borrows from an owned value.

impl Debug for FileWrite

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

Formats the value using the given formatter.

impl From<FileWrite> for FileOpen

fn from(orig: FileWrite) -> FileOpen

Performs the conversion.

impl Seek for FileWrite

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

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

pub fn stream_len(&mut self) -> Result<u64, Error>

🔬 This is a nightly-only experimental API. (seek_stream_len)

Returns the length of this stream (in bytes).

pub fn stream_position(&mut self) -> Result<u64, Error>

Returns the current seek position from the start of the stream.

impl Write for FileWrite

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

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

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

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

pub fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>

Like write, except that it writes from a slice of buffers.

pub fn is_write_vectored(&self) -> bool

🔬 This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

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

Attempts to write an entire buffer into this writer.

pub fn write_all_vectored(
    &mut self,
    bufs: &mut [IoSlice<'_>]
) -> Result<(), Error>

🔬 This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

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

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

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

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