32 lines
838 B
Rust
32 lines
838 B
Rust
use std::env;
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use std::fs::File;
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use std::io::{self, BufRead};
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use std::path::Path;
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fn main() {
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let args: Vec<String> = env::args().collect();
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let filename = parse_config(&args);
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if let Ok(lines) = read_lines(Path::new(filename)) {
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// Consumes the iterator, returns an (Optional) String
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for line in lines {
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if let Ok(ip) = line {
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println!("{}", ip);
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}
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}
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}
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}
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fn parse_config(args: &[String]) -> &str {
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let filename = &args[1];
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filename
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}
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// The output is wrapped in a Result to allow matching on errors
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// Returns an Iterator to the Reader of the lines of the file.
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fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
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where P: AsRef<Path>, {
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let file = File::open(filename)?;
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Ok(io::BufReader::new(file).lines())
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}
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