Commit 9a8a68b3 authored by David's avatar David
Browse files

I wrote a buffered read!

parent 89b9067f
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......@@ -7,3 +7,4 @@ edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
structopt = "0.2.10"
\ No newline at end of file
use structopt::StructOpt;
use std::fs::File;
use std::io::BufReader;
use std::io::prelude::*;
#[derive(StructOpt)]
struct Cli {
/// the pattern to look for
pattern: String,
/// The path to the file to read
#[structopt(parse(from_os_str))]
path: std::path::PathBuf,
}
fn main() {
println!("Hello, world!");
let args = Cli::from_args();
println!("DEBUG: pattern {}", args.pattern);
println!("DEBUG: path: {}", args.path.to_str().unwrap());
//Buffered reading!
buffered_reading(&args);
}
fn buffered_reading(cli: &Cli) {
let f = File::open(&cli.path).unwrap();
let mut reader = BufReader::new(f);
let mut line = String::new();
loop {
match reader.read_line(&mut line) {
Ok(0) => {
// end of file
break
}
Ok(_) => {
if line.contains(&cli.pattern) {
println!("{}", line);
}
line.clear(); //Have to clear the line myself each time, because mutable buffer
},
Err(e) => {
eprintln!("error received, should quit, {:?}", e);
break
}
}
}
}
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