Function fsio::file::modify_file

pub fn modify_file<T: AsPath + ?Sized>(
    path: &T,
    write_content: &dyn Fn(&mut File) -> Result<()>,
    append: bool
) -> FsIOResult<()>

Overwrites or appends the requested file and triggers the provided write_content function to enable custom writing.

Arguments

• path - The file path
• write_content - The custom writing function
• append - True to append false to overwrite

Example

use crate::fsio::file;
use std::fs::File;
use std::io::Write;
use std::str;

fn main() {
    let file_path = "./target/__test/file_test/modify_file/file.txt";
    let mut result = file::modify_file(
        file_path,
        &move |file: &mut File| file.write_all("some content".as_bytes()),
        false,
    );
    assert!(result.is_ok());
    result = file::modify_file(
        file_path,
        &move |file: &mut File| file.write_all("\nmore content".as_bytes()),
        true,
    );
    assert!(result.is_ok());

    let data = file::read_file(file_path).unwrap();

    assert_eq!(str::from_utf8(&data).unwrap(), "some content\nmore content");
}