Indego CSV parsing

indego.rs

use std::env;
use std::error::Error;
use std::process;

use csv::Reader;
use serde::Deserialize;

#[derive(Debug, Deserialize)]
enum PassholderType {
    Indego30,
    Indego365,
    IndegoFlex,
    #[serde(rename(deserialize = "Day Pass"))]
    DayPass,
}

#[derive(Debug, Deserialize)]
#[serde(rename_all = "lowercase")]
enum BikeType {
    Standard,
    Electric,
}

#[derive(Debug, Deserialize)]
struct Record {
    trip_id: u32,
    duration: u32,
    start_time: String,
    end_time: String,
    start_station: u32,
    start_lat: Option<f64>,
    start_lon: Option<f64>,
    end_station: u32,
    end_lat: Option<f64>,
    end_lon: Option<f64>,
    bike_id: u32,
    passholder_type: PassholderType,
    bike_type: BikeType,
}

fn load_records(path: String) -> Result<Vec<Record>, Box<dyn Error>> {
    Reader::from_path(path)?
       .deserialize()
       .collect::<Result<Vec<Record>, _ >>()
       .map_err(From::from)
}

fn main() {
    let path = env::args().nth(1).expect("no path given");

    match load_records(path) {
        Err(err) => {
            println!("error: {:?}", err);
            process::exit(1);
        }
        Ok(records) => {
            println!("got {:?} records", records.len());
        }
    }
}