[−][src]Function fsio::file::modify_file
pub fn modify_file<T: AsPath + ?Sized>(
path: &T,
write_content: &dyn Fn(&mut File) -> Result<()>,
append: bool
) -> Result<(), FsIOError>
Overwrites or appends the requested file and triggers the provided write_content function to enable custom writing.
Arguments
path
- The file pathwrite_content
- The custom writing functionappend
- True to append false to overwrite
Example
extern crate fsio; 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"); }