Struct tempfile::Builder

pub struct Builder<'a, 'b> { /* fields omitted */ }

Create a new temporary file or directory with custom parameters.

Methods

impl<'a, 'b> Builder<'a, 'b>

pub fn new() -> Self

Create a new Builder.

Examples

Create a named temporary file and write some data into it:

use tempfile::Builder;

let named_tempfile = Builder::new()
    .prefix("my-temporary-note")
    .suffix(".txt")
    .rand_bytes(5)
    .tempfile()?;

let name = named_tempfile
    .path()
    .file_name().and_then(OsStr::to_str);

if let Some(name) = name {
    assert!(name.starts_with("my-temporary-note"));
    assert!(name.ends_with(".txt"));
    assert_eq!(name.len(), "my-temporary-note.txt".len() + 5);
}

Create a temporary directory and add a file to it:

use tempfile::Builder;

let dir = Builder::new()
    .prefix("my-temporary-dir")
    .rand_bytes(5)
    .tempdir()?;

let file_path = dir.path().join("my-temporary-note.txt");
let mut file = File::create(file_path)?;
writeln!(file, "Brian was here. Briefly.")?;

// By closing the `TempDir` explicitly, we can check that it has
// been deleted successfully. If we don't close it explicitly,
// the directory will still be deleted when `dir` goes out
// of scope, but we won't know whether deleting the directory
// succeeded.
drop(file);
dir.close()?;

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn prefix(&mut self, prefix: &'a str) -> &mut Self

Set a custom filename prefix.

Path separators are legal but not advisable. Default: .tmp.

Examples

let named_tempfile = Builder::new()
    .prefix("my-temporary-note")
    .tempfile()?;

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn suffix(&mut self, suffix: &'b str) -> &mut Self

Set a custom filename suffix.

Path separators are legal but not advisable. Default: empty.

Examples

let named_tempfile = Builder::new()
    .suffix(".txt")
    .tempfile()?;

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn rand_bytes(&mut self, rand: usize) -> &mut Self

Set the number of random bytes.

Default: 6.

Examples

let named_tempfile = Builder::new()
    .rand_bytes(5)
    .tempfile()?;

pub fn tempfile(&self) -> Result<NamedTempFile>

Create the named temporary file.

Security

See the security docs on NamedTempFile.

Resource leaking

See the resource leaking docs on NamedTempFile.

Errors

If the file cannot be created, Err is returned.

Examples

let tempfile = Builder::new().tempfile()?;

pub fn tempfile_in<P: AsRef<Path>>(&self, dir: P) -> Result<NamedTempFile>

Create the named temporary file in the specified directory.

Security

See the security docs on NamedTempFile.

Resource leaking

See the resource leaking docs on NamedTempFile.

Errors

If the file cannot be created, Err is returned.

Examples

let tempfile = Builder::new().tempfile_in("./")?;

pub fn tempdir(&self) -> Result<TempDir>

Attempts to make a temporary directory inside of env::temp_dir() whose name will have the prefix, prefix. The directory and everything inside it will be automatically deleted once the returned TempDir is destroyed.

Resource leaking

See the resource leaking docs on TempDir.

Errors

If the directory can not be created, Err is returned.

Examples

use std::fs::File;
use std::io::Write;
use tempfile::Builder;

let tmp_dir = Builder::new().tempdir()?;

pub fn tempdir_in<P: AsRef<Path>>(&self, dir: P) -> Result<TempDir>

Attempts to make a temporary directory inside of dir. The directory and everything inside it will be automatically deleted once the returned TempDir is destroyed.

Resource leaking

See the resource leaking docs on TempDir.

Errors

If the directory can not be created, Err is returned.

Examples

use std::fs::{self, File};
use std::io::Write;
use tempfile::Builder;

let tmp_dir = Builder::new().tempdir_in("./")?;

Trait Implementations

impl<'a, 'b> Debug for Builder<'a, 'b>

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

Formats the value using the given formatter.

impl<'a, 'b> Clone for Builder<'a, 'b>

fn clone(&self) -> Builder<'a, 'b>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a, 'b> Eq for Builder<'a, 'b>

impl<'a, 'b> PartialEq for Builder<'a, 'b>

fn eq(&self, other: &Builder<'a, 'b>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Builder<'a, 'b>) -> bool

This method tests for !=.

impl<'a, 'b> Default for Builder<'a, 'b>

fn default() -> Self

Returns the "default value" for a type.