copy a csv file in rust

To copy a CSV file in Rust, you can use the fs and io modules from the standard library, as well as the csv crate for parsing and writing CSV files. Here's an example code:


main.rs
use std::fs;
use std::io::{self, BufRead, BufReader, BufWriter};
use csv::WriterBuilder;

fn copy_csv_file(source_path: &str, target_path: &str) -> io::Result<()> {
    // open the source file for reading and target file for writing
    let source_file = fs::File::open(source_path)?;
    let target_file = fs::File::create(target_path)?;
    
    // create readers and writers
    let source_reader = BufReader::new(source_file);
    let target_writer = BufWriter::new(target_file);
    let mut writer = WriterBuilder::new().from_writer(target_writer);
    
    // copy each row from source to target
    for line in source_reader.lines() {
        let row = line?;
        writer.write_record(&csv::ReaderBuilder::new()
            .has_headers(false)
            .from_reader(row.as_bytes())
            .records()
            .next()
            .unwrap()?)?;
    }
    
    writer.flush()?;
    Ok(())
}

fn main() {
    let source_path = "source.csv";
    let target_path = "target.csv";
    
    match copy_csv_file(source_path, target_path) {
        Ok(()) => println!("File copied successfully."),
        Err(e) => println!("Error copying file: {:?}", e),
    }
}
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In this code, we first open the source and target files with the fs module, and create readers and writers with the io module. Then we loop through each line of the source file with a for loop and write each row to the target file using a csv::Writer from the csv crate. We also use the csv::Reader to parse each row from a string slice to a CSV record.

Note that this code assumes that the CSV file has no header row, so we set the has_headers option to false when creating the csv::Reader. If the file has a header, you can set this option to true and write the header to the target file separately.

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