StagedFile

StagedFile 帮助将数据写入临时文件，并提供将临时文件提交到所需最终文件路径的选项。

如果所需最终文件路径存在文件，则提交函数调用期间将覆盖该文件。

目前仅支持 UNIX。

安装

[dependencies]
staged_file = "0.5.0"

示例

use staged_file::StagedFile;
use std::fs::File;
use std::io::{prelude::*, LineWriter};
use std::path::Path;

let final_path = Path::new("/a/file/path");
let staged_file = StagedFile::with_final_path(&final_path)?;

let text = b"Hello World!";

{
    // The LineWriter code is in a block so that `&staged_file` is not considered
    // borrowed at the end of the block. Another way to get back the
    // `staged_file` is to call `line_writer.into_inner()`.
    let mut line_writer = LineWriter::new(&staged_file);
    line_writer.write_all(text)?;
    line_writer.flush()?;
}

staged_file.commit()?;

assert_eq!(std::fs::read(final_path)?, text);

如果没有调用 commit() 方法，则暂存文件内容将被丢弃。