41 lines
1.3 KiB
Rust
41 lines
1.3 KiB
Rust
use std::env;
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use std::fs::File;
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use std::io::prelude::*;
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use std::io::BufReader;
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use std::path::Path;
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fn main() -> std::io::Result<()> {
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let args: Vec<String> = env::args().collect();
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let mut only_chars = false;
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let mut only_lines = false;
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Ok(for arg in 1..args.len() {
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match args[arg].as_str() {
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"-c" => only_chars = true,
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"-l" => only_lines = true,
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"--help" => {
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println!("Usage: cat [OPTIONS] FILE");
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println!("Reads a file");
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}
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arg => {
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if Path::new(arg).exists() {
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let file = File::open(arg)?;
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let mut buf_reader = BufReader::new(file);
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let mut contents = String::new();
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buf_reader.read_to_string(&mut contents)?;
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let mut lines = 0;
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for _ in contents.lines() {
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lines += 1;
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}
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if only_chars {
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println!("{}", contents.len());
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} else if only_lines {
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println!("{}", lines);
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} else {
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println!("{} {} {}", lines, contents.len(), arg);
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}
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}
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}
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}
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})
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}
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