Struct path_abs::FileEdit

pub struct FileEdit(_);

A read/write file handle with path() attached and improved error messages. Contains methods and trait implements for both readable and writeable files.

Examples

use std::io::{Read, Seek, Write, SeekFrom};
use path_abs::FileEdit;

let example = "example.txt";

let expected = "foo\nbar";
let mut edit = FileEdit::create(example)?;

let mut s = String::new();
edit.write_all(expected.as_bytes())?;
edit.seek(SeekFrom::Start(0))?;
edit.read_to_string(&mut s)?;

assert_eq!(expected, s);

Implementations

impl FileEdit

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

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

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

Open the file in editing mode, truncating it first if it exists and creating it otherwise.

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

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

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

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

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 read_string(&mut self) -> Result<String>

Read what remains of the file to a String.

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 FileEdit

fn as_ref(&self) -> &File

Performs the conversion.

impl AsRef<FileOpen> for FileEdit

fn as_ref(&self) -> &FileOpen

Performs the conversion.

impl Borrow<File> for FileEdit

fn borrow(&self) -> &File

Immutably borrows from an owned value.

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

fn borrow(&self) -> &File

Immutably borrows from an owned value.

impl Borrow<FileOpen> for FileEdit

fn borrow(&self) -> &FileOpen

Immutably borrows from an owned value.

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

fn borrow(&self) -> &FileOpen

Immutably borrows from an owned value.

impl Debug for FileEdit

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

Formats the value using the given formatter.

impl From<FileEdit> for FileOpen

fn from(orig: FileEdit) -> FileOpen

Performs the conversion.

impl Read for FileEdit

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

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

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

Like read, except that it reads into a slice of buffers.

pub fn is_read_vectored(&self) -> bool

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

Determines if this Reader has an efficient read_vectored implementation.

pub unsafe fn initializer(&self) -> Initializer

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

Determines if this Reader can work with buffers of uninitialized memory.

pub fn read_to_end(&mut self, buf: &mut Vec<u8, Global>) -> Result<usize, Error>

Read all bytes until EOF in this source, placing them into buf.

pub fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>

Read all bytes until EOF in this source, appending them to buf.

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

Read the exact number of bytes required to fill buf.

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

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

pub fn bytes(self) -> Bytes<Self>

Transforms this Read instance to an Iterator over its bytes.

pub fn chain<R>(self, next: R) -> Chain<Self, R> where
    R: Read, 

Creates an adaptor which will chain this stream with another.

pub fn take(self, limit: u64) -> Take<Self>

Creates an adaptor which will read at most limit bytes from it.

impl Seek for FileEdit

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 FileEdit

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.