29 lines
802 B
Rust
29 lines
802 B
Rust
use std::{env, error::Error, ffi::OsString, fs::File, process};
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fn run() -> Result<(), Box<dyn Error>> {
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let file_path = get_first_arg()?;
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let file = File::open(file_path)?;
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let mut rdr = csv::Reader::from_reader(file);
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for result in rdr.records() {
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let record = result?;
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println!("{:?}", record);
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}
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Ok(())
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}
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/// Returns the first positional argument sent to this process. If there are no
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/// positional arguments, then this returns an error.
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fn get_first_arg() -> Result<OsString, Box<dyn Error>> {
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match env::args_os().nth(1) {
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None => Err(From::from("expected 1 argument, but got none")),
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Some(file_path) => Ok(file_path),
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}
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}
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fn main() {
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if let Err(err) = run() {
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println!("{}", err);
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process::exit(1);
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}
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}
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