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// From: https://doc.rust-lang.org/rust-by-example/std_misc/file/read_lines.html | |
use std::fs::File; | |
use std::io::{self, BufRead}; | |
use std::path::Path; | |
fn main() { | |
// File hosts.txt must exist in the current path | |
if let Ok(lines) = read_lines("./hosts.txt") { | |
// Consumes the iterator, returns an (Optional) String | |
for line in lines.flatten() { | |
println!("{}", line); | |
} | |
} | |
} | |
// The output is wrapped in a Result to allow matching on errors. | |
// Returns an Iterator to the Reader of the lines of the file. | |
fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>> | |
where | |
P: AsRef<Path>, | |
{ | |
let file = File::open(filename)?; | |
Ok(io::BufReader::new(file).lines()) | |
} |
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